Effect of Laser Surface Texturing on Coating Adherence and Tribological Properties of CuNiIn and MoS2 Coating

Abstract

In aero gas turbine engine, copper nickel indium (CuNiIn) and molybdenum loaded disulphide (MoS2) duplex coating is applied on Ti6Al4V blades in bladed disk con guration of low pressure and high pressure compressor. Coating between blade and disk is provided to prevent fretting wear due to direct metal to metal contact of Ti6Al4V. Generally, grit blasting will be done for preparation of the surface before the application of coating. Laser surface texturing (LST) process can be explored by aero engine industry as a new surface preparation process for compressor blades. To compare two different surface preparation methods, Ti6Al4V surface is prepared by two different processes, conventional grit blasting as well as laser surface texturing (LST). LST with different elliptical and square patterns are created on Ti6Al4V. Surface topography is analyzed by SEM and WLI. CuNiIn is sprayed by atmospheric plasma spray (APS) and MoS 2 on top of CuNiIn by painting and curing. Effects of surface preparation on coating adherence as well as on tribological properties are studied. The results showed that geometry and dimensions of LST pattern in uences the coating adherence and wear performance. LST process can be optimized for better performance and explored as an alternative surface preparation process in industry for thermal spray coatings.

Improvement of thermal plasma sprayed coating adhesion strength by laser microtexturing of aluminum

“…Among the different surface microtexturing techniques, grit-blasting or sandblasting is a widely used method, but one of the main disadvantages of using this technique is that it does not allow selective roughening and does not create any xed and repeated pattern. Grit-blasting also leads to grit entrapment [2]. One of the alternative techniques for surface microtexturing is using a laser.…”

Effects of 3D Roughness Parameters of Sandblasted Surface on Bond Strength of HVOF Sprayed WC-12Co Coatings

“…Therefore, the morphology characteristics of the pretreated surface significantly affect the bonding property of TSCs [4]. At present, many types of technologies have been employed for pretreating surfaces of the components to be sprayed, such as water jet [5,6], sandblasting [7,8], laser surface texture technology [9,10] and turning [11], etc. Among them, the sandblasting process, as a conventional pretreatment process, has the advantages of simple processing steps, high efficiency and low cost.…”