摘要
通过分析放电等离子烧结致密化过程，确定了致密化温度；研究了SPS烧结过程中压力对WC-Co硬质合金致密化、显微组织及性能的影响。结果表明，放电等离子烧结粉末在1130℃时，达到最大收缩率；烧结压力的增加，样品的致密度、硬度增加；断裂韧性的变化集中在11．5-12．1MPa·m1/2之间，和硬度的变化呈现相反的趋势；烧结压力相对较小时，样品WC晶粒较粗大且不均匀；在40MPa和55MPa时，晶粒相对较小且分布均匀。要得到高性能、高致密度的样品，合理的烧结温度在1200℃以上，烧结压力为40MPa。
By analyzing the spark plasma sintering process, the densification temperature of WC-Co cemented carbide was determined. The effect of sintering pressure on the densification, microstructure and properties of SPS WC-Co was investigated. The results indicates that the maximum shrinkage rate of sintering powder takes place at 1 130℃ by spark plasma sintering; the density and hardness of the samples increase with the increasing of the sintering pressure; the fracture toughness is concentrated in the range of 11.5 - 12.1 MP m1/2, which shows the opposite trend to hardness; when sintering pressure is relatively smaller, WC grain size of the samples is coarse and unevenly distributes; when sintering pressure is 40 MPa or 55 MPa, the grain is relatively small and evenly distributes. To get high performance, high density of the WC-Co sample, a reasonable sintering temperature is above 1 200 ℃, with sintering pressure is 40 MPa.
出处
《硬质合金》
CAS
2012年第1期19-23,共5页
Cemented Carbides
作者简介
孙兰（1977-）．讲师．研究方向：硬质合金及有色金属.E—mail：sunlan@scu．edu．cn
