ZrO<sub>2</sub>颗粒状态对SiC/金刚石复相陶瓷结构、性能的影响

臧建兵; 王明智; 王艳辉

ZrO₂颗粒状态对SiC/金刚石复相陶瓷结构、性能的影响

燕山大学材料工程学院, 秦皇岛 066004

基金项目: 国家自然科学基金项目: 59382013

详细信息

中图分类号: TF125, TF125. 34
计量
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出版历程
- 收稿日期: 1997-03-09
- 修回日期: 1997-05-06
- 刊出日期: 1998-03-24

EFFECT OF ZrO₂ POWDER FORM ON THE STRUCTURE AND PROPERTIES OF SiC/DIAMOND COMPOSITE

Yanshan University, Qinhuangdao 066004

摘要

摘要: 本文用不同水解时间辅以氨水沉淀制备了不同颗粒尺寸的纳米(9nm ) ZrO₂ (Y₂O₃) 粉体。以其为增韧相, 在高温(1350℃) 超高压(5GPa) 条件下烧结ZrO₂ (Y₂O₃) + SiC+ 金刚石超硬复相陶瓷, 用TEM、SEM、XRD、冲击韧性测定和磨耗比测定研究了ZrO₂ (Y₂O₃) 颗粒形状特征及对超硬复相陶瓷相结构及机械性能的影响。结果表明, ZrO₂ (Y₂O₃) 制备的水解时间≥50h, ZrO₂ (Y₂O₃) 颗粒均一, 在复相陶瓷内均一分布, 以100% t 相存留, 断裂过程中t →m 转变量≥20vo l% , 使超硬复相陶瓷具备较高韧性及耐磨性。
- ZrO₂, 金刚石, SiC, 颗粒, 水解
Abstract: Nanocrystalline ZrO₂ (Y₂O₃) powder with different particle sizes was prepared by a boiling hydrolysis method. SiC/ diamond composite toughened with the ZrO₂ (Y₂O₃) was sintered at high temperature (1350℃) and ultra high pressure (5GPa). The phase structure and mechanical properties of the sintered material were investigated by TEM, SEM, XRD and the measurements of impact toughness and G ratio. The results showed that the amount of t ZrO₂ in the sintered material increases with boiling hydrolysis time during ZrO₂ powder preparation. 100% t ZrO₂ was obtained and the particle size distribution is homogeneous on the SiC bonded phase with the boiling hydrolysis time more than 50hr. More than 20vol% of t ZrO₂ is transformed to m ZrO₂ during the fracture process. The SiC/ diamond composite has a combination property of high impact toughness and high G ratio.
- ZrO₂