SiC晶须添加量对Ti(C_(0.7),N_(0.3))基金属陶瓷组织和性能的影响
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摘要
用粉末冶金法制备了Ti(C_(0.7),N_(0.3))基金属陶瓷复合材料。使用XRD、SEM、硬度计和万能试验机等研究了Si C晶须添加量对Ti(C_(0.7),N_(0.3))基金属陶瓷显微组织和力学性能的影响。结果表明,Ti(C_(0.7),N_(0.3))基金属陶瓷具有明显、完整的"芯-环"结构,与未添加晶须的基体组织相比,添加了晶须的金属陶瓷组织中出现了"白芯-灰壳"结构,晶粒更加细化;随着晶须含量增加,金属陶瓷硬度下降,而抗弯强度和断裂韧性先升后降。当晶须添加量为1.5%时,金属陶瓷在硬度略微下降的情况下强韧性获得了最大提升,抗弯强度、断裂韧性分别达到1 620 MPa、12.2 MPa·m~(1/2),较未添加晶须时分别提高了13.3%和16.1%。
The Ti(C_(0.7),N_(0.3))-based cermet composite was fabricated by powder metallurgy. The effect of Si C whisker addition on the microstructure and properties of Ti(C_(0.7),N_(0.3))-based metalceramics was studied by using XRD, SEM,hardness tester and universal testing machine. The results show that the Ti(C_(0.7),N_(0.3))-based metalceramics has an obvious and complete "core-rim" structure, compared with the matrix structure without whiskers, a"white core-gray rim"structure added with whiskers appeared in the cermet structure, and the crystal grains are more refined. As the whisker content increased,the hardness of the cermet decreased, while the transverse rupture strength and fracture toughness showed a trend of rising first and then decreasing. When the addition amount of whiskers is 1.5%, the strength and toughness of the cermet has a largest improvement while the hardness has a slight drop. The transverse rupture strength and fracture toughness are respectively 1 620 MPa and 12.2 MPa·m~(1/2), which were 13.3% and 16.1% higher than those without whisker, respectively.
The Ti(C_(0.7),N_(0.3))-based cermet composite was fabricated by powder metallurgy. The effect of Si C whisker addition on the microstructure and properties of Ti(C_(0.7),N_(0.3))-based metalceramics was studied by using XRD, SEM,hardness tester and universal testing machine. The results show that the Ti(C_(0.7),N_(0.3))-based metalceramics has an obvious and complete "core-rim" structure, compared with the matrix structure without whiskers, a"white core-gray rim"structure added with whiskers appeared in the cermet structure, and the crystal grains are more refined. As the whisker content increased,the hardness of the cermet decreased, while the transverse rupture strength and fracture toughness showed a trend of rising first and then decreasing. When the addition amount of whiskers is 1.5%, the strength and toughness of the cermet has a largest improvement while the hardness has a slight drop. The transverse rupture strength and fracture toughness are respectively 1 620 MPa and 12.2 MPa·m~(1/2), which were 13.3% and 16.1% higher than those without whisker, respectively.
引文
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[3]李喜宝,柯昌明,李楠.SiC晶须增韧陶瓷基复合材料的研究进展[J].材料导报,2007,21(5):394-397.
[4]刘兵,张茜,姜山,等.Si3N4晶须对TiC0.7N0.3-WC-Ta C-Mo-(Ni,Co)金属陶瓷组织和性能的影响研究[J].功能材料,2016,47(3):3125-3128.
[5]张卫珂,常杰,张敏,等.SiC晶须增韧B4C-Si复合陶瓷材料[J].陶瓷学报,2014,35(1):62-65.
[6]孙海军.SiC晶须改性WC基复合材料制备及摩擦磨损性能研究[D].湘潭:湘潭大学,2014.
[7]Shetty D K,Wright I G,Mincer P N,et al.Indentation fracture of WC-Co cermets[J].Journal of Materials Science,1985,20(5):1873-1882.
[8]Wu Peng,Zheng Yong,Zhao Yongle,et al.Effect of SiC whisker addition on the microstructures and mechanical properties of Ti(C,N)-based cermets[J].Materials and Design,2011,32:951-956.
[9]Yoshimura H,Sugizawa T,Nishigaki K,et al.Reaction occurring during sintering and the characteristics of TiC-20TiN-15WC-10TaC-9Mo-5.5Ni-11Co cermet[J].International Journal of Refractory Metals&Hard Materials,1983,2(4):170-174.
[10]Zheng Yong,Liu Wen-jun,WANG Sheng-xiang,et al.Effect of carbon content on the microstructure and mechanical properties of Ti(C,N)-based cermets[J].Ceramics International,2004,30(8):2111-2115.
[11]吕学鹏,郑勇,吴鹏.碳纳米管添加量对Ti(C,N)基金属陶瓷组织和力学性能的影响[J].中国有色金属学报,2011,21(1):145-151.
[12]Yang M,Stevens R.Microstructure and properties of SiC whisker reinforced ceramic composites[J].Journal of Material Science,1991,26:726-736.
[13]Philips D C,Gerald J.Fiber optic bearing monitor[J].International Journal of Powder Metallurgy and Powder Technology,1982,29(5):43-45.