CeO2-diffused superfine crystalline delta-Ni2Al3 coating, and preparation method and application thereof
A technology of ultra-fine grain and coating, which is applied in the direction of coating, combustion method, solid-state diffusion coating, etc., can solve the problems of low bonding strength and application limitations of aluminized coating, and avoid the reduction of high-temperature strength and creep performance , low cost, and the effect of expanding the range of metal materials
Inactive Publication Date: 2011-03-23
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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[0003] The object of the present invention is to provide a kind of CeO 2 Dispersed ultrafine grain δ-Ni 2 al 3 The coating and its preparation method and application solve the problems of low bonding strength and limited application of aluminized coating in the prior art
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[0029] Provide an embodiment of the present invention below, deposit on metal Ni and first deposit the Ni-CeO of one deck nanocrystalline structure 2 Composite film, then aluminized at 600 °C to prepare CeO 2 Dispersed ultrafine grain δ-Ni 2 Al 3 coating. And under the same aluminizing conditions without CeO 2 Nanocrystalline Ni coatings and δ-Ni prepared on coarse-grained (grain size ~ 20 μm) Ni 2 Al 3 Compared with the coating, the cyclic oxidation resistance of the coating at 1000 °C was studied.
[0030] Describe the present invention in detail below in conjunction with embodiment, general flow process is as follows:
[0031] 1) Take an electrolytic Ni plate as the base material, process it into a sample with a size of 15×10×2mm, grind it with water to 800# sandpaper, clean it ultrasonically in acetone, boil it in boiling water for 20 minutes, and then dry it for later use.
[0032] 2) Choose nano-sized CeO 2 powder with an average size of 7nm. The powder is first...
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Abstract
The invention discloses a CeO2-diffused superfine crystalline delta-Ni2Al3 coating, and a preparation method and application thereof, which solve the problems of high temperature, weak Al2O3 layer bonding strength for the thermal growth of an alumetized coating, limitations to application, and the like of conventional alumetizing technology. The coating is prepared by the following two steps of: preparing an Ni-CeO2 nanometer compound precursor film with a nanocrystalline structure on a metal substrate, such as a low-carbon steel substrate, a low alloy steel substrate, an Ni-based alloy substrate or the like, by performing coelectrodeposition on Ni and CeO2 nanoparticles; and performing diffusion alumetizing on the precursor film at 500 to 700 DEG C to obtain the superfine crystalline CeO2 modified delta-Ni2Al3 coating. The coating consists of the following components in percentage by mass: 1 to 10 percent of diffused CeO2 nanoparticles and the balance of delta-Ni2Al3 phase. The CeO2-diffused superfine crystalline delta-Ni2Al3 coating of the invention can be applied to the metal substrate, such as the low-carbon steel substrate, the low alloy steel substrate, the Ni-based alloy substrate or the like, in an oxidizing atmosphere at the working condition temperature of less than 1,000 DEG C as a protective coating of a related part in a boiler, a heat exchanger, a gasifier or a garbage incinerator of a thermal power plant.
Description
technical field [0001] The present invention relates to coating preparation technology, specifically a kind of CeO 2 Dispersed ultrafine grain δ-Ni 2 Al 3 Coatings and their methods of preparation and applications. Background technique [0002] Aluminized coatings are the first generation of high-temperature protective coatings, and the preparation temperature is generally above 900 ° C. The obtained coatings are generally composed of FeAl (on Fe-based metals) or NiAl (on Ni-based metals) phases. The application of this type of aluminized coating is limited to some extent. One: the coating preparation temperature is higher than the heat treatment temperature of low-carbon steel and low-alloy steel (high temperature will reduce the creep performance of steel due to the precipitation of carbides and the growth of grains), so that the coating can be used on the above materials Application is limited. Second: In the high-temperature oxidizing environment, the thermally grow...
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IPC IPC(8): C23F17/00C25D15/00C23C10/48F23G5/48F28F19/02C10J3/72
CPCY02E20/18
Inventor 彭晓徐承伟王福会
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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