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Antioxidant coating and method of preparing molybdenum boride on surface of molybdenum-based alloy

A technology of anti-oxidation coating and molybdenum-based alloy, which is applied in the direction of coating, metal material coating process, solid-state diffusion coating, etc., can solve the problems of performance impact, product strength decrease, loss increase, etc., to improve low temperature resistance The effect of oxidation properties

Inactive Publication Date: 2017-12-29
张家港市思杰五金工具有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although metal molybdenum and its alloys are good materials for preparing high-temperature furnace heating elements and structural parts, they will be violently oxidized when the temperature is above 600°C in the air. As the temperature increases, the strength of its products decreases and the loss increases. The service performance is affected, which seriously restricts the application of molybdenum and its alloys

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Method for preparing molybdenum boride coating on the surface of molybdenum-based alloy by in-situ chemical vapor deposition

[0024] (1), mix boron powder, sodium fluoride and alumina, place in ball mill and mix materials for 24 hours, obtain mixed powder, wherein boron powder content is 0.7wt.%, sodium fluoride content is 15wt.%, alumina The content is 84.3wt.%;

[0025] (2) Dry the mixed powder at a constant temperature of 60°C for 12 hours to obtain powder feed;

[0026] (3) Surface treatment of molybdenum-based alloys, including sandblasting, ultrasonic cleaning, and degreasing in sequence;

[0027] (4) Put the powder feed and molybdenum-based alloy in a tube furnace, under the protection of argon, heat up to 900-1000°C at a rate of 10°C / min for pretreatment for 15-20 hours, cool to room temperature, and A molybdenum boride layer is prepared on the surface of the molybdenum substrate.

[0028] In step (2), the sandblasting method includes: using brown corundum s...

Embodiment 2

[0032] Method for preparing molybdenum boride coating on the surface of molybdenum-based alloy by in-situ chemical vapor deposition

[0033] (1), mix boron powder, sodium fluoride and alumina, place in ball mill and mix materials for 24 hours, obtain mixed powder, wherein boron powder content is 0.85wt.%, sodium fluoride content is 15wt.%, alumina The content is 84.15wt.%;

[0034] (2) Dry the mixed powder at a constant temperature of 60°C for 12 hours to obtain powder feed;

[0035] (3) Surface treatment of molybdenum-based alloys, including sandblasting, ultrasonic cleaning, and degreasing in sequence;

[0036] (4) Put the powder feed and molybdenum-based alloy in a tube furnace, under the protection of argon, heat up to 900-1000°C at a heating rate of 8°C / min for pretreatment for 20 hours, cool to room temperature, and place on the molybdenum matrix A molybdenum boride layer is prepared on the surface.

[0037] In step (2), the sandblasting method includes: using brown c...

Embodiment 3

[0039] Method for preparing molybdenum boride coating on the surface of molybdenum-based alloy by in-situ chemical vapor deposition

[0040] (1), mix boron powder, sodium fluoride and alumina, place in ball mill and mix materials for 24 hours, obtain mixed powder, wherein boron powder content is 0.75wt.%, sodium fluoride content is 15wt.%, alumina The content is 84.25wt.%;

[0041] (2) Dry the mixed powder at a constant temperature of 60°C for 10 hours to obtain powder feed;

[0042] (3) Surface treatment of molybdenum-based alloys, including sandblasting, ultrasonic cleaning, and degreasing in sequence;

[0043] (4) Put the powder feed and molybdenum-based alloy in a tube furnace, and under the protection of argon, raise the temperature to 900-1000°C at a rate of 8°C / min for pretreatment for 18 hours, cool to room temperature, and place on the molybdenum matrix A molybdenum boride layer is prepared on the surface.

[0044] In step (2), the sandblasting method includes: usi...

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Abstract

The application discloses an antioxidant coating and a method of preparing molybdenum boride on the surface of a molybdenum-based alloy. The method comprises the following steps of: (1) mixing boron powder, sodium fluoride and aluminum oxide, and putting the mixture in a ball mill to be mixed for 24h to obtain mixed powder; (2) drying the mixed powder at a constant temperature of 50-60 DEG C for 10-12h to obtain a powder feed; (3) performing molybdenum-based alloy surface treatment, including abrasive blasting, ultrasonic cleaning and deoiling, successively; and (4) putting the powder feed and the molybdenum-based alloy in a tubular furnace, raising the temperature to 900-1000 DEG C at 8-10 DEG C / min for pretreatment for 15-20h, cooling the temperature to room temperature, and preparing the molybdenum boride coating on the surface of a molybdenum base. The molybdenum boride coating obtained by the invention has very high hardness and elastic modulus which are separately HV3130 and 520GPa. The oxidation rate constant is 0.22mg<2>(cm<4>.h) after the molybdenum boride coating is oxidized for 100h at 600 DEG C, and the low-temperature antioxidant performance of molybdenum is improved.

Description

technical field [0001] The application relates to an anti-oxidation coating and a method for preparing a molybdenum boride coating on the surface of a molybdenum-based alloy. Background technique [0002] Metal molybdenum and its alloys have the advantages of high strength, high melting point, corrosion resistance and wear resistance, and are used to manufacture alloy components and parts of warships, tanks, guns, rockets, and satellites. In addition, metal molybdenum and its alloys are often used to manufacture heating elements and structural materials for high-temperature furnaces, such as electrodes for furnaces and high-temperature structural materials for glass melting in the glass and refractory fiber industries, and electrodes and smelting materials in the rare earth industry. Stirring stick etc. [0003] Although metal molybdenum and its alloys are good materials for preparing high-temperature furnace heating elements and structural parts, they will be violently oxi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/68C23C8/02
CPCC23C8/68C23C8/02
Inventor 范佳晨
Owner 张家港市思杰五金工具有限公司
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