| 引用本文: | 李玲,陈卓,方华婵,朱佳敏.微米级短碳纤维/铜基复合材料组织和摩擦性能研究[J].材料科学与工艺,2021,29(5):48-56.DOI:10.11951/j.issn.1005-0299.20210031. |
| LI Ling,CHEN Zhuo,FANG Huachan,ZHU Jiamin.Microstructure and friction properties of micron short carbon fiber/copper matrix composites[J].Materials Science and Technology,2021,29(5):48-56.DOI:10.11951/j.issn.1005-0299.20210031. |
|
| 摘要: |
| 以电解铜粉和酚醛树脂包覆的毫米级短碳纤维为原料,通过球磨—冷压—加压烧结制备了微米级短碳纤维/铜复合材料,研究了短碳纤维长度和分散程度对材料力学和摩擦性能的影响。结果表明:球磨工艺可有效缩短碳纤维长度,制备均匀分散且长度均匀(20~40 μm)的微米级碳纤维,进而保证了材料在摩擦过程中可连续产生均匀细小的碳颗粒以阻碍材料的黏着,改善材料的摩擦稳定性和耐磨性。球磨时间不足时,短碳纤维长度差异大且局部存在纤维缠结,摩擦过程中富铜区黏着加剧,易产生片状脱落,磨损较大(2.32×10-4 mm3/(m·N))；球磨时间过长时,短碳纤维损伤严重,产生大量碳颗粒与短碳纤维共存,过多的碳铜界面和缺陷促进了材料摩擦过程中疲劳损伤导致的大量剥层磨损,耐磨性降低；球磨3 h制备的复合材料综合性能较好,弯曲强度和体积磨损率达到332.9 MPa和1.00×10-4 mm3/(m·N),摩擦系数波动范围宽度约为0.083 4。 |
| 关键词: 微米级碳纤维 碳纤维/铜复合材料 球磨 摩擦系数 体积磨损率 |
| DOI：10.11951/j.issn.1005-0299.20210031 |
| 分类号:TB333 |
| 文献标识码:A |
| 基金项目:国家重点研发计划资助项目(2016YFB0301403). |
|
| Microstructure and friction properties of micron short carbon fiber/copper matrix composites |
|
LI Ling1,CHEN Zhuo2,FANG Huachan2,ZHU Jiamin2
|
|
(1.School of Mechatronics Engineering, Central South University of Forestry and Technology, Changsha 410083, China; 2.Powder Metallurgy Research Institute, Central South University, Changsha 410083, China)
|
| Abstract: |
| Taking electrolytic copper powder and millimeter-scale short carbon fibers coated with phenolic resin as raw materials, micron short carbon fiber/copper composites were prepared by ball milling, cold pressing, and pressure-sintering. The effects of the length and dispersion degree of the short carbon fibers on the mechanical properties and friction properties of the composites were studied. Results show that the ball milling process could effectively shorten the length of carbon fibers and produce uniformly dispersed micron carbon fibers with uniform length (20~40 μm), which ensured that uniform and fine carbon particles could be produced continuously during the friction process to hinder the adhesion of the material and improve the friction stability and wear resistance of the material. With the lack of ball milling time, a large difference in the length of carbon fiber and local fiber entanglement intensified the adhesion of the copper-rich zone during friction, which was prone to flake shedding and caused severe wear (2.32×10-4 mm3/(m·N)). Excessive ball milling time led to serious damage of short carbon fibers, and a large number of carbon particles were generated, which coexisted with the short carbon fibers. The excessive carbon-copper interface and defects promoted large amounts of flake shedding related to fatigue damage in the process of friction, and the wear resistance became worse. The composites prepared by ball milling for 3 h had good comprehensive properties, the flexural strength and volumetric wear rate of the composites reached 332.9 MPa and 1.00×10-4 mm3/(m·N), and the fluctuation range of friction coefficient was about 0.083 4. |
| Key words: micron carbon fibers carbon fiber/copper composite ball milling friction coefficient volumetric wear rate |
