Eu-Gd-Dy trirare earth ion tantalate and preparation method and application thereof

Abstract

The invention discloses Eu-Gd-Dy trirare earth ion tantalate and a preparation method and an application thereof, the Eu-Gd-Dy trirare earth ion tantalate has the chemical general formula of EuaGdbDycTaO7, wherein a+b+c=3, and a, b and c is 0.8-1.2. The preparation method comprises the following steps: 1) according to the stoichiometric ratio, weighing europium chloride, gadolinium nitrate, dysprosium nitrate and tantalum oxalate, mechanically mixing with citric acid with a set amount under a heat-retaining condition, adding strong aqua ammonia in the mixing process to neutralize the solution,and then mechanically mixing to promote the process of the reaction under a heat-retaining condition; and 2) drying the obtained solution, then calcining at high temperature to remove carbon impurities, and thus obtaining an Eu-Gd-Dy trirare earth ion tantalate powder. The Eu-Gd-Dy trirare earth ion tantalate has the advantages of good high temperature thermal stability and low thermal conductivity coefficient, and can be used as a thermal barrier coating material.

Description

technical field [0001] The invention relates to a tantalate, in particular to a Eu-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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