Low-pressure pulse vacuum nitriding method and low-pressure pulse vacuum nitriding device for titanium alloy

A low-voltage pulse, titanium alloy technology, applied in the direction of metal material coating process, coating, solid diffusion coating, etc., can solve the problems of hindering the inward diffusion of nitrogen, slow nitriding speed, hindering the penetration of nitrogen, etc. Oxidation, Barrier Reduction, and Adsorption Enhancement Effects
CN103469147AInactive Publication Date: 2013-12-25GUIZHOU NORMAL UNIVERSITY
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
GUIZHOU NORMAL UNIVERSITY
Publication Date
2013-12-25
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a low-pressure pulse vacuum nitriding method and a low-pressure pulse vacuum nitriding device for a titanium alloy. The low-pressure pulse vacuum nitriding method comprises the steps of firstly putting a titanium alloy sample into an inner cavity of a reactor tank after preprocessing the surface of the titanium alloy sample, vacuumizing the reactor tank subjected to sealing and leakage detecting, simultaneously heating the reactor tank to maintain the temperature of the inner cavity of the reactor tank at 700-1000 DEG C, and adding a nitriding gas medium into the inner cavity of the reactor tank in a pulse gas filling manner (namely repeatedly and periodically adding the nitriding gas medium by carrying out ventilation, closing-maintaining, air exhausting and closing-maintaining while ventilating), so as to change the pressure of the nitriding gas medium in the inner cavity of the reactor tank in a rectangular pulse manner, wherein the period range of a rectangular pulse is 10-200 minutes, and the pressure of the nitriding gas medium is maintained within a range of 0-0.050MPa. The low-pressure pulse vacuum nitriding device has the advantages of simplicity in operation, suitability in batch production, high machining efficiency, good and stable product quality and the like.
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Description

technical field

[0001] The invention relates to a titanium alloy low pressure pulse vacuum nitriding method and device, belonging to the technical field of titanium alloy nitriding. Background technique

[0002] Due to the advantages of high specific strength, high temperature resistance, good corrosion resistance, good low temperature toughness and biocompatibility, titanium alloys are widely used in the fields of national defense, chemical industry, energy, aerospace and bioengineering. However, because the surface hardness of titanium alloy is not high, it has disadvantages such as poor wear resistance and fatigue resistance, and it is easy to cause adhesive wear with many materials.

[0003] Surface modification technology is an effective way to improve the hardness, wear resistance and fatigue resistance of titanium alloys. According to research at home and abroad, the surface modification technology of titanium alloys has roughly experienced electroplating, chemical p...

Claims

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