High strength B4C–TiB2 composites fabricated by reaction hot-pressing
High strength B4C–TiB2 composites fabricated by reaction hot-pressing
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DOI：
10.1016/s0955-2219(02)00274-1
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发表时间：
2003-06
影响因子：
5.7
通讯作者：
S. Yamada;K. Hirao;Y. Yamauchi;S. Kanzaki
中科院分区：
文献类型：
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作者：
S. Yamada;K. Hirao;Y. Yamauchi;S. Kanzaki
以4种不同亚微米级B4 C粉末为原料，添加纳米级TiO 2和C粉末，在2000 °C下反应热压制备了TiB 2含量为20mol%的B4 C基复合材料，并对其力学性能进行了测试。采用平均粒度为0.50 μm的B_4C粉末和0.3- 0.5wt.%的金属杂质，可获得强度为866 MPa、断裂韧性为3.2MPa·m ~（1/2）的B_4C-TiB_2复合材料(Al+ Fe）。这可能是由于B4 C组织的细化、TiB 2颗粒的均匀弥散以及断裂韧性的提高。
B4C based composites with 20 mol% TiB2were fabricated by reaction hot-pressing of four different submicron size B4C powders with the addition of nanometer size TiO2and C powders at 2000 °C, and their mechanical properties were examined. A B4C–TiB2composite with both high strength of 866 MPa and modest fracture toughness of 3.2 MPa m1/2could be obtained using B4C powder with a mean particle size of 0.50 μm and total metal impurity 0.3–0.5 wt.% (Al + Fe). It seems that this extremely high strength is attributed to the fine-grained B4C microstructure, uniform dispersion of TiB2particles and improvement of fracture toughness.