连续分布界面相对SiCp/Al复合材料热导率影响的数值模拟

doi:10.15541/jim20150150

无机材料学报 ›› 2015, Vol. 30 ›› Issue (12): 1283-1290.DOI: 10.15541/jim20150150 CSTR: 32189.14.10.15541/jim20150150

连续分布界面相对SiCp/Al复合材料热导率影响的数值模拟

邹爱华^{1, 2}, 周贤良^{1, 2}, 华小珍², 吴开阳²

(1. 南京航空航天大学材料科学与工程学院, 南京 210016; 2. 南昌航空大学材料科学与工程学院, 南昌 330063)

收稿日期:2015-03-26 修回日期:2015-07-09 出版日期:2015-12-20 网络出版日期:2015-11-24
作者简介:邹爱华(1980–), 女, 硕士, 讲师. E-mail: aihua553030@163.com
基金资助:
国家自然科学基金(51166011);航空基金(2012ZF56024);江西省金属材料微结构调控重点实验室开放基金

Effect of Continuous-distribution Inter-phase on the Thermal Conductivity of SiC_p/Al Composites by Numerical Simulation Method

ZOU Ai-Hua^{1, 2}, ZHOU Xian-Liang^{1, 2}, HUA Xiao-Zhen², WU Kai-Yang²

(1. School of Material Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China; 2. School of Material Science and Engineering, Nanchang Hangkong University, Nanchang 330063, China)

Received:2015-03-26 Revised:2015-07-09 Published:2015-12-20 Online:2015-11-24
About author:ZOU Ai-Hua. E-mail: aihua553030@163.com
Supported by:
National Natural Science Foundation of China (51166011);Aviation Science Foundation (2012ZF56024);Key Laboratory for Microstructural Control of Metallic Materials of Jiangxi Province (Nanchang Hangkong University) (JW201423003)

摘要/Abstract

摘要：

采用有限元方法对SiCp/Al复合材料的导热性能进行了数值模拟, 建立了含界面相颗粒增强铝基复合材料测试模型, 研究了不同界面相种类、厚度对复合材料热导率的影响。结果表明: 当界面相与SiC/Al结合理想时, 且界面相在颗粒表面呈连续分布时, 复合材料热导率随着界面层热导率的增加而增大, 但增加的幅度由快变慢; 复合材料热导率随界面层厚度的变化取决于界面层厚度t与颗粒粒径a的比值, 当t/a很小或t/a较大时, 热导率随界面层厚度的变化很小, 当t/a较小时, 热导率随界面层厚度的变化则与界面层热导率有关。

关键词: SiCp/Al复合材料, 有限元方法, 界面相, 热导率

Abstract:

Thermal conductivity of SiC particles-reinforced Al matrix (SiC_p/Al) composites was simulated by finite element method (FEM), in which the models of SiC particles coated with inter-phase in the aluminum matrix was established. The effects of inter-phase types and thickness on the thermal conductivity of composites were investigated. The results show that, when the inter-phase combines ideally with SiC and Al which distributes continuously on the surface of SiC_p, the thermal conductivity of composites inter-phase acts like a role of iner-layer. With increase of thermal conductivity of inter-layer, the thermal conductivity of the composites increases quickly at first and slowly afferwards. The variation of thermal conductivity of the composites depends on the ratio of inter-layer thickness (t) to the SiC_p diameter (a). When the t/a value is very small or very large, the variation of the thermal conductivity is very small, while t/a is small, the variation of thermal conductivity of the composites is related to thermal conductivity of the inter-layer.

Key words: SiCp/Al composites, finite element method, inter-phase, thermal conductivity

中图分类号:

TB333

邹爱华, 周贤良, 华小珍, 吴开阳. 连续分布界面相对SiCp/Al复合材料热导率影响的数值模拟[J]. 无机材料学报, 2015, 30(12): 1283-1290.

ZOU Ai-Hua, ZHOU Xian-Liang, HUA Xiao-Zhen, WU Kai-Yang. Effect of Continuous-distribution Inter-phase on the Thermal Conductivity of SiC_p/Al Composites by Numerical Simulation Method[J]. Journal of Inorganic Materials, 2015, 30(12): 1283-1290.

图/表 13

图 1 不同预处理SiC颗粒的SEM形貌及EDS分析结果

Fig. 1 SEM morphology and EDS analysis of SiC particles with different pre-treatments. (a) after pickling , (b, d) electroless Ni deposition, (c, e) electroless Cu deposition

图 2 颗粒镀Ni(a)和颗粒镀Cu(b)后的SiC颗粒所制备复合材料显微组织照片

Fig. 2 Optical microstructures of the composites prepared from SiC particles coated with (a) Ni and (b) Cu

图3 界面相完全包覆颗粒复合材料模型

Fig. 3 Model of the composites with the particles coated by the inter-phase completely

图4 复合材料模型网格划分示意图

Fig. 4 Schematic diagram of meshing in the model of the composites

表1 复合材料模型和模拟的参数及所对应的参数值

Table 1 Model of the composites, the simulated parameters and the corresponding values

Model	Parameter	Value of parameter
Four particles coated by inter-phase completely	Type of inter-phase	1.4(SiO₂); 5.9(MgAl₂O₄); 10, 50, 90(Ni); …, 290, 384(Cu)
Four particles coated by inter-phase completely	Thickness of inter-phase	0.5, 1.0, 1.5, …, 4.5 μm

图5 复合材料热导率随界面相本征热导率的变化关系

Fig. 5 Variation in thermal conductivity of the composites with intrinsic thermal conductivity of different inter-phase

图6 界面相本征热导率不同时, 复合材料热流密度矢量图

Fig. 6 Heat flux density vector for the composites with different intrinsic thermal conductivity of inter-phase. (a) 10 W/(m·K); (b) 50 W/(m·K)

图7 颗粒表面覆盖3.5 μm SiO2复合材料热流密度分布图

Fig. 7 Heat flux distribution of the composites with the particles coated by 3.5 μm SiO2

图 8 复合材料热导率(kc)与基体热导率(km)比值随颗粒热导率(kp)与基体热导率(km)比值的变化关系

Fig. 8 Variation in the ratio of thermal conductivity of the composites (kc) to the matrix (km) with the ratio of thermal conductivity of the particles (kp) to the matrix (km)

图9 复合材料热导率随界面相厚度的变化关系

Fig. 9 Variation in thermal conductivity of the composites with different thickness of inter-phase

图10 复合材料热流密度分布图

Fig. 10 Heat flux of the composites with the coated particles. (a) 3.5 μm Ni; (b) 1.5 μm Cu

表2 当t/a、界面相本征热导率不同时, 复合材料热导率随界面相厚度的变化值

Table 2 Value of thermal conductivity of the composites with different thickness of inter-phase when varying in t/a and intrinsic thermal conductivity of inter-phase

t/a	t/μm	K_c/(W·m^-1·K^-1)
t/a	t/μm	K_j1=1.4 (W·m^-1·K^-1)	K_j2=384 (W·m^-1·K^-1)
1: 300	0.5	153.53	153.59
1: 300	3.5	153.20	154.43
1: 30	0.5	123.92	167.60
1: 30	3.5	73.28	170.41
1: 3	0.5	62.20	204.29
1: 3	3.5	61.80	204.65

表3 SiCp/Al复合材料热导率实验值与模拟值的比较

Table 3 Comparison of the experimental values with the simulated values for thermal conductivity of SiCp/Al composites

SiC particle			Experimented/(W·m^-1·K^-1)	Simulated/(W·m^-1·K^-1)
Surface state	Diameter/μm	Volume fraction/%	Experimented/(W·m^-1·K^-1)	Simulated/(W·m^-1·K^-1)
After pickling	90	50	161.83	162.54
Ni-coated (3.5μm)	90	50	152.80	156.66
Cu-coated (3.5μm)	90	50	168.21	170.41

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连续分布界面相对SiCp/Al复合材料热导率影响的数值模拟

Effect of Continuous-distribution Inter-phase on the Thermal Conductivity of SiC_p/Al Composites by Numerical Simulation Method

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连续分布界面相对SiCp/Al复合材料热导率影响的数值模拟

Effect of Continuous-distribution Inter-phase on the Thermal Conductivity of SiCp/Al Composites by Numerical Simulation Method

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Effect of Continuous-distribution Inter-phase on the Thermal Conductivity of SiC_p/Al Composites by Numerical Simulation Method