Chrome-siliconizing infiltrating agent on surface of alloy and preparation method of coating

Abstract

The invention relates to a chrome-siliconizing infiltrating agent on the surface of an alloy and a preparation method of a coating. The infiltrating agent comprises the following powdery components in weight percentage: 12-25% of chrome, 5%-20% of ferrosilicon alloy, 1%-5% of titanium, 0.5%-3.5% of activating agent, 5%-10% of alkaline earth metal oxide and the balance of aluminum oxide. The preparation method comprises the following steps: firstly weighing the powdery components according to the proportion, uniformly stirring and mixing, and then placing into an infiltrating box; burying a workpiece to be infiltrated after deoiling and dedusting into the infiltrating agent, compacting, sealing the infiltrating box with refractory mortar, and drying at the temperature of 100 DEG C-120 DEG C for 1-2h; and placing the infiltrating box into a muffle furnace, heating to 800 DEG C-1250 DEG C, and performing heat preservation for 5-10h to obtain the dense and non-porous chrome-silicon coating on the surface of the alloy. The coating obtained according to the invention has a uniform, dense and non-porous structure, as well as excellent high temperature resistance, oxidation resistance, carburizing resistance, inhibition of a catalytic effect of iron-nickel elements and other performances.

Description

【Technical field】 [0001] 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. 【Background technique】 [0002] 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, chromizing is easi...

AI Technical Summary

Problems solved by technology

[0003] 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

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