High temperature resistant molten salt corrosion ceramet anode material and preparation method thereof

Abstract

The present invention provides a kind of high temperature resistant molten salt corrosion ceramet anode material and a preparation method thereof. The referred ceramet inertness anode material is composed of the following components by weight: 50% to 95% of spinelle type oxide, 1% to 30% of other oxide, 1% to 30% of metal or alloy, and 0.1% to 2% of grain boundary corrosion resistant energizing agent. The raw material is added with a given amount of +3 value lanthanide series rare-earth oxide powder, the rare-earth oxide and a ceramic matrix react with each other during a sintering process toform high temperature resistant molten salt corrosive ferrate new phase along the grain boundary, and simultaneously accelerate the elimination of communication between the grain boundary and breathing holes as well as densification of the sintering material, so as to improve the high temperature resistant molten salt corrosive performance of the material especially the grain boundary region.

Description

Metal ceramic anode material resistant to high temperature molten salt corrosion and preparation method thereof Technical field The invention belongs to the field of material science and relates to a metal ceramic anode material resistant to high temperature molten salt corrosion and a preparation method thereof. Background technique At present, cermet has good thermochemical stability, strong corrosion resistance, oxidation resistance and excellent electrical conductivity and thermal shock resistance of metal materials, and is considered to be the most promising replacement for carbon anode as molten salt electrolysis ( Such as electrolytic aluminum) one of the inert anode materials. In the high-temperature molten salt electrolyte, due to the difference in chemical composition between the grain interface and the interior, as well as the presence of grain boundary impurities or internal stress, it is easy to cause problems such as electrolyte penetration, material swelling, cr...

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Problems solved by technology

The purpose of the present invention is to provide a kind of cermet inert anode material and its preparation method that can withstand the corrosion of long-term high-temperature fluoride molten salt, and can ensure the inert anode in aluminum electrolysis run smoothly, solve the problem of existing cermet for aluminum electrolysis Corrosion resistance of inert anode materials, especially the problem that the corrosion resistance of grain boundaries needs to be improved

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