Microstructures and mechanical properties of a two-layer B4C/Al–B4C/TiB2 composite
Microstructures and mechanical properties of a two-layer B4C/Al–B4C/TiB2 composite
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DOI：
10.1016/j.msea.2012.09.014
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发表时间：
2013
期刊：
影响因子：
6.4
通讯作者：
X. Yue;Jianjun Wang;Xiumei Li;Liuqing You;H. Ru
中科院分区：
文献类型：
--
作者：
X. Yue;Jianjun Wang;Xiumei Li;Liuqing You;H. Ru
采用真空热压浸渗铝两步法制备了B4 C/Al和B4 C/TiB 2两层结构的复合材料。实验结果表明，制备的B4 C/Al-B4 C/TiB 2复合材料具有良好的界面结合。在铝渗透过程之前，两层预制体的B4 C多孔层看起来像相互连接的毛细管的三维网络，可以促进液体铝的渗透。对于B4 C/TiB 2复合涂层，渗铝前后，TiB 2均匀分散在B4 C基体中，显微组织无明显变化。该材料的断裂韧性提高到纯B4 C材料的两倍左右。在双层材料的B4 C基体中观察到许多孪晶。
A two-layer structure composite, in which one layer was B4C/Al compound and the other layer was B4C/TiB2compound, was prepared using a two-step method for both hot pressing and infiltration of aluminum in vacuum. The experimental results showed that the two-layer B4C/Al–B4C/TiB2composite having good interfacial bonding was prepared. Before aluminum infiltration process, the B4C porous layer of the two-layer preform looked like a three-dimensional network of interconnected capillaries that could promote the infiltration of liquid aluminum. For the B4C/TiB2layer the TiB2dispersed homogeneously in B4C matrix and the microstructure showed no apparent change before and/or after aluminum infiltrating process. The fracture toughness of this material was improved to about twice that of pure B4C material. A number of twins were observed in the B4C matrix of the two-layer material.