| 鲍贤勇,张峰,鲁忠臣,曾美琴,朱敏.低压烧结温度对一步法制备超细晶WC-Co基硬质合金组织及性能的影响[J].材料导报,2017,31(16):65-71 |
| 低压烧结温度对一步法制备超细晶WC-Co基硬质合金组织及性能的影响 |
| Effect of Low Pressure Sintering Temperature on Microstructure and Mechanical Performance of Ultrafine WC-Co Based Hard Metals Prepared by One-step Method |
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| DOI：10.11896/j.issn.1005-023X.2017.016.014 |
| 中文关键词: 等离子球磨 碳化烧结一步法 低压烧结 烧结温度 力学性能 |
| 英文关键词: plasma milling, carbonizing and sintering by one-step, low pressure sintering, sintering temperature, mechanical performance |
| 基金项目:鲍贤勇:男,1974年生,博士研究生,研究方向为高性能硬质合金及金属陶瓷等 E-mail:baoxy@fiyta.com.cn 朱敏:男,1962年生,教授,博士研究生导师,研究方向为高性能纳米金属材料等 E-mail:memzhu@scut.edu.cn |
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| 中文摘要: |
| 采用等离子球磨技术制得W-C-10Co-0.9VC-0.3Cr3C2纳米复合粉体,并利用单向模压成型法将其压制成生坯,再经低压烧结一步法制备成硬质合金。研究表明,等离子球磨3 h所获得的复合粉体呈片层状形貌,并且成分分布均匀。在1 380 ℃及1 400 ℃烧结时,由于等离子球磨的特殊作用,VC、Cr3C2对WC晶粒长大抑制作用突显。1 380 ℃烧结制备的硬质合金,致密度为99.2%,WC平均晶粒尺寸为250 nm,硬度和横向断裂强度分别为92.3HRA和2 443 MPa,具有最佳的WC晶粒尺寸与致密度配合,以及最佳的综合力学性能。 |
| 英文摘要: |
| W-C-10Co-0.9VC-0.3Cr3C2 nano composite powders were prepared by plasma milling (P-milling), and subsequently compressed into green compacts with a uniaxial pressure, then the green compacts were carbonized and sintered in a one-step me-thod by low pressure sintering technology. The analysis results indicate that the homogeneous and lamellar structure composite powder is achieved by P-milling for 3 h. Due to the special effect of P-milling, VC and Cr3C2 begin to play a role of inhibition to WC grain size at the temperature of 1 380 ℃ and 1 400 ℃. Among them, the hard metals that sintered at 1 380 ℃ exhibit the optimum combination of WC grain size and relative density, and the best mechanical performance simultaneously. The density of hard metal is 99.2% with 250 nm of mean WC grain size, and the hardness and transverse rupture strength reach up to 92.3HRA and 2 443 MPa, respectively. |
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