固体粒子の衝突によるSiC およびSi_3N_4 系セラミックスの破壊挙動

概要

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Ball contact damages were investigated on pressureless sintered SiC and Si_3N_4 ceramics. Impact tests were carried out using the air gun system. Three kinds of balls ; steel,SiC and Si_3N_4,the size of which was 3 mm in diameter,were used as projectiles,and four kinds of ceramics were used as target specimens of size 7.5×10×85mm. After the impact tests,three point bending tests were carried out to evaluate the residual strength of the specimens,and differences in failures with ball contact were disscussed taking the results of numerical analyses into consideration. The results are summarized as follows ; (1) The residual strength could not be estimated by the diameter of the ring crack. (2) SiC specimens with steel ball impact, and Si_3N_4, specimens with SiC ball impact showed the largest degradation of strength. (3) Distinction of fracture between SiC and Si_3N_4 specimens seemed to be caused by the differences in strength and fracture toughness of these materials.
社団法人日本材料学会の論文
1990-08-15