采用原位热压工艺制备了高纯Ti_3Si_0.6Al_0.6C_1.98陶瓷,并测试了性能.以单质的Ti、Si、Al和石墨粉为原料,摩尔比Ti:Si:Al:C=3:0.6:0.6:1.98,在1500 ℃,30 MPa压力下保温1 h,高纯Ar气保护,制备试样的主要物相为Ti_3Si_0.6Al_0.6C_1.98.制备的Ti_3Si_0.6Al_0.6C_1.98陶瓷的密度为(4.43±0.23) g/cm~3,电阻率为(0.31±0.01)μΩ·m,抗弯强度为(245.46±22.04) MPa,维氏硬度为(2.91±0.32) GPa, 断裂韧性为(5.63±0.39) MPa·m~(1/2).Ti_3Si_0.6Al_0.6C_1.98陶瓷中晶粒以板状晶为主,晶粒层状结构明显,断口形貌显示主要为穿晶断裂,晶粒的分层断裂、微裂纹的偏转桥接及滑移使材料具有独特的压痕特征.
Ti_3Si_0.6Al_0.6C_1.98 solid solution ceramics were prepared and their properties were tested. High purity Ti_3Si_0.6Al_0.6C_1.98 solid solution ceramics have been fabricated by in-situ hot pressing a mixture of elementary titanium, silicon, aluminun and graphite powders at a pressure of 30 MPa and temperature of 1500℃ for 1 h. The density of the sintered Ti_3Si_0.6Al_0.6C_1.98 solid solution ceramics was (4.43±0.23) g/cm~3. The electrical resistance was (0.31±0.01) μΩ·m. The bending strength was (245.46±22.04) MPa. The Vickers hardness was (2.91±0.32) GPa. And fracture toughness was (5.63±0.39) MPa·m~(1/2). The grains of the Ti_3Si_0.6Al_0.6C_1.98 solid solution ceramics were planary with the nano laminate structure. And cross grain fracture was the main fracture model. The unique characteristics of the indentation surfaces are attributed to a multiple mechanism: delamination on the basal planes, microcrack deflection and bridging, debonding, etc.
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