TiB2 基金属陶瓷的显微结构与力学性能

苗明清; 傅正义; 张金咏; 龚伦军

TiB2 基金属陶瓷的显微结构与力学性能

武汉理工大学材料复合新技术国家重点实验室, 武汉 430070

基金项目: 兰州大学甘肃省有色金属实验室基金(2003004 )

详细信息

通讯作者:
傅正义,教授,博士生导师,研究方向为材料加工、新材料合成等;会员证号:E63160001GJ E-mail:zyfu@public.wh.hb.cn

中图分类号: TB332
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出版历程
- 收稿日期: 2004-01-07
- 修回日期: 2004-04-11
- 刊出日期: 2005-02-14

MICROSTRUCTURE AND MECHANICAL PROPERTIES OF TiB2 CERMET

State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China

摘要

摘要: 以Fe-Ni-Ti-Al 为助烧剂, 用热压的方法制备了TiB2 基金属陶瓷。研究了烧结温度、烧结时间、助烧剂对材料显微结构和力学性能的影响, 初步分析了TiB2 基金属陶瓷的增韧机理。结果表明, 随着烧结温度的提高, 材料弯曲强度降低, 洛氏硬度升高;随着烧结时间延长, 弯曲强度出现峰值。SEM、EDS 观察表明, 助烧剂中的Ti 避免了Fe₂B、Ni₂₃B₆ 等脆性相的生成, Al 有除氧的作用。裂纹偏转和裂纹桥联是TiB2 金属陶瓷重要的增韧方式。
- TiB2 基金属陶瓷 /
- 热压烧结 /
- 助烧剂 /
- 力学性能
Abstract: TiB2 based cermet with Fe-Ni-Ti-Al as sintering aids was fabricated by hot-pressing. The effects of sinteringtemperature , holding time and sintering aids on microstructure and mechanical properties were investigated. The toughening mechanism of TiB2 based cermet was analysed. Experimental results show that the bending strength of TiB2 cermetdecreases and the Rockwell hardness increases with sintering temperature rising up ; a bending strength peak appears withholding time prolonged. According to the scanning electron microscope (SEM ) and energy dispersive spectrometer (EDS )observation , Ti in sintering aids is essential for avoiding the formation of extremely brittle secondary borides such as Fe₂Band Ni₂₃B₆ , while Al plays a deoxygen role. Crack deflection and crack bridging are important toughening ways of composite.
- TiB2 cermet /
- hot pressing /
- sintering aids /
- mechanical properties