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High-temperature thermal barrier coating material and preparation method thereof

A coating material and warming technology, applied in the field of materials, can solve the problems of easy grain growth, increased thermal conductivity, coating failure, etc., and achieve the effect of low material thermal conductivity and superior high temperature phase stability

Inactive Publication Date: 2013-10-09
SHANGHAI UNIV OF ENG SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Existing oxide-stabilized ZrO 2 It is currently the most widely used thermal barrier coating ceramic material. However, when this thermal barrier coating ceramic material is in service for a long time at a temperature higher than 1200 ° C, the grains are easy to grow, and the micropores in the coating Shrinkage and sintering will increase the thermal conductivity; what is more serious is that this material is prone to severe phase transformation when it is served at high temperature, and the resulting volume change will sharply increase the internal stress of the coating, prompting cracking and peeling of the coating, resulting in coating failure

Method used

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Examples

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Embodiment 1

[0042] Using aluminum chloride, magnesium chloride, gadolinium chloride and dysprosium chloride as raw materials to prepare nano-Gd 0.6 Dy 0.4 MgAl 11 o 19+δ Powder material.

[0043] (1) aluminum chloride (AlCl 3 ·6H 2 O, 99wt%), magnesium chloride (MgCl 2 ·6H 2 O, 99wt%), gadolinium chloride (GdCl 3 ·6H 2 O, 99.9wt%) and dysprosium chloride (DyCl 3 ·6H 2 (2, 99.9wt%) is mixed with the actual metal ion molar ratio of 11:1:0.6:0.4, and a certain amount of deionized water is added, stirred, and fully dissolved.

[0044] (2) Weigh acetic acid equal to the molar number of the total metal ions, dissolve it in deionized water, and adjust its pH value to 3 with dilute ammonia water with a volume fraction of 5%.

[0045] (3) Use a mechanical stirrer to stir the mixed metal salt solution under the condition of heating in a water bath. The heating temperature of the water bath is 90°C. At the same time, add the acetic acid solution with adjusted pH dropwise to the mixed meta...

Embodiment 2

[0051] Nano-La 0.3 Gd 0.5 b 0.2 MnAl 11 o 19+δ Powder material.

[0052] (1) Aluminum nitrate (Al(NO 3 ) 3 9H 2 O, 99wt%), manganese nitrate (Mn(NO 3 ) 2 , 50wt% aqueous solution), lanthanum nitrate (La(NO 3 ) 3 nH 2 O, La 2 o 3 content not less than 44wt%, gadolinium nitrate (Gd(NO 3 ) 3 6H 2 O, 99wt%) and ytterbium nitrate (Yb(NO 3 ) 3 5H 2 (2, 99.9wt%) is mixed with the actual metal ion molar ratio of 11:1:0.3:0.5:0.2, and a certain amount of deionized water is added, stirred, and fully dissolved.

[0053] (2) Weigh citric acid equal to the molar number of the total metal ions, dissolve it in deionized water, and adjust its pH value to 5 with dilute ammonia water with a volume fraction of 5%.

[0054] (3) Stir the mixed metal salt solution with a mechanical stirrer under water bath heating conditions. The water bath heating temperature is 80 ° C. At the same time, the citric acid solution that has adjusted the pH is added dropwise to the mixed metal salt...

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Abstract

The invention belongs to material technology, a high-temperature thermal barrier coating material and a preparation method thereof. When used at a high temperature, the conventional thermal barrier coating material is easy to undergo phase change and cause the failure of a coating. The general formula of a multi-component rare-earth high-temperature thermal barrier coating material is that: LnyLn<'>zLn<''>1-y-zMexAl12-xO19+delta, wherein Ln, Ln<'> and Ln<''> are rare earth elements such as La, Ce, Nd, Sm, Gd, Dy, Er and Yb; Me is metal elements such as Mn, Mg, Ni, Co, Sr, Ca and Ba; x is between 0 and 12; y is between 0 and 1; z is between 0 and 1; and y+z is less than or equal to 1. The preparation method comprises the following steps of: preparing mixed metal salt solution; preparing complexing agent solution; preparing mixed metal ion sol; and drying the mixture at the temperature of between 70 and 180 DEG C, and grinding and calcining the dried product to obtain the high-temperature thermal barrier coating material. The high-temperature thermal barrier coating material has the advantages of high temperature resistance, melting point of over 2,000 DEG C, high stability of high-temperature phase, no phase change from room temperature to 2,000 DEG C or higher temperature and low thermal conductivity.

Description

technical field [0001] The invention belongs to material technology, in particular to a high-temperature thermal barrier coating material and a preparation method. Background technique [0002] Existing superalloy materials cannot meet the high inlet temperature requirements of modern turbine engines. Thermal barrier coatings (TBCs) need to be prepared on metal parts such as combustion chamber walls and turbine blades to withstand higher temperatures, obtain qualified life, and improve engine performance. efficiency. [0003] The thermal barrier coating is composed of multiple layers of materials, which have the functions of heat insulation, high temperature oxidation resistance and corrosion resistance. Its typical structure is double-layer, consisting of a ceramic thermal barrier layer on the surface and a metal bonding layer in the middle. The ceramic thermal barrier layer actually plays the role of thermal insulation in the thermal barrier coating, which can effectively...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/01C04B35/10
Inventor 李志明钱士强王伟邝宣科黄晨李曼萍
Owner SHANGHAI UNIV OF ENG SCI
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