贾磊,岳明娟,王琛,谢辉,吕振林.机械合金化结合热压烧结制备(TiC+TiB2)/Cu复合材料[J].稀有金属材料与工程,2018,47(5):1567~1572.[Jia Lei,Yue Ming-juan,Wang Chen,Xie Hui,Lu Zhen-lin.Preparation and Properties of (TiC+TiB2)/Cu Composites by Mechanical Alloying and Hot-press sintering[J].Rare Metal Materials and Engineering,2018,47(5):1567~1572.]
机械合金化结合热压烧结制备(TiC+TiB2)/Cu复合材料
投稿时间:2016-04-07  修订日期:2016-08-24
中文关键词:  机械合金化  热压烧结  (TiC+TiB2)/Cu复合材料  导电率和硬度
基金项目:国家自然科学基金资助(51601143/U1502274); 陕西省电工材料与熔渗技术重点科技创新团队(2012KCT-25);西安市科技局技术转移促进计划项目(CXY1438(2));陕西省自然科学基础研究计划项目(2014JM2-5042);
中文摘要:
      本文通过对Ti-B4C体系进行机械合金化,随后将其与Cu粉进行混合和热压烧结制备了(TiC+TiB2)/Cu复合材料。研究表明,机械合金化促使B4C粉末分解并向Ti粉末中的固溶形成Ti-C-B的三元混合体系,有效降低了Ti-B4C体系的反应温度,并在随后的热压烧结中生成(TiC+TiB2),其原因是在Ti-C-B体系中生成TiB2相比TiB具有更低的吉布斯自由能变。当增强相含量较低时,强化相颗粒细小弥散地分布在铜基体中,且与基体界面结合良好,可显著提高复合材料的硬度;但随着含量的增加,强化相的团聚现象加剧,与基体的界面结合方式也转变为简单的机械包裹,其强化效应并不能得以体现。此外,由于机械合金化提高了Ti-B4C体系反应的活性,有效地避免了Ti向铜基体中的固溶,导致所制备的(TiC+TiB2)/Cu复合材料与直接混合Cu-Ti-B4C粉末制备的复合材料相比导电率大幅提升。
Preparation and Properties of (TiC+TiB2)/Cu Composites by Mechanical Alloying and Hot-press sintering
英文关键词:Mechanical alloying  Hot-press sintering  (TiC+TiB2)/Cu composites  Electrical conductivity and hardness
英文摘要:
      In this paper, (TiC+TiB2)/Cu composites are successfully prepared by mixing and hot-press sintering of Cu powder with mechanical alloyed Ti-B4C powder mixture. Results show that, mechanical alloying can ensure the decomposition and solution of B4C in to Ti powder, and thus form a solution of ternary Ti-C-B system. As a result, on-set temperature of Ti-B4C in-situ reaction is decreased and reaction products are TiC+TiB2, because that the formation of TiB2 has lower Gibbs free energy change than that of TiB. When the content is low, reinforcements presents to be small and well-dispersed particles in Cu matrix, and the reinforcements and matrix is well combined, resulting in significant improvements on hardness of composites. With the content increases, reinforcements aggregate seriously, and the interface transfers to be simple mechamical package. When the designed content of reinforcements is 15vol.%, the electrical conductivity of prepared (TiC+TiB2)/Cu composites is 47.1%IACS, much higher than composites prepared from non-milled Cu-Ti-B4C mixture (12.46%IACS), suggesting that mechanical alloying can accelerate reaction between Ti-B4C while prevent solution of Ti into Cu matrix.
作者单位E-mail
贾磊 西安理工大学材料科学与工程学院 xautjialei@163.com 
岳明娟 西安理工大学材料科学与工程学院  
王琛 西安职业技术学院  
谢辉 西安航空学院  
吕振林 西安理工大学材料学院  
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