摘要
采用放电等离子烧结 (SPS)和普通真空烧结两种烧结工艺烧结 92WC - 8Co纳米硬质合金。放电等离子烧结 ,在 115 0℃的烧结温度、4.5kN压力下保温 5min ,烧结体就完全致密 ,其合金中的WC晶粒度小于 2 0 0nm ,硬度可达到 94.2HRA。真空烧结达到完全致密 ,烧结温度需 140 0℃ ,保温时间 30min ,WC晶粒度为 (30 0 40 0 )nm ,硬度最高为 93HRA。结果表明 :放电等离子烧结硬质合金的温度显著降低 ,烧结时间大大缩短 ,有效地抑制了WC晶粒的长大。SPS还显著降低微孔等缺陷 ,制品性能也大大提高。
WC-8Co nano-grained cemented carbide was respectively sintered by Spark Plasma Sintering and normal vacuum sinter processes. Complete densification samples with 200nm WC grains and 94.2HRA hardness were made by Spark Plasma Sintering at 1150℃ and under 4.5kN for 5 minutes. Vacuum sintering was processed at 1400℃ for 30 minutes, as a consequence samples with 300-400 nm WC grains and 93 HRA hardness. The results show that sintering temperature can be greatly decreased by SPS, sintering time was largely shorted and WC grain growth was effectively inhibited. Microspores and drawbacks in nano-grained cemented carbide made by SPS are greatly declined, so that the properties are improved.
出处
《硬质合金》
CAS
2003年第3期138-142,共5页
Cemented Carbides
基金
上海市科委基金 (0 15 2nm0 46 )资助项目
