Preparation method of composite alloy coating on tantalum-tungsten alloy

A technology of composite alloy and tantalum-tungsten alloy, which is applied in the field of preparation of composite alloy coating on tantalum-tungsten alloy, can solve the problems of complex preparation methods, low general performance, and inability to meet the temperature resistance requirements of new engines, and achieve good oxidation resistance Performance, the effect of excellent oxidation resistance

Active Publication Date: 2015-08-12
AEROSPACE RES INST OF MATERIAL & PROCESSING TECH +1
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  • Application Information

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Problems solved by technology

[0005] The above-mentioned research on tantalum-tungsten alloy anti-oxidation coatings carried out in China generally has low performance (1800°C life is l

Method used

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  • Preparation method of composite alloy coating on tantalum-tungsten alloy

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preparation example Construction

[0026] The preparation method of the composite alloy coating on the tantalum-tungsten alloy of the present invention specifically comprises the following steps:

[0027] Step (1), MoSi 2 Coating Slurry Preparation

[0028] MoSi with a mass percentage content of 65% to 75% 2 Powder and HfB with a mass percentage content of 25% to 35% 2 Powder mixing, dry mixing in a ball mill for more than 4 hours, and then adding binder and diluent to make MoSi 2 Coating slurry, the slurry is wet mixed in a ball mill for more than 1 hour; the binder is ethyl acetate, and the diluent is nitro varnish.

[0029] Step (2), MoSi 2 Coating high temperature sintering

[0030] MoSi obtained by step (1) 2 The coating slurry is sprayed to the surface of the product to be sprayed with a siphon spray gun, with a thickness of 150 μm to 250 μm. The sprayed coating should be uniform and dense without missing coating. Put the sprayed product to be sprayed into a high-temperature vacuum furnace for sint...

Embodiment 1

[0037] Take the preparation of Hf-Ta composite alloy coating on Ф4.5×70mm test bar as an example

[0038] (1) MoSi 2 Coating Slurry Preparation

[0039] The particle size of the selected powder is less than 50 μm, and the purity is greater than 99.9%.

[0040] First, MoSi with a mass percentage content of 65% 2 Powder, 35% HfB 2 The powders were mixed and put into a ball mill for dry mixing for 6 hours. Add ethyl acetate and nitro varnish to make a slurry with a suitable concentration, and wet mix the slurry in a ball mill for 1.5 hours for later use.

[0041] (2)MoSi 2 Coating high temperature sintering

[0042] Spray the mixed slurry onto the surface of the sample with a siphon spray gun, with a thickness of 150 μm to 200 μm. The sprayed coating should be uniform and dense without leakage.

[0043] Put the sprayed sample into a high-temperature vacuum furnace for sintering, the sintering temperature is 1850°C, and keep warm for 18 minutes. During sintering, the vacuum...

Embodiment 2

[0055] Take the preparation of Hf-Ta composite alloy coating on Ф4.5×70mm test bar as an example

[0056] (1) MoSi 2 Coating Slurry Preparation

[0057] The particle size of the selected powder is less than 50 μm, and the purity is greater than 99.9%.

[0058] First, MoSi with a mass percentage content of 75% 2 Powder, 25% HfB 2 The powders were mixed and put into a ball mill for dry mixing for 6 hours. Add ethyl acetate and nitro varnish to make a slurry with a suitable concentration, and wet mix the slurry in a ball mill for 1.5 hours for later use.

[0059] (2)MoSi 2 Coating high temperature sintering

[0060] Spray the mixed slurry onto the surface of the sample with a siphon spray gun, with a thickness of 200 μm to 250 μm. The sprayed coating should be uniform and dense without leakage.

[0061] The sprayed samples were put into a high-temperature vacuum furnace for sintering at a sintering temperature of 1900°C and kept for 18 minutes. During sintering, the vacu...

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Abstract

The invention relates to a preparation method of a composite alloy coating on a tantalum-tungsten alloy. The preparation method comprises the following steps of 1, MoSi2 coating slurry preparation, 2, MoSi2 coating high-temperature sintering, 3, Hf-Ta alloy coating slurry preparation, and 4, Hf-Ta alloy composite coating sintering. According to the preparation method, the product surface is spray-coated with the prepared MoSi2 coating as a transition layer, and the surface of the transition layer is spray-coated with an Hf-Ta alloy coating. The preparation method solves the problem of Hf-Ta alloy coating and base material bonding and tantalum-tungsten alloy high-temperature oxidation. The prepared composite alloy coating is uniform and compact, has no defects such as holes and cracks and has good oxidation resistance.

Description

technical field [0001] The invention relates to the field of high-temperature oxidation-resistant coatings, in particular to a method for preparing a composite alloy coating on a tantalum-tungsten alloy. Background technique [0002] Foreign countries have gradually developed a variety of orbit control / attitude control engine materials and high-temperature anti-oxidation coatings since the 1950s. The base materials are mainly focused on refractory metals (W, Mo, Ta, Nb, Re, etc.), and the coatings are mainly Focus on alloy coating, oxide coating, silicide coating, aluminide coating and precious metal coating, such as niobium hafnium alloy / silicon chromium titanium coating in the United States, niobium tungsten alloy / molybdenum silicide coating in Russia, Europe Platinum-rhodium alloy thrust chambers and rhenium-iridium thrust chambers in the United States have model application reports. [0003] At present, although significant progress has been made in the research and dev...

Claims

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Application Information

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IPC IPC(8): C23C24/08
Inventor 何开民张绪虎徐方涛贾中华李海庆陈道勇
Owner AEROSPACE RES INST OF MATERIAL & PROCESSING TECH
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