In situ reaction synthesis of Ti–TiB composites containing high volume fraction of TiB by spark plasma sintering process
2010; Elsevier BV; Volume: 503; Issue: 1 Linguagem: Inglês
10.1016/j.jallcom.2010.04.218
ISSN1873-4669
AutoresZhaohui Zhang, Xiang-Bo Shen, Sai Wen, Jie Luo, Shu-Kui Lee, Fuchi Wang,
Tópico(s)Titanium Alloys Microstructure and Properties
ResumoThe in situ toughened Ti–TiB ceramic–matrix composites containing high volume fraction of TiB were synthesized by spark plasma sintering technique under a pressure of 50 MPa, with sintering temperature ranging from 1100 °C to 1400 °C and heating rate of 150 °C/min, using Ti and TiB2 powders. Results indicated that Ti–TiB composites sintered at 1400 °C provided the optimal combination of dense microstructure, well developed lath-shaped TiB grains, and excellent mechanical properties, including the relative density of 99.6%, bending strength of 608 MPa, and a rather high fracture toughness of 9.35 MPa m1/2. Moreover, the micro-hardness of the composites reaches a relatively high level (18.3 GPa).
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