Synthesis and mechanical properties of (Ti, Mo)2AlC/Al2O3 composite by a reaction hot pressing method
Synthesis and mechanical properties of (Ti, Mo)2AlC/Al2O3 composite by a reaction hot pressing method
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DOI：
10.1016/j.ceramint.2012.12.076
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发表时间：
2013-07
影响因子：
5.2
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，采用反应热压烧结法成功制备了致密的（Ti，Mo）2AlC/10wt%Al2O3原位复合材料，并对反应途径进行了详细研究。发现（Ti，Mo）2AlC/10wt%Al2O3复合材料的制备是由一系列中间反应组成的，Ti与Al的第一反应生成Ti-Al金属间化合物，Al与MoO 3的铝热反应生成Al 2 O3和Mo。然后金属间化合物和残余Ti、Al转变为TiAl平衡相。最后，通过TiAl、TiC和Mo的反应形成（Ti，Mo）2AlC/Al 2 O3复合材料。复合材料的维氏硬度、弯曲强度、压缩强度和断裂韧性分别为4.75GPa、458 MPa、971 MPa和6.03MPam1/2，比单相Ti 2AlC分别提高了25%、69%、48%和146%。并对增强机理进行了探讨。
A dense (Ti, Mo)2A1C/10wt% Al2O3in-situ composite was successfully fabricated from powder mixtures of Ti, Al, TiC and MoO3by reactive hot pressing sintering, and the reaction path was investigated in detail. It was found that the production of the (Ti, Mo)2A1C/10wt% Al2O3was composed of a series of intermediate reactions: i.e., first reaction between Ti and Al forms Ti–Al intermetallics, and the thermite reaction between Al and MoO3producing Al2O3and Mo. Then the intermetallics and the residual Ti and Al transformed to TiAl equilibrium phase. Finally, the (Ti, Mo)2A1C/Al2O3composite was formed by the reaction of TiAl TiC, and Mo. The Vickers hardness, flexural strength, compressive strength and fracture toughness of the composite were 4.75GPa, 458MPa, 971MPa, and 6.03MPam1/2, which are improved by 25%, 69%, 48%, and 146%, respectively, compared to the single-phase Ti2AlC. The reinforcing mechanism was also discussed.