Preparation of superfine WC-Co cemented carbides by spark plasma sintering process
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摘要: 采用放電等離子燒結(SPS)技術制備了超細WC-10Co硬質合金.研究了燒結溫度及燒結氣氛對WC-Co硬質合金組織及性能的影響.研究發現:燒結體密度隨燒結溫度的升高而增大,但由于鈷的蒸發,合金的成分偏離了原粉末的成分,且隨著燒結溫度的升高及爐內氣壓的降低,鈷的蒸發速率加大.因此,通過提高爐內氣壓,可以使合金的成分基本接近原粉末成分,降低了合金的成分偏離.結果表明:爐內氣壓升高到200 Pa,燒結壓力為30 MPa時,在1250℃燒結WC-10.07Co粉末5 min,燒結體中鈷的質量分數可以控制在10.02%,密度和硬度分別達到了14.62 g·cm-3和HRA 92.4.
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關鍵詞:
- 硬質合金 /
- 放電等離子燒結(sps) /
- 燒結氣氛 /
- 碳化鎢 /
- 鈷
Abstract: Spark plasma sintering (SPS) process was used to prepare superfine WC-10Co cemented carbides. The effects of sintering temperature and sintering atmosphere on the microstructure and properties of WC-Co cemented carbides were investigated. The results show that the density of the compacts increases with increasing sintering temperature. However the composition of the compacts is different from that of the starting powders because of the evaporation of Co, and the evaporation rate of Co increases with the increase in sintering temperature and the decrease in atmosphere pressure. It is found that the composition of the compacts can be very close to that of the starting powders by increasing the atmosphere pressure. The mass fraction of Co in the compacts sintered at 1 250℃ for 5min under 30MPa in the argon atmosphere of 200Pa is 10.02%, and the density and hardness are 14.62g·cm-3 and HRA 92.4, respectively.-
Key words:
- hard alloy /
- spark plasma sintering(SPS) /
- sintering atmosphere /
- tungsten carbide /
- cobalt
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