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无机材料学报

无机材料学报

• 研究论文 • 上一篇    下一篇

B4C超细粉末的制备及烧结

尹邦跃; 王零森; 方寅初   

  1. 中南大学粉末冶金国家重点实验室 长沙 410083
  • 收稿日期:2001-02-20 修回日期:2001-04-13 出版日期:2002-03-20 网络出版日期:2002-03-20

Preparation and Sintering of Ultrafine B4C Powders

YIN Bang-Yue; WANG Ling-Sen; FANG Yan-Chu   

  1. State Key Laboratory for Powder Metallurgy; Central South University; Changsha 410083; China
  • Received:2001-02-20 Revised:2001-04-13 Published:2002-03-20 Online:2002-03-20

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摘要： 采用气流粉碎对Ｂ４Ｃ粗粉（比表面积０．５２ｍ２／ｇ，中位粒径２０．４μｍ）进行了一系列粉碎实验，研究了气流粉碎次数、成形压力和烧结温度对烧结密度的影响．结果表明，当粉碎次数达到３次后，可获得＜１μｍ的Ｂ４Ｃ超细粉末．经过４次气流粉碎的Ｂ４Ｃ超细粉末的比表面积为２．５３ｍ２／ｇ，中位粒径为０．５６μｍ；粉末分别于２２００和２２５０℃压烧结１ｈ，其烧结密度分别达到理论密度的７８．６％和８２．５％，平均晶粒尺寸分别为２８和５０μｍ抗压强度分别为３９０和５５５ＭＰａ．

关键词: 碳化硼, 超细粉末, 气流粉碎, 无压烧结

Abstract: A series of jet-milling experiments on B4C coarse powders with specific surface area of 0.52m^2/g and median particle size of 20.4μm were carried out. Effects
of jet-milling times, forming stress and sintering temperature on sintered densities of B4C were also studied. The results show that powders with particle size of less than 1μm can be
obtained when jet-milled for more than 3 times. The powders jet-milled for 4 times, with specific surface area of 2.53m2/g and median particle size of 0.56μm,
can be pressureless sintered to 78.6% TD at 2200℃and 82.5% TD at 2250℃ for 1h, with average grain size of 28μm and 50μm, comprasive strength of
390MPa and 555MPa respectively.

Key words: boron carbide, ultrafine powder, jet milling, pressureless sintering

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