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Molybdenum alloy high-temperature anti-oxidation Mo-Hf-Si coating and preparation method thereof

A high-temperature anti-oxidation, molybdenum alloy technology, applied in metal material coating process, coating, heating inorganic powder coating and other directions, to achieve excellent high-temperature oxidation resistance, uniform and dense coating structure, low production costs.

Active Publication Date: 2016-11-16
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Through the above search and analysis, it can be found that the current technology mainly focuses on the research of anti-oxidation coatings at temperatures below 1700 °C, while there are few reports and applications of high-temperature anti-oxidation coatings at temperatures above 1700 °C.

Method used

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  • Molybdenum alloy high-temperature anti-oxidation Mo-Hf-Si coating and preparation method thereof
  • Molybdenum alloy high-temperature anti-oxidation Mo-Hf-Si coating and preparation method thereof
  • Molybdenum alloy high-temperature anti-oxidation Mo-Hf-Si coating and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0059] (1) Molybdenum alloy substrate pretreatment: TZM molybdenum alloy (0.50wt% Ti, 0.08wt% Zr, 0.02wt% C, the balance is Mo) the substrate is polished with sandpaper until the surface is smooth and flat, then pickling and alkali Washing treatment, the acid composition is HCl: HNO 3 :H 2 O=1:3:16 (volume fraction), the lye composition is NaOH solution with a pH value of 11, then ultrasonically cleaned in alcohol, and then put into a drying box for drying.

[0060] (2) Slurry preparation: Mo powder and Hf powder with a particle size of 1 μm and Si powder and Al powder with a particle size of 0.5 μm 2 o 3 Powder and Y 2 o 3 The powder is composed of the following molar ratios: Mo 17%, Hf 9%, Si 69%, additives (Al 2 o 3 : Y 2 o 3 =7:1 molar ratio) 5% is put into the ball mill jar, with absolute ethanol as the ball milling medium (the ratio of the ball milling medium to the total mass of the powder is 2:1), add 0.1wt% binder PVB (polyvinyl alcohol Butyral), using Ar gas...

Embodiment 2

[0065] (1) Molybdenum alloy substrate pretreatment: TZM molybdenum alloy (0.50wt% Ti, 0.08wt% Zr, 0.02wt% C, the balance is Mo) the substrate is polished with sandpaper until the surface is smooth and flat, then pickling and alkali Washing treatment, the acid composition is HCl: HNO 3 :H 2 O=1:3:16 (volume fraction), the lye composition is a NaOH solution with a pH value of 13, then ultrasonically cleaned in alcohol, and put into a drying oven for drying.

[0066] (2) Slurry preparation: Mo powder and Hf powder with a particle size of 1 μm and Si powder and Al powder with a particle size of 0.1 μm 2 o 3 Powder and Y 2 o 3 The powder is composed of the following molar ratios: Mo 24%, Hf 8%, Si 65%, additives (Al 2 o 3 : Y 2 o 3 ==4:1 molar ratio) 3% into the ball milling tank, with distilled water as the ball milling medium (the ratio of the ball milling medium to the total mass of the powder is 1:1), adding 0.5wt% of the binder CMC (carboxymethyl Cellulose) was ball m...

Embodiment 3

[0071] (1) Molybdenum alloy substrate pretreatment: TZM molybdenum alloy (0.50wt% Ti, 0.08wt% Zr, 0.02wt% C, the balance is Mo) the substrate is polished with sandpaper until the surface is smooth and flat, then pickling and alkali Washing treatment, the acid composition is HCl: HNO 3 :H 2 O=1:3:16 (volume fraction), the lye composition is a NaOH solution with a pH value of 12, and then ultrasonically cleaned in alcohol, then put into a drying box for drying.

[0072] (2) Slurry preparation: Mo powder and Hf powder with a particle size of 3 μm and Si powder and Al powder with a particle size of 0.5 μm 2 o 3 Powder and Y 2 o 3 The powder is composed of the following molar ratios: Mo 21%, Hf 9%, Si 67%, additives (Al 2 o 3 : Y 2 o 3 ==5:1 molar ratio) 3% into the ball milling tank, with absolute ethanol as the ball milling medium (the ratio of the ball milling medium to the total mass of the powder is 3:1), adding 0.2wt% of the binder PVB (poly Vinyl butyral) was ball m...

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Abstract

The invention relates to a molybdenum alloy high-temperature anti-oxidation Mo-Hf-Si coating and a preparation method of the molybdenum alloy high-temperature anti-oxidation Mo-Hf-Si coating and belongs to the field of preparation of high-temperature anti-oxidation coatings. The coating is composed of, by mole ratio, 15-25% of Mo, 8-15% of Hf, 65-75% of Si and 2-5% of an additive. According to the molybdenum alloy high-temperature anti-oxidation Mo-Hf-Si coating and the preparation method, the coating is prepared through a slurry sintering method, a molybdenum alloy is polished, cleaned and dried, the raw materials of the coating are allocated and taken according to the design components and are ball-milled, and slurry is prepared; the surface of the molybdenum alloy is evenly coated with the slurry in a spray coating manner or dip coating manner, vacuum sintering is conducted for 20 minutes to 40 minutes at the temperature of 1,450 DEG C to 1,550 DEG C, and the coating is prepared; and the preparation process is simple, the coating is dense and even, the thermal expansion coefficient of the coating is matched with that of a molybdenum base body, and the high-temperature anti-oxidation performance of the molybdenum alloy can be improved effectively.

Description

technical field [0001] The invention belongs to the technical field of preparation of high-temperature oxidation-resistant coatings, and in particular relates to a high-temperature oxidation-resistant Mo-Hf-Si coating of a molybdenum alloy material and a preparation method thereof. Background technique [0002] Molybdenum and molybdenum alloys are important high-temperature structural materials with excellent high-temperature strength and high-temperature hardness, good thermal shock resistance, and thermal fatigue resistance. They are widely used in aviation, aerospace and nuclear industries. However, the oxidation resistance of molybdenum is extremely poor, and violent oxidation will occur at about 600 °C, which seriously restricts its engineering application in high-temperature aerobic environment. On the other hand, aviation, aerospace and nuclear industries have made remarkable progress in recent years. The speed of various types of aircraft has been continuously increa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/08
CPCC23C24/085
Inventor 肖来荣蔡圳阳张贝赵小军郭毅刘赛男朴晟铭殷景旭操沁璇
Owner CENT SOUTH UNIV
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