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Preparation method of manganese-chromium ceramic coating on surface of alloy material

A technology of ceramic coating and alloy material, applied in metal material coating process, coating, solid diffusion coating and other directions, can solve the problems of poor Cr substrate, low bonding force between coating and substrate, easy to fall off and failure, etc. Improve service life, good stability, excellent anti-coking effect

Active Publication Date: 2016-10-12
EAST CHINA UNIV OF SCI & TECH
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Problems solved by technology

[0010] The ceramic protective layer prepared by the above method can protect the substrate to a certain extent, but it also has the following disadvantages: the original manganese content in the substrate is low, and the ceramic coating prepared directly by low oxygen partial pressure in-situ oxidation method is relatively thin (~1 micron), with the combined effects of high-speed erosion of materials in the furnace tube, cyclic coking, decoking, carbonization and other factors, the coating is prone to failure; at the same time, the Mn of the ceramic coating comes from the original base material of the substrate, and the migration of Mn will The substrate near the coating is poor in Cr and Mn, and once the protective layer is damaged, carburization and coking are more likely to accelerate
Using direct sintering to form a glass or ceramic coating process, the obtained coating has a relatively low bonding force with the substrate, and it is easy to fall off and fail

Method used

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  • Preparation method of manganese-chromium ceramic coating on surface of alloy material
  • Preparation method of manganese-chromium ceramic coating on surface of alloy material
  • Preparation method of manganese-chromium ceramic coating on surface of alloy material

Examples

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Embodiment 1

[0043] Example Preparation of ceramic coating on the surface of ZG45Cr35Ni25NbM alloy material.

[0044] The ZG45Cr35Ni25NbM alloy material is treated with alkali and pickling, and after the surface is degreased and derusted, it is put into the manganese infiltration tank together with the manganese infiltration tank, and the manganese infiltration tank is sealed with refractory mud, and then the infiltration tank is put into the muffle furnace Carry out high temperature manganese infiltration treatment. The heat treatment temperature is 950°C, the heating rate is 10°C / min, and the holding time is 6h. When the temperature of the infiltration tank drops to room temperature, take out the alloy material, remove the manganizing agent attached to the surface, put it into the chromizing tank together with the chromizing agent, seal the chromizing tank with refractory mud, and then put the infiltration tank into the muffle furnace high temperature chromizing treatment. The heat tre...

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Abstract

The invention relates to a preparation method of a manganese-chromium ceramic coating on the surface of an alloy material. The preparation method comprises the steps that firstly, Mn and Cr are made to permeate into an alloy surface layer through a two-step pack cementation technique, and the Mn and Cr are made to distributed according to a specific concentration gradient; and secondly, the surface of the alloy material is oxidized through a low-oxygen partial pressure method, so that the compact manganese-chromium ceramic coating is formed. By the adoption of the preparation method, the coating can have a large thickness, the high-temperature oxidation resistance, high-temperature carburization resistance and high-temperature coking resistance of the alloy material are effectively improved, and the service life is long.

Description

technical field [0001] The invention relates to the technical field of ceramic coatings, in particular to a method for preparing a manganese-chromium ceramic coating on the surface of an alloy material. Background technique [0002] Traditional high-temperature alloys use alloying elements such as chromium and nickel to improve the high-temperature oxidation resistance and carburization resistance of the material. At high temperature, various oxides such as Cr are formed on the surface of alloying elements 2 o 3 , NiO, etc. can protect the base material from high temperature corrosion to a certain extent. But at higher temperature, Cr on the surface of the alloy material 2 o 3 The oxide layer has a high vapor pressure and is still easy to volatilize and peel off, thus losing its protective effect on the base material. [0003] High-temperature alloys such as HP40, HK40, 35Cr45Ni, and Incoloy 800 are commonly used furnace tube materials for ethylene cracking furnaces and...

Claims

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Application Information

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IPC IPC(8): C23C10/58C23C10/02C23C8/18C23C8/16C23C12/00C22C38/58C22C38/04C22C38/34C22C38/02C22C38/48C22C38/50C22C38/44C22C38/06C22C19/05C22C30/00
CPCC22C19/053C22C19/058C22C30/00C22C38/02C22C38/04C22C38/06C22C38/34C22C38/44C22C38/48C22C38/50C22C38/58C23C8/16C23C8/18C23C10/02C23C10/58C23C12/00
Inventor 徐宏鲍彬彬刘京雷张伟锋张凯刘波
Owner EAST CHINA UNIV OF SCI & TECH
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