MECHANICAL BEHAVIOR OF POLYCRYSTALLINE CERAMICS.
HONEYWELL RESEARCH CENTER HOPKINS MINN
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The fabrication of high density, high purity, fine grained polycrystalline MgO, NiO, and TiC ceramics from micron and sub-micron powders by sintering and hot pressing techniques is discussed. The influence of pore size, pore location, grain size, surface damage, grain boundary condition, and certain impurities on the room temperature fracture behavior of these cubic materials is summarized. Fracture behavior studies on chemically polished, polycrystalline MgO were made to 1200C for various types of microstructures. Some ductility in certain high density MgO structures was observed at temperatures as low as 800C and progressively more ductility occurred at the higher temperatures. Certain electrical behavior in NiO and TiC was studied and, in the case of TiC, a preliminary correlated with mechanical behavior was made. Author