Abstract
Copper nickel indium (CuNiIn) and Molybdenum disulphide (MoS2) duplex coating is used in aero engine compressor blades of Ti6Al4V to prevent fretting failure. Surface before coating is roughened by grit blasting process for coating adhesion. In present study, in place of grit blasting, laser surface texturing (LST) process is used for surface preparation and compared with grit blasted surface. Four different elliptical and square patterns are created by LST on Ti6Al4V. Difference of surface topography between LST and grit blasted surface is analyzed by SEM and white light interferometery. CuNiIn is deposited on Ti6Al4V by atmospheric plasma spray. MoS2 lubricating coating is deposited on top of CuNiIn by spray painting and curing. Effect of difference in surface preparation on coating microstructure as well as on tribological properties is studied. The results showed that geometry and dimensions of LST pattern influence 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.
Highlights
From inception of titanium and its alloys from early 1950s, these become important materials in a very less span for the aerospace, energy and chemical industries
For application of CuNiIn and MoS2 coating on Ti6Al4V, surface preparation is carried out with grit blasting, a conventional method followed by industry and laser surface texturing with varied patterns
Two different types of elliptical and square patterns are created by varying laser surface texturing parameters
Summary
From inception of titanium and its alloys from early 1950s, these become important materials in a very less span for the aerospace, energy and chemical industries. MoS2 coating can withstand temperature up to 300°C This duplex configuration coating of CuNiIn and MoS2 is used in engine to improve the tribological properties and prevent fretting failure between two contacting surface of titanium alloy. Surface texturing on aluminum alloy AA5052-H32 sheet created by desktop micro rolling has increased total effective surface area for bonding This helped in improving the mechanical anchoring and in turn adhesive strength of joint [13]. Laser texturing with groves in stainless steel increased the adhesion strength of atmospheric plasma sprayed molybdenum coating by 49.7% as compared to grit blasted surface [21].Surface texturing of triangular pattern was created by LST on die steel (50Cr) substrate. The effect of laser textured intermediate nickel electroplated layer on tribological properties of silver coating at room and high temperatures was investigated by the ball-on-disk friction and wear tests. Effect of different texturing patterns on tribological properties of coating is reported
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