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A preparation method for titanium carbonitride protective coating on metal workpiece surface

A technology for metal workpieces and protective coatings, applied in metal material coating processes, coatings, solid-state diffusion coatings, etc., can solve problems such as low bonding strength, easy peeling of coatings, and workpiece wear, so as to improve strength, toughness, Excellent peeling resistance and long service life

Active Publication Date: 2016-02-03
东莞市泰富顿纳米技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Focusing on metal workpieces with a carbon content exceeding 0.45wt%, aiming at the deficiencies in the prior art, the present invention provides a method for preparing a titanium carbonitride protective coating on the surface of metal workpieces, which solves the problems existing in the prior art The interface bonding strength with the substrate is low, the coating is easy to peel off during use, and the resulting workpiece is quickly worn and scrapped, etc.

Method used

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  • A preparation method for titanium carbonitride protective coating on metal workpiece surface
  • A preparation method for titanium carbonitride protective coating on metal workpiece surface
  • A preparation method for titanium carbonitride protective coating on metal workpiece surface

Examples

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Embodiment 1

[0035] The metal workpiece to be processed is a Cr12 (carbon content 2.1wt%) mold with a size of 300×200×30mm. Clean, degrease and degrease the surface of the metal workpiece in advance, and dry it at 90°C for 1 hour. Select FTi-1 (350 mesh) titanium powder produced by Beijing Taixinlong Metal Material Processing Factory, use 2wt% (powder weight) of absolute ethanol as the binder to brush on the surface of the mold working surface for 10 times, before compacting The pre-coating thickness is 0.1mm, cold pressing for 5 minutes, cold pressing pressure 1.5MPa, the thickness of the titanium powder layer after compaction is 6-8 microns; then put it into a vacuum induction furnace, vacuumize to 0.5Pa; use induction heating Heat the metal workpiece to 950°C and keep it warm for 2 hours; fill it with high-purity nitrogen to 0.1MPa, and keep the temperature and nitrogen atmosphere for 7 hours. The workpiece is immersed in 70°C quenching oil for quenching treatment; then tempered at 200...

Embodiment 2

[0038] The workpiece to be processed is a Cr12MoV (carbon content 1.55wt%) stamping die with a size of 400×200×20mm. Clean, degrease and degrease the surface of the metal workpiece in advance, and dry it at 90°C for 1 hour. Select FTi-1 (350 mesh) titanium powder produced by Beijing Taixinlong Metal Material Processing Factory, use 2wt% absolute ethanol as a binder to brush on the surface of the mold working surface for 10 times, and the pre-coating thickness before compaction is 0.05 mm, cold pressing for 5 minutes, cold pressing pressure 1MPa, the thickness of the titanium powder layer after compaction is 5-6 microns; then put it into a vacuum induction furnace, and evacuate to 0.5Pa; use induction heating to heat the metal workpiece to 1020°C and keep it warm for 2 hours; fill it with high-purity nitrogen to 0.12MPa, and keep the temperature and nitrogen atmosphere for 8 hours. The workpiece is immersed in quenching oil at 75°C for quenching treatment; then, it is tempered...

Embodiment 3

[0041] The workpiece to be processed is a Cr5Mo1V (carbon content 1.02wt%) mold with a size of Φ100×200mm. Clean, degrease and degrease the surface of the metal workpiece in advance, and dry it at 90°C for 1 hour. Using the arc ion plating process, deposit a layer of 4-5 micron Ti coating on the outer surface of the cylindrical mold, then put it into a vacuum induction furnace, and evacuate to 0.5Pa; use induction heating to heat the metal workpiece to 960 ℃ and keep it warm for 2 hours; fill it with high-purity nitrogen to 0.1MPa, and keep the temperature and nitrogen atmosphere for 5 hours. Stop heating, evacuate to 0.1Pa again, pass nitrogen gas to 2Pa, apply bias voltage 1000V (the workpiece is connected to the negative electrode, and the furnace shell is the positive electrode), and nitrogen ions bombard the workpiece for 40 minutes. Quenching treatment by vacuum air quenching, and then tempering at 200°C for 2 hours.

[0042] In this embodiment, a titanium carbonitride...

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Abstract

The invention relates to the field of wear-resisting hard protective coatings and in particular relates to a preparation method of a titanium carbonitride protective coating used for a metal workpiece (a mould, a standard piece, a mechanical part, and the like) surface with carbon content exceeding 0.45wt%, which is used for solving the problems such as lower interface bonding strength of the coating and a base body in the prior art. The method comprises the step of forming the titanium carbonitride protective coating by mutually dispersing C in a metal workpiece base material, Ti of a metal workpiece surface pre-coated Ti powder layer or Ti coating as well as N in a high-temperature nitrogen gas atmosphere / or nitrogen ion injection under a high temperature. According to the invention, a layer of titanium powder or a coating is firstly coated on a workpiece working surface as a titanium source, carbon in the workpiece (with higher carbon content) is taken as a carbon source, the high-temperature nitrogen gas atmosphere / or nitrogen ion injection is taken as a nitrogen source to realize mutual diffusion of titanium, nitrogen and carbon under a high temperature condition, so that a layer of titanium carbonitride coating which is high in hardness, high in binding force (metallurgical combination with a base body), corrosion-resistant, wear-resistant, and long in service life is formed on a protective workpiece surface.

Description

technical field [0001] The invention relates to the field of wear-resistant hard protective coatings, in particular to a method for preparing a titanium carbonitride protective coating on the surface of metal workpieces (molds, standard parts, mechanical parts, etc.) with a carbon content exceeding 0.45wt%. . Background technique [0002] The failure of metal workpieces (molds, standard parts, mechanical parts, etc.) is mainly caused by wear. Although the traditional heat treatment method can improve the wear resistance of the workpiece, many metal materials still cannot exert their due potential due to the limited improvement of the surface hardness. Cemented carbide has high hardness and excellent wear resistance, but it is expensive, difficult to process and long in cycle, so it is difficult to be used for ordinary metal workpieces. Therefore, coating a hard protective coating on the surface of a metal workpiece can not only greatly increase the surface hardness of the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C24/08C23C14/48C23C8/24C21D1/18
Inventor 杜昊陈德志耿华彭阳李晓燕李晓东金弢宋贵宏
Owner 东莞市泰富顿纳米技术有限公司
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