Understanding Information Age Warfare

Abstract

Environmental SEM tribometry of the pressureless-sintered Hexoloy a-SiC ceramics was continued in 0.2 and 3.4 Torr partial pressures of oxygen (P0 2) at room temperature (RT) to 950°C, coupled with after-test SEM photomicrography and AES/XPS surface analyses of the wear scars and the adjacent (unused) surfaces. The results show some correlation in the somewhat improved friction behavior of both the previously tested CERCOM SiC-B in partial pressures of oxygen compared to vacuum, especially when the slower tribo-oxidation kinetics and the surface-oxide-induced reduction in grain pull-out of the boron/carbon-pressed Hexoloy are taken into account. Even in the presence of the thickest lubricating film formed at the 3.4 Torr P 0 2 , the COF still did not become reduced below-0.2 (and the MAX.COF below 0.3). These values are an order-of-magnitude higher than those of the polished PCD. The same observation was made with the SiC-B previously. The wear rate of Hexoloy is only slightly (albeit consistently) less in oxygen than that of the SiC-B, with both in the 10'mW/N.m range (an order-of-magnitude greater than PCD). Considering the overall tribological behavior of both a-SiC materials, neither is able to serve better than PCD in MEMS moving mechanical assembly applications intended for extreme environments. 14. SUBJECT TERMS 15. NUMBER OF PAGES MEMS, poly-XTL ax-SiC, friction, wear, SEM tribometry, vacuum, oxygen partial pressures, high temperatures, SEM/AES/XPS analyses, dangling bonds 16. PRICE CODE re(de)construction, graphitization, gas-phase lubrication. 17. SECURITY CLASSIFICATION 18. SECURITY CLASSIFICATION 19. SECURITY CLASSIFICATION 20. LIMITATION OF ABSTRACT OF REPORT OF THIS PAGE

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