Preparation method of impregnation coating based on powder embedding

A technology of powder embedding and infiltration coating, applied in the direction of coating, metal material coating process, solid diffusion coating, etc., to slow down the mutual diffusion of elements, prolong the service life at high temperature, and prevent decarburization and oxidation.

Active Publication Date: 2021-05-28
EAST CHINA UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This application can improve the quality of powder embedding infiltration layer, solve the problem of infiltration agent consolidation, improve product quality and production efficiency, and is suitable for production and industrial application

Method used

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  • Preparation method of impregnation coating based on powder embedding
  • Preparation method of impregnation coating based on powder embedding
  • Preparation method of impregnation coating based on powder embedding

Examples

Experimental program
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Embodiment 1

[0025] The workpiece material is Cr25Ni35 alloy, and the coating preparation process is as follows:

[0026] Step (1): The co-infiltration agent (aluminum powder 45%, ammonium chloride: 2%; cerium rare earth 5%, silicon powder: 1%; graphite powder 0.2%; aluminum oxide: the balance) is weighed according to the proportion , Stir and mix it, put it into a ball mill for ball milling and mixing for 2 hours, the rotation speed is 300r / min, and the ball-to-material ratio is 1:2.

[0027] Step (2): Grind the workpiece to 2000# with silicon carbide sandpaper, and ultrasonically clean it with absolute ethanol.

[0028] Step (3): Embed the workpiece in the infiltration agent and compact it, and fill the connection between the infiltration box body and the box cover with high-temperature refractory mud, and then put it in an oven to dry at 80°C for 2 hours.

[0029] Step (4): Put the infiltration box in a heat treatment furnace, heat it at 10°C / min to 750°C for 5 hours, and take it out a...

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Abstract

The invention relates to a preparation method of an impregnation coating based on powder embedding. The preparation method comprises the following steps: performing ball milling on metallic powder, aluminum oxide, an activating agent, silicon powder, rare earth and graphite powder and uniformly mixing the materials; putting workpieces and impregnation agents subjected to ball milling into an impregnation box, and sealing the impregnation box; putting the impregnation box into thermal treatment for heating and then performing element diffusion and impregnation chemical thermal treatment so as to obtain a coating with compact and flat surface, and the thickness of the impregnation coating can be up to 100 micrometers. According to the preparation method disclosed by the invention, graphite can be added into the impregnation agents, so that high-temperature consolidation of the impregnation agents can be effectively prevented, and the surface quality of the coating is improved; and because of addition of the silicon powder and the rare earth, the structure property of the coating can be further improved.

Description

【Technical field】 [0001] The invention relates to the technical field of alloy surface coating, in particular to a method for preparing a powder embedded infiltration coating. 【Background technique】 [0002] Coating preparation by powder embedding and infiltration is a chemical heat treatment process in which metal atoms penetrate into the surface layer of the workpiece. Put the workpiece in the infiltrating agent containing the element to be infiltrated, heat it to a certain temperature and keep it for an appropriate time, the active atoms generated by the thermal decomposition of the infiltrating agent will be adsorbed on the surface of the workpiece and diffuse into the surface of the workpiece, thereby changing the chemical composition of the surface of the workpiece , organization and performance. Generally, a metal-rich layer or a compound layer is formed on the surface of the material to change the surface characteristics of the workpiece so that it has good properti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C10/52
CPCC23C10/52
Inventor 刘京雷王浩张永军孙恩浩王响响徐宏
Owner EAST CHINA UNIV OF SCI & TECH
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