chemical physics of discharges - Argonne National Laboratory

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Deposition Utilizing Altcrnating Current 1s2 PRIAIXRT \'XRI;\DI,E COXSIDERATIONS Irydrogcn and boron trihronude vapors iverc used to obt:iin a co:iting of boron on 1-niil tungsten irirc in a corona dcvelopctl ivith (X)-c.ps alternating currcnt. It \vw determined th;it, at about 70 and 350 mA/cni2, no coating is ol,t:lined irhen the cell (and reactants) are at room tcniperature, \rhilc a co:iting of boron is obtnincd if the temperature is raiscd to approximately 100" C. At highcr currcnt densities, the coating is concentrated in nodules. If enough power is supplied to heat the filament to a dull red glow, :I good coating is obtained in the hot zone, At lower current densities, a more uniform coating is obtained, depending upon the reactant ratios and flow rates. Thus, hydrogen was bubbled through boron tribromide at a rate of approximately 400 ml/min, and the system \viis maintained at approximately atmospheric pressure. When the boron tribromide \vas maintained at about room temperuture and at a total hydrogen flow rate of about, 1.5 liter/min, thc corona was discontinuous along the wire and boron deposited in the area of the coronas to give discrete coated and uncoated areas. With a hydrogen flow rate of about 400 ml/min and a plating time of about 10 min, a much smoother coating was obtained. There was some tendency for the corona to break into discontinuous sections, which resulted in a nonuniform buildup of boron. When the boron tribromide was heated to about 30" C and the hydrogen flow rate was maintained at 400 ml/min, the corona was somewhat more continuous and the coating nearly uniform. However, the coating was not nearly as smooth as in the previous example. There was also a tendency for the formation of corona points on the opposing electrode system with a resulting deposition of boron under the corona. Deposition Utilizing Direct Current Using hydrogen and boron tribromide as reactants to obtain a deposit of boron on 1-mil tungsten wire in a corona developed with half-wave rectified 60-cps alternating current, no deposit was obtained when the 1-mil wire was the anode. However, a coating was obtnincd when the 1-mil wire was the cathode. Good, continuous corona and boron deposits were obtained when the corona was initiated in a large excess of hydrogen (the hydrogen flow was then decreased to the desired amount after about 5 min). The coating is quite uniform and has an orange peel appearance at 2,OOOX magnification. Some of the morphology of the substrate is apparent at high magnification (e.g., die marks). The voltage requirements for a particular current increased as the hydrogen flow decreased, increasing from more than 1,000 V peak to about 7,000 V peak as the excess hydrogen was decreased in these runs. Attempts to utilize pure de power were unsuccessful. The power supplies available were designed to deliver several hundred milliamperes and had relatively coarse controls. Thus, as the corona was initiated, the power supplies did not allow sufficient control, resulting in "runaway" or burning in two of the substrate wire. Deposition Utilizing Argon and Helium Using helium instead of hydrogen, a coating was obtained, but arcing was much easier and thus lower current (and lower flow rates) were necessary. Peak voltages of 7,000 to 8,000 v were used. Using argon instead of hydrogen required higher voltage (with lower currents) and resulted in the formation of corona points under which boron was deposited to give whiskers. Peak voltages of about 9,000 V were used. Whiskers greater than 6 mils long and about 0.5 mil in diameter were obtained before discontinuing these experiments. I .1 I!
I i , \ I i & a - P Fig. 3 Reaction Cell Used for Plating in a Corona Discharge Fig. 4 Boron Deposit on 1-mil Tungsten Wire, Run 28-1, Tungsten Substrate Material at Top (340x) Fig. 5 Boron Deposit on 0.5-mil Tungsten Wire, RLUI 35-1 (450X)
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)i 1 reesonably complete and accura
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3 inquire about the component of ve
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4 I I 5 To find (t2)av, we assume t
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\ vnich, it is noted can be negativ
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I 7 than or smaller than the second
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i I i I I I ) ) i L , I I . INT1:OD
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13 field per electron is and per co
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. 11. 5. CharRe-Transfer and Ion-Mo
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17 In the followin:: sections much
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above. With that EIN, an estimate o
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21 region in w!iich large, nighlv l
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i ’ understanding: 23 (a) Electro
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Obviously, the secondary ion must h
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27 (22) Franklin, J. L., Munson, M.
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Tables 1-6 present examples of rela
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Table 8 Some Ions Formed by Process
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33 velocity of the reacting partn r
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35 must be added to the Langevin cr
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37 In our laboratory a microwave di
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+ . 4 . r 39 as well as N in a cor0
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ION-MOIECULE REACTION RATES MEASUFI
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43 excitntion 2onditions so that th
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45 In 2 like manner Fig. 3, showing
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47 Absorption Spectra of Transient
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50 maximum fiela. In this manner, a
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52 3 % %- %- 5- a- 7 h W P H 0 L v)
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References I I . A.B.Callear, J.A.G
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._ . _-.. - , , . . ,. . The Pyrex
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58 0 0 0 VI J > I cv . u H a
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.... . 0 2 e I / m 0 H F4 : 1
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\ 0.9 0.8 0.7 06 0.5 0.4 0.3 0.2 01
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65 ' cause of the reduction in the
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INTRODUCTION I' Attachment of polar
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I 69 EXPERIMENTAL The mass spectrom
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+ Figure 1 Mixed water and methanol
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73 ' , radius might be expected bec
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75 Negative Ion Mass Spectra of Som
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A b 1 1 I H I I I FILAMEN T CONTINU
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79 for positive and negative ions,
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51 out to answer some of the questi
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93 INTERACTIONS OF EXCITED SPECIES
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L 4 I*C z 0'2 = a, a U x I m 4 m 0
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I L I, ; > > E Fig. 3 I50 200 150 1
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I 300 r 1 - 200 i io ;' a cn I I. 0
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where DISCUSSION OF XESULTS PERTAIN
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93 where the bar indicates values c
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'I i 'I 0 2. 4 6 8 2 [ N]* x' I 0-2
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Fig. 14 IO 8 6 4F [NO] x IO-" (mole
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for chemiluminescent excitation in
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101 Chemiluminescent Reactions of E
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103 All gases were taken directly f
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10; He: + N2 -. 2He + h': (8) whi!?
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description for both diffusion and
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B. Ions and Electrons I Consider a
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' 112 axial diffusion through the d
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the tube walls occurs continuously
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E2R M ' $6"
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1. 2. 3. 4. 5. 6. 7. 8. 9- 10. u. -
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120 . Dlschorge zone Reactor zone 1
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122 In radiation chemistry the cust
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124 4. chemistry seem limited essen
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126 Conversion of Mixtures into Mor
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Hydrazine Synthesis in A Silent dle
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{;I . - . .. . - .., . . .. _- .. .
Page 132 and 133: 1 \ \ \ , \ , \ \ Pmer hnrity K.W.
Page 134 and 135: . I operating fact that the sloGe i
Page 136 and 137: _- of ' . 8. - 7 6, Residence Time
Page 138 and 139: 135 Ionic Reactions in Corona Disch
Page 140 and 141: GAS OUT GAS IN i.ho QUADRUPOLE MASS
Page 142 and 143: - + ( ~ ~ + 0 H ) ~ O ~ ( H~o)~H+ +
Page 144 and 145: 144 i I , , , , . + 1- u 3c w Inu c
Page 146 and 147: 146 SYNTHESIS OF ORGANIC COIGhTDS B
Page 148 and 149: mi5 a- dz CI n I a I n +4 - 0 -I- k
Page 150 and 151: 0 z cu I I I
Page 152: I- I - t d m a .rl Y x c, t-' d k
Page 155 and 156: , 155 This result is significant in
Page 157 and 158: Compound Bond he rgy Li I 82 UBr 10
Page 159 and 160: , ”..’ 3or 25 - 5 20 - s 3 w Y
Page 161 and 162: I 161 THE GLOW DISCHARGE DEPOSITION
Page 163 and 164: Fig. 1 Process Apparatus -__l.ll__
Page 165 and 166: v) t- at- InIo Io0 t-Q) loo lcua O
Page 167 and 168: This study is only an approximation
Page 169 and 170: Mole Reaction Material ratio time e
Page 171 and 172: \ i (4) Effect of System Pressure T
Page 173 and 174: 173 Pressure. Since pressure is a c
Page 175 and 176: 175 Table VI X-RAY DATA OF DEPOSIT
Page 177 and 178: 177 Another source of weakness is t
Page 179 and 180: 179 PLATING IN A CORONA DISCHARGE R
Page 181: \ 3 , ,\ 110 v 60 CPS MANOMETER . F
Page 185 and 186: \ \' C 0 .d * d .- C U d 0) c( 1) L
Page 187 and 188: I i I . Q) I, s w 0 v) Y 0 a w W a
Page 189 and 190: I (b) Polarized Light Fig. 6 Cross
Page 191 and 192: i m v) Y C i! u o) 23 a a- + 191 m
Page 193 and 194: i, d C .d c c W Q ) 0 0 L1Y 0 000 0
Page 195 and 196: i e 4 0 wcr -4 4 al 0 0 0 c) cr 13:
Page 197 and 198: \ E ‘ 1 TIME FOR RUN 13-1 14-1 -
Page 199 and 200: 199 a red heat in this cell using d
Page 201 and 202: \ , t j \ I, v) 2 Y . C 0 u m .I C
Page 203 and 204: 203 VAPOR PHASE FORMATION OF NONCRY
Page 205 and 206: BELL JAR STANC TO VACUUM SYSTEM U T
Page 207 and 208: 207 of the boron oxide film, the fi
Page 209 and 210: i I, 4 I.( Y I- * 0 i f i 3 0.t I I
Page 211 and 212: 211 The Reacticn 3f Oxygen with Car
Page 213 and 214: 2 E, W t- a Z 9 I- a 2 X 0 I50 too
Page 215 and 216: 'i' 100 50 IC 21 5 2.0 2.5 SURFACE
Page 217 and 218: I- z W 0 w a a 100 80 60 40 20 215
Page 219 and 220: s., Literature Cited Berkley, C. ,
Page 221 and 222: 7 h \ F 221 600°C and 1 atmosphere
Page 223 and 224: 223 e I'
Page 225 and 226: R L ' -1 9mm O.D. 5mm I.D. 45mm 0.D
Page 227 and 228: Figure 5.- Paschen's law curves. 2-
Page 229 and 230: \ '? I The water-free product gases
Page 231 and 232: N I + 0" ON i I + 0 u / 0 0 I 0 cu
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- 233 SOME PROBLEMS OF THE KINETICS
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.. . :. ,. .I , . i ? .. . , ... .
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237 Table 2 Experimental Variables
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239 Zhbie I Eerccnt Consumption of
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241 Discussion The systematic varia
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I \ 1 243 FORMATION OF HYDROCARBONS
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h z - a o m a 20 T IME, minutes . F
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I 1 I I I I 0 I 2 3 4 5 TIME, minut
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The next five coluws in table 1 sho
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\ .\ t 251 Given the existence of t
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I L 253 Epple, R. P. and C. M. Apt.
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1 ' Fig. 1 Schematic of flow discha
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5' . ' I 1 257 co, with excess H2,
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1 1 1 moo 1400 1300 c V' I IPOO I I
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i 25i The Dlssocfatior of ToIuere V
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L ! , c PRODUCTS FROM A 28 MC. DISC
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'\ J ?. , .. . : PRODUCT FORMATION
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'9 / I '\ "1 BENZYL CATION AND RADI
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a
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271 tube serve? as the high voltare
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273 ion (1L.). Zxcitei-ion by colli
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Apparatus and Procedure 275 EXPERIM
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. 277 6. A freshly prepared sam le
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observed. The polystyrene (10% solu
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i i (12) c (11) (14) I 281 LITERATU
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FLOW- METER I ADDITIVE SUPPLY * ,28
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285 TABLE 2 Effect of Haloqenated A
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ANALYTICAL RESULTS Some evidence wa
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DISCUSSION 289 The salient features
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? ~ MENBERSHIP IN THE DIVISION OF F
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292 flow of the reactant gas stream
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294 have suitable residence times i
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0 E < h( E l! d K c 0 .- Y 0 t u t
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298 yields of many chemical product
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- ;i Y . 15. Pressure lOmm 5 > 10-
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302 the best and in many practical
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GENERATION AND MEASUREMENT OF AUDIO
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. The transformer secondary and the
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Vaccum-Tube Amplifier The mobile co
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310 f = Power supply frequency in c
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FUFARCI! INSTITUTE OF TFYDLC UNIVER
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J # I / 4) I . . '8 r4 0 r( P
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317 i Cuencb svsten w.nnar;itus use
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epcrte? the noss~kil.itv of nroduct
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1' b t +
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323 ....... - . . . . . . . . . . .
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1 \ i I i , / / / 8 3 1 325 To205 +
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- .- - - . - - . . . - . 327 n + c
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' POWER PLASMA GAS l e , ' I ! I I
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331 f'ENI?AL PF'FCLCCFC Dernis, P.R
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i J 333 ; mosphere (as opposed to a
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; it raised the question, still &?z
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p .I V I .= - - HCN/C(CALC. WITH C
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1 1 339 atmospheric ressure and ach
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RESULTS 341 Composition Dependence
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0.09 0.08 0.07 9 0.06 2 U - .$ 0.05
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II \ to the Slot So that less of th
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i 4 2 HYDROCARBON-NITROGEN REACTION
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I 1 349 c M m ; a e, k M x
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1.0 I - a. I n TEMPERATURE - OK Fig
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353 the experimental results in the
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,) 355 The ceaswed conversion cf ni
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1 6 357 Freezing. 3jpotnesise thzf
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359 \ Frozen Compositior: Calcillat
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I 1 \ 361 -. ne reaction proceecis
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\ 36 3 ' h, I 26. H. Purnell, Gas C
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In experiments on the direct conver
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367 used as blnders, with different
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369 ' i 1. REFERENCES Berber, John
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Distribution and yield rates of pro
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. . I . I 370 . . . . ., . . .. . .
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4 372 090- > E w - m c N O - 0 z :
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A-Feed tank 6-Thermocracker GReceiv
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80 \ 0 70 60 e 40 a U VI 9 30 20 10
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COAL DEASH& AND HIGH-PURITY COKE Wa
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3Pn _. -. - L -J:,J.-;~~~L, ):as se
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S ~ l ~ o n~pg:ading r is the resul
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The range ~f temperatures and gener
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. .. 386 9 * - r. Y 2 .' d a f' r.
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.) .L m 388 I
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TABLE 4 390 DELAYED COKING OF DEASH
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, ! I- on '---
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394 The present method is to keep t
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396 ‘c erperature, while the pres
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2, '! ! Proximate Analysis, wt $ Mo
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0 IS 0 14 LL 9 013 e \ 3 b- m *- 01
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402 HYDROGEN CYANIDE PRODUCED FROM
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404 Before startup, the system is p
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4 OL. ' , I. . TesCs. With.Coals .o
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Table 3.- Product Gas Analyses and
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410 BIBLIOGRAPHY 1. American Public
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Figure 2. Enclosure surrounding hyd
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0 0 f v) C 0 u m I z 2 c 2 r d J w
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0. E c .4 7 .. .c . I ( - Low tempe
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418 cual. A mjor aa\;antage or' the
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420 Ir ?Y ? ? 9 9 9 pc rod n o c o
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422 Table 3. Room-texperature M'dss
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424 state, depending on the strengt
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Table 4. Room-?;ergerature isomer s
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I' 1.3 . /o 9 IO 9 6 a 425 F F 33 I
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Brooks J.D. and Sternhell S. (1957)
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(52) Gib3 T.C. and Greenwood N.N. (
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434 transducer vas then introduced
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436 yield is quite similar. The con
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?-!??? 0 mv, Uh\OhIe . . . . eirlrl
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4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 4
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442 CHEMICAL REACTIONS IN A CORONA
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helium 444 CORONA REACTOR SYSTEM Fi
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446 The ultraviolet spectrum. for t
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Biphenyl Fraction 448 The low molec
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LUd The actual structural definitio
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I I I I I In m 9 In 2 , I: r- In m
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’. 454 Mechanism I The available
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456 , , . The relatively low yield
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458 h/lethylacetylene, allene and b
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Introduction VAPOR PHASE DECOMPOSIT
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462 more efficient hydrogenation. T
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464 place in parallel with fragment
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466 P rl 0, k 7 rnI rn al k a I hl
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458 TABLE I. COMPOSI'IION OF GASEOU
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REFERENCES 1. C. Hirayama and D. A.
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i 472 Reciprocal Arc Enthalpy ,-> F
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474 be pumped down without altering
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476 Instead a hydrogen deficient fi
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i 478
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480 FATTY ACIDS AND n-ALKANES IN GR
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482 TA5L,E 2. - Carbon number distr
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6. 7. a. 9. 484 Lawlor, D. L., and
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' I ' Sample No. 6 ' 12 IO 8 6 z 4
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. 488 uiolecular weight of which ca
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Xississippi (Sample GS). Stock solu
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492 found at 5.7 and 4.9& for the W
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494 mechanisms. However, the voltad
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For pure polynuclcar arom.i;ic hydr
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- '-'. . ' . . values are listed in
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500 (1;) Ten, T. 17.: a;1d,Dic;
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- ~ Resistivity Czlculation 2: 1 j:
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504 o ' C 0s 2 0 v x i 8 2 0 ! P -
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506 i
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d 601 L P LL
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I I I I I I I I m W N W N 0 (D ? 0
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514 was heated under nitrogen in a
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The line broadening at 79OK of the
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13. 14. 15. 16. 17. 18. 19. 20. 21.
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W L, Z 6 m (1: 0 6 d j o 2 ' 1 0.0
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Coals 522 Studies of the 1600 cm-l
Page 528 and 529:
L in ole i c a c id - 0' Two sample
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526 Table 1.- Ultimate analyses of
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528 6. Friedel, R. A., and H. Retco
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egeneration. The system can be seen
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532 and can be expressed in terms o
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534 in the vapor increases with inc
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NH3 NH3 NH3 NH3 Pyridine Pyridine P
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Mole Ratio of Test No. Quinoline to
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IXPROFJCTION D; M. Mason Institute
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-4:c~rciiny to recent studies o ;i4
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544 Table 1. LIGHT EMISSION OF Y"TR
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emission in a few cases may be by d
Page 552 and 553:
LITERATUR2 CITED i. C. -. .' * il.
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co, CH,,OR 1 - OTHER ADDITIVE FRITT
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FRIT 'TED CO, CH,.OR 4 ___ OTHER AD
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340 350 300 400 4 50 500 600 700 80
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0 554 WITH COOLING (PLATE AT 40°C)
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5 56 then t = to when e = 0 2) the
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5 58 The surface heat transfer coef
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Discussion and Results 560 Three br
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__- ._ 562 Table I THERMAL AND PHYS
Page 570:
ln 4 I 0 4J v \ 1.0 0.8 0.6 L - 0.4
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