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In the paper, the effect of heat-treatment on thestrength and toughness of AlN-SiC whisker composites with Y_2O_3+SiO_2 additives have been studied. When the sample contining 10wt%Y_2O_3+SiO_2(Y_2O_3/SiO_2=1/0. 66) was treated at 1330℃ in air for 140hours,the flexural strength of composites was raised from 481 MPa to784 MPa the toughness was also enhanced slightly. The phase composi-tion microstructure and grain boundary phase structure have been char-acterized by combining XDR, SEM, TEM/EDXA and HREM tech-niques. reinforcenent and toughening mechanism of the composites re-sults from the crystallization of glass phase in the grain boundary atthe high temperature oxidizing atmosphere to form the crossing struc-ture of 2H°sialon fibrous phase and SiC whisker
In the paper, the effect of heat-treatment on the strength and toughness of AlN-SiC whisker composites with Y 2 O 3 + SiO 2 additives have been studied. When the sample contining 10 wt% Y 2 O 3 + SiO 2 (Y 2 O 3 / SiO 2 = 1/0. 66) was treated at 1330 ° C in air for 140 hours, the flexural strength of composites was raised from 481 MPa to 784 MPa the toughness was also enhanced slightly. The phase composi tion microstructure and grain boundary phase structure have been char-acterized by combining XDR, SEM, TEM / EDXA and HREM tech-niques. Reinforcent and toughening mechanism of the composites re-sults from the crystallization of glass phase in the grain boundary atthe high temperature oxidizing atmosphere to form the crossing struc-ture of 2H ° sialon fibrous phase and SiC whisker