A preparation method of cr-zr-ti solid solution layer taking into account the wear resistance and fatigue resistance of titanium alloy
A solid solution layer, titanium alloy technology, applied in solid diffusion coating, metal material coating process, coating and other directions, can solve the problem of low hardness of Cr-Ti solid solution layer, achieve a good match between hardness and toughness, improve The effect of improving wear resistance and fatigue resistance and fatigue life of titanium alloys
Active Publication Date: 2019-10-22
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology
However, the hardness of the Cr-Ti solid solution layer is not high, and the potential of the diffusion layer with both anti-wear and fatigue resistance cannot be fully utilized. Therefore, it is necessary to further design and prepare a diffusion layer with excellent toughness and comprehensive properties.
[0004] At present, the use of plasma surface alloying technology to prepare Cr-Zr-Ti solid solution layer, that is, the method of Cr and Zr diffusion layer and its application has not been reported in the research field at home and abroad. The development of Cr-Zr with good hardness and toughness matching -The preparation method of Ti solid solution layer is of great significance to solve the problem of both anti-wear and anti-fatigue of titanium alloy key parts
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[0020] This embodiment is a preparation method of a Cr-Zr-Ti solid solution layer that takes into account both wear resistance and fatigue resistance of titanium alloy.
[0021] refer to Figure 1 to Figure 5 , the preparation method of the Cr-Zr-Ti solid solution layer that takes into account the wear resistance and fatigue resistance of titanium alloy is used to analyze the TC4 titanium alloy disc sample, and the specific steps are as follows:
[0022] (1) Mechanically polish the TC4 titanium alloy disc used for wear test, the sample size is F30×6mm, longitudinally polish the TC4 titanium alloy fatigue sample, clean it with acetone and alcohol, and dry it with air for later use;
[0023] (2) Hang two Zr targets on the source electrode of the vacuum furnace. The size of the Zr target is 180×150×6mm, and then hang the cleaned sample on the workpiece electrode in the middle of the target, and adjust the sample and target The distance is 30 ~ 35mm, and the vacuum is evacuated t...
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The invention discloses a preparation method of a Cr-Zr-Ti solid solution layer combining the abrasion-resistant and anti-fatigue properties of a Ti alloy. According to the preparation method, the Cr-Zr-Ti solid solution layer being tough and excellent in comprehensive performance is developed on the surface of the Ti alloy by utilizing plasma surface alloying technology, and a novel technologicalapproach is provided for solving the problem that key parts of the Ti alloy need to combine the abrasion-resistant and anti-fatigue properties; Zr diffusion treatment is performed at first, the TC4 Ti alloy is subjected to Zr diffusion treatment and Cr diffusion treatment in sequence, and the treated test sample is taken out, thereby removing a sedimentation layer and a compound layer which are not beneficial to the anti-fatigue property; accordingly, a diffusion layer which is formed from the Cr and Zr elements on the surface of a TC4 matrix, namely the Cr-Zr-Ti solid solution layer, servesas a remaining diffusion layer; the hardness and the toughness of the Cr-Zr-Ti solid solution layer are well matched, and the Cr-Zr-Ti solid solution layer are tough and excellent in comprehensive performance; the TC4 Ti alloy abrasion rate can be lowered and the fatigue life can be prolonged; and the prepared Cr-Zr-Ti solid solution layer, namely the diffusion layer, has great potential in the combination of the abrasion-resistant and anti-fatigue properties.
Description
technical field [0001] The invention relates to the technical field of titanium alloy surface modification and strengthening, in particular to a preparation method for using solids to infiltrate metal elements on the surface of metal materials. Background technique [0002] As we all know, titanium alloy has low hardness and poor wear resistance, and is easy to wear in friction contact with itself or other engineering materials, which greatly limits its engineering application. Moreover, as an important material widely used in aviation, aerospace and biomedical industries, titanium alloys are often subjected to alternating fatigue loads, such as fretting fatigue damage, in addition to frictional contact in some applications. This requires surface treatment to take into account both the wear resistance and fatigue resistance of titanium alloys. However, in addition to ion implantation technology, hard wear-resistant layers prepared by surface alloying, plasma spraying, elect...
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IPC IPC(8): C23C10/28C23C14/34C23C14/16C23C14/58
Inventor 于首明刘道新刘成松张晓化
Owner NORTHWESTERN POLYTECHNICAL UNIV