(合肥工業(yè)大學 材料科學與工程學院，合肥 230009)
摘 要: 采用真空燒結法制備納米TiN改性的Ti(C, N)基金屬陶瓷，研究不同金屬相對納米改性Ti(C, N)基金屬陶瓷組織和力學性能的影響。結果表明：除經典的黑芯/灰殼組織外，添加納米TiN的金屬陶瓷在黑芯內還出現灰芯結構；納米TiN主要分布在陶瓷相顆粒的晶界處；相對于未添加納米TiN的金屬陶瓷，添加納米TiN粉末能明顯提高金屬陶瓷的抗彎強度、硬度與斷裂韌性；對納米TiN改性的金屬陶瓷而言，金屬相Ni能提供更好的抗彎強度與斷裂韌性，而金屬相Co則能帶來更高的硬度。
關鍵字: 金屬陶瓷；硬質相；粘結相；顯微組織；力學性能
（School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China）
Abstract:The nano-TiN modified Ti(C, N)-based cermets were fabricated by vacuum sintering, and the effects of different metallic phases on the microstructure and mechanical properties of nano-TiN modified cermets were studied. The results show that the grey core microstructure exists in black core besides typical black core/grey rim, the nano-TiN locates at the ceramic phase boundaries. The results of mechanical properties show that the addition of nano-TiN powder can improve transverse rupture strength, hardness and fracture toughness of cermets clearly compared with that without TiN. The metallic phase Ni can bring much better transverse rupture strength and toughness while Co can offer much higher hardness in cermets modified by nano-TiN.
Key words: cermets; hard phase; binder phase; microstructure; mechanical properties
