Anti-oxidation high-hardness wear-resistant coating on surface of titanium alloy and preparation method

Abstract

The invention belongs to the field of titanium alloy surface engineering, and particularly relates to an anti-oxidation high-hardness wear-resistant coating on surface of a titanium alloy and a preparation method. The coating is prepared by a coaxial powder feeding laser cladding technology; and cladding powder comprises the following components in percentage by mass: 75wt% of TC4 and 25wt% of NiCr-Cr3C2 powder. The coaxial powder feeding laser cladding technology can accurately control the forming quality, reduces the finish machining workload in the coating application process, and improvesthe efficiency. The Cr3C2 powder has a low melting point, does not have unmelted particles in the machining process, and meanwhile has good normal-temperature and high-temperature hardness; the composite powder NiCr-Cr3C2 can provide elements required for forming a reinforcing phase in the laser cladding process, and meanwhile can provide Ni and Cr elements for matrix solution strengthening; and the Ti6Al4V powder relieves the overlarge thermophysical difference between the reinforcing phase and a base material, and can achieve a certain deformation buffering effect.

Description

technical field [0001] The invention belongs to the field of titanium alloy surface engineering, and in particular relates to an anti-oxidation, high-hardness and wear-resistant coating on the surface of titanium alloy and a preparation method thereof. Background technique [0002] Titanium alloy has the characteristics of low density, high specific strength, and strong corrosion resistance. It is widely used in the fields of aviation, aerospace, ships, and marine engineering equipment, and plays an irreplaceable role in the advancement and lightweight of equipment. Taking aviation aircraft as an example, the aircraft fuselage material is gradually transitioning from traditional aluminum alloy materials to carbon fiber reinforced materials (CFRP), and some high-strength steel components such as frames and joints are also replaced by titanium alloys to reduce weight. This is because titanium alloy has the characteristics of light weight and high strength, and at the same time...

AI Technical Summary

Problems solved by technology

[0005] Patents No. 1 and No. 2 in the above table both use electroless plating to prepare wear-resistant coatings. Not only the method steps are cumbersome, but also the use of more acidic and alkaline reagents in the preparation process is relatively toxic to the environment and the human body; No. 3 The patent is that cold spraying of H13 powder is required in the laser cladding process, and the powder needs to be prepared by special treatment, and the spraying steps are relatively cumbersome; the cladding powder of the No. The deformation coordination ability between the various phases is poor, and defects such as cracks are prone to occur. Therefore, rare earth elements are needed to improve the coating quality; the No. 5 patent prepares the laser wear-resistant coating by the preset powder method, and the preset powder will also contact during the preparation process. Acidic, alkaline and toxic reagents have great safety hazards, and the forming control of the preset powder method is difficult. The volatilization of the binder during the processing will cause defects in the coating, and the coating of the preset coating is easy to fall off

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