A kind of preparation method of cermet coating with intermetallic compound as bonding phase

A technology of intermetallic compound and cermet coating, which is applied in the fields of metallurgy, electric power, material processing, machinery, and chemical industry. It can solve the problems of grain growth, slow deposition coating speed, and difficulty in effectively depositing coatings, etc., to achieve high The effect of superior wear resistance, structure and corrosion wear resistance

Inactive Publication Date: 2011-12-28
JIUJIANG UNIVERSITY
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  • Summary
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AI Technical Summary

Problems solved by technology

The composition distribution of intermetallic compound coatings prepared by hot-dipping plating is limited by thermodynamic and kinetic conditions. Physical vapor deposition prepares intermetallic compounds, and the deposition speed of the coating is slow. Although laser cladding can refine the structure, the cooling speed is fast. , the solidification process is difficult to control, because the traditional thermal spraying method uses a high-temperature heat source, there are inevitably some problems such as oxidation, phase change, decomposition and grain growth when preparing the coating.
In addition, due to the characteristics of low temperature and high speed, the new cold spraying technology can prepare dense and non-oxidized metal coatings, but it is difficult to effectively deposit coatings due to the room temperature brittleness of intermetallic compounds and the high volume fraction of hard ceramic phases in cermet powders , therefore, the above methods are difficult to prepare cermet coatings with intermetallic compounds as the bonding phase

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0023] Example 1: Preparation of FeAl-40WC (vol.%) cermet coating with FeAl intermetallic compound as binder phase and nano-WC as reinforcement phase.

[0024] Select conventional micron-sized WC powder (15-45 microns), put the powder into a ball mill tank, and use ethanol as the process control agent for wet ball milling. The ball-to-material ratio is 20:1, the speed is 250 rpm, and the ball milling time is 72 hours. Sieve the above ball-milled WC powder to obtain nanoscale WC powder (25-50nm), then select Fe powder and Al powder, mix 500 g according to the molar ratio of 1:1, and add 40% (volume fraction) of the above nanometer WC powder, after mixing evenly, carry out ball milling in a ball milling tank, the ball to material ratio is 10:1, the speed is 180 rpm, and the ball milling time is 36 hours to obtain Fe(Al) / WC based on metastable structure Fe(Al) solid solution Metal / ceramic composite powder. The powder is taken out and heat-treated at 300°C and sieved to obtain a ...

example 2

[0025] Example 2: FeAl intermetallic compound as binder phase, micron Al 2 o 3 FeAl-60Al as reinforcement phase 2 o 3 (vol.%) Cermet coating preparation.

[0026] Select Fe powder and Al powder, mix 500 g according to the molar ratio of 1:1, and add 20% (volume fraction) micron Al 2 o 3 (5-10 microns) powder, after mixing evenly, carry out ball milling in a ball milling tank, the ball-to-material ratio is 20:1, and the speed is 220 rpm. After 12 hours and 24 hours of ball milling, open the ball milling tank and add 20% ( volume fraction) μm Al 2 o 3 powder, after ball milling for 36 hours, Fe(Al) / Al based on metastable structure Fe(Al) solid solution was obtained 2 o 3 Metal / ceramic composite powder. Take out the powder for heat treatment at 250°C and sieve to obtain a powder with a particle size of about 15-25 microns, and cold spray to deposit a metastable structure under the conditions of spraying gas of nitrogen, pressure of 2.0MPa, spraying temperature of 500°C, ...

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PUM

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Abstract

The invention discloses a structure design and preparation method of a metal-ceramic coating with an intermetallic compound as a binding phase, which adopts a mechanical alloying process to prepare a metastable structure metal / ceramic composite powder with a high volume fraction of a ceramic hard phase. By cold spraying the precipitation coating and heat treatment process, the in-situ generation of the intermetallic compound binder phase and the control of the interface between the particle interface, the ceramic hard phase and the binder phase interface are used to obtain the intermetallic compound-based metal with controllable interface bonding. Ceramic coating. The intermetallic compound-based cermet coating prepared by the method has the structural characteristics of high volume fraction of ceramic hard phase, good dispersibility, in-situ generation of intermetallic compound binding phase and controllable bonding of particle interface.

Description

technical field [0001] The invention relates to the fields of material processing, metallurgy, machinery, electric power, chemical industry, etc., and in particular to a preparation method of a cermet coating with intermetallic compounds as the binding phase, which has both high temperature wear resistance and corrosion resistance. Background technique [0002] Cermet, which is composed of metal or alloy as the binder phase and ceramic particles, is one of the widely used overall wear-resistant materials and part surface strengthening coating materials. It is obtained in mining, oil drilling and other construction machinery parts and various cutting tools. widely used. However, under the conditions of high-temperature oxidation, corrosion and wear, traditional cermets have problems such as insufficient high-temperature oxidation-corrosion wear resistance due to their low corrosion resistance of Co, Ni and other bonding phases. [0003] Intermetallic compounds such as FeAl, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/00B22F1/00
Inventor 王洪涛纪岗昌陈枭陈清宇
Owner JIUJIANG UNIVERSITY
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