肖代红,申婷婷,欧小琴,宋旼,贺跃辉

• 1:中南大学粉末冶金国家重点实验室

摘要(Abstract)：

通过球磨与低压烧结方法,制备了超细晶WC-10Co合金。采用X射线衍射、扫描电镜和断裂韧性测试,研究了LaB6掺杂对超细晶WC-10Co合金的组织与断裂韧性影响。结果表明,掺杂微量LaB6,能明显提高烧结体合金的致密度,减少合金中WC晶粒的异常长大及烧结过程中Co3W3C相的形成,合金的断裂韧性最终得以提高。1450℃烧结后,掺杂1%LaB6合金的断裂韧性从7.3 MPa.m1/2提高到12.3 MPa.m1/2。

关键词(KeyWords)： 超细晶WC-10Co合金;硼化镧;显微组织;断裂韧性

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(50823006,50825102,50721003);; 湖南省自然科学基金(10JJ6066);; 湖南省科技计划专项(2009RS3025)

作者(Author): 肖代红,申婷婷,欧小琴,宋旼,贺跃辉

DOI: 10.13289/j.issn.1009-6264.2011.06.007

参考文献(References)：

• [1]Berger S,Porat R,Rosen R.Nanocrystalline materials:a study of WC-based hard metals[J].Prog Mater Sci,1997,42(3):311-320.
• [2]Fang Z Zak,Wang Xu,Ryu Taegong,et al.Synthesis,sintering,and mechanical properties of nanocrystalline cemented tungsten carbide-A review[J].Int J Refract Met Hard Mater,2009,27(2):288-299.
• [3]张立,陈述,刘刚,等.高性能超细、纳米硬质合金及其制备过程中的关键技术问题[J].材料导报,2005,19(11):4-9.Zhang Li,Chen Shu,Liu Gang,et al.Ultrafine and nano-structured cemented carbide with high properties and the key issues in its preparation[J].Materials Review,2005,19(11):4-9.
• [4]Azcona I,Ordóez A,Sánchez J M,et al.Hot isostatic pressing of ultrafine tungsten carbide-cobalt hardmetals[J].J Mater Sci,2002,37(19):4189-4195.
• [5]Sivaprahasam D,Chandrasekar S B,Sundaresan R.Microstructure and mechanical properties of nanocrystalline WC-12Co consolidated by spark plasmasintering[J].Int J Refract Metal Hard Mater,2007,25(2):144-52.
• [6]赵海锋,朱丽慧,黄清伟.放电等离子技术快速烧结纳米WC-10%Co-0.8%VC硬质合金[J].稀有金属材料与工程,2005,34(1):82-85.Zhao Hai-feng,Zhu Li-hui,Huang Qing-wei.Nanocrystalline WC-10%Co-0.8%VC cemented carbides prepared by spark plasma sintering[J].RareMetal Mater Eng,2005,34(1):82-85.
• [7]周健,程吉平.微波烧结WC-Co细晶硬质合金工艺与性能[J].中国有色金属学报,1999,9(3):464-468.Zhou Jian,Chen Ji-ping.Property and technology of WC-Co fine grain cemented carbide in microwave sintering[J].The Chinese Journal ofNonferrous Metals,1999,9(3):464-468.
• [8]Kim B K,Ha G H,Lee G G,et al.Structure and properties of nanophase WC/Co/VC/TaC hardmetal[J].Nanostruct Mater,1997,9(1-8):233-236.
• [9]Huang S G,Liu R L,Li L,et al.NbC as grain growth inhibitor and carbide in WC-Co hard metals[J].Int J Refract Met Hard Mater,2008,26(5):389-95.
• [10]Xiao D H,He Y H,Song M,et al.Y2O3-and NbC-doped ultrafine WC-10Co alloys by low pressure sintering[J].Int J Refract Met Hard Mater,2010,2010,28(3):407-411.
• [11]肖代红,贺跃辉,宋旼,等.超细晶WC-10Co-VC-NbC硬质合金的组织与性能研究[J].材料热处理学报,2010,31(10):26-29.Xiao Dai-hong,He Yue-hui,Song Min,et al.Microstructure and mechanical properties of ultrafine WC-10-Co-VC-NbC alloy cemented carbide[J].Transaction of Materials and Heat Treatment,2010,31(10):26-29.
• [12]Lee H R,Kim D J,Hwang N M,et al.Role of vanadium carbide additive during sintering of WC-Co:mechanism of grain growth inhibition[J].J AmCeram Soc,2003,86(1):152-154.
• [13]肖代红,申婷婷,欧小琴,等.一种超细晶碳化钨/钴系硬质合金及其制备方法:中国,2010052700337370[P].2010-05-16.
• [14]Williamson G K,Hall W H.X-ray broadening from filed aluminum and wolfram[J].Acta Metall,1953,1:22-31.
• [15]Schubert W D,Neumeister H,Kinger G,et al.Hardness to toughness relationship of fine-grained WC-Co hardmetals[J].Int J Refract Met HardMater,1998,16(2):133-142.
• [16]Reynen P,Firatli A C.Sintering of multiphase ceramics[J].Materials Science Monographs,1982,14:209-218.

文章评论(Comment)：