Titanium alloy high-temperature oxidation-resistant anti-fretting wear coating material, coating and preparation method

Abstract

The invention discloses a titanium alloy high-temperature oxidation-resistant fretting-wear-resistant coating material, a coating and a preparation method of the coating. The titanium alloy high-temperature oxidation-resistant fretting-wear-resistant coating material contains hexagonal boron nitride (h-BN), MCrAlYX alloy powder and a binding agent and is composed of 5-30% of hexagonal boron nitride, 0-5% of a binding agent and the balance of MCrAlYX, wherein M is Co, Ni, Fe or alloy thereof, and X is one or combination of more than one of alloy elements such as Ti, Hf, Ta, Nb, Re, Ti and Si. In the preparation method of the coating, high velocity oxy fuel spraying or atmospheric plasma spraying is adopted. The highest use temperature of the coating can reach 1100 DEG C, and the coating can be applied to protection for tenon-mortise structure connecting parts of titanium alloy and high-temperature alloy parts of a fan, a compressor blade, a turbine blade and the like of an aircraft engine, a ground combustion gas turbine and the like.

Description

technical field [0001] The invention belongs to the technical field of thermal spraying materials and coatings, and relates to a high-temperature-resistant and fretting-resistant coating material suitable for titanium alloy and high-temperature alloy blade tenons, a coating and a preparation method thereof. Background technique [0002] Tenon / tongue-and-groove connections are widely used in aero-engines, such as fan blades, compressor blades and discs, turbine blades and discs, etc. The working conditions of engine blades are very complex, and they must bear the combined effects of mechanical, thermal and aerodynamic loads. The tenon / tenon-groove contact surface is often damaged by fretting wear and fatigue, resulting in blade fracture and failure. Layers protect the tenons of the blades to meet the actual use requirements. [0003] The current widely used method for aero-engines and gas turbines is to use CuNi or CuNiIn coating to protect the tenons of titanium alloy fans ...

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Problems solved by technology

[0003] At present, the method widely used in aero-engines and gas turbines is to use CuNi or CuNiIn coating to protect the tenons of titanium alloy fans and compressor blades. The actual working condition of the fan / compressor is from -60°C to 650°C, which exceeds the effective service temperature upper limit of 315°C for copper-nickel and copper-nickel-indium alloy systems. After oxidation, the friction coefficient of CuNi or CuNiIn material increases with the number of uses (450°C, after 1200 friction cycles, the coefficient of sliding friction is 0.58, which is 50% higher than normal temperature), resulting in pits, micro-cracks, and even blade breakage on the surface of titanium alloy parts, which seriously affects the blade. Service life and safety of engine operation

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