真空电热挤压烧结SiC_p/6061Al复合材料及性能分析
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摘要
采用真空电热挤压烧结成形技术制备60%SiC_p/6061Al复合材料。通过对其热物理性能、力学性能、密度、硬度的测试及微观组织分析,考察圆形试样在径向方向及轴向方向的性能分布。结果表明:该方法制备的复合材料成形性好,试样表面光滑平整;从微观形貌来看,增强体SiC颗粒分布均匀,组织较致密。热导率在径向方向的变化规律为中心部位热导率低于边缘区域,在轴向方向的变化规律为石墨动压头接触面的热导率高于石墨静压头接触面的热导率;其热膨胀系数、抗折强度、密度和硬度在径向方向的变化规律为从中心部位到边缘区域依次增大。
The 60% SiC_p/Al materials were prepared by vacuum electric heating extrusion sintering forming technology.The performance distribution of circular sample in the radial direction and axial direction was explored by testing and analyxing the thermal physical properties, mechanical properties, density, hardness and microstructure. The results indicated that composite material prepared by this method is good formability and the surface is smooth. It is found that silicon carbide particles distributes uniformly and microstructure is relatively dense by observing the microstructure. The change rule of heat conductivity in the radial direction is that center position is lower than the edge position and the change rule of heat conductivity in the axial direction is that the heat conductivity of graphite dynamic head contact area is higher than graphite static head interface. The change rule of thermal expansion coefficient, flexural strength, density and hardness in the radial direction is that the heat conductivities increase in turn from center position to edge position.
The 60% SiC_p/Al materials were prepared by vacuum electric heating extrusion sintering forming technology.The performance distribution of circular sample in the radial direction and axial direction was explored by testing and analyxing the thermal physical properties, mechanical properties, density, hardness and microstructure. The results indicated that composite material prepared by this method is good formability and the surface is smooth. It is found that silicon carbide particles distributes uniformly and microstructure is relatively dense by observing the microstructure. The change rule of heat conductivity in the radial direction is that center position is lower than the edge position and the change rule of heat conductivity in the axial direction is that the heat conductivity of graphite dynamic head contact area is higher than graphite static head interface. The change rule of thermal expansion coefficient, flexural strength, density and hardness in the radial direction is that the heat conductivities increase in turn from center position to edge position.
引文
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[2]仝蒙,傅蔡安,季坤,等.IGBT用铝基碳化硅基板制备及性能测试[J].热加工工艺,2014,43(10):121-124.
[3]崔葵馨,常兴华,李希鹏,等.高体积分数铝碳化硅复合材料研究进展[J].材料导报,2012,26(2):401-405.
[4]胡锐,袁秦鲁,李金山,等.真空热压烧结SiCp/Al复合材料的界面元素扩散及增强断裂机理[J].机械科学与技术,2004,23(10):1198-1200.
[5]Wang H M,Chen Y L,Yu L G.‘In-situ’weld-alloying/laser beam welding of SiCp/6061Al MMC[J].Materials Science and Engineering:A,2000,293(1):1-6.
[6]Guo S J,Kang G Z,Dong C.Numerical simulations for uniaxial ratcheting of SiCp/6061Al composites concerning particulate arrangement[C]//Advanced Materials Research.Trans Tech Publications,2007(26):317-320.
[7]Liu C,Qin S,Zhang G,et al.Micromechanical properties of high fracture performance SiCp-6061Al/6061Al composite[J].Materials Science and Engineering:A,2002,332(1):203-209.
[8]关丽娜,耿林.Effect of hot extrusion on microstructure and properties of(ABOw+SiCp)/6061Al composites fabricated by semi-solid stirring technique[J].Journal of Wuhan University of Technology:materials Science Edition,2009(1):13-16.
[9]Lei Y C,Xue H L,Hu W X,et al.Effects of ac arc ultrasonic on plasma arc in situ welding of SiCp/6061Al MMCs[J].Science and Technology of Welding and Joining,2011,16(6):561-566.
[10]Lei Y C,Xue H L,Hu W X,et al.Effect of arc ultrasonic vibration on microstructure of joint of plasma arc‘in situ’welding of SiCp/6061Al[J].Science and Technology of Welding and Joining,2011,16(7):575-580.
[11]Li H,Li J B,Sun L Z,et al.Modification of the residual stress state in a SiCp/6061Al composite by low-temperature treatment[J].Composites science and technology,1997,57(2):165-172.