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A kind of preparation method of high temperature protective coating

A protective coating, high temperature technology, applied in the coating, metal material coating process, solid diffusion coating and other directions, can solve the problems of high surface roughness of the coating, limited shape and size of the workpiece, and high metal ionization rate. Achieving good comprehensive performance, improving coating cracking problems, and high preparation efficiency

Active Publication Date: 2022-05-27
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has a high metal ionization rate and a fast deposition rate, but this method is limited by the closed environment, the shape and size of the workpiece are limited, the thickness of the prepared coating is thin, the service life is short, and the surface roughness of the coating is high.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) The commercially available Ti3Al powder is sieved through a metal sieve to obtain a Ti3Al powder with an average particle size of 80 μm;

[0031] (2) The Ti3Al powder obtained in step (1) is placed in the powder feeder of the laser rapid prototyping system, and a certain proportion of the nitrogen and argon mixture gas is the powder carrier gas and the protective gas, the nitrogen in the mixed gas accounts for 60%, the powder carrier gas flow rate is 8L / min, and the protective gas flow rate is 25L / min;

[0032] (3) Take 100mm×100mm×5mm TC4 titanium alloy as the forming substrate, and preheat the substrate at a preheating temperature of 200 °C;

[0033] (4) The laser and powder are sent coaxially, and synchronously move, and only one channel is scanned in one direction, the powder feeding rate is 10g / min, the laser power is 600W, the laser is in the out-of-focus state, the out-of-focus distance is 5mm, the laser scanning rate is 900mm / min, under the action of the laser, ...

Embodiment 2

[0040] (1) The commercially available Ti3Al powder is sieved through a metal sieve to obtain a Ti3Al powder with an average particle size of 90 μm;

[0041] (2) The Ti3Al powder obtained in step (1) is placed in the powder feeder of the laser rapid prototyping system, and a certain proportion of the mixture of nitrogen and argon is the powder-carrying gas and protective gas, the nitrogen in the mixed gas accounts for 40%, the flow rate of the powder-carrying gas is 6L / min, and the protective airflow rate is 20L / min;

[0042] (3) Take 100mm×100mm×5mm TC4 titanium alloy as the forming substrate, and preheat the substrate at a preheating temperature of 200 °C;

[0043] (4) The laser and powder are sent coaxially, and synchronously move, and only one channel is scanned in one direction, the powder feeding rate is 7.5g / min, the laser power is 900W, the laser is in the out-of-focus state, the out-of-focus distance is 7mm, the laser scanning rate is 1000mm / min, under the action of the la...

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Abstract

The invention belongs to the technical field of preparation of high-temperature protective coatings, and in particular relates to a preparation method of high-temperature protective coatings. Using laser as the energy source, using powder-feeding laser rapid prototyping equipment, by setting reasonable process parameters, using commercially available Ti3Al powder as raw material, directly melting and depositing TiAlN coating on the preheated forming substrate, the obtained TiAlN The coating is dense and free of defects, and the nitrides in the coating mainly exist in the form of dendrites. The process of preparing the TiAlN coating by the method does not require a mold, the coating has good forming quality, uniform structure and good comprehensive mechanical properties.

Description

Technical field [0001] The present invention belongs to the field of preparation technology of high temperature protective coatings, involving a powder feeding type laser rapid forming technology, specifically related to a preparation method of high temperature protective coatings, in particular to a TiAlN high temperature protective coating preparation method. Background [0002] In order to meet the requirements of aerospace-related materials to serve at high temperatures, high-temperature protective coatings have been widely used in this field. Nitride dura film layer has become a hot research topic at home and abroad because of its potential for high hardness, high wear resistance, high melting point, good thermal stability, superior high temperature strength and excellent chemical inertness. At present, the industrialized and widely used nitride hard coating is TiN coating. The coating has good wear resistance and mechanical properties, but when the use temperature reaches t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C24/10C23C8/24
CPCC23C24/103C23C8/24
Inventor 孙兵兵赵梓钧刘伟雷杨熊华平周标
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS