Y－TZP和氮气压力对GPSSi_3N_4性能的影响

THE EFFECT OF Y-TZP AND NITROGEN PRESSURE ON THE PROPERTIES OF GPS Si_3N_4 CERAMIC MATERIALS

本文研究了Ｙ－ＴＺＰ（３ｍｏｌ％Ｙ２Ｏ３）和氮气压力对ＧＰＳＳｉ３Ｎ４陶瓷材料的烧结性能和力学性能、相组成及微观结构的影响，添加５ｗｔ％、１０ｗｔ％、１５ｗｔ％、２０ｗｔ％Ｙ－ＴＺＰ的氨化硅复合材料在１７７０～１８００℃，氮气压力分别为１ＭＰａ、２ＭＰａ、３ＭＰａ下烧成，获得相对密度＞９５％的烧结体。实验结果表明：添加＜１０ｗｔ％的Ｙ－ＴＺＰ及增大氮气压力有利于改善氰化硅陶瓷材料的烧结性能；Ｙ－ＴＺＰ可提高Ｓｉ３Ｎ４基体的断裂韧性，添加１５ｗｔ％ＴＺＰ的Ｓｉ３Ｎ４材料断裂韧性可达８．３３ＭＰａｍ１／２，与基体相比提高３０％，微裂纹增韧和第二相粒子增韧为主要增韧机理．

The effect of Y-TZP (3mol% Y2O3) and nitrogen pressure on the sintering properties,phase composition, microstructure and mechanical properties of GPS Si3N4 Ceramic Materials with Y2O3 and Al2O3 as sintering aids were studied. The Si3N4 composites with addition of 5wt%, 10wt%, 15wt%, 20wt% Y-TZP were sintered at 1770 ℃ to 1800 ℃ under nitrogen at 1MPa, 2MPa, 3MPa respectively.The sintered bodies with over 95% of theoretical densities were obtained.The experimental results indicated that adding<10wt% Y-TZP an...