放电等离子烧结Ni/TiB<sub>2</sub>-TiC复合材料微观组织及磨损性能

张新杰; 崔洪芝; 王明亮; 张国松; 王灿明; 宋强

doi:10.13801/j.cnki.fhclxb.20170821.007

放电等离子烧结Ni/TiB₂-TiC复合材料微观组织及磨损性能

山东科技大学材料科学与工程学院, 青岛 266590

基金项目: 国家863计划项目（2015AA034404）；山东省泰山学者攀登计划（tspd20161006）；山东省科技攻关项目（2014GGX102026）

详细信息

通讯作者:
崔洪芝,博士,教授,博士生导师,研究方向为等离子表面改性、陶瓷基复合材料,E-mail:cuihongzhi1965@163.com

中图分类号: TQ174
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出版历程
- 收稿日期: 2017-05-10
- 修回日期: 2017-08-16
- 刊出日期: 2018-01-14

Microstructure and wear properties of Ni/TiB₂-TiC composites prepared by spark plasma sintering

College of Materials Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, China

摘要

摘要: 采用放电等离子烧结技术，以Ni、Ti、B₄C混合粉末为原料制备Ni/TiB₂-TiC复合材料，分析了Ni含量对复合材料的物相组成、组织结构、硬度和耐磨性的影响。结果表明：Ni/TiB₂-TiC复合材料主要物相为γ-Ni、TiB₂和TiC，其中TiB₂呈矩形条状和多边形状，TiC则呈现不规则块状；随着原始粉末中Ni含量的增加，TiB₂和TiC陶瓷相尺寸减小，其在Ni粘结相中的分布呈现出均匀化的趋势，复合材料更加致密。Ni含量显著影响Ni/TiB₂-TiC复合材料的耐磨性和磨损机制，Ni含量较低时（20wt%和30wt%），复合材料摩擦系数（COF）较大且存在明显的波动，出现严重的疲劳磨损；随着Ni量的增加（40wt%），材料的COF降低且趋于平稳，表现为微切削磨损；当Ni含量持续增加时（50wt%），由于局部Ni的聚集导致粘着磨损产生，COF有所上升，耐磨性反而下降。
- 放电等离子烧结 /
- TiB₂-TiC /
- 复合材料 /
- 显微组织 /
- 耐磨性
Abstract: Ni/TiB₂-TiC composites were fabricated by spark plasma sintering using Ni, Ti and B₄C powder mixture as precursor. Effects of Ni content on phase composition, microstructure, microhardness and wear resistance of composites were analyzed. The results show that the mainly phases of Ni/TiB₂-TiC composites are γ-Ni, TiB₂ and TiC. TiB₂ phase presents rectangle strip and polygon shape, while TiC phase is irregular patch shape. With the increase of Ni content, the size of TiB₂ and TiC ceramics decrease gradually. Additionally, TiB₂ and TiC homogeneously disperse in the Ni binder phase, and the denser composites are obtained. Wear properties and mechanisms are influenced significantly by Ni content. When Ni content is low(20wt% and 30wt%), severe delaminate occurs with high and fluctuant coefficient of friction(COF). Micro-cutting wear appears with lower and smoother COF with the increase of Ni content(40wt%). However, when the Ni content continues to increase(50wt%), the adhesive wear results in poorer wear resisitance and higher COF due to the aggregation of Ni.
- spark plasma sintering /
- TiB₂-TiC /
- composite /
- microstructure /
- wear resistance

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