ORNL-4191 - the Molten Salt Energy Technologies Web Site
ORNL-4191 - the Molten Salt Energy Technologies Web Site ORNL-4191 - the Molten Salt Energy Technologies Web Site
17.1 MATERIALS PROCURE ANDPROPERTY EVALUATION wl. H. Cook The procurement and evaluation of potential grades of graphite for the MSBR remain largely limited to experimental grades of graphite. Generally, most of these were not fabricated specifically for MSBR requirements. Consequently, they tend to have pore entrance diameters larger than the specified 1 /L and gas permeabiliti-es greater than the desired cm2/sec €or helium. Other properties are reasonably good. The latest graphites, discussed below, fall into these classifications. Precursory examinations of five experimental and two specialty grades of isotropic graphite have been made using 0.125-in.-diam by l.OOO-in.-long specimens machined from stock and tested in a mercury porosimeter. 'The pore entrance diameter distributions are suinmarized in Fig. 17.1. The insets on each plot give the grade designation, the bulk density, and accessible porosity of the specimens tested. The data indicate trends rather than absolute values for each grade. Grades .4XT;-SQBG and H-315A are the specialty grades, and the others are experimental grades. Grade AXF-5QHG is an impregnated version of grade AXF (previous designation, EP-1924), which looked promising in previous tests in that the entrance diameters of most pores were less than 1 p. The specimens for giade AXF-SQ'CX, 1-1, and 16-1 (Fig. 17.1) were taken perpendicular and specimens 1.-4 and 16-4 were taken parallel with the 4 x 6 in. plane of two different plates, each 1'; x 4 x 6 in. Individual results on these were plotted to show the variations of properties. The pore ................... 'W. 11, Cook, MSR Program Semiann Pro& Hept. Feb. 28, 1967, ORNL-4119, pp~ 108-10. 208 sizes of the impregnated materials vary more than those of the base stock but are around the 1-/L size sought. It would be desirable for the pore entrance diameters to be smaller and more uniformly distributed. The impregnation of the base stock reduced its accessible porosity approxiinately 30%. The experimental grade H17-'1'174 has a pore distribution similar to that of grade AXF-SQBG. Grades II-335, -336, -337, and -338 were small samples of isotropic graphite that had been impregnated and the impregnate graphitized. Grade H-315A was the base stock impregnated to make grade €3-335. The similar pore size distributions of H-315A and H-335 illustrate again the wellknown fact that graphite with pore entrance diameters greater than 1 p is not changed much by conventional iinpregnatjon techniques. 2.3 The plot for II-315A is an average of measurements on four specimens machined from different locations of a 4' 1i1 ,-in.-OD x 3'/,-in.-IU x 11'2-in. pipe section; the uniformity of the spectrum of pore entrance diameters was good. 'The three materials H-336, -337, and -338 appear to have been made from base stocks with pore spectra similar to that of H-315A. The accessible porosities measured for H-337 and -338 are relatively low for the small size of test specimens. used . Some mechanical properties, specific resistivities, and gas perrneabilities ai2 given in Table 17.1 for H-315A and -335 through -338. The mzchanical properties and specific resistivities of these grades are satisfactory for MSHR graphite. The gas permeabilities are high relative to those sought but seem to be typical for grades of graphite 2W. P. Eatherly et al., Proc. U.N. Intern. Conf. Peaceful Uses At. Energy, 2nd, Geneva. 1958 7, 389.- 401 (1958). 3W. Watt, R. L. Bickerman, and L, W. Graham, Engi- neering 189, 110-1 1 (January 1960).
AXF-5QRG 4-4 4 a9g/rm3 4f 56 % ~ AXF--SQBG iG--.i L92 g/cm3 40.83 yo i6-4 1 84 3 /cm3 14.94 7" h ORNIL --I)WG t'7-IiR3G ,17, I 209 100 43 30 20 io 05 04 0 05 002 001 PORE ENiFlANCE DIAMETER (pL) Fig. 17.1. Comparison of the Distributions of the Pore Entrance Diameters for Various Grades of Graphite.
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AXF-5QRG<br />
4-4<br />
4 a9g/rm3<br />
4f 56 %<br />
~<br />
AXF--SQBG<br />
iG--.i<br />
L92 g/cm3<br />
40.83 yo<br />
i6-4<br />
1 84 3 /cm3<br />
14.94 7" h<br />
ORNIL --I)WG t'7-IiR3G<br />
,17, I<br />
209 100 43 30 20 io 05 04 0 05 002 001<br />
PORE ENiFlANCE DIAMETER (pL)<br />
Fig. 17.1. Comparison of <strong>the</strong> Distributions of <strong>the</strong> Pore Entrance Diameters for Various Grades of Graphite.
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