A rare earth samarium zirconate nanomaterial and its hydrothermal preparation method

Abstract

The invention discloses rare earth samarium zirconate nano material and a hydrothermal preparation method of the rare earth samarium zirconate nano material. The rare earth samarium zirconate nano material adopts nanoscale rare earth samarium zirconate powder formed by directly performing hydro-thermal synthesis on coprecipitated precursors. The rare earth samarium zirconate powder prepared through the method has a low thermal coefficient and a good thermal barrier effect, and belongs to potential photocatalytic semiconductor material. The method comprises the following steps: firstly, dissolving a zirconium source in deionized water, and then mixing the zirconium source with samarium source solution, secondly, adding prepared strong alkali solution in the mixed solution of the step one, sufficiently stirring to obtain precursor products, and performing centrifugalization to obtain solid precipitate, thirdly, dispersing the solid precipitate of the step two in deionized water, adjusting the PH value of solution, and adding slurry in a high-pressure reaction kettle to be reacted; and fourthly, taking out powder after the reaction, and washing the powder obtain pour phase samarium zirconate nano powder.

Description

technical field [0001] The invention belongs to the chemical industry field, and the invention relates to a thermal barrier coating material, a photocatalytic material and preparation thereof, in particular to a rare earth samarium zirconate nano material and a water preparation method thereof. Background technique [0002] Rare earth samarium zirconate is a new type of inorganic composite material with catalytic, ion conductivity, dielectric properties and other physical and chemical properties. Due to its good high temperature stability, high chemical stability, high melting point, and high ionic conductivity, it is widely used in thermal barrier coatings, catalysts, hydrogen-oxygen fuel cells, organic hydrodehydrogenation, high-temperature pigments, and luminescent substrates. Materials and other aspects have broad application prospects. [0003] There are many methods for preparing rare earth samarium zirconate, the most common of which are solid state reaction method, ...

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Problems solved by technology

They have their own advantages and disadvantages: the products prepared by the sol-gel method have good uniformity, small particle size, and large specific surface area. The disadvantages are that the organic solvent is toxic and requires high-temperature calcination; the high-temperature solid-phase method does not require solvents during the preparation process and has high yields. , The process is simple, the disadvantage is that the obtained product has a large particle size, and the agglomeration is severe, the specific surface area is small, and the crystallinity is poor

The ceramic powder prepared by the chemical co-precipitation method has a fine particle size and good sintering performance. The disadvantage is that the formed precipitate is in a colloidal state, which is difficult to filter and wash, and has serious agglomeration during the drying and dehydration process.

At present, the preparation of rare earth zirconates is mainly concentrated on high-temperature solid-phase synthesis, but the temperature required for the reaction is very high, and a long reaction time is required; at the same time, it is also reported that rare earth zirconates are synthesized by methods such as hydrazine hydrate. The problem is that the particle size is large and the particle agglomeration is serious

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