Preparation of Al/SiC Composite Coatings on Surface of Aluminum Alloy by Atmospheric Plasma Spraying

摘要:

对铝合金表面等离子喷涂制备Al/SiC复合涂层进行了研究，探索了SiC体积分数对复合粉末的沉积行为以及Al/SiC复合涂层性能的影响规律。研究发现，在等离子焰流中，纯SiC发生降解和氧化。SiC含量越高，等离子喷涂沉积Al/SiC复合涂层越困难，纯SiC沉积后与基体粘结层之间存在裂纹；SiC含量越高，Al/SiC复合涂层硬度越高。Al/SiC (50:50)复合涂层厚度70 μm，显微硬度达到3690 MPa，对铝合金表面起到强化效果

Abstract:

Al/SiC composite coatings were deposited on the surface of aluminum alloy by atmospheric plasma spraying. The effects of SiC volume in Al/SiC composite powders on the deposition behavior and the properties of the Al/SiC coatings were investigated. It is found that the decarburization and oxidation of pure SiC powder occur in the plasma flame. With the increase of SiC content, the deposition of the Al/SiC composite powder becomes more difficult through plasma spraying. There exist cracks between the bond coat and the aluminum alloy substrate resulting in poor adhesion between them. The hardness of the composite coating becomes higher with the increase of SiC content. The Al/SiC (50:50) deposit with a thickness of 70 μm and a hardness of 3690 MPa can strengthen the surface of aluminum alloy