Ti_3AlC_2的制备与微观结构  

FABRICATION AND MICROSTRUCTURE OF Ti_3AlC_2

作　　者：梅炳初[1] 徐学文[1] 朱教群[1] 刘俊[1] 

机构地区：[1]武汉理工大学材料复合新技术国家重点实验室,武汉430070

出　　处：《硅酸盐学报》2004年第7期897-900,共4页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金(500242008)资助项目;教育部博士基金项目资助(20020422001)。

摘　　要：热压烧结不同原料制备Ti3AlC2,结果表明:热压烧结Ti,Al,C原始粉很难得到高纯致密的Ti3AlC2。当以TiC代替C和部分Ti,并掺加摩尔比为0.1～0.2的Si时,可以得到致密的单相材料。掺加的Si均匀分布在基体中,形成固溶体Ti2.76Al0.78Si0.22C2。烧结试样的晶体为层片状结构,1300℃和1400℃烧结试样的晶粒尺寸分别为6～8μm和15～20μm。材料的Vicker硬度为3.3～5.0GPa,弹性模量为289GPa,抗压强度为785MPa,抗弯强度为375MPa,断裂韧性为7.0MPa·m1/2。Fabrication of Ti3AlC2 with different starting mixture powders sintered by hot pressing (HP) was studied. The results show that the single-phase bulk Ti3AlC2 with high density is difficult to be fabricated with Ti, A1,C powders by HP. The single-phase dense polycrystalline samples were obtained by TiC doped Si in molar ratio of 0.1-0.2, instead of C and parts of Ti powders. Doped Si is homogeneously distributed on a substrate forming solid solution of Ti2.76A10.78Si0.22C2. The crystals obtained are in laminate shape with dimensions of 6-8 μm and 15-20 μm synthesized at 1300°C and 1400°C. Vicker's hardness, Young's modules, compressive strength, flexural strength and fracture toughness are 3.3-5.0 GPa, 289 GPa, 785 MPa, 375 MPa, and 7.0 Mpa&middotm1/2, respectively.

关 键 词：钛铝化碳 热压 力学性能 

分 类 号：TM286[一般工业技术—材料科学与工程]