Wüest M. 51 Wykes M. 82 Yamaguchi M. 17 Ybarra G. 129 Yubero F ...

More documents

Recommendations

Info

JUNE 28 WEDNESDAY AFTERNOON JS2-WeA-P.2 SYNTHESIS AND CHARACTERIZATION OF THIN HARD COAT- INGS OF CHROMIUM CARBIDES. L. Aissani. Département de Physique, Centre universitaire de Khenchela, Algérie. C. Harkati, and R. Halimi. Laboratoire Couches Minces et Interfaces, Département de Physique, Faculté des Sciences, Université Mentouri, 25000 Constantine, Algérie. Hard chromium carbide coatings were elaborated by depositing a chromium layer ( 3μm or 1 μm thickness ), using the physical vapour deposition technique of magnetron sputtering, on carbon steel substrates and, subsequently, annealing the system in vacuum at temperatures from 200°C to 1200°C. Structural characterization was assessed using scanning electron microscopy and X-ray diffraction. Some mechanical properties such as micro and nano-hardness and residual stresses were studied. It was found that the binary carbides Cr 7 C 3 , and Cr 23 C 6 appear at 700°C and 900°C respectively. The Cr 7 C 3 compound transforms then at 1000°C into ternary carbide (Cr,Fe) 7 C 3 . It was showed that the micro and nano-hardness increase with the rising of annealing temperature until reaching a maximum value and then decreases. The increase of the hardness is associated to the chromium carbides formation, which are harder. However, its decrease is due to the iron atoms diffusion into the coating layer. Thicker Chromium coatings present a better adhesive properties. It is, also, observed that the compressive residual stresses in coating (σ ϕ = -734 MPa at 900°C) become tensile at 1000°C (σ ϕ = 127 MPa). Keywords: Chromium, coating, carbides, thin films Presenting author: L. AISSANI E-mail: lindaaissani2004@yahoo.fr Presentation type: Poster 134
JUNE 28 WEDNESDAY AFTERNOON JS2-WeA-P.1 IMPROVEMENT OF MECHANICAL PROPERTIES OF STEEL SUBSTRATES SURFACE BY DEPOSITION OF THIN TITANIUM FILMS OBTAINED BY MAGNETRON SPUTTERING METHOD. R. Gheriani. Physical laboratory of Materials, University of Ouargla , 30.000- Algeria. R. Halimi. Unity of research, Materials and applications, University of Constantine, 25.000 – Algeria. Titanium carbides are well known materials with great scientific and technological interest. The applications of these materials take advantage of the fact that they are very hard, refractory and that they have metallic properties. In this work, We have studied the influence of the heat treatment temperatures ( 400-1000°C) on the interaction between the titanium thin films and steel substrates. Steel substrates, 100C6 type (AF- NOR norms), containing approximately 1 wt % of carbon, were coated at 200°C with titanium thin films by magnetron sputtering. The samples were characterized by X ray diffraction (XRD), Auger electron spectroscopy (AES) and scanning electron microscopy (SEM). Vikers micro-hardness measurements carried out on the annealed samples showed that the micro-hardness increases with annealing temperature, reaches a maximum (3500 kg/mm 2 ), then decreases progressively. The growth of micro-hardness is due to the diffusion of the carbon, and to the formation of titanium carbide. However, the decrease of microhardness is associated to the diffusion of iron and the formation of iron oxide (Fe 2 O 3 ). At higher temperatures, we note the formation of titanium oxide (TiO 2 ). 133
Page 1 and 2: Wüest M. 51 Wykes M. 82 Yamaguchi
Page 3 and 4: Oliveira F. J. 140 Orts M.J. 76 Ota
Page 5 and 6: Gabouze N. 125 Galán L. 112, 113,
Page 7 and 8: AUTHOR’S INDEX Aouabdia Y. 46 Aba
Page 9 and 10: AUTHORS’S INDEX 141
Page 11 and 12: JUNE 28 WEDNESDAY AFTERNOON JS2-WeA
Page 15: JUNE 28 WEDNESDAY AFTERNOON JS2-WeA
Page 27 and 28: JS1 POSTERS 123
Page 29 and 30: JUNE 28 WEDNESDAY AFTERNOON RIVA-TF
Page 35 and 36: RIVA-TF POSTERS 115
Page 37 and 38: JUNE 28 WEDNESDAY AFTERNOON RIVA-SS
Page 39 and 40: RIVA-SS POSTERS 111
Page 41 and 42: JUNE 28 WEDNESDAY MORNING WS-18-WeM
Page 43 and 44: JUNE 28 WEDNESDAY MORNING WS-18-TuA
Page 45 and 46: WS-18 SESSION 105
Page 47 and 48: JUNE 28 WEDNESDAY MORNING JS2-WeM-O
Page 49 and 50: JUNE 28 WEDNESDAY MORNING JS2-WeM-I
Page 51 and 52: JUNE 28 WEDNESDAY MORNING JS2-WeM-O
Page 53 and 54: JS2 SESSION 97
Page 55 and 56: JUNE 28 WEDNESDAY MORNING RIVA-SS-W
Page 63 and 64: RIVA-SS SESSION 87
Page 65 and 66: PLENARY 85
Page 67 and 68:
JUNE 27 TUESDAY AFTERNOON WS-18-TuA
Page 69 and 70:
JUNE 27 TUESDAY AFTERNOON WS-18-TuA
Page 71 and 72:
JUNE 27 TUESDAY AFTERNOON JS1 SESSI
Page 73 and 74:
JUNE 27 TUESDAY AFTERNOON JS1-TuA-I
Page 75 and 76:
JUNE 27 TUESDAY AFTERNOON JS1-TuA-I
Page 77 and 78:
TUESDAY AFTERNOON 73
Page 79 and 80:
JUNE 27 TUESDAY MORNING WS-18-TuM-O
Page 81 and 82:
JUNE 27 TUESDAY MORNING WS-18-TuM-O
Page 83 and 84:
JUNE 27 TUESDAY MORNING WS-18-TuM-I
Page 85 and 86:
JUNE 27 TUESDAY MORNING JS1-TuM-INV
Page 87 and 88:
Page 89 and 90:
JUNE 27 TUESDAY MORNING JS1-TuM-.IN
Page 91 and 92:
Page 93 and 94:
JS1 SESSION 57
Page 95 and 96:
PLENARY 55
Page 97 and 98:
JUNE 26 MONDAY AFTERNOON WS-18-MoA-
Page 99 and 100:
JUNE 26 MONDAY AFTERNOON WS-18-MoA.
Page 101 and 102:
WS-18 SESSION 49
Page 103 and 104:
JUNE 26 MONDAY AFTERNOON RIVA-TF-Mo
Page 105 and 106:
Page 107 and 108:
Page 109 and 110:
Page 111 and 112:
JUNE 26 MONDAY AFTERNOON ETCHC-MoA-
Page 113 and 114:
JUNE 26 MONDAY AFTERNOON ETCHC-MoA-
Page 115 and 116:
ETCHC SESSION 35
Page 117 and 118:
JUNE 26 MONDAY MORNING WS-18-MoM-OR
Page 119 and 120:
JUNE 26 MONDAY MORNING WS-18-MoM-OR
Page 121 and 122:
JUNE 26 MONDAY MORNING WS-18-MoM.IN
Page 123 and 124:
JUNE 26 MONDAY MORNING RIVA-TF-MoM-
Page 125 and 126:
Page 127 and 128:
Page 129 and 130:
Page 131 and 132:
Page 133 and 134:
JUNE 26 MONDAY MORNING ETCHC-MoM-OR
Page 135 and 136:
Page 137 and 138:
Page 139 and 140:
Page 141 and 142:
JUNE 26 MONDAY MORNING ETCHC--MoM-O
Page 143 and 144:
PARALLEL SESSIONS 7
Page 145 and 146:
PLENARY 5
Page 147 and 148:
JUNE 26, 2006 Morning Session INDEX
Page 149:
Sigilum Universitatis Studii Salama
show all

Wüest M. 51 Wykes M. 82 Yamaguchi M. 17 Ybarra G. 129 Yubero F ...

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?