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以Ti、Mo、C、Ni粉末为原料在氩气保护下通过高能球磨诱发的自蔓延燃烧反应合成了TiC-Ni和(Ti,Mo)C-Ni复合粉末,将合成的粉末经成形和烧结后制备得到了高韧性的金属陶瓷材料,并对碳化物的形成机理以及金属陶瓷的显微组织与力学性能进行了研究。结果表明:高能球磨诱发的自蔓延燃烧反应释放的热量造成了金属Ni熔化产生液相,Ti、Mo、C不断溶解于液相并发生反应,生成的TiC或(Ti,Mo)C在液相中形成并析出;制备得到的TiC-Ni和(Ti,Mo)C-Ni金属陶瓷易于烧结致密化,其硬度不低于13.2 GPa,弯曲强度不低于1 559 MPa,与传统粉末冶金方法制备的金属陶瓷相当,但是其断裂韧性高于传统金属陶瓷,可达12.04 MPa·m1/2。
The TiC-Ni and (Ti, Mo) C-Ni composite powders were synthesized by self-propagating high-energy ball milling-induced reaction under the protection of argon gas with Ti, Mo, C and Ni powders as raw materials and the synthesized powders were shaped and sintered The high-toughness cermets were prepared and the formation mechanism of carbides and the microstructure and mechanical properties of cermets were studied. The results show that the heat released by self-propagating combustion reaction induced by high-energy ball milling causes the metal Ni to melt to form a liquid phase. Ti, Mo and C are continuously dissolved in the liquid phase and react. The generated TiC or (Ti, Mo) The TiC-Ni and (Ti, Mo) C-Ni cermets were easily sintered and densified with a hardness of not less than 13.2 GPa and a bending strength of not less than 1 559 MPa. Compared with the conventional powder metallurgy Of the cermet, but its fracture toughness is higher than the traditional cermet, up to 12.04 MPa · m1 / 2.