Metal carbide coating covered carbon-based material and preparation method therefor

A metal carbide and carbon-based material technology, which is applied in the field of carbon-based materials covered with metal carbide coating and its preparation, can solve the problem of low bonding strength between coating and substrate, corrosion of reaction products to equipment, and uniform coating. It is easy to operate, the thickness is uniform and controllable, and the performance is improved.

Inactive Publication Date: 2016-03-30
SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem solved by the present invention is to overcome the high cost and complex process of preparing coating on the carbon-based material, the reaction product seriously corrodes the equipment, and the uniformity of the coating is difficult to control, and the relationship between the coating and the substrate is difficult. Combining the defects of low strength and easy cracking of the coating, a carbon-based material coated with a metal carbide coating and a preparation method thereof are provided

Method used

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  • Metal carbide coating covered carbon-based material and preparation method therefor
  • Metal carbide coating covered carbon-based material and preparation method therefor
  • Metal carbide coating covered carbon-based material and preparation method therefor

Examples

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Embodiment 1

[0039] A kind of graphite preparation method covered with chromium carbide coating, it adopts attached figure 1 The experimental device shown is prepared, wherein, 1 is the inner crucible; 2 is the outer crucible; 3 is molten salt; 4 is carbon-based sample; 5 is metal; 6 is inert atmosphere or vacuum; 7 is sample fixing Corrosion-resistant alloy wire is used; 8 is the sample holder. Concrete preparation method comprises the following steps:

[0040] (1) Polish the graphite surface with sandpaper until the surface is smooth. The polished graphite was cleaned with absolute ethanol, and then kept at a constant temperature in a vacuum oven at 120°C for more than 12 hours.

[0041] (2) The surface of the metal chromium sample was polished with sandpaper to remove the surface oxide film, cleaned with absolute ethanol, and dried with a hair dryer.

[0042] (3) Put graphite and metal chromium in the inner crucible at the same time, add LiF-NaF-KF (molar ratio is 46.5:11.5:42) solid...

Embodiment 2

[0046] A method for preparing a carbon-carbon composite material covered with a chromium carbide coating, the experimental device used in the preparation is the same as that in Example 1. Concrete preparation method comprises the following steps:

[0047] (1) The carbon-carbon composite material is cleaned with absolute ethanol, and then kept at a constant temperature in a vacuum oven at 120° C. for more than 12 hours.

[0048] (2) Polish the surface of the metal chromium sample with sandpaper to remove the surface oxide film, clean it with absolute ethanol, and dry it with a hair dryer.

[0049] (3) The carbon-carbon composite material and metal chromium are placed in the inner crucible at the same time, and LiF-NaF-KF (molar ratio is 46.5:11.5:42) solid salt is added to the crucible, wherein the solid salt is added in an amount such that After the solid salt is molten, the carbon-carbon composite material and metal chromium can be completely submerged. The ratio of the surf...

Embodiment 3

[0053] A kind of graphite preparation method that is covered with titanium carbide coating, the experimental device that its preparation adopts is the same as embodiment 1. Concrete preparation method comprises the following steps:

[0054] (1) Polish the graphite surface with sandpaper until the surface is smooth. The polished graphite was cleaned with absolute ethanol, and then kept at a constant temperature in a vacuum oven at 120°C for more than 12 hours.

[0055] (2) The surface of the metal titanium sample was polished with sandpaper to remove the surface oxide film, cleaned with absolute ethanol, and dried with a hair dryer.

[0056] (3) Put graphite and metal titanium in the inner crucible at the same time, add KCl-MgCl to the crucible 2

[0057] (The molar ratio is 68:32) solid salt, wherein, the amount of solid salt added so that graphite and metal titanium can be fully submerged after the solid salt is melted is as the criterion, and the ratio of the surface area...

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Abstract

The present invention discloses a metal carbide coating covered carbon-based material and a preparation method therefor. The preparation method comprises the following steps: putting the carbon-based material and metallic chromium and/or titanium into chloride and/or fluoride molten salt, carrying out a reaction under anhydrous oxygen-free conditions for 1-100 hours, and obtaining metal carbide coating covered carbon-based material. The metal carbide is chromium carbide and/or titanium carbide. According to the preparation method disclosed by the present invention, molten salt is used as a reaction medium, a metal carbide coating is prepared on the surface of the carbon-base in situ, the method is simple in a process and easy to operate, and has no requirement of a sample shape, and industrial production is facilitated; and the prepared metal carbide coating is uniform in thickness, and combined tightly with a substrate, so that surface hardness, abrasion resistance and high-temperature oxidation resistance of the carbon-based material can be significantly improved, use performance of the carbon-based material is greatly improved, and a practical application scope of the carbon-based material is expanded.

Description

technical field [0001] The invention relates to the field of material surface treatment, in particular to a carbon-based material covered with a metal carbide coating and a preparation method thereof. Background technique [0002] Carbon-based materials such as graphite and carbon-carbon composites have good thermal stability, corrosion resistance, electrical and thermal conductivity, and a series of excellent high-temperature properties (such as high specific modulus, thermal shock resistance, and good high-temperature strength retention, etc. ), widely used in metallurgy, aviation, aerospace and civil industry. However, carbon-based materials have certain disadvantages such as low hardness and poor surface wear resistance, especially in an oxidizing atmosphere that exceeds a certain temperature range and will be significantly oxidized, which greatly limits its practical application. [0003] At present, there are two main ways to improve the high-temperature oxidation res...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/87
Inventor 俞国军孙华侯娟刘华剑谢雷东周兴泰侯惠奇
Owner SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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