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Al2O3-SiO2 high-temperature insulating coating on surface of metal tungsten and preparation method thereof

An al2o3-sio2, high temperature insulation technology, applied in metal material coating process, coating, solid diffusion coating and other directions, to achieve the effect of excellent performance, good electrical insulation performance and simplified process

Active Publication Date: 2016-02-03
XIAMEN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the preparation of Al on the surface of metal tungsten 2 o 3 -SiO 2 There is no relevant report on high temperature insulating coating

Method used

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  • Al2O3-SiO2 high-temperature insulating coating on surface of metal tungsten and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Preparation process see figure 1 .

[0023] (1) Pretreatment of tungsten base material: Polish the metal tungsten base material with sandpaper until the surface is smooth and flat, and put it into absolute ethanol or ethanol solution for oil degreasing treatment, then dry and set aside.

[0024] (2) Aluminization treatment: put the pretreated metal tungsten into an alumina crucible with a uniformly mixed aluminizing agent, which contains elemental aluminum powder, NaF, Al 2 o3 The mass ratio of the three is 15:5:80, and then placed in the furnace to heat, and pass inert gas or hydrogen as a protective atmosphere, raise the temperature to 1000°C at a rate of 10°C / min and keep it at 1000°C for 20 hours. After the furnace cools down, take it out, boil it in distilled water for 5-10 minutes, rinse it with deionized water, wipe and dry it with ethanol, and obtain a semi-finished product A with a W-Al coating on the metal tungsten surface.

[0025] (3) Siliconization treatm...

Embodiment 2

[0028] Preparation process see figure 1 .

[0029] (1) Pretreatment of tungsten base material: Polish the metal tungsten base material with sandpaper until the surface is smooth and flat, and put it in absolute ethanol or ethanol solution for oil degreasing treatment, then dry it and set it aside.

[0030] (2) Aluminization treatment: put the pretreated metal tungsten into an alumina crucible with a uniformly mixed aluminizing agent, which contains elemental aluminum powder, NaF, Al 2 o 3 The mass ratio of the three is 20:10:70, and then placed in the furnace to heat, and pass inert gas or hydrogen as a protective atmosphere, the temperature rises to 1100°C at a rate of 30°C / min and is kept at 1100°C for 15 hours. After the furnace cools down, take it out, boil it in distilled water for 5-10 minutes, rinse it with deionized water, wipe and dry it with ethanol, and obtain a semi-finished product A with a W-Al coating on the metal tungsten surface.

[0031] (3) Siliconization...

Embodiment 3

[0034] Preparation process see figure 1 .

[0035] (1) Pretreatment of tungsten base material: Polish the metal tungsten base material with sandpaper until the surface is smooth and flat, and put it into absolute ethanol or ethanol solution for oil degreasing treatment, then dry and set aside.

[0036] (2) Aluminization treatment: put the pretreated metal tungsten into an alumina crucible with a uniformly mixed aluminizing agent, which contains elemental aluminum powder, NaF, Al 2 o 3 The mass ratio of the three is 25:15:60, then put it in the furnace to heat, and pass inert gas or hydrogen as a protective atmosphere, raise the temperature to 1200°C at a rate of 20°C / min and keep it at 1200°C for 10 hours. Take it out after cooling down in the furnace, boil it in distilled water for 5-10 minutes, rinse it with deionized water, wipe it with ethanol and dry it to obtain a semi-finished product A with a W-Al coating on the metal tungsten surface.

[0037] (3) Siliconization tr...

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Abstract

The invention discloses an Al2O3-SiO2 high-temperature insulating coating on the surface of metal tungsten and a preparation method thereof. According to the method, first in the atmosphere of inert gas or hydrogen, a W-Al layer is prepared on the surface of tungsten by utilizing an embedding aluminizing method; under the protection of inert gas or hydrogen, a W-Al-Si layer is prepared on the surface of tungsten through an embedding silicification method; and finally the W-Al-Si layer is oxidized, so that an Al2O3-SiO2 insulating layer is formed on the surface of the tungsten material. The Al2O3-SiO2 high-temperature insulating coating material is prepared on the surface of the metal tungsten through a two-step embedding method and an oxidation method, the process is simple, the production cost is low, and the Al2O3-SiO2 high-temperature insulating coating has good electrical insulation property and can serve as an insulating coating of a tungsten cladding material in a fusion reactor.

Description

technical field [0001] The invention relates to a novel high-temperature insulating coating material and its preparation technology, in particular to a new two-step embedding method + oxidation method to prepare Al on the surface of metal tungsten. 2 o 3 -SiO 2 High temperature insulating coating and its preparation method. Background technique [0002] Liquid lithium-lead cladding is one of the fusion reactor cladding concept designs that have attracted international attention and has the most development potential, and the cladding material is one of the core issues of liquid lithium-lead cladding. Metal tungsten (W) is selected as a fusion reactor because of its high energy critical value of physical sputtering, no hydride formation with hydrogen, extremely high melting point, extremely low vapor pressure, good thermal conductivity, and high temperature strength. cladding material. However, the liquid lithium-lead alloy flowing in the cladding will produce magnetohydr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C10/58C23C10/60
CPCC23C10/58C23C10/60
Inventor 廉冀琼张厚安吴艺辉古思勇
Owner XIAMEN UNIV OF TECH
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