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| TiB2含量对TiB2/石墨-铜复合材料微观组织和摩擦性能的影响 |
| Effect of TiB2 Content on Microstructure and Friction Properties of TiB2/Graphite-copper Composites |
| Received:August 22, 2024 |
| DOI：10.3969/j.issn.1674-6457.2025.04.018 |
| 中文关键词: TiB2颗粒 火花等离子烧结(SPS) TiB2/铜-石墨复合材料 微观组织 摩擦性能 |
| 英文关键词: TiB2 particles spark plasma sintering (SPS) TiB2/copper-graphite composites microstructure friction properties |
| 基金项目:国家自然科学基金(51705416) |
| Author Name | Affiliation | | ZHONG Bin | School of Mechanical Engineering, Xi'an University of Science and Technology, Xi'an 710054, China | | WANG Yuanlong | School of Mechanical Engineering, Xi'an University of Science and Technology, Xi'an 710054, China | | YU Zhengyang | School of Mechanical Engineering, Xi'an University of Science and Technology, Xi'an 710054, China | | LI Fei | School of Mechanical Engineering, Xi'an University of Science and Technology, Xi'an 710054, China | | DING Chun | School of Mechanical Engineering, Xi'an University of Science and Technology, Xi'an 710054, China |
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| 中文摘要: |
| 目的 针对铜基石墨复合材料强度低、界面结合弱等问题，采用TiB2陶瓷颗粒作为增强体以改善基体缺陷并提高复合材料的综合性能。方法 以8%(质量分数)镀铜石墨粉、纯度99.99%电解铜粉和TiB2陶瓷颗粒为原料，采用火花等离子烧结法(SPS)制备了TiB2/铜-石墨复合材料。利用扫描电子显微镜、EDS能谱仪和摩擦磨损试验机对TiB2/铜-石墨复合材料进行分析，系统研究了不同TiB2含量对TiB2/石墨-铜复合材料微观组织和摩擦性能的影响。结果 TiB2在铜-石墨复合材料基体中的分布相对均匀，与铜基体形成致密结合。随TiB2含量的增加，复合材料的显微硬度持续增加，密度先增大后减小，电阻率先减小后增大。当TiB2添加量为1.5%(质量分数)时，密度达到最大值8.02 g/cm3，电阻值达到最小值0.024 μΩ.m。当TiB2添加量为4.5%~6%(质量分数)时，TiB2/铜-石墨复合材料耐磨性能显著提高，磨损率达到最低值1×10−6 mm3/(N.m)，与铜-石墨复合材料相比，降低了57%。结论 TiB2陶瓷颗粒可有效改善基体缺陷、提高复合材料的综合性能。通过微观形貌分析可知，复合材料的磨损机制主要为磨粒磨损，并伴随轻微剥层磨损和氧化磨损。 |
| 英文摘要: |
| The work aims to address the problems of low strength and weak interfacial bonding in copper-based graphite composites with TiB2 ceramic particles as reinforcement to deal with matrix defects and enhance the overall performance of the composites. TiB2/copper-graphite composites were prepared by spark plasma sintering (SPS) with 8 wt.% copper-plated graphite powder, 99.99% purity electrolytic copper powder and TiB2 ceramic particles as raw materials. The TiB2/copper-graphite composites were analyzed by scanning electron microscope, EDS spectrometer and friction wear tester, and the effects of different TiB2 contents on the microstructure and friction properties of TiB2/graphite- copper composites were systematically investigated. The distribution of TiB2 in the Cu-graphite composite matrix was relatively uniform, forming a dense bond with the Cu matrix. With the increase of TiB2 content, the microhardness of the composites continued to increase; The density first increased and then decreased, reaching a maximum value of 8.02 g/cm3 at 1.5wt.% TiB2 addition; The resistivity first decreased and then increased, reaching a minimum value of 0.024 μΩ.m at 1.5wt.% TiB2 addition; At TiB2 addition of 4.5%-6%, the wear resistance of the TiB2/copper- graphite composites was significantly improved, and the wear rate reached a minimum value of 1×10−6 mm3/(N.m), which was 57% lower compared with that of Cu-graphite composites. TiB2 ceramic particles can effectively eliminate the matrix defects and improve the comprehensive performance of composites. Through the micro-morphological analysis, it can be seen that the wear mechanism of the composites is mainly abrasive wear, accompanied by a slight delamination wear and oxidative wear together with the mixed wear mechanism. |
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