Ti_3Si_(0.6)Al_(0.6)C_(1.98)陶瓷的制备与性能研究  

Preparation and Properties of Ti_3Si_(0.6)Al_(0.6)C_(1.98) Ceramics

作　　者：李翠伟[1] 王文娟[1] 王建[1] 翟洪祥[1] 周洋[1] 李世波[1] 

机构地区：[1]北京交通大学,北京100044

出　　处：《稀有金属材料与工程》2009年第A02期168-171,共4页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(50472045);新型陶瓷与精细工艺国家重点实验室开放基金资助

摘　　要：采用原位热压工艺制备了高纯Ti3Si0.6Al0.6C1.98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℃,30MPa压力下保温1h,高纯Ar气保护,制备试样的主要物相为Ti3Si0.6Al0.6C1.98。制备的Ti3Si0.6Al0.6C1.98陶瓷的密度为(4.43±0.23)g/cm3,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·m1/2。Ti3Si0.6Al0.6C1.98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。Ti3Si0.6Al0.6C1.98 solid solution ceramics were prepared and their properties were tested. High purity Ti3Si0.6Al0.6C1.98 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 Ti3Si0.6Al0.6C1.98 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 Ti3Si0.6Al0.6C1.98 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.

关 键 词：TI3SIC2 固溶体 原位热压烧结 性能 

分 类 号：TQ174.1[化学工程—陶瓷工业]