Effect of Cr coating on microstructure and properties of graphite flake/Cu composites
-
摘要: 通过盐浴镀覆在石墨鳞片表面镀铬，随后采用真空热压烧结技术制备了镀铬石墨鳞片/铜复合材料，研究了铬镀层的表面形貌和物相组成，并分析了铬镀层对石墨鳞片/铜复合材料显微结构和性能的影响。结果表明，盐浴镀铬层主要由Cr3C2和Cr7C3组成，经热压烧结后Cr7C3与石墨反应生成了Cr3C2；石墨鳞片表面镀铬可以明显减少石墨鳞片/铜复合材料界面处的孔隙，提高复合材料的热导率和抗弯强度，与未镀覆的复合材料相比，当镀铬石墨鳞片的体积分数为60%时，复合材料平面热导率相从594 W·m-1·K-1提高至625 W·m-1·K-1，抗弯强度提升65%。Abstract: Cr coating was successfully deposited on the graphite flake surface by salt bath plating, and then the Cr-coated graphite flake/Cu composites were prepared by vacuum hot pressing. The morphology and phase composition of Cr coating were studied, and the effects of Cr coating on the microstructure and properties of graphite flake/Cu composites were analyzed, including interface structure, thermal conductivity, and bending strength. The results indicate that the Cr coating synthesized by salt bath plating is mainly composed of Cr3C2 and Cr7C3, however, Cr7C3 is reacted with graphite to form Cr3C2 during vacuum hot pressing sintering. Cr coating deposited on the graphite flake surface can evidently reduce the pores and gaps in the interface, resulting in an improvement on the thermal conductivity and bending strength. Compared with the uncoated graphite flake/Cu composites, the thermal conductivity of Cr-coated composites increases from 594 W·m-1·K-1 to 625 W·m-1·K-1 when the Cr-coated graphite flakes content is 60% by volume, and the bending strength is increased by 58%.
-
Key words:
- salt bath plating /
- graphite flake /
- composites /
- microstructure /
- mechanical properties
-
图 1 石墨鳞片显微形貌和表面铬元素分布：（a）原始石墨鳞片；（b）镀铬石墨鳞片；（c）镀铬石墨鳞片表面铬元素分布
Figure 1. SEM images and Cr element distribution of graphite flakes: (a) raw graphite flakes; (b) Cr-coated graphite flakes; (c) element distribution of Cr-coated composites
图 2 原始石墨鳞片（a）和镀铬石墨鳞片（b）原子力显微形貌
Figure 2. AFM images of the raw graphite flakes (a) and Cr-coated graphite flakes (b)
图 4 镀铬石墨鳞片Cr2p的高分辨X射线光电子图谱
Figure 4. High-resolution XPS spectrum of Cr2p for the Cr-coated graphite flakes
图 5 含不同体积分数镀铬石墨鳞片的铜复合材料扫描电子显微形貌：（a）30%；（b）40%；（c）50%；（d）60%
Figure 5. SEM images of Cr-coated graphite flake/Cu composites in different volume fractions of graphite flakes: (a) 30%; (b) 40%; (c) 50%; (d) 60%
图 6 未镀铬和镀铬石墨鳞片/铜复合材料的X射线衍射图谱
Figure 6. XRD patterns of uncoated and Cr-coated graphite flake/Cu composites
图 7 石墨鳞片/铜复合材料的界面形貌及元素分布：（a）未镀覆形貌；（b）镀铬形貌；（c）镀铬复合材料界面处的元素面分布
Figure 7. Interface morphology and element distribution of graphite flake/Cu composites: (a) uncoated graphite flake/Cu composites; (b) Cr-coated graphite flake/Cu composites; (c) element distribution of Cr-coated composites
图 8 含不同体积分数石墨鳞片的铜基复合材料的热导率
Figure 8. Thermal conductivity of graphite flake/Cu composites in different volume fractions of graphite flakes
图 9 含不同体积分数石墨鳞片的铜基复合材料抗弯强度
Figure 9. Bending strength of graphite flake/Cu composites in different volume fractions of graphite flakes
图 10 石墨鳞片/铜复合材料的断口形貌：（a）未镀覆；（b）镀铬
Figure 10. Fracture surface of graphite flake/Cu composites: (a) uncoated composites; (b) Cr-coated composites
-
[1] Cui W, Ren S B, Xu H, et al. Research on preparation technology for porous diamond preform to vacuum pressure infiltration. Powder Metall Technol, 2016, 34(2): 125 doi: 10.3969/j.issn.1001-3784.2016.02.009崔巍, 任淑彬, 许慧, 等. 熔渗用多孔金刚石预制坯制备工艺的研究. 粉末冶金技术, 2016, 34(2): 125 doi: 10.3969/j.issn.1001-3784.2016.02.009 [2] Chen H, Jia C C, Chu K, et al. Research on increasing thermal conductivity of diamond/copper composites by improving the interface condition. Powder Metall Technol, 2010, 28(2): 143 http://pmt.ustb.edu.cn/article/id/fmyjjs201002014陈惠, 贾成厂, 褚克, 等. 通过改善界面状态提高金刚石-Cu复合材料导热性的研究. 粉末冶金技术, 2010, 28(2): 143 http://pmt.ustb.edu.cn/article/id/fmyjjs201002014 [3] Chu K, Wang X H, Wang F, et al. Largely enhanced thermal conductivity of graphene/copper composites with highly aligned graphene network. Carbon, 2018, 127: 102 doi: 10.1016/j.carbon.2017.10.099 [4] Zhang L M, Chen W S, Luo G Q, et al. Low-temperature densification and excellent thermal properties of W–Cu thermal-management composites prepared from copper-coated tungsten powders. J Alloys Compd, 2014, 588: 49 doi: 10.1016/j.jallcom.2013.11.003 [5] Chen G Q, Yang W S, Dong R H, et al. Interfacial microstructure and its effect on thermal conductivity of SiCp/Cu composites. Mater Des, 2014, 63: 109 doi: 10.1016/j.matdes.2014.05.068 [6] Yang L, Sun L, Bai W W, et al. Thermal conductivity of Cu-Ti/diamond composites via spark plasma sintering. Diamond Relat Mater, 2019, 94: 37 doi: 10.1016/j.diamond.2019.02.014 [7] Yuan M Y, Tan Z Q, Fan G L, et al. Theoretical modelling for interface design and thermal conductivity prediction in diamond/Cu composites. Diamond Relat Mater, 2018, 81: 38 doi: 10.1016/j.diamond.2017.11.010 [8] Wang L H, Li J W, Bai G Z, et al. Interfacial structure evolution and thermal conductivity of Cu-Zr/diamond composites prepared by gas pressure infiltration. J Alloys Compd, 2019, 781: 800 doi: 10.1016/j.jallcom.2018.12.053 [9] Zhou C, Ji G, Chen Z, et al. Fabrication, interface characterization and modeling of oriented graphite flakes/Si/Al composites for thermal management applications. Mater Des, 2014, 63: 719 doi: 10.1016/j.matdes.2014.07.009 [10] Bai H N, Xue C, Lyu J L, et al. Thermal conductivity and mechanical properties of flake graphite/copper composite with a boron carbide-boron nano-layer on graphite surface. Composites Part A, 2018, 106: 42 doi: 10.1016/j.compositesa.2017.11.019 [11] Ren S B, Chen J H, He X B, et al. Effect of matrix-alloying-element chromium on the microstructure and properties of graphite flakes/copper composites fabricated by hot pressing sintering. Carbon, 2018, 127: 412 doi: 10.1016/j.carbon.2017.11.033 [12] Liu N, Huang Y P, Liu H Y, et al. High thermal-conductivity diamond/Cu composites fabricated by infiltration. Powder Metall Technol, 2014, 32(1): 59 doi: 10.3969/j.issn.1001-3784.2014.01.011刘楠, 黄愿平, 刘海彦, 等. 熔渗法制备高导热金刚石/Cu复合材料. 粉末冶金技术, 2014, 32(1): 59 doi: 10.3969/j.issn.1001-3784.2014.01.011 [13] Zhu Y B, Bai H, Xue C, et al. Thermal conductivity and mechanical properties of a flake graphite/Cu composite with a silicon nano-layer on a graphite surface. RSC Adv, 2016, 100(6): 98190 http://smartsearch.nstl.gov.cn/paper_detail.html?id=addccdb22770b666085b2ccaabfb737f [14] Wu Q, Jia C C, Nie J H. Friction and wear properties of magnesium matrix composites reinforced by tungsten-coated carbon nanotubes. Powder Metall Technol, 2018, 36(6): 423 https://www.cnki.com.cn/Article/CJFDTOTAL-FMYJ201806004.htm吴琼, 贾成厂, 聂俊辉. 镀钨碳纳米管增强镁基复合材料的摩擦磨损性能研究. 粉末冶金技术, 2018, 36(6): 423 https://www.cnki.com.cn/Article/CJFDTOTAL-FMYJ201806004.htm [15] Detroye M, Reniers F, Buess-Herman C, et al. AES-XPS study of chromium carbides and chromium iron carbides. Appl Surf Sci, 1999, 144-145: 78 doi: 10.1016/S0169-4332(98)00769-7 [16] Castillejo F E, Marulanda D M, Olaya J J, et al. Wear and corrosion resistance of niobium-chromium carbide coatings on AISI D2 produced through TRD. Surf Coat Technol, 2014, 254: 104 doi: 10.1016/j.surfcoat.2014.05.069 [17] Xue C, Bai H, Tao P F, et al. Thermal conductivity and mechanical properties of flake graphite/Al composite with a SiC nano-layer on graphite surface. Mater Des, 2016, 108: 250 doi: 10.1016/j.matdes.2016.06.122 [18] Zhang R, He X B, Chen Z, et al. Influence of Ti content on the microstructure and properties of graphite flake/Cu-Ti composites fabricated by vacuum hot pressing. Vacuum, 2017, 141: 265 doi: 10.1016/j.vacuum.2017.04.026 -
下载:
点击查看大图
计量
- 文章访问数: 297
- HTML全文浏览量: 52
- PDF下载量: 15
- 被引次数: 0
