A method for anti-seizure of ti alloy workpiece

Abstract

The invention belongs to the technical field of surface treatment of low temperature plasma materials, and particularly relates to a method for preventing seizure of Ti alloy workpieces. The method comprises nine steps. The method realizes a preparation process of Ti-TiN periodic composite coating by Ti alloy workpiece baking degassing, ion beam sputtering cleaning and in-situ ion beam assisted magnetron sputtering deposition to obtain the uniform and compact Ti-TiN periodic composite coating with good bonding performance. The method has the advantage of improving the characteristics such as the wear resistance, fatigue resistance and fretting wear of the workpieces to meet the requirements of anti-seizure and wear resistance. The Ti-TiN periodic composite coating prepared on an inner threaded surface of a Ti alloy fastener has the advantages of high purity, good film-based bonding performance, uniform and dense film layers, and no porosity at the interface. The treated Ti alloy fastener meets the requirements of wear resistance, anti-seizure, anti-fretting wear and the like, has at least 2 times higher anti-seizure performance than untreated workpieces, meets the use requirementsof a certain type of equipment, greatly reduces the cost, and improves the overall use stability and the service life of the equipment.

Description

technical field [0001] The invention belongs to the technical field of low-temperature plasma material surface treatment, and in particular relates to a method for preventing seizure of a Ti alloy workpiece. Background technique [0002] Titanium and its alloys have the advantages of high strength, low density, good heat resistance and mechanical properties, and are widely used in compressor blades, turbine blades and equipment weight reduction process. The invention relates to a certain type of equipment in the process of weight reduction, using a pair of fasteners that are both titanium alloy base materials, and the phenomenon of mutual bite is easy to occur during the service process, which greatly reduces the stability and service life of the equipment. Due to some limitations of the properties of Ti alloy itself: low hardness, poor wear resistance, strong chemical activity and other performance limitations, in addition, the titanium alloy fasteners involved in the inven...

AI Technical Summary

Problems solved by technology

The present invention relates to a certain type of equipment in the process of weight reduction, using a pair of fasteners with the same titanium alloy base material, it is easy to cause mutual seizure during service, which greatly reduces the stability and service life of the equipment

Due to some limitations in the performance of Ti alloy itself: low hardness, poor wear resistance, strong chemical activity and other performance limitations, plus the titanium alloy fasteners involved in this invention are subjected to high temperature, high pressure, and periodic impact loads during use , corrosive media, etc., lead to the problem of wear and mutual seizure between titanium alloy fasteners, resulting in surface strain of the thread buckle, difficult maintenance and disassembly, seriously affecting its working stability and service life

However, the existing titanium alloy surface treatment technology has different limitations in the application of this aspect. For example, the micro-arc oxidation technology has the problem of brittle layer shedding, the anodic oxidation technology has great pollution to the environment, and the cost of ion implantation technology is too high. , after treatment by ion nitriding technology, there are brittle phases on the surface, and the toughness is obviously reduced.

Titanium alloy surface coating technology also has the problem of poor film-base bonding performance and easy peeling off of the coating.

Images