High materials testing

Uranium-235 Enrichment. The enrichment of uranium is expressed as the weight percent of in uranium. For natural uranium the enrichment level is 0.72%. Many appHcations of uranium requite enrichment levels above 0.72%, such as nuclear reactor fuel (56,57). Normally for lightwater nuclear reactors (LWR), the 0.72% natural abundance of is enriched to 2—5% (9,58). There are special cases such as materials-testing reactors, high flux isotope reactors, compact naval reactors, or nuclear weapons where enrichment of 96—97% is used. 

R. A. Mercuri, R. A. Howard, and J. J. McGl meiy, Ndranced High Temperature Test Methodsfor Gasket Materials, Automotive Eng 97, 49—52 (July 1989). 

High-Throughput Materials Testing Surfaces, Interfaces, and Thin Films. 84... 

The mechanical properties of Micelle-Templated Silicas (MTS) are very sensitive items for industrial process applications which might submit catalysts or adsorbents to relevant pressure levels, either in the shaping of the solid or in the working conditions of catalysis or separation vessels. First studies about compression of these highly porous materials have shown a very low stability against pressure. These results concern these specific materials tested. In this study, we show very stable MTS with only a loss of 25% of the pore volume at 3 kbar. The effects of several synthesis parameters on the mechanical strength are discussed. 

The tests carried out on aluminium solutions with Cu, Mg, Mn, Cr, Ti and on copper solutions with Zn, Al, Sn, Cr and Zr demonstrated a relatively high agreement between experimental and calculated (eq. (5.11)) results. This equation can therefore be used in control tests in materials testing laboratories. 

Of the various high temp resistant materials tested for small arms tube liners, Stellite has the best properties (Ref 2, p 72). Because of its high mp and resistance to erosion, more rounds can be fired at faster rates than with other materials. Stellite 21 (MIL-C-13358) has the following chemical compn Co 62.2, Cr 27.4, Mo 5.5, Ni 2.8, Fe 0.70, Mn 0.66, Si 0.53 and C 0.22%. Physical properties available include a d at 70°F of 0.229 lb/cu inch, the thermal coeff of linear expansion over several temp ranges, and mechanical properties at various temps (Ref 2, p 72, Tables 16 17)... 

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