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Thermal barrier coating material of eutectic structure and method for manufacturing thermal spraying powder particles by utilizing material

A technology of thermal barrier coating and manufacturing method, which is applied in the field of high-temperature-resistant ceramic materials, can solve problems such as micro-pore sintering shrinkage, phase transformation, and grain growth, achieve good high-temperature phase and chemical composition stability, and overcome crystallization. Effect of grain size and low thermal conductivity

Active Publication Date: 2015-09-09
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 above 1200 °C, the coating material has phase transition, grain growth, and micropore sintering shrinkage, which increases the thermal conductivity of the coating, and the coating and metal Or the thermal stress of the bonding interface of the alloy increases, causing the coating to peel off, resulting in a reduction in the service life of the high-temperature heat engine

Method used

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  • Thermal barrier coating material of eutectic structure and method for manufacturing thermal spraying powder particles by utilizing material
  • Thermal barrier coating material of eutectic structure and method for manufacturing thermal spraying powder particles by utilizing material
  • Thermal barrier coating material of eutectic structure and method for manufacturing thermal spraying powder particles by utilizing material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Embodiment 1: preparation chemical composition is (La 0.5 Yb 0.5 ) 2 Zr 2 o 7 Thermal Barrier Coating Materials:

[0033] a The lanthanum oxide, ytterbium oxide and zirconium oxide with a purity greater than 99wt.% are classified according to their chemical composition (La 0.5 Yb 0.5 ) 2 Zr 2 o 7 The molar ratio was mixed, and a certain amount of absolute ethanol was added for ball milling for 4 hours, and then dried.

[0034] b After 20MPa dry pressing and 200MPa cold isostatic pressing, the blank is made.

[0035] c Place the 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.

[0036] d obtains the chemical composition as (La 0.5 Yb 0.5 ) 2 Zr 2 o 7 Material, the thermal conductivity of the sample is 1.3W / m·K~1.5W / m·K, and the coefficient of thermal expansion is 11.0×10 -6 / K~11.5×10 -6 / K (700℃~1300℃), th...

Embodiment 2

[0038] Embodiment 2: preparation chemical composition is (Ce 0.5 Yb 0.5 ) 2 Zr 2 o 7 Thermal Barrier Coating Materials:

[0039] a the mass percentage is 99wt% lanthanum oxide, ytterbium oxide and zirconium oxide with chemical composition (Ce 0.6 Yb 0.4 ) 2 Zr 2 o 7 The molar ratio was mixed, and a certain amount of absolute alcohol was added for ball milling for 4 hours, and then dried.

[0040] b After 20MPa dry pressing and 200MPa cold isostatic pressing, the blank is made.

[0041] 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.

[0042] d obtains the chemical composition as (Ce 0.5 Yb 0.5 ) 2 Zr2 o 7 Material, the thermal conductivity of the sample is 0.9W / m·K~1.4W / m·K, and the coefficient of thermal expansion is 10.9×10 -6 / K~11.5×10 -6 / K (700℃~1300℃), the elastic modulus is 222~235GPa....

Embodiment 3

[0044] Embodiment 3: preparation chemical composition is (Pr 0.4 Y 0.6 ) 2 Zr 2 o 7 Thermal Barrier Coating Materials:

[0045] a The mass percent is 99wt% praseodymia, yttrium oxide and zirconium oxide with chemical composition (Pr 0.4 Y 0.6 ) 2 Zr 2 o 7 The molar ratio is mixed, and a certain amount of absolute alcohol is added to ball mill for 6 hours, and dried.

[0046] b After 20MPa dry pressing and 200MPa cold isostatic pressing, the blank is made.

[0047] c Place the zirconia crucible with the blank in the electric furnace, raise the temperature to 1550°C, and perform a high-temperature reaction at 1550°C in an air atmosphere for 14 hours, and then cool with the furnace.

[0048] d obtains the chemical composition as (Pr 0.4 Y 0.6 ) 2 Zr 2 o 7 Material, the thermal conductivity of the sample is 1.6W / m·K~1.9W / m·K, and the coefficient of thermal expansion is 9.9×10 -6 / K~10.5×10 -6 / K (700℃~1300℃), the elastic modulus is 222~235GPa. .

[0049] e The a...

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Abstract

The invention relates to a thermal barrier coating material of a eutectic structure and a method for manufacturing thermal spraying powder particles by utilizing the material, which belongs to the technical field of high temperature-resistant ceramic materials. The structural formula of the material is (Ln11-xLn2x)2Zr2O7, and the material comprises two elements Ln1 and Ln2 in the form of metal oxides of at least two metals selected from La, Ce, La, Pr, Nd, Sm, Gd, Dy, Ho, Yb, Y and Sc, wherein the content x of the two elements is larger than or equal to 0.2 and smaller than or equal to 0.8. Raw materials are subjected to ball milling and then are mixed up, dried and pressed into blanks. After reacting with one another in an air atmosphere at 1500 DEG C to 1650 DEG C for a certain period of time, the materials form the (Ln11-xLn2x)2Zr2O7 eutectic material having two crystalline phases. Synthesized materials are ground to be fine and then mixed with a binder and a dispersing agent for ball-milling operation. After the spray granulation process, microspheres of 30 to 60 [mu]m in ball diameter can be obtained for preparing a heat-insulating coating through the plasma thermal-spraying process. The thermal barrier coating prepared by the above method is low in heat conductivity coefficient and high in toughness. The coating deterioration defect due to the growth and the sintering of crystal grains in a high-temperature working environment for a long term can be overcome.

Description

technical field [0001] The invention relates to a thermal barrier coating material with a eutectic structure and a method for producing powder particles which can be used for thermal spraying, and belongs to the technical field of high-temperature-resistant ceramic materials. Background technique [0002] Thermal barrier coating is to spray a layer of high temperature resistant material with low thermal conductivity on the surface of metal or alloy parts. work well at high temperatures. It is mainly used in various high-temperature heat engines, such as the surface heat insulation protective coating of the rotor or stator blade of gas turbine or jet engine, the inner wall of gas turbine or jet engine combustion, the inner wall of gasoline or diesel engine combustion, rocket nozzle, or some other Heat insulation and anti-oxidation coating materials for the inner wall of high-temperature burners, or other metal parts working in high-temperature environments. They are usually...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/48C04B35/622
Inventor 潘伟任小瑞万春磊
Owner TSINGHUA UNIV
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