Method for cladding TiC enhanced Ni3Al based composite coating on surface of aluminum alloy

A technology of aluminum alloy surface and composite coating, applied in metal material coating technology, coating, metal processing equipment, etc., can solve problems such as inability to wear aluminum alloy, limited wear resistance, etc., achieve high production efficiency, Good wear resistance, uniform TiC distribution and dispersion effect

Inactive Publication Date: 2013-08-07
ZHONGYUAN ENGINEERING COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to solve technical problems such as the inability to use heat treatment to improve the wear resistance of aluminum alloys, or the use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0020] Example 1: An aluminum alloy surface cladding TiC to enhance Ni 3 The method of Al-based composite coating includes the following steps: (1) Select 7A06 super-hard aluminum as the substrate, clean the surface, and put it into a suitable argon-filled protective atmosphere container.

[0021] (2) A Ni-Cr-B-Si-based alloy and TiC powder are uniformly mixed as the coating material; the TiC content is 10 (wt)%, and the chemical composition of Ni-Cr-B-Si is 7.5 (wt). %, B is 2.5 (wt)%, Si is 4.0 (wt)%, and Ni is the balance.

[0022] (3) A laser beam is used to form a molten pool on the surface of the aluminum alloy base metal; the laser treatment process parameters are laser spot diameter 6mm, power 1.2kW, and beam scanning speed 8mm / s.

[0023] (4) The coating material is sent into the molten pool to form a metallurgical bond with the base metal, and the chemical exothermic reaction between Ni and Al is used, and after the reaction, TiC is formed to enhance Ni 3 Al-based composite...

Example Embodiment

[0025] Example 2: An aluminum alloy surface cladding TiC to enhance Ni 3 The method of Al-based composite coating includes the following steps: (1) Select 2A12 duralumin as the substrate, clean the surface, and put it in a suitable argon-filled transparent protective atmosphere device.

[0026] (2) Ni-Cr-B-Si base alloy and TiC powder are uniformly mixed as the coating material; the TiC content is 12 (wt)%, and the chemical composition of Ni-Cr-B-Si is 7.5 (wt)%. , B is 2.5 (wt)%, Si is 4.0 (wt)%, and Ni is the balance.

[0027] (3) A laser beam is used to form a molten pool on the surface of the aluminum alloy base metal; the laser treatment process parameters are laser spot diameter 8mm, power 1.5kW, and beam scanning speed 10mm / s.

[0028] (4) The coating material is sent into the molten pool to form a metallurgical bond with the base metal, and the chemical exothermic reaction between Ni and Al is used, and after the reaction, TiC is formed to enhance Ni 3 Al-based composite coat...

Example Embodiment

[0029] Example 3: A kind of aluminum alloy surface cladding TiC to enhance Ni 3 The method of Al-based composite coating includes the following steps: (1) cleaning the surface of the aluminum alloy base metal to remove oil stains and oxide layers; (2) uniformly mixing Ni-based materials and TiC powders as coating materials; among them, Ni The weight content of Ni element in the base material is more than 75%, and the content of TiC in the coating material is 8-20 (wt)%; (3) In the argon protection device, a laser beam is used to form a molten pool on the surface of the aluminum alloy base metal; (4) The coating material is sent into the molten pool to form a metallurgical bond with the aluminum alloy base metal, and the chemical exothermic reaction between Ni and Al is used to form TiC reinforced Ni after the reaction 3 Al-based composite coating.

[0030] The laser processing process parameters are laser spot diameter 4-8mm, power 1.2-2kW, beam scanning speed 3-10mm / s.

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Abstract

The invention relates to a method for cladding TiC enhanced Ni3Al based composite coating on the surface of aluminum alloy. The method comprises the following steps of: (1) cleaning the surface of aluminum alloy matrix metal and removing greasy dirt and an oxidation layer; (2) uniformly mixing a Ni-based material with TiC powder to serve as a coating material, wherein the weight content of the Ni element of the Ni-based material is over 75 percent; (3) forming a molten bath on the surface of the aluminum alloy matrix metal by using laser beams in an argon protection device; and (4) conveying the coating material into the molten bath to form metallurgical bonding with the aluminum alloy matrix metal, and performing chemical exothermic reaction between Ni and Al to form the TiC enhanced Ni3Al based composite coating. The method has the characteristics of stable preparation process, basic avoidance of sputtering or burning loss, high production efficiency and the like. The prepared TiC enhanced Ni3Al based composite coating cladded on the surface of aluminum alloy has the advantages of good surface quality, uniform TiC distribution and diffusion, tiny crystal particles, metallurgical bonding with the matrix, high wear resistance and the like.

Description

technical field [0001] The invention belongs to the field of high-energy beam surface modification, in particular to a method for aluminum alloy laser surface treatment. Background technique [0002] Aluminum alloy is one of the most widely used materials in non-ferrous metals. Aluminum alloy has many excellent properties such as low density, high specific stiffness and specific strength, easy processing, high thermal conductivity, and high electrical conductivity. It is used in engine pistons, optical precision instruments, Locomotive carriages have been successfully applied. In order to reduce weight, reduce energy consumption, improve efficiency and enhance maneuverability, aluminum is used to replace copper or even steel as much as possible. In the field of automobile industry, the amount of aluminum alloy used in western developed countries is gradually increasing. However, the surface hardness of aluminum alloy is low, the friction coefficient is high, the wear is lar...

Claims

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Application Information

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IPC IPC(8): C23C24/10B23K26/34
Inventor 卢金斌王志新张旺玺赵彬彭竹琴
Owner ZHONGYUAN ENGINEERING COLLEGE
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