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Rare earth zirconate high-temp heat barrier coating material and its preparation method

A coating material and zirconate technology, applied in the field of rare earth zirconate high temperature thermal barrier coating material and its preparation, can solve the problems of grain growth, interface thermal stress increase, thermal conductivity increase, etc. Effects of low sintering activity, high phase transition temperature, good high temperature chemical stability and thermal stability

Inactive Publication Date: 2005-08-24
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, during the long-term cycle use of YSZ at a temperature higher than 1200 ° C, the coating material has phase transition, grain growth, micropore shrinkage and sintering, etc., which increases the thermal conductivity and the thermal stress at the interface causes the coating Peeling, resulting in reduced service life of the heat engine

Method used

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  • Rare earth zirconate high-temp heat barrier coating material and its preparation method
  • Rare earth zirconate high-temp heat barrier coating material and its preparation method
  • Rare earth zirconate high-temp heat barrier coating material and its preparation method

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preparation example Construction

[0013] The present invention provides chemical composition as A 2 B 2 o 7 A rare earth zirconate high-temperature thermal barrier coating material whose crystal structure is pyrochlore or fluorite and a preparation method thereof. The rare earth zirconate high temperature thermal barrier coating material includes a rare earth oxide (La 2 o 3 ,Nd 2 o 3 , Sm 2 o 3 , Gd 2 o 3 , Dy 2 o 3 , Er 2 o 3 or Yb 2 o 3 ) powder and zirconia powder with a purity of 99wt%, the molar ratio is 1:2; wherein A is rare earth elements La, Nd, Sm, Gd, Dy; Er or Yb, etc., B is Zr. The preparation method of the rare earth zirconate thermal barrier coating material comprises the following steps:

[0014] 1) After weighing according to the molar ratio of a rare earth oxide and zirconia powder being 1:2, mixing by wet ball milling;

[0015] 2) After the above mixture is dried, it is pressed to obtain a compact blank.

[0016] 3) Put the above-mentioned blank in a zirconia container, pu...

Embodiment 1

[0019] Dysprosium oxide and zirconia as raw materials

[0020] a the mass percentage is 99wt% dysprosium oxide (Dy 2 o 3 ) and zirconia in a molar ratio of 1:2, added a certain amount of deionized water to ball mill for 24 hours, and dried.

[0021] b Dry pressing under 100MPa to form a blank.

[0022] c Place the zirconia crucible with the blank in the electric furnace, raise the temperature to 1600°C, and perform a high-temperature reaction at 1600°C in an air atmosphere for 10 hours, and then cool with the furnace.

[0023] d After cooling, take out the reactant, then pulverize and grind to a powder below 5 microns.

[0024] e obtains the chemical molecular formula as: Dy 2 Zr 2 o 7 Material, the thermal conductivity of the sample is 1.20W / m K (600°C), and the thermal expansion coefficient is 8.2~11.0×10 -6 / K, the modulus of elasticity is 145GPa.

[0025] f After adding a certain amount of binder to the above-mentioned powder, obtain spherical granular substances w...

Embodiment 2

[0027] Using gadolinia and zirconia as raw materials

[0028] a the mass percent is 99wt% gadolinium oxide (Gd 2 o 3 ) and zirconia in a molar ratio of 1:2, added a certain amount of deionized water to ball mill for 24 hours, and dried.

[0029] b Dry pressing under 100MPa to form a blank.

[0030] c Place the zirconia crucible with the blank in the electric furnace, raise the temperature to 1650°C, and perform a high-temperature reaction at 1650°C in an air atmosphere for 8 hours, and then cool with the furnace.

[0031] d After cooling, take out the reactant, then pulverize and grind to a powder below 5 microns.

[0032] e obtains the chemical molecular formula as: Gd 2 Zr 2 o 7 Material, the thermal conductivity of the sample is 1.39W / m K (600°C), and the thermal expansion coefficient is 11.1×10 -6 / °C, the modulus of elasticity is 182Pa.

[0033] f After adding a certain amount of binder to the above-mentioned powder, obtain spherical granular substances with an av...

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Abstract

A RE zirconate coating material for preparing high-temp heat barrier layer has a chemical formula: A2B2O7, where A is chosen from La, Nd, Sm, Gd, Dy, Er and Yb and B is Zr. It is prepared through ball grinding of raw materials, baking, die pressing, and reaction in air at 1550-1650 deg.C. It has low heat conductivity and high high-temp stability.

Description

technical field [0001] The invention belongs to the field of thermal insulation materials, in particular to a rare earth zirconate high-temperature thermal barrier coating material and a preparation method thereof. Background technique [0002] Thermal barrier coating is to spray a layer of high-temperature-resistant material with low thermal conductivity on the surface of the parts. This coating can reduce the heating temperature of the metal matrix, prevent the oxidation of the matrix alloy, and ensure that these parts work normally at relatively high temperatures. . It is mainly used in various high-temperature heat engines, such as the surface heat insulation coating of the rotor or stator blade of a gas turbine or a jet, the inner wall of an engine combustion chamber, the inner wall of a gasoline or diesel engine combustion engine, the rocket nozzle, or the inner wall of some other high-temperature burners, Or some heat insulation and anti-oxidation coating materials f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D1/00C09D5/18
Inventor 潘伟徐强王敬栋万春磊
Owner TSINGHUA UNIV
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