摘要
研究了机械合金化制备的纳米晶WC-10Co复合粉末的真空烧结特征,分析了孔隙度、显微硬度与烧结时间和温度的关系,考察了改性ZrO2纳米粉体对烧结的作用。结果表明:在1325℃,15min的烧结条件下,样品的相对密度达到了98.6%;显微硬度随着烧结时间的延长和烧结温度的升高先增加后降低,在1325℃烧结15min条件下,合金的最大硬度为22950MPa;改性ZrO2纳米粉体既有利于晶粒长大的控制,同时又有利于材料致密化的进行,可以显著的提高烧结合金的性能。
The vacuum sintering behavior of nano-grained WC-10Co composite powders synthesized by mechanical alloy has been investigated. The porosity, the micro hardness of specimen dependence on the sintering time, the sintering temperatures were analyzed, and the effect of a new inhibitor was evaluated. The result show that relative density of 98.6% for specimen sintering at 1325℃, 15 min can be achieved; with the increment of sintering time or the promotion of sintering temperatures, the micro hardness of specimen first increased and after decreased, the highest micro hardness attained 22 950 MPa; the new inhibitor modified nanometer ZrO2 benefits both the inhibition of grain growth and the increment of density, and the performance of alloy with this inhibitor can be promoted vastly.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2005年第11期1703-1707,共5页
Rare Metal Materials and Engineering
基金
国家自然科学基金(50474049)
