Sm-Gd-Dy tri-rare-earth ion tantalate and preparation method and application thereof

Abstract

The invention discloses a Sm-Gd-Dy tri-rare-earth ion tantalate and a preparation method and application thereof. The general chemical formula of the Sm-Gd-Dy tri-rare-earth ion tantalate is SmGdDy<c>TaO<7>, wherein the a, b and c meet the relationship of a+b+c=3 and are separately in a range of 0.8-1.2. The preparation method comprises the following steps: (1) weighing samarium nitrate, gadolinium nitrate, dysprosium nitrate and tantalum oxalate according to a stoichiometric ratio, performing mechanical mixing with citric acid with a preset amount under a heat preservation condition, adding a concentrated ammonia water neutralization solution during the mixing process, and carrying out mechanical mixing to promote a complexation reaction under a heat preservation condition; and (2)drying the obtained solution, and then carrying out calcination at a high temperature to remove carbon impurities to obtain the Sm-Gd-Dy tri-rare-earth ion tantalate powder. The Sm-Gd-Dy tri-rare-earth ion tantalate has good high-temperature thermal stability and low thermal conductivity, and can be used as a thermal barrier coating material.

Description

technical field [0001] The invention relates to a tantalate, in particular to a Sm-Gd-Dy 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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