激光熔覆TiC增强FeAl金属间化合物基复合材料涂层磨损性研究

Wear Resistance of Laser Clad TiC Reinforced FeAl Intermetallic Matrix Composite Coatings

摘要:

利用激光熔覆技术在1Cr18Ni9Ti奥氏体不锈钢表面制得了以TiC为增强相、以FeAl 金属间化合物为基体的耐磨复合材料涂层，研究了激光熔覆。FiC／FeAl复合材料涂层在干滑动磨损条件下的耐磨性能及磨损机制。结果表明：随着载荷和滑动速率的增加，TiC／FeAl金属间化合物基复合材料涂层的磨损速率增加，其磨损机制随着载荷的增加逐渐由磨料磨损向粘着磨损转变；激光熔覆层中TiC体积分数的增加，一方面提高了涂层的磨料磨损抗力，另一方面降低了熔覆层表面与对磨材料之间的粘着倾向，提高了TiC／FeAl涂层的滑动磨损性能。激光熔覆TiC/FeAl金属间化合物基复合材料涂层具有优异的耐磨性能并随TiC体积分数的增加而提高。

Abstract:

TiC reinforced FeAl intermetallic matrix composite coatings were fabricated on the substrate of 1Crl8Ni9Ti by laser cladding, the dry sliding wear resistance of the composite coating was evaluated under dry sliding wear conditions as functions of applied load and sliding speed. The wear mechanisms were discussed based on the worn surfaces and wear debris examinations. Results showed that the laser clad TiC/FeAl intermetallic matrix composite coatings have outerstanding wear resistance under the dry sliding wear test conditions. The wear rate of TiC/FeAl composite coatings increases with increasing applied load and sliding speed. SEM observation of worn surfaces and wear debris indicated that there is a transition of wear mechanism from abrasive wear to adhesive wear with increasing applied load. Furthermore, with the increase of volume fraction of TiC carbide in laser clad coating, the resistance to abrasive wear is improved, and the adhesion between test specimen and counter-face material is reduced, leading to an excellent abrasive and adhesive wear resistance.