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A kind of tantalum alloy surface modified composite HF-TA coating and preparation method thereof

A surface modification and tantalum alloy technology is applied in the field of tantalum alloy surface modification composite Hf-Ta coating and its preparation, which can solve the problems of slow coating deposition rate, low target utilization efficiency and small coating thickness, etc. Achieve the effect of reducing oxygen transmission rate, avoiding low target utilization efficiency, and overcoming line-of-sight effects

Active Publication Date: 2017-06-16
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, Hf (2231°C) and Ta (3020°C) have very high melting points and are generally prepared by physical vapor deposition (PVD) or laser cladding. The thickness of the layer is small, and more importantly, the PVD method and the laser cladding method have a "line of sight effect", which makes it difficult to prepare a complete and uniform coating on the surface of special-shaped parts, especially the inner surface of the hot-end part. Become the key to restrict the application of modified Hf-Ta metal coating on tantalum alloy hot end parts

Method used

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  • A kind of tantalum alloy surface modified composite HF-TA coating and preparation method thereof
  • A kind of tantalum alloy surface modified composite HF-TA coating and preparation method thereof
  • A kind of tantalum alloy surface modified composite HF-TA coating and preparation method thereof

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Embodiment 1

[0032] The tantalum alloy surface modification composite Hf-Ta coating in this embodiment is characterized in that it consists of the following components in mass percentage: Ta 20%, Si 1.2%, B 0.6%, Al 2.0%, Cr 1.8%, and the balance is Hf.

[0033] The method for preparing the modified composite Hf-Ta coating on the surface of the tantalum alloy of this embodiment comprises the following steps:

[0034] Step 1. Use 600 # SiC sandpaper pickles the surface of the tantalum alloy after grinding, and then performs sandblasting and degreasing on the surface of the tantalum alloy after pickling; the acid solution used in the pickling is composed of hydrofluoric acid and concentrated nitric acid in a volume ratio of 7: 3 mixed, the mass concentration of the hydrofluoric acid is preferably 40%, the mass concentration of the concentrated nitric acid is preferably 65%; the tantalum alloy is a Ta10W alloy; the sand grains used in the sandblasting treatment are corundum sand, The pressu...

Embodiment 2

[0039] The tantalum alloy surface modification composite Hf-Ta coating in this embodiment is characterized in that it consists of the following components in mass percentage: Ta 19.5%, Si 1.0%, B 1.0%, Al 2.0%, Cr 2.0%, and the balance is Hf.

[0040] The method for preparing the modified composite Hf-Ta coating on the surface of the tantalum alloy of this embodiment comprises the following steps:

[0041] Step 1. Use 600 # SiC sandpaper pickles the surface of the tantalum alloy after grinding, and then performs sandblasting and degreasing on the surface of the tantalum alloy after pickling; the acid solution used in the pickling is composed of hydrofluoric acid and concentrated nitric acid in a volume ratio of 3: 2 mixed, the mass concentration of the hydrofluoric acid is preferably 60%, the mass concentration of the concentrated nitric acid is preferably 68%; the tantalum alloy is a Ta10W alloy; the sand grains used in the sandblasting treatment are zirconia sand , the pre...

Embodiment 3

[0046] The tantalum alloy surface modification composite Hf-Ta coating in this embodiment is characterized in that it consists of the following components in mass percentage: Ta 20.5%, Si 1.5%, B 0.5%, Al 2.5%, Cr 1.5%, and the balance is Hf.

[0047] The method for preparing the modified composite Hf-Ta coating on the surface of the tantalum alloy of this embodiment comprises the following steps:

[0048] Step 1. Use 600 # SiC sandpaper pickles the surface of the tantalum alloy after grinding it, and then performs sandblasting and degreasing on the surface of the tantalum alloy after pickling; 1 mixed, the mass concentration of the hydrofluoric acid is preferably 50%, the mass concentration of the concentrated nitric acid is preferably 66%; the tantalum alloy is a Ta10W alloy; the sand grains used in the sandblasting treatment are zirconia sand , the pressure of the blasting treatment is 0.2MPa; preferably, the tantalum alloy is immersed in acetone for degreasing treatment;...

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Abstract

The invention discloses a tantalum alloy surface modified composite Hf-Ta coating layer. The tantalum alloy surface modified composite Hf-Ta coating layer consists of the following components in percentage by mass: 19.5-24.5% of Ta, 0.5-2.5% of Si, 0.5-1.2% of B, 0.5-2.5% of Al, 0.5-2.0% of Cr, and the balance being Hf. In addition, the invention further discloses a method for preparing the modified composite Hf-Ta coating layer; and the method comprises the following steps: (1) a tantalum alloy is washed by acid after being polished, and then is subjected to the sand blasting treatment and the degreasing treatment; (2) modified composite Hf-Ta slurry is prepared; and (3) the slurry is pre-positioned on the surface of the tantalum alloy to obtain a pre-positioned layer; and then, the high-temperature fusion sinteringis performed to prepare the modified composite Hf-Ta coating layer. The modified composite Hf-Ta coating layer can prominently improve the oxidation resistance of the tantalum alloy in environments of ultrahigh temperature and low oxygen pressure, and can provide short-time protection for the tantalum alloy in an ultrahigh-temperature oxidation environment and an ablation environment.

Description

technical field [0001] The invention belongs to the technical field of ultra-high temperature protection, and in particular relates to a tantalum alloy surface modified composite Hf-Ta coating and a preparation method thereof. Background technique [0002] With the development of the aerospace industry, a new generation of high specific impulse, attitude control and orbit control rocket engines and hypersonic vehicles have put forward more stringent service requirements for refractory metals and their high-temperature protective coatings. Tantalum alloys have been widely used in the aerospace industry, aviation industry, and atomic energy industry due to their excellent high-temperature strength, toughness, and good processing properties, and are expected to be used as materials for ultra-high temperature hot-end components. However, the application of tantalum alloys in ultra-high temperature oxidation environments has oxidation resistance problems. Because of their high ox...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C27/00C23C24/10B22F7/02
CPCB22F7/02C22C27/00C23C24/103
Inventor 汪欣李争显杜继红唐勇杨涛严鹏李晴宇叶源盛
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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