Sm-Eu-Gd trirare earth ion tantalate as well as preparation method and application thereof

Abstract

The invention discloses Sm-Eu-Gd trirare earth ion tantalate as well as a preparation method and application thereof. The chemical general formula of the Sm-Eu-Gd trirare earth ion tantalate is SmaEubGdcTaO7, wherein a+b+c is equal to 3, and a,b,c is equal to 0.8 to 1.2. The preparation method of the Sm-Eu-Gd trirare earth ion tantalate comprises the following steps: (1) weighing europium chloride, gadolinium nitrate, samarium nitrate and tantalum oxalate according to a stoichiometric ratio, mechanically mixing with a set amount of citric acid under heat preservation conditions, adding a concentrated ammonium hydroxide neutralizing solution in a mixing process, and then mechanically mixing under the heat preservation conditions to promote the process of reaction; (2) drying the obtained solution, and then calcining at high temperature to remove carbon impurities to obtain Sm-Eu-Gd trirare earth ion tantalate powder. The Sm-Eu-Gd trirare earth ion tantalate is high in high-temperature thermal stability and low in thermal conductivity coefficient, and can be applied as a thermal barrier coating material.

Description

technical field [0001] The invention relates to a tantalate, in particular to a Sm-Eu-Gd triple rare earth ion tantalate and its preparation method and application. Background technique [0002] With the development of aviation, aerospace and civil technology, the temperature requirements of hot end components are getting higher and higher, which has reached the limit of superalloys and single crystal materials. Take the heated parts of fuel turbines such as nozzles, blades, and combustion chambers as examples. They are in harsh environments such as high-temperature oxidation and high-temperature airflow erosion, and they can withstand temperatures as high as 1100 ° C, which has exceeded the limit temperature of high-temperature nickel alloys (1075 ° C). . The thermal barrier coating prepared by combining the high strength and toughness of metal with the high temperature resistance of ceramics can solve the above problems. It can play the role of heat insulation, anti-oxida...

AI Technical Summary

Problems solved by technology

Among them, the most widely used is yttria stabilized zirconia (YSZ), which has a high melting point, low thermal conductivity, high thermal expansion coefficient and good mechanical properties, but the use temperature is low, only 1200 ° C, which is due to the temperature above 1200 ° C YSZ will undergo a phase change resulting in a volume change that will cause the coating to fail

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