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Zr modified silicide coating on refractory metal surface and preparation method thereof

A refractory metal, silicide technology, applied in metal material coating process, coating, heating inorganic powder coating and other directions, can solve the problems of limiting the high temperature protection life of silicide coating, oxide film cracking or high temperature spheroidization, etc. , to achieve the effect of easy control, smooth surface and good compatibility

Active Publication Date: 2018-05-08
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, at high temperature, with SiO 2 The thickening of the glass film, the oxide film is prone to cracking or high-temperature spheroidization, which limits the high-temperature protection life of the silicide coating

Method used

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  • Zr modified silicide coating on refractory metal surface and preparation method thereof
  • Zr modified silicide coating on refractory metal surface and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0027] The Zr modified silicide coating prepared on the surface of the C103 alloy in this embodiment is composed of the following mass percentages: Ti 15%, W 15%, Cr 10%, Zr 5%, Nb 5%, and the balance is Si and not Avoid impurities.

[0028] The method for preparing Zr modified silicide coating on the surface of C103 alloy in this embodiment comprises the following steps:

[0029] Step 1. Use 600 # SiC sandpaper grinds the surface of C103 alloy, and then carries out sandblasting, degreasing and pickling treatment to the surface of C103 alloy successively; The time is 4min; preferably, the C103 alloy is immersed in acetone for degreasing treatment; the acid solution used in the pickling is formed by mixing hydrofluoric acid and concentrated nitric acid in a volume ratio of 7:3, and the mass concentration of the hydrofluoric acid 40%, the mass concentration of the concentrated nitric acid is 65%, and the pickling time is 3min;

[0030] Step 2. Mix titanium powder, tungsten po...

Embodiment 2

[0035] The Zr-modified silicide coating prepared on the surface of Ta10W alloy in this embodiment is composed of the following components by mass percentage: Ti 25%, W 20%, Cr 12.5%, Zr 3%, Nb 6.5%, and the balance is Si and not Avoid impurities.

[0036] The method for preparing a Zr modified silicide coating on the Ta10W alloy surface in this embodiment comprises the following steps:

[0037] Step 1. Use 600 # The surface of the Ta10W alloy is polished with SiC sandpaper, and then the surface of the Ta10W alloy is sandblasted, degreased and pickled in turn; The sand time is 4min; preferably, the Ta10W alloy is immersed in acetone for degreasing treatment; the acid solution used in the pickling is formed by mixing hydrofluoric acid and concentrated nitric acid in a volume ratio of 6:4, and the mass of the hydrofluoric acid Concentration is 60%, the mass concentration of described concentrated nitric acid is 68%, the time of pickling treatment is 1min;

[0038] Step 2. Mix ...

Embodiment 3

[0042] The Zr modified silicide coating prepared on the surface of the TZM molybdenum alloy in this embodiment is composed of the following mass percentages: Ti 12%, W 17%, Cr 15%, Zr 3%, Nb 8%, and the balance is Si and unavoidable impurities.

[0043] The method for preparing a Zr modified silicide coating on the surface of a TZM molybdenum alloy in this embodiment comprises the following steps:

[0044] Step 1. Use 600 # Grinding the surface of the TZM molybdenum alloy with SiC sandpaper, and then performing sandblasting, degreasing and pickling on the surface of the TZM molybdenum alloy in turn; the sand used in the sandblasting treatment is zirconia sand, and the pressure of the sandblasting treatment is 0.2MPa , the sandblasting time is 6min; preferably, the TZM molybdenum alloy is immersed in acetone for degreasing treatment; the acid solution used in the pickling is formed by mixing hydrofluoric acid and concentrated nitric acid in a volume ratio of 6.5:3.5, and the h...

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Abstract

The invention discloses a Zr modified silicide coating on a refractory metal surface. The Zr modified silicide coating comprises the following components of Ti, W, Cr, Zr, Nb and Si. The invention further discloses a preparation method of the coating. The preparation method comprises the following steps that 1, polishing, sand blasting, degreasing and acid washing are carried out on refractory metal; 2, composite suspension slurry is prepared; and 3, the slurry is placed on the refractory metal surface in advance to obtain a preset layer, then high-temperature fusion sintering is carried out to prepare the preparation method of the coating, the Zr modified silicide coating is good in compatibility with a refractory metal matrix, the coating is suitable for Nb, Nb alloy, W, W alloy, Ta, Taalloy, Mo or Mo alloy, the thickness of the coating is controllable, the coating is in metallurgical bonding with the matrix, coating can be realized on a surface of a special-shaped hot end part andan inner surface of the part, and the prepared coating can provide no less than 200h protection for the refractory metal material under the oxidation condition of 1100-1500 DEG C or provide short-timeprotection in 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 Zr-modified silicide coating on a refractory metal surface and a preparation method thereof. Background technique [0002] Refractory metals have excellent high-temperature strength and toughness and good processing properties, and have been widely used in the aerospace industry, aviation industry and atomic energy industry. However, the application of refractory alloys in ultra-high temperature oxidation environments has oxidation resistance problems. Because of their high oxygen affinity and high oxygen solubility, they are easy to absorb oxygen at room temperature and severely oxidized when they are far below the service temperature. Therefore, in order to ensure the high-temperature mechanical properties and working life of the refractory metal hot-end parts, it is necessary to apply an ultra-high temperature protective coating to them....

Claims

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Application Information

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IPC IPC(8): C23C24/08C22C29/18
CPCC22C29/18C23C24/085
Inventor 汪欣杜继红李争显杨涛严鹏李晴宇马秀芬张勇
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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