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Method for strengthening compounding of TiN on laser-induced metal surface layer by taking TiO2, urea and N2 as components

A laser induction and metal surface technology, applied in the coating process and coating of metal materials, can solve the problems of limited types, complex processes, and low joint surface strength, and achieve the effect of good hardness and wear resistance

Active Publication Date: 2013-03-27
路亚科消防车辆制造有限公司
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AI Technical Summary

Problems solved by technology

The PVD method has a lower formation temperature, thinner coating, low bonding strength with the substrate, easy peeling of the coating from the substrate, and poor wrapping properties
The deposition temperature of the CVD method is high, but it exceeds the heat treatment temperature of most commonly used tool materials, so the types of tool materials that can be used for coating are extremely limited; equipment, complex process and high cost, which conflicts with the green industry currently advocated
[0004] Regardless of PVD method or CVD method, the TiN coating obtained is relatively thin, with a thickness of only a few microns (μm), and the coating is mechanically bonded to the substrate, and the strength of the bonding surface is low, and the coating is prone to peeling off during use.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0018] 1. Surface treatment of Q235A, 20 steel, 40 steel, 45 steel, 20G, 20Mn, 40Mn and 60Mn carbon structural steel:

[0019] 1. Apply industrial pure TiO on the surface of carbon structural steel 2 with urea ((NH 2 ) 2 CO) mixed powder with a mass ratio of 6:4 and a thickness of 1.5 mm;

[0020] 2. With the movement of the laser spot, nitrogen gas is passed through, and the flow rate of nitrogen gas is 7L / min;

[0021] 3. The laser beam scans at a speed of 400mm / min, the laser power is 900W, the laser wavelength is 1.06μm, and the spot diameter is 2mm.

[0022] 4. Detection:

[0023] Through testing, the thickness of the above-mentioned carbon structural steels compounded with TiN in situ can reach 500 microns, and the microhardness can reach more than HV1700.

[0024] 2. Surface treatment of 20MnV, 40Cr, 35CrMoV and 20CrMnSi alloy structural steel respectively:

[0025] 1. Coating industrial pure TiO on the surface of alloy structural steel 2 with urea ((NH 2 ) ...

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Abstract

The invention discloses a method for strengthening the compounding of TiN on a laser-induced metal surface layer by taking TiO2, urea and N2 as components and relates to the technical field of metal surface strengthening processes. The method comprises the following steps of: coating the mixed powder of TiO2 and the urea on a metal surface; and scanning on the metal surface by using a laser beam at the N2 atmosphere, wherein the mixed powder of TiO2 and the urea is coated on the metal surface. Through the method, TiN can be generated on the metal surface layer through in-situ compounding so that the metal surface is strengthened and the wear resistance is improved.

Description

technical field [0001] The invention relates to the technical field of metal surface strengthening technology. Background technique [0002] Titanium nitride (TiN) is a non-stoichiometric compound, which has the characteristics of both metal crystals and covalent crystals, with a melting point as high as 2955°C. As a surface coating, TiN has excellent comprehensive mechanical properties such as high hardness, wear resistance, high temperature resistance, thermal shock resistance, and low friction coefficient. It is one of the most widely researched and applied thin film materials at present. TiN has been successfully applied to tools such as cutting tools and drills as a coating, and is considered to be a revolution in the history of metal cutting tool technology development. [0003] The preparation technologies of TiN coating are mainly physical vapor deposition (PVD) and chemical vapor deposition (CVD). The PVD method has a lower formation temperature, thinner coating, ...

Claims

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Application Information

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IPC IPC(8): C23C24/10
Inventor 王辉左健民肖圣亮张荣荣童涵
Owner 路亚科消防车辆制造有限公司
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