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《Acta Materiae Compositae Sinica》 2015-03
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Microstructure and mechanical properties of TiC_(0.7)N_(0.3) reinforcing ZrO_2 matrix composites

ZHANG Mengwen;HAN Chengwei;XIU Zhimeng;SUN Xudong;Key Laboratory for Anisotropy and Texture of Materials,Ministry of Education,Northeastern University;  
To enhance the hardness of ZrO2 matrix composites,TiC0.7N0.3/ZrO2 composites were fabricated by hot pressing method,and the effects of TiC0.7N0.3 particle reinforcing phase on the phase composition,microstructure and mechanical properties of the composites were investigated.The results show that the addition of TiC0.7N0.3has the effect to stabilize tetragonal ZrO2(t-ZrO2),and can improve the t-ZrO2 content in TiC0.7N0.3/ZrO2 composites,thus improve the fracture toughness.With the hot pressing temperature and TiC0.7N0.3content increasing,the hardness of composites increases.When hot pressing at 1 400 ℃,TiC0.7N0.3decomposes partially,and the released N can react with reduced ZrO2 to form ZrN,which increases the hardness of composites.The relative density of35wt% TiC0.7N0.3/ZrO2 composites after hot pressing at 1 400 ℃ exceeds 99.9% and Vickers hardness reaches17 GPa.While the fracture toughness of composites is higher after hot pressing at 1 300 ℃,which is 6.48 MPa·m1/2.The conclusions provide references for microstructure controlling and improvement TiC0.7N0.3/ZrO2 composite properties.
【Fund】: 国家科技重大专项(2012ZX04003-061)
【CateGory Index】: TB332
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