摘要: |
研究不同搅拌摩擦加工工艺制备碳化硅铝复合材料,以期利用搅拌摩擦加工固相成形技术,解决碳化硅颗粒在铝基体内分布不致密、不均匀的问题。采用不同进给速度对碳化硅铝复合材料进行搅拌摩擦加工,制备碳化硅含量为15%的碳化硅铝复合材料,对试样分别进行微观组织观测及性能测试。试验结果表明,在进给速度为600mm/min时,获得了内部组织致密,碳化硅铝分布均匀,密度为2.85g/cm3,热膨胀系数最低为19.6×10-6~23.0×10-6K-1,最大抗拉强度为78MPa,断后延伸率为18%的碳化硅铝复合材料。进给速度的增大不利于碳化硅颗粒在铝基体中的致密、均匀分布,同时也会增大复合材料的热膨胀系数。碳化硅铝复合材料的断口形貌呈现出韧性断裂的特征,具有较强的塑性变形能力。 |
关键词: 搅拌摩擦加工;碳化硅铝;微观组织;热膨胀系数 |
基金项目: |
|
Effect of Stirring Friction Machining on the Properties and Process of Silicon Carbide Aluminum Composite Materials |
Dou Chengliang1, Liu Xu1, Huang Xiaomeng1, Wu Helong1, Bao Jian1, Qi Yuefeng2
|
1. Beijing Non-ferrous Metals and Rare Earth Research Institute Co., Ltd., Beijing 100012;2. Beijing Engineering Research Center of New Brazing Materials for Electronic Information, Beijing 100012
|
Abstract: |
Study the preparation of silicon carbide aluminum composite materials using different stir friction machining processes, with the aim of utilizing the solid state forming technology of stir friction machining to solve the problem of non dense and uneven distribution of silicon carbide particles in the aluminum matrix. Using different feed rates, stir friction machining was performed on silicon carbide aluminum composite materials to prepare silicon carbide aluminum composite materials with a silicon carbide content of 15%. The microstructure and performance of the samples were observed and tested. The experimental results show that at a feed rate of 600mm/min, a dense internal structure, uniform distribution of silicon aluminum carbide, a density of 2.85g/cm3, and thermal expansion coefficient of was obtained 19.6×10-6~23.0×10-6K-1, a silicon carbide aluminum composite material with a maximum tensile strength of 78MPa and an elongation of 18% after fracture. The increase in feed rate is not conducive to the dense and uniform distribution of silicon carbide particles in the aluminum matrix, but also increases the thermal expansion coefficient of the composite material. The fracture morphology of silicon carbide aluminum composite material exhibits the characteristics of ductile fracture and has strong plastic deformation ability. |
Key words: stirring friction machining;silicon aluminum carbide;microstructure;coefficient of thermal expansion |