材料工程2024，Vol.52Issue(8)：178-188,11.DOI:10.11868/j.issn.1001-4381.2022.000721
TiC含量对SPS制备TiC/Cu复合材料力学与摩擦学性能的影响
Effect of TiC content on mechanical and tribological properties of TiC/Cu composites prepared by SPS
摘要
Abstract
Copper matrix composites reinforced with different mass fractions of TiC particles were prepared by spark plasma sintering (SPS) technology. The microstructures of the copper matrix composites with different sintering temperatures and TiC contents were investigated. The effects of TiC content on the electrical conductivity,nano-mechanical properties,microhardness,tensile properties,and tribological behaviors of the composites were studied. Results show that the TiC/Cu composites obtained by sintering at 850 ℃ have a dense structure,with a good bonding between the reinforcements and the matrix. On the one hand,as the TiC content increases,the grains of the copper matrix phase in the TiC/Cu composites are continuously refined and the grain boundary density increases. This leads to an increase in the hardness and yield strength of the composites. On the other hand,the increase in TiC content gradually leads to the development of pores and cracks at the bonding interface between the reinforcement and matrix. When bearing or transmitting load,the pores and cracks will become the preferred location for stressconcentration and crack formation,resulting in a reduction in the conductivity,tensile strength,and elongation of the composite. With TiC content of 5％-15％(mass fraction,the same below),the composites have higher tensile strength,modulus of elasticity and yield strength,appropriate hardness,and better overall mechanical properties. When the TiC content exceeds 20％,the yield strength of TiC/Cu composites decreases significantly and the composite fracture mechanism changes from ductile fracture to brittle fracture. The TiC reinforcements significantly improve the tribological properties of the copper matrix composites. The friction coefficient and wear of the composites during friction increase linearly with increasing load and tend to decrease with increasing TiC content. At a TiC content of 20％,the composite has the highest wear resistance and lowest coefficient of friction. The wear mechanism is dominated by abrasive wear,accompanied by slight adhesive wear and oxidative wear.关键词
铜基复合材料/放电等离子烧结/微观结构/力学性能/摩擦学行为Key words
copper matrix composites/spark plasma sintering/microstructure/mechanical property/tribological behavior分类
通用工业技术引用本文复制引用
李雪伍,陈朝鹏,尹艳丽,邢志国,于鹤龙..TiC含量对SPS制备TiC/Cu复合材料力学与摩擦学性能的影响[J].材料工程,2024,52(8):178-188,11.基金项目
国家自然科学基金项目(52075544,52275211) （52075544,52275211）
陕西省创新能力支撑计划科技新星项目(2021KJXX-38) （2021KJXX-38）
