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Induction-cladded gradient hard composite material coating technique

A composite material, hard technology, applied in the direction of metal material coating process, coating, fusion spraying, etc., can solve the problems of coating hard phase growth, Cokendall diffusion pores, restrictions, etc., to improve resistance The ability of thermal shock, avoiding the deterioration of matrix structure, and the effect of simple preparation method

Active Publication Date: 2015-09-09
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the high-temperature thermal diffusion treatment method of the overall heating gradient coating can lead to significant changes in the metallographic structure of the metal parts and components. Application of heating and sintering coating densification method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Utilize the present invention to prepare 600 μm thick gradient hard composite material coating with WC hard phase and Ni-based self-fluxing alloy on the surface of AISI 304L austenitic stainless steel plate parts. The preparation steps are as follows: first, the spray drying method is used to prepare WC Three kinds of composite spraying powder with hard phase volume percentage of 0%, 25% and 50%; do routine cleaning treatment on the surface of AISI 304L stainless steel substrate to be treated, remove surface oil and impurities, and use 60 mesh corundum sand for 10 seconds / cm 2;Using the oxyacetylene flame spraying method, three kinds of composite spraying powders with WC hard phase volume percentage of 0%, 25% and 50% were sprayed layer by layer, and a 3-sublayer structure prefabricated with each sublayer thickness of 200 μm was obtained. Coating: use a rectangular induction coil 5 mm larger than the width of the part to scan and heat cladding, the output power of the ...

Embodiment 2

[0016] Utilize the present invention to prepare 450 μm thick with Cr 3 C 2 Gradient hard composite coating of hard phase and NiCr metal phase, the preparation steps are as follows: first, adopt the spray drying method to prepare Cr 3 C 2 Three kinds of composite powders with hard phase volume percentages of 20%, 40% and 80%; do conventional cleaning treatment on the surface of SA182M-F304 stainless steel substrate to be treated, remove surface oil and impurities, and use 60 mesh corundum sand for 10 seconds / cm 2 ; Using oxyacetylene flame flame spraying method, spraying Cr layer by layer 3 C 2 Three kinds of composite powders with hard phase volume percentage of 20%, 40% and 80% were used to obtain a three-sub-layer structure pre-coating with each sub-layer thickness of 150 μm; a circular induction coil with an inner diameter of 104 mm was used to induce The output power of the power supply is 100 kW, the frequency is 60 kHz, and the maximum current is 2500 A. The sphere...

Embodiment 3

[0018] Utilize the present invention to prepare on the 17-4PH martensitic stainless steel cylinder part of diameter 30mm, length 100mm, have 360 ​​μ m thick graded hard composite material coating with WC hard phase and Ni base self-fluxing alloy, preparation steps are as follows : Firstly adopt spray drying method to prepare two kinds of composite spraying powders with WC hard phase volume percentage of 35% and 85%; do routine cleaning treatment on the surface to be treated of 17-4PH martensitic stainless steel substrate to remove surface oil and impurities, Use 46 mesh corundum sand blasting treatment for 10 seconds / cm 2 ;Using the supersonic spraying method, two kinds of composite powders with WC hard phase volume percentages of 35% and 85% were sprayed and deposited respectively, and the first sub-layer thickness was 120 μm, and the second sub-layer thickness was 240 μm. Sub-layer structure pre-coating; using a circular induction coil with an inner diameter of 36 mm, the ou...

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Abstract

The invention discloses an induction-cladded gradient hard composite material coating technique, and belongs to the technical field of material surface engineering. The surface of a metal part is pre-coated with a gradient coating, a hard phase and a metal phase of the gradient coating are composited, the pre-coating has element gradient distribution that the content of the hard phase increases gradually from an inner layer to an outer layer, the volume percent of the hard phase ranges from 0% to 90%, the pre-coating is inductively heated and re-melted in a protective atmosphere, and a continuous gradient hard composite material coating, which is combined with the base body interface of the metal part and is compact and flawless, is formed through mutual diffusion of the layers. By the gradient hard composite material pre-coating, the problems such as overhigh heat stress caused by conventional metallurgical bonding of induction-cladded hard coatings, concentrated coating impact heat stress caused by cladding of laser beams, electron beams and plasma beams and base body structure degradation caused by overall coating heating, brazing and sintering of the part are solved; the continuous gradient hard composite material coating meets requirements on high performance such as wear, corrosion and impact resistance of the part.

Description

technical field [0001] The invention relates to an induction cladding gradient hard composite material coating process, which is used for high-performance service requirements such as wear resistance, corrosion resistance and impact resistance of metal and metal matrix composite parts, and belongs to the technical field of material surface engineering. technical background [0002] With the continuous increase of high-performance requirements for key parts of equipment in aerospace, nuclear power, chemical industry and other fields, such as wear resistance, corrosion resistance, erosion resistance, fatigue resistance and oxidation resistance, the most effective solution is to prepare ceramic hard parts on the surface of the parts. The metal-based hard composite material coating with phase reinforcement meets the performance requirements of high reliability and long-term service of parts. At present, the main preparation methods include thermal spraying, cold spraying, etc....

Claims

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Application Information

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IPC IPC(8): C23C24/10C23C4/12C23C4/18C23C4/06
Inventor 雷明凯朱小鹏王桂芹李昱鹏林莉
Owner DALIAN UNIV OF TECH
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