TiO_2-CNTs/FeNi36激光熔覆复合涂层制备研究

采用激光熔覆技术制备了TiO_2-CNTs/FeNi36复合涂层,研究了核壳式TiO_2-CNTs增强体对激光熔覆复合涂层孔洞、微观结构和摩擦学性能的影响。结果表明:核壳式TiO_2-CNTs增强体的加入大大减小了复合涂层中孔洞数量和尺寸,有效抑制了涂层大孔洞的产生;增强体的加入没有改变因瓦合金基体物相组成,基体合金仍为FeNi]奥氏体单相。随着增强体含量的增加,复合涂层基体合金的晶格常数逐渐减小,然后保持稳定;复合涂层维氏硬度逐渐增加,然后趋向稳定,最大值为315 HV,约为单一因瓦合金涂层的2.5倍;当增强体含量为1.5 wt%,磨损率最低,较单一因瓦合金涂层降低了60%,复合涂层摩擦学性能得到了提高。

Fabrication of Laser Cladding TiO2-CNTs/FeNi36 Composite Coating

TiO₂-CNTs/FeNi36 composite coating was fabricated by laser cladding technology in this paper, and the effect of core -shell TiO₂ CNTs reinforcement on the hole, microstructure and tribology properties of the composite laser cladding were studied. The results show that the number and size of holes in the invar alloy matrix is greatly reduced due to the addition of core-shell TiO₂ CNTs reinforcement, and the generation of holes in the composite coating is restricted by the reinforcement. The addition of reinforcement does not change the phase composition of invar alloy matrix, and the matrix alloy is still single-phase FeNi] austenite. With the increase of reinforcement content, the lattice constant of invar alloy matrix decreases slowly, then keeps stable; the hardness of the composite coating has the stable value after a little growth. The stable microhardness of composite coating is about 315 HV, which is about 2.5 times that of the FeNi36 invar alloy coating. When the mass fraction of TiO₂ CNTs reinforcement is 1.5 wt%, the wear rate of the composite coating is minimum, which is reduced by 60% compared with single FeNi36 coating.