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Composite rare earth zirconate thermal barrier coating ceramic material and preparation method thereof

A technology of thermal barrier coatings and ceramic materials, applied in the field of thermal barrier coating ceramic materials and their preparation, can solve the problems of phase change, high thermal conductivity, low thermal expansion coefficient, etc., achieve simple operation process, and enhance high temperature phase stability Sexual, no shedding effect

Inactive Publication Date: 2008-09-24
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a composite rare earth zirconate thermal barrier coating in order to solve the problems of severe phase transition, high thermal conductivity and low thermal expansion coefficient when the temperature of the existing thermal barrier coating ceramic material exceeds 1200 °C. Layer ceramic material and its preparation method

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  • Composite rare earth zirconate thermal barrier coating ceramic material and preparation method thereof
  • Composite rare earth zirconate thermal barrier coating ceramic material and preparation method thereof

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specific Embodiment approach 1

[0012] Specific implementation mode one: the molecular formula of the composite rare earth zirconate thermal barrier coating ceramic material in this implementation mode is (Ln x Yb 1-x ) 2 Zr 2 o 7 , in molar ratio by 2 moles of zirconia, x moles of rare earth oxide Ln 2 o 3 and 1-x moles of rare earth oxide Yb 2 o 3 Made; where 02 o 3 Ln in is one of Nd, Sm, Gd; rare earth oxide Ln 2 o 3 Ln in is composed of two or more rare earth elements in Nd, Sm and Gd.

[0013] In this embodiment, the rare earth oxide Ln 2 o 3 The Ln in is composed of two or more rare earth elements in Nd, Sm and Gd, and the composition elements can be in any proportion relationship.

[0014] In this embodiment, the thermal conductivity and thermal expansion coefficient of the composite rare earth zirconate thermal barrier coating ceramic material prepared by selecting different raw material components at 1400°C are shown in Table 1.

[0015] Table 1

[0016] chemical formula

[...

specific Embodiment approach 2

[0018] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the rare earth oxide Ln 2 o 3 Ln in the medium is composed of two or more rare earth elements, and the relationship between the rare earth elements can be any ratio. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0019] Specific Embodiment Three: In this embodiment, the composite rare earth zirconate thermal barrier coating ceramic material is prepared according to the following method: 1. The molar ratio is 2 moles of zirconia and x moles of rare earth oxide Ln 2 o 3 and 1-x moles of rare earth oxide Yb 2 o 3 Mix to obtain a mixed powder; 2. Add deionized water equal to the volume of the mixed powder, and ball mill for 6 to 12 hours to obtain a mixed solution; 3. Dry the mixed solution at a temperature of 120°C to obtain a dried Mix the powder; 4. Put the dried mixed powder into the air atmosphere, raise the temperature from room temperature to 1000-1250 °C at a heating rate of 5 °C / min, and heat-preserve it for 4-12 hours, then cool to room temperature, and then ball mill 22-26 hours to obtain powder A; 5. Heat powder A from room temperature to 1250-1350 °C at a heating rate of 5 °C / min, heat-preserve for 4-12 hours, cool to room temperature, and ball mill for 22-26 hours to obtain...

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Abstract

The present invention provides composite rare earth zirconate thermal barrier ceramic material and a preparation method thereof, and relates to the thermal barrier coating ceramic material and the preparation method. The preparation method solves the problems of the complex process, the high costs, the serious phase change at the temperature above 1200 DEG C, the high thermal conductivity, the low coefficient of thermal expansion and so on in the existing preparation method of the thermal barrier coating ceramic material. The composite rare earth zirconate thermal barrier ceramic material is made of zirconia, rare earth oxide Ln2O3 and rare earth oxide Yb2O3. The preparation method comprises the following steps: 1, the zirconia, the rare earth oxide Ln2O3 and the rare earth oxide Yb2O3 are mixed; 2, deionized water is added for ball milling and the dried mixed powder can be prepared after drying; 3, powder C can be prepared after a plurality of processing steps; 4, the powder C is cooled and molded by isostatic pressing to prepare a green body; 5, the green body is sintered to prepare the composite rare earth zirconate thermal barrier ceramic material. The preparation method has the advantages of simple process, low cost, no phase change of the product at high temperature, low thermal conductivity and high coefficient of thermal expansion.

Description

technical field [0001] The invention relates to a thermal barrier coating ceramic material and a preparation method thereof Background technique [0002] With the rapid development of the aerospace industry, the engine is rapidly developing towards a high thrust-to-weight ratio, and the inlet temperature of the turbine blades is also increasing. For engines developed abroad in the 1970s, the gas inlet temperature in front of the turbine blades had reached above 1300°C; in the 1990s, the gas inlet temperature in front of the turbine blades had reached 1550°C to 1650°C. In order to adapt to such a high gas temperature, there are three corresponding measures: one is to develop more advanced high-temperature single crystal alloy materials; the other is to further improve the cooling technology; the third is to develop high-performance thermal barrier coating ceramic materials. At present, the development of superalloys for the first measure has entered the fifth generation, and...

Claims

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Application Information

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IPC IPC(8): C04B35/48
Inventor 欧阳家虎刘占国周玉
Owner HARBIN INST OF TECH
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