High temperature anti-oxidation coating molybdenum material and preparation method thereof

A high-temperature anti-oxidation and anti-oxidation coating technology, applied in the direction of coating, metal material coating process, solid-state diffusion coating, etc., can solve the problem of general high-temperature oxidation resistance, poor thermal matching between coating and substrate, and complex preparation process and other problems, to achieve the effects of easy control of structure and phase state, excellent high temperature oxidation resistance, and simple preparation process

Active Publication Date: 2012-07-04
XIAMEN HONGLU TUNGSTEN MOLYBDENUM IND CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The patent (Oxidation Protective Coating for Refractory Metals, US 6,214,474B1) uses plasma spraying and heat treatment to introduce other elements to reduce the thermal matching difference between the substrate and the coating material, and at the same time, introduce a barrier layer between the substrate and the coating (such as ZrO 2 , NbC, MoC, etc.), which effectively alleviates the coating degradation caused by the diffusion between the substrate and the coating interface, and this method can be applied to various alloy substrates such as niobium alloys, molybdenum alloys, etc., but this method exists The production cost is high, and the high temperature oxidation resistance of the product is average
[0005] In the above-mentioned prior art, there are problems such as complex preparation process, high cost, poor compactness of the coating, poor thermal matching between the coating and the substrate, and difficulty in controlling the structure and phase of the coating, thus directly affecting the metal molybdenum. high temperature service life

Method used

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  • High temperature anti-oxidation coating molybdenum material and preparation method thereof
  • High temperature anti-oxidation coating molybdenum material and preparation method thereof
  • High temperature anti-oxidation coating molybdenum material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Pretreatment of metal molybdenum base material: the metal molybdenum base material is polished with sandpaper until the surface is smooth and flat, and put into absolute ethanol or ethanol solution for degreasing and degreasing treatment, then dried and set aside.

[0030] (2) Nitriding treatment: place the pretreated metal molybdenum substrate in an atmosphere furnace, and raise the temperature to 800°C at a rate of 5°C / min under a 99.99% high-purity nitrogen atmosphere with a flow rate of 500mL / min. After heat preservation at 800°C for 24 hours, it was cooled to room temperature with the furnace, then taken out, cleaned with ultrasonic waves for 5-10 minutes, and dried to obtain a semi-finished product A with a molybdenum nitride coating on the molybdenum surface. Its diffraction spectrum and cross-sectional appearance are as follows: figure 2 , image 3 shown.

[0031] (3) Silicification treatment: Put the semi-finished product A into a high-purity alumina cruc...

Embodiment 2

[0034] (1) Pretreatment of metal molybdenum base material: the metal molybdenum base material is polished with sandpaper until the surface is smooth and flat, and put into absolute ethanol or ethanol solution for degreasing and degreasing treatment, then dried and set aside.

[0035] (2) Nitriding treatment: place the pretreated metal molybdenum substrate in an atmosphere furnace, and raise the temperature to 1400°C at a rate of 15°C / min under a 99.99% high-purity nitrogen atmosphere with a flow rate of 50mL / min. After heat preservation at 1400°C for 1 hour, it was cooled to room temperature with the furnace, then taken out, cleaned with ultrasonic waves for 5-10 minutes, and dried to obtain a semi-finished product A with a molybdenum nitride coating on the molybdenum surface.

[0036] (3) Silicification treatment: Put the semi-finished product A into a high-purity alumina crucible equipped with a uniformly mixed siliconization agent, which contains silicon powder, NaF, Al 2 o...

Embodiment 3

[0039] (1) Pretreatment of metal molybdenum base material: the metal molybdenum base material is polished with sandpaper until the surface is smooth and flat, and put into absolute ethanol or ethanol solution for degreasing and degreasing treatment, then dried and set aside.

[0040] (2) Nitriding treatment: place the pretreated metal molybdenum substrate in an atmosphere furnace, and raise the temperature to 1000°C at a rate of 10°C / min under a 99.99% high-purity nitrogen atmosphere with a flow rate of 200mL / min. After heat preservation at 1000°C for 10 hours, it was cooled to room temperature with the furnace, then taken out, cleaned with ultrasonic waves for 5-10 minutes, and dried to obtain a semi-finished product A with a molybdenum nitride coating on the molybdenum surface.

[0041] (3) Silicification treatment: Put the semi-finished product A into a high-purity alumina crucible equipped with a uniformly mixed siliconization agent, which contains silicon powder, NaF, Al ...

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Abstract

The invention discloses a high temperature anti-oxidation coating molybdenum material and a preparation method thereof. The surface of a product is provided with a Mo-N-Si-B anti-oxidation coating which is synthesized by adopting a three-step in situ synthesis method. Compared with the prior art, the product has good high temperature anti-oxidation performance and is good in material compactness, and hot matching performance between the coating and a base body is good. The preparation method does not need expensive devices such as plasma spraying, chemical vapor deposition or infiltration, avoids a complex process of a slurry method and is simple in preparation process, low in production cost and easy in controlling of coating structures and phase states.

Description

technical field [0001] The invention belongs to the field of coating preparation, and in particular relates to a molybdenum material for a high-temperature anti-oxidation coating and a preparation method thereof. Background technique [0002] Metal molybdenum has the advantages of strong tensile strength and creep strength, good heat resistance, low thermal expansion coefficient, high thermal conductivity and electrical conductivity at high temperature, but its high temperature oxidation resistance is poor, and the temperature in the air is high. Oxidation occurs at 630°C, and as the temperature increases, the degree of oxidation intensifies, resulting in embrittlement of molybdenum and structural failure of molybdenum when used at high temperatures, which greatly limits the use of molybdenum as a high-temperature material. Therefore, the high-temperature oxidation resistance of molybdenum has always been a difficult problem to be solved by material workers, molybdenum produ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C12/00
Inventor 张厚安于洋古思勇谭华李月婵施钢
Owner XIAMEN HONGLU TUNGSTEN MOLYBDENUM IND CO LTD
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