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

A technology of rare earth ions and tantalate, 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, less defects such as cracks, and high density

Active Publication Date: 2018-01-16
陕西天璇涂层科技有限公司
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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

Method used

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

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[0027] The present invention will be further described in detail below with reference to the drawings and specific embodiments 1-8.

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

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

[0030] (1) Weigh samarium nitrate (Sm(NO 3 ) 3 ), Gadolinium Nitrate (Gd(NO 3 ) 3 ), Dy(NO 3 ) 3 ) And tantalum oxalate (Ta 2 (C 2 O 4 ) 5 ), added to citric acid (C 6 H 8 O 7 In ), the specific addition amount of each embodiment is shown in Table 1 (it needs to be converted into mass when weighing, and in the present invention, it is measured by mole for the convenience of expressing the stoichiometric ratio). Incubate at 135°C for 50 minutes and perform vigorous mechanical stirring to make it f...

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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...

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Application Information

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IPC IPC(8): C01G35/00C04B35/50C04B35/495C04B35/622
Inventor 胡志辉周颖冯晶宋鹏陈咏君
Owner 陕西天璇涂层科技有限公司
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