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Heat treatment method for hot-dip aluminized coating

A heat treatment method, hot-dip aluminum coating technology, applied in the hot-dip coating process, coating, metal material coating process, etc., can solve the problems of non-penetrating micro-cracks and coating micro-cracks that cannot be completely eliminated

Inactive Publication Date: 2014-12-24
SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The inspection time of the hot-dip aluminum coating on the surface of γ-TiAl has reached 1000 hours. The thermal stability of the coating is good. The disadvantage is that there are micro-cracks inside the coating, and some cracks are penetrating.
Adding Si, Mn, Ag and other elements separately to the hot-dip aluminum coating on the surface of titanium alloy can improve the appearance and structure of the coating, but cannot completely eliminate the formation of non-penetrating micro-cracks

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The γ-TiAl (the main composition of the alloy is Ti-45Al-2Cr-2Nb-0.15B, atomic percent) alloy is subjected to hot-dip aluminum plating treatment, the sample is sealed in a quartz tube, and the gas is pumped before closing the quartz tube, so that Its internal pressure reaches below 2 Pa. Put this closed quartz tube into a box-type resistance furnace for heat treatment. The program temperature control system in the heat treatment process is as follows:

[0021] to 10 o The rate of C / min raises the temperature of the system from room temperature to 500 o C, at 500 o C for 300 min, then with 2 o The rate of C / min changes the temperature of the system from 500 o C raised to 600 o C, at 600 o C for 120 min, and finally with 15 o The rate of C / min changes the temperature of the system from 600 o C was lowered to room temperature.

Embodiment 2

[0023] Industrial pure titanium (alloy grade TA2) is subjected to hot-dip aluminizing treatment, the sample is placed in a quartz tube, and air dried with phosphorus pentoxide is passed into it from one end of the quartz tube, and the gas flows out from the other end. Place the quartz tube in a tube resistance furnace for heat treatment. The program temperature control system in the heat treatment process is as follows:

[0024] to 15 o The rate of C / min raises the temperature of the system from room temperature to 650 o C, at 650 o C for 360 min, and then 5 o The rate of C / min changes the temperature of the system from 650 o C raised to 750 o C, at 750 o C for 120 min, and finally with 20 o The rate of C / min changes the temperature of the system from 750 o C was lowered to room temperature.

Embodiment 3

[0026] The Ti-6Al-4V (alloy grade is TC4) alloy is subjected to hot-dip aluminizing treatment, the sample is put into a quartz tube, and argon gas from a commercially available steel cylinder is passed into it from one end of the quartz tube, and the gas flows out from the other end. Place the quartz tube in a tube resistance furnace for heat treatment. The program temperature control system in the heat treatment process is as follows:

[0027] to 20 o The rate of C / min increases the temperature of the system from room temperature to 600 o C, at 600 o C for 360 min, and then 5 o The rate of C / min changes the temperature of the system from 600 o C raised to 700 o C, at 700 o C for 60 min, and finally with 15 o The rate of C / min changes the temperature of the system from 700 o C was lowered to room temperature.

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Abstract

The invention discloses a heat treatment method for a hot-dip aluminized coating and relates to a treatment method for an alloy coating. The invention provides a method for converting a hot-dip aluminized coating on the surface of a titanium alloy to a titanium-aluminum protective coating under the conditions of program temperature control and control of a heat treatment atmosphere, wherein the control of the heat treatment atmosphere comprises two situations, one situation is that heat treatment is performed on the hot-dip aluminized coating under vacuum conditions, and the other situation is that the heat treatment is performed on the hot-dip aluminized coating under the conditions of removing water vapor in a system. The program temperature control refers to regulation of the temperature on the part on which the hot-dip aluminized coating is located according to a certain order. Through the method, when the hot-dip aluminized coating on the surface of the titanium alloy is converted to the titanium-aluminum protective coating, the continuous and complete state can be kept, common microcracks in the titanium-aluminum coating are eliminated and the titanium alloy can be further effectively protected.

Description

technical field [0001] The invention relates to a treatment method of an alloy coating, in particular to a heat treatment method of a hot-dip aluminized coating. Background technique [0002] Titanium alloys are considered ideal materials for the aerospace and automotive industries due to their light weight and high strength at high temperatures. Some gas turbines have begun to use titanium alloys, and the engine efficiency has been improved. Research and development is underway to develop a supersonic combustion ramjet engine made of titanium alloys. However, the oxidation performance of titanium alloys becomes poor at high temperatures, which limits the application of titanium alloys. The maximum temperature at which titanium alloys can maintain thermal stability is lower than the maximum temperature at which they can maintain effective mechanical properties. In order to improve the high-temperature oxidation performance of titanium alloy and increase the service temper...

Claims

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Application Information

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IPC IPC(8): C23C2/28
Inventor 张志刚
Owner SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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