MgO-SiC ウイスカー複合セラミックスの破壊エネルギ(<小特集>セラミック材料)

概要

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In order to develop MgO base ceramics having higher thermal shock resistance for MHD plant use, ceramic composites of MgO reinforced -with 15 and 20 wt% of SiC whisker were fabricated by the hot-pressing at 1 800℃ and 1 900℃ under 200 kg/cm2 for 30min. The effective fracture energy (retf) of the hot-pressed composites and MgO ' were measured by work of fracture technique using chevron notched specimens over the range from room temperature to 1 400℃. Up to 1 000℃. the T*ff Values of ~ the composite ceramics were slightly lager than those of the hot-pressed MgO. At temperatures above I 000℃, the Tetf values of the composites increased remarkably, and were about 3-7 times higher than those of hot-pressed MgO at 1 400℃. The mechanism of the/Increase m T.ff values were discussed on the basis of the load-deflection behavior in bending fracture, the chemical reaction of SiC whisker with MgO matrix and the fracture surface morphology.
社団法人日本材料学会の論文
1987-01-15