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

A technology of rare earth ions and tantalate, which is applied in the field of tantalate, can solve the problems of low temperature, coating failure, high melting point, etc., and achieve the effect of small grain size, few defects such as cracks, and high density

CN107698255AActive Publication Date: 2018-02-16陕西天璇涂层科技有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2018-02-16

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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.
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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...

Examples

Embodiment Construction

[0027] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments 1-7.

[0028] The Eu-Gd-Dy triple rare earth ion tantalate provided by the present invention has a general chemical formula of Eu a Gd b Dy c TaO 7 , wherein, a+b+c=3, a, b, c=0.8~1.2. In each embodiment, the coefficients of Eu, Gd, and Dy are detailed in Table 1.

[0029] The preparation steps of the above-mentioned Eu-Gd-Dy triple rare earth ion tantalate are as follows:

[0030] (1) Weigh europium chloride (EuCl 3 ), gadolinium nitrate (Gd(NO 3 ) 3 ), dysprosium nitrate (Dy(NO 3 ) 3 ) and tantalum oxalate (Ta 2 (C 2 o 4 ) 5 ), added to citric acid (C 6 h 8 o 7 ), the specific additions of each embodiment are shown in Table 1 (need to be converted into mass when weighing, and in the present invention, the stoichiometric ratio is conveniently expressed so the moles are used for measurement). Incubate at 135°C for 50min ...