石墨鳞片-碳纤维协同增强铜基复合材料的制备与热物理性能

黄焌晨; 缪国栋; 陈友明; 欧云; 郭世柏; 刘骞

doi:10.13801/j.cnki.fhclxb.20210513.006

石墨鳞片-碳纤维协同增强铜基复合材料的制备与热物理性能

doi: 10.13801/j.cnki.fhclxb.20210513.006

黄焌晨^{1, 2,},
缪国栋^2,,
陈友明^1,,
欧云^1,,
郭世柏^2,,
刘骞^{1, 2, ,}

1.
湖南科技大学　机械设备健康维护湖南省重点实验室，湘潭 411201
2.
湖南科技大学　材料科学与工程学院，湘潭 411201

基金项目: 国家自然科学基金(51704113)

详细信息

通讯作者:
刘骞，博士，副教授，硕士生导师，研究方向为金属基复合材料、高导热电子封装材料　E-mail：liuq@hnust.edu.cn

中图分类号: TB3333
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- 被引次数: 0
出版历程
- 收稿日期: 2021-03-02
- 修回日期: 2021-04-08
- 录用日期: 2021-04-29
- 网络出版日期: 2021-05-13
- 刊出日期: 2022-02-01

Preparation and thermophysical properties of graphite flake-carbon fiber co-reinforced copper matrix composites

HUANG Junchen^{1, 2
,},
MIAO Guodong^2
,,
CHEN Youming^1
,,
OU Yun^1
,,
GUO Shibo^2
,,
LIU Qian^{1, 2
, ,}

1.
Hunan Provincial Key Laboratory of Health Maintenance for Mechanical Equipment, Hunan University of Science and Technology, Xiangtan 411201, China
2.
School of Materials Science and Engineering, Hunan University of Science and Technology, Xiangtan 411201, China

摘要

摘要: 采用真空热压技术制备了石墨鳞片-碳纤维协同增强铜基复合材料，研究了碳纤维含量对复合材料的组织结构、抗弯强度与热导率的影响。结果表明，石墨鳞片-碳纤维/铜基复合材料界面结合良好；当碳纤维体积分数为0.5vol%~1.5vol%时，碳纤维能够均匀分散在基体中，并有效提升复合材料的抗弯强度。当碳纤维体积分数为1.5vol%时，抗弯强度达到最大值126 MPa，相比未添加碳纤维的复合材料提高了46%；但过量加入碳纤维(2vol%及以上)时，碳纤维出现团聚，使抗弯强度下降。碳纤维的加入会使复合材料的热导率小幅下降，复合材料的热导率从549 W/(m·K)降低到527 W/(m·K)。使用声子失配模型(Acoustic mismatch model，AMM)结合Digimat软件的MF模块对多相复合材料的热导率进行有效预测。
- 石墨/铜 /
- 金属基复合材料 /
- 抗弯强度 /
- 模型分析 /
- 真空热压法
Abstract: The copper-matrix composites reinforced by graphite flake and carbon fiber were prepared by vacuum hot pressing technique. The effects of carbon fiber content on the microstructure, mechanical properties and thermal properties of the composites were discussed. The results show that the prepared graphite flake-carbon fiber/copper matrix composites have good interface bonding. The carbon fibers can be uniformly dispersed in the matrix and the bending strength of the composites can be improved when the volume fraction of 0.5vol%-1.5vol% carbon fibers is added. When the content of carbon fiber is 1.5vol%, the bending strength reaches the maximum of 126 MPa, which is increased by 46% compared with that without carbon fiber. However, the excessive addition of carbon fiber (2vol% or more) leads to an uneven distribution of carbon fiber, and the bending strength of composites decreases. The thermal conductivity of the composite decreases slightly with the addition of carbon fiber, from 549 W/(m·K) to 527 W/(m·K). The acoustic mismatch model (AMM) was used in conjunction with Digimat’s MF module to effectively predict the thermal conductivity of multiphase composites.
- graphite/copper /
- metal matrix composites /
- bending strength /
- model analysis /
- vacuum hot pressing

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图 1 原材料的SEM表征微观形貌

Figure 1. Microscopic morphologies of raw materials

下载: 全尺寸图片幻灯片

图 2 样品的性能测试示意图

Figure 2. Schematic diagram of performance test of the sample

下载: 全尺寸图片幻灯片

图 3 不同体积分数碳纤维的石墨鳞片-碳纤维协同增强铜基复合材料微观形貌和微观形貌取样示意图

Figure 3. Micromorphologies of copper-matrix composites reinforced by graphite flake and carbon fiber with different volume fractions of carbon fiber and schematic diagram of microscopic morphology sampling

下载: 全尺寸图片幻灯片

图 4 石墨鳞片-碳纤维协同增强铜基复合材料的XRD图谱 (a) 及放大图 (b)

Figure 4. XRD pattern of copper-matrix composites reinforced by graphite flake and carbon fiber (a) and enlarge figure (b)

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图 5 石墨鳞片-碳纤维协同增强铜基复合材料界面处SEM图像及C、Cu、Ti元素分布图

Figure 5. SEM image of the interface of graphite-carbon fiber reinforced copper-matrix composites and the distribution of C, Cu and Ti elements

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图 6 石墨鳞片-碳纤维协同增强铜基复合材料中纤维含量对抗弯强度的影响

Figure 6. Influence of fiber content on bending strength of copper-matrix composites reinforced by graphite-carbon fiber synergism

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图 7 石墨鳞片-碳纤维协同增强铜基复合材料中纤维含量对热导率的影响

Figure 7. Effect of fiber content on thermal conductivity of graphite-carbon fiber co-reinforced copper matrix composites

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表 1 样品各组分的含量

Table 1. Content of each component of the sample

Sample	Cu/ vol%	Ti/ vol%	Graphite flake/vol%	Carbon fiber/vol%
0vol%fiber	48	2	50.0	0
0.5vol%fiber	48	2	49.5	0.5
1vol%fiber	48	2	49.0	1.0
1.5vol%fiber	48	2	48.5	1.5
2vol%fiber	48	2	48.0	2.0

下载: 导出CSV

表 2 AMM模型理论计算时使用的参数^[25-30]

Table 2. Parameters used in theoretical calculation of AMM model^[25-30]

Phase	Density/ (kg·m⁻³)	Thermal conductivity/ (W(m·K)⁻¹)	Specific heat/ (J·kg⁻¹·K⁻¹)	Phonon velocity/ (m·s⁻¹)
Cu	8960	390	385	2500 Transversal 4910 Longitudinal
TiC	4930	36.4	562	6977
Graphite flake	2260	1000 Transversal 10 Longitudinal	710	22160 Longitudinal 14660 Transversal 4140 Out-plane
Fiber	1800	150 Longitudinal 10 Transversal	710	22160 Longitudinal 14660 Transversal 4140 Out-plane

下载: 导出CSV

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