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Chromium-silicon co-infiltration agent on alloy surface and preparation method of coating

A chrome-silicon infiltration and alloy technology is applied in the field of alloy surface coating preparation. effect of effect

Active Publication Date: 2017-01-04
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, in the process of element diffusion, due to the different diffusion speeds of Cr, Si, and Fe, the diffusion coefficient of Si is larger than that of Fe, and there is the Kirkendall effect of atomic diffusion.
The diffusion of Cr and Si is accompanied by the appearance of voids, resulting in a large number of pores in the coating, the coating is not dense, the brittleness increases, and even the coating will fall off, seriously affecting the performance

Method used

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  • Chromium-silicon co-infiltration agent on alloy surface and preparation method of coating

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Embodiment 1

[0039] A kind of alloy surface chromium-silicon infiltrating agent in the present embodiment, comprises the component powder of following percentage by weight: Chromium: 20%, ferrosilicon alloy: 15%; Titanium: 3%; Activator: 2% (ammonium chloride 0.5%, sodium fluoride 1.5%); calcium oxide: 5%; magnesium oxide: 5%; aluminum oxide: the balance. The particle size of the above-mentioned component powders is 150-250 mesh.

[0040] The workpiece material is Cr25Ni35Nb alloy, and the coating preparation process is as follows:

[0041] Step (1): calcining the alumina powder at a temperature of 1100° C. for 2 hours. Weigh each component by weight percentage, stir and mix them evenly, and put them into the infiltration box.

[0042] Step (2): Grind the workpiece with silicon carbide sandpaper to 800#, wash with acetone and blow dry.

[0043] Step (3): Embed the workpiece in the infiltrant and compact it, the distance between the workpiece and the top and bottom is 30mm. Then seal th...

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Abstract

The invention relates to a chromium-silicon co-infiltration agent on the surface of an alloy and a coating preparation method. The infiltration agent includes the following component powders in weight percentages: chromium: 12-25%; ferrosilicon alloy: 5%-20%; titanium: 1% ~5%; activator: 0.5%~3.5%; alkaline earth metal oxide: 5%~10%; Infiltrate the infiltration box; bury the workpiece to be infiltrated after degreasing and derusting in the infiltration agent and compact it, seal the infiltration box with refractory mud, and dry it at 100°C-120°C for 1-2 hours; put the infiltration box into the muffle Heating in a furnace to 800°C to 1250°C for 5 to 10 hours to obtain a dense and non-porous chromium-silicon coating on the surface of the alloy. The coating structure obtained by the invention is uniform and dense, without pores, and has excellent properties such as high temperature resistance, oxidation resistance, carburization resistance, and inhibition of the catalytic effect of iron and nickel elements.

Description

[0001] 【Technical field】 [0002] The invention relates to an alloy surface coating preparation technology, in particular to a chromium-silicon infiltration agent on an alloy surface and a coating preparation method. [0003] 【Background technique】 [0004] As we all know, under normal service conditions, the failure of steel materials mostly originates from the surface. The surface coating strengthening technology can change the composition, organization and structure of the material surface and improve the surface performance, which can not only prolong the service life of the material, but also avoid the use of high-cost materials. Chromizing (Cr) and siliconizing (Si) on the metal surface can significantly improve the corrosion resistance, high temperature oxidation resistance, and carburization resistance of metal materials, and have the effect of inhibiting the catalytic effect of iron and nickel elements, and have been used to a certain extent. For low-carbon steel, chr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C10/54
Inventor 刘京雷屈笑雨徐宏黄志荣万顺陆阳
Owner EAST CHINA UNIV OF SCI & TECH
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