Synthesis of Layered-Ternary Ti2AlC/Al2O3 Composites by an In Situ Reaction and Hot Pressing Sintering
Synthesis of Layered-Ternary Ti2AlC/Al2O3 Composites by an In Situ Reaction and Hot Pressing Sintering
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DOI：
10.4028/www.scientific.net/msf.724.315
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发表时间：
2012-06
期刊：
影响因子：
--
通讯作者：
Jianfeng Zhu;R. Pan
中科院分区：
文献类型：
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作者：
Jianfeng Zhu;R. Pan
以Ti、Al、TiC和MoO 3为原料，采用原位反应/热压法制备了Mo改性Ti 2AlC/Al 2 O3复合材料。详细研究了反应途径及原料配比对相组成的影响。所制备的材料主要由（Ti 1-xMox）2AlC固溶体、Al 2 O3和少量富Mo化合物组成。结果表明，原位生成的细小Al 2 O3颗粒倾向于分散在基体晶界上。与Ti_2AlC相比，（Ti，Mo）_2AlC/10wt%Al_2O_3复合材料具有细晶结构。复合材料的维氏硬度、弯曲强度、断裂韧性和压缩强度分别为4.75GPa、458 MPa、6.03MPa·m1/2和971 MPa。
Mo modified Ti2A1C /Al2O3 composites were successfully fabricated from an elemental power mixture of Ti, Al, TiC and MoO3 by an in situ reaction/hot pressing method. The reaction path and effect of the molar ratio of the initial materials on the phase composition were investigated in detail. The as-prepared materials are mainly composed of (Ti1-xMox)2AlC solid solutions, Al2O3, and a small amounts of the Mo rich compounds. It is found that the in situ formed fine Al2O3 particles tend to disperse on the matrix grain boundaries. Compared with the monolithic Ti2A1C, (Ti,Mo)2AlC/10 wt% Al2O3 composite possesses a fine grain sized structure. The Vickers hardness, flexural strength, fracture toughness, and compressive strength of the as composite are 4.75 GPa, 458 MPa, 6.03 MPa·m1/2, 971 MPa, respectively.