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Boride modified glass ceramic based composite high-temperature oxidation resisting coating and preparation method thereof

A high-temperature oxidation-resistant, glass-ceramic technology, which is applied in the field of high-temperature refractory metal protection, can solve the problems of high preparation temperature and insufficient thermal erosion resistance of silicate glass-ceramic coatings, and achieves simple preparation process and improved thermal shock resistance. performance, the effect of good thermal washout performance

Active Publication Date: 2017-04-26
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The composite high-temperature anti-oxidation coating avoids the problem of high preparation temperature of boride ceramic coatings and is difficult to apply to refractory metal substrates, and solves the problem of insufficient thermal erosion resistance of silicate glass ceramic coatings under ultra-high temperature conditions , when protecting refractory metals, the composite high-temperature anti-oxidation coating can continuously protect the refractory metal substrate for more than 5 hours when the protection temperature does not exceed 1600°C

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  • Boride modified glass ceramic based composite high-temperature oxidation resisting coating and preparation method thereof
  • Boride modified glass ceramic based composite high-temperature oxidation resisting coating and preparation method thereof
  • Boride modified glass ceramic based composite high-temperature oxidation resisting coating and preparation method thereof

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Embodiment 1

[0034] The boride-modified glass-ceramic-based composite high-temperature anti-oxidation coating of this embodiment is composed of ZrB with a mass percentage of 50%. 2 and silicate glass with a mass percentage of 50%; the silicate glass is composed of the following raw materials in mass percentage: B 2 o 3 11.5%, Al 2 o 3 8.5%, ZrO 2 6.5%, CaO 4%, KNO 3 5%, NaOH 7.5%, the balance is SiO 2 ; The composite high-temperature oxidation-resistant coating is coated on the surface of the C103 niobium alloy.

[0035] The method for preparing a boride-modified glass-ceramic matrix composite high-temperature oxidation-resistant coating in this embodiment includes the following steps:

[0036] Step 1, pickling after polishing the surface of C103 niobium alloy, then degreasing the metal surface after pickling; the acid solution used in the pickling is mixed by hydrofluoric acid solution and concentrated nitric acid solution in a volume ratio of 7:3.5 Formed, the mass concentratio...

Embodiment 2

[0042] The boride-modified glass-ceramic-based composite high-temperature anti-oxidation coating of this embodiment is composed of ZrB with a mass percentage of 40%. 2 and silicate glass with a mass percentage of 60%; the silicate glass is composed of the following raw materials in mass percentage: B 2 o 3 3%, Al 2 o 3 2%, ZrO 2 3%, SrO 2 5%, ZnO 20%, the balance is SiO 2 ; The composite high-temperature anti-oxidation coating is coated on the surface of Nb521 niobium alloy.

[0043] The method for preparing a boride-modified glass-ceramic matrix composite high-temperature oxidation-resistant coating in this embodiment includes the following steps:

[0044] Step 1, pickling after polishing the surface of Nb521 niobium alloy, then degreasing the metal surface after pickling; the acid solution used in the pickling is mixed by hydrofluoric acid solution and concentrated nitric acid solution in a volume ratio of 6:3 Formed, the mass concentration of the hydrofluoric aci...

Embodiment 3

[0050] The boride-modified glass-ceramic-based composite high-temperature anti-oxidation coating of this embodiment is composed of TiB with a mass percentage content of 30%. 2 and silicate glass with a mass percentage of 60%; the silicate glass is composed of the following raw materials in mass percentage: B 2 o 3 20%, Al 2 o 3 15%, ZrO 2 10%, CaO 2 3%, KNO 3 5%, the balance is SiO 2 ; The composite high-temperature anti-oxidation coating is coated on the surface of Nb521 niobium alloy.

[0051] The method for preparing a boride-modified glass-ceramic matrix composite high-temperature oxidation-resistant coating in this embodiment includes the following steps:

[0052] Step 1, pickling after grinding the surface of Nb521 niobium alloy, and then degreasing the metal surface after pickling; the acid solution used in the pickling is mixed by hydrofluoric acid solution and concentrated nitric acid solution in a volume ratio of 6:4 Formed, the mass concentration of the...

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Abstract

The invention discloses a boride modified glass ceramic based composite high-temperature oxidation resisting coating. The composite high-temperature oxidation resisting coating fired on the surface of a refractory metal matrix is prepared from boride and silicate glass, wherein the boride is at least one or two of HfB2, ZrB2 and TiB2; besides, the invention further discloses a preparation method of the coating. The method comprises steps as follows: 1, the surface of the refractory metal matrix is treated; 2, boride particle modified glass ceramic composite slurry is prepared; 3, a preset layer is obtained by presetting the slurry on the surface of the refractory metal matrix, and the boride modified glass ceramic based composite high-temperature oxidation resisting coating is obtained vacuum high-temperature firing. The composite high-temperature oxidation resisting coating is used for high-temperature protection of the refractory metal matrix and can continuously protect the refractory metal matrix at the protection temperature of 400-1,600 DEG C for 5 h or longer.

Description

technical field [0001] The invention belongs to the technical field of high-temperature refractory metal protection, and in particular relates to a boride-modified glass ceramic matrix composite high-temperature anti-oxidation coating for protection of refractory metals 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 metals in high-temperature oxidizing environments has oxidation resistance problems, and its high-temperature oxidation resistance ability is difficult to improve through alloying. Therefore, the development of high-performance high-temperature oxidation-resistant coatings has become the key to the high-temperature application of refractory metal substrates and their alloys. [0003] At present, for refract...

Claims

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Application Information

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IPC IPC(8): C03C8/20C23D11/00
CPCC03C8/20C23D11/00
Inventor 汪欣李争显杜继红严鹏杨涛李晴宇彭易发
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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