Densification,microstructure,and fracture behavior of TiC/Si_3N_4 composites by spark plasma sintering

作     者：BAI Ling GE Changchun SHEN Weiping MAO Xiaodong ZHANG Ke BAI Ling GE Changchun SHEN Weiping MAO Xiaodong ZHANG Ke Laboratory of Special Ceramics and Powder Metallurgy,University of Science and Technology Beijing,Beijing 100083,China

作者机构：Laboratory of Special Ceramics and Powder Metallurgy University of Science and Technology Beijing Beijing 100083 China 

出 版 物：《Rare Metals》 (稀有金属（英文版）)

年 卷 期：2008年第27卷第3期

页      面：315-319页

核心收录：

学科分类：081704[工学-应用化学] 07[理学] 070304[理学-物理化学(含∶化学物理)] 08[工学] 0817[工学-化学工程与技术] 0703[理学-化学] 

基　　金：National High-tech Research and Development Program: 2001AA333080 

主　　题：silicon nitride titanium carbide spark plasma sintering (SPS) microstructure fracture behavior 

摘      要：TiC/Si3N4 composites were prepared using the β-Si3N4 powder synthesized by self-propagating high-temperature synthesis （SHS） and 35 wt.% TiC by spark plasma sintering. Y2O3 and Al2O3 were added as sintering additives. The almost full sintered density and the highest fracture toughness （8.48 MPa·m1/2） values of Si3N4-based ceramics could be achieved at 1550℃. No interfacial interactions were noticeable between TiC and Si3N4. The toughening mechanisms in TiC/Si3N4 composites were attributed to crack deflection, microcrack toughening, and crack impedance by the periodic compressive stress in the Si3N4 matrix. However, increasing microcracks easily led to excessive connection of microcracks, which would not be beneficial to the strength.