A closed pore structure ceramic coating and its preparation process

A technology of ceramic coating and closed pores, which is applied in the direction of metal material coating process, coating, molten spraying, etc., can solve the problems of easy interconnection and unstable closed pores, etc., to reduce thermal conductivity and improve heat insulation effect of effect

Active Publication Date: 2020-12-18
XIAN TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention provides a ceramic coating with a closed pore structure and its preparation process to overcome the problems in the prior art that the closed pores are unstable and easy to communicate with each other to form a connected pore structure

Method used

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  • A closed pore structure ceramic coating and its preparation process
  • A closed pore structure ceramic coating and its preparation process

Examples

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Embodiment 1

[0020] A method for preparing a ceramic coating with a closed pore structure on the surface of a nickel-based alloy according to the present invention comprises the following steps:

[0021] (1) ZrO with a hollow porous structure in which the volume of the hollow part in the center is 50% 2 Ceramic powder, under the condition of plasma spraying power of 30kW, the ceramic powder spherical shell is partially melted and deposited, and a ceramic coating is prepared on the surface of the nickel-based alloy, and the hollow structure of the ceramic powder is retained in the ceramic coating.

[0022] (2) ZrO in the sprayed state 2 On the basis of ceramic coating (1), infiltration of Zr(OH) under the condition of 0.3MPa 4 Ceramic colloid for 20 minutes to seal the cracks and through-holes formed during the plasma spraying process.

[0023] (3) Heat treatment the pressure infiltrated ceramic coating (2), 110°C for 15 minutes to remove the physical moisture of the colloid, 280°C for 30...

Embodiment 2

[0025] A method for preparing a ceramic coating with a closed pore structure on the surface of an aluminum alloy according to the present invention, comprising the following steps:

[0026] (1) Al with a hollow porous structure whose volume is 80% in the hollow part of the center 2 o 3 Ceramic powder, under the condition of plasma spraying power of 25kW, the ceramic powder spherical shell is partially melted and deposited, and the ceramic coating is prepared on the surface of the aluminum alloy material, and the hollow structure of the ceramic powder is retained in the ceramic coating.

[0027] (2) Al in the sprayed state 2 o 3 On the basis of ceramic coating (1), infiltration of Al(OH) under the condition of 0.4MPa 3 Ceramic colloid for 20 minutes to seal the cracks and through-holes formed during the plasma spraying process.

[0028] (3) Heat treatment on the pressure infiltrated ceramic coating (2), 110°C for 15 minutes to remove the physical moisture of the colloid, 28...

Embodiment 3

[0031] A method for preparing a ceramic coating with a closed pore structure on the surface of vermicular graphite cast iron of the present invention, comprising the following steps:

[0032] (1) ZrO with a hollow porous structure in which the volume of the hollow part in the center is 30% 2 Ceramic powder, under the condition of plasma spraying power of 35kW, the ceramic powder spherical shell is partially melted and deposited, and the ceramic coating is prepared on the surface of the vermicular graphite cast iron, and the hollow structure of the ceramic powder is retained in the ceramic coating.

[0033] (2) ZrO in the sprayed state 2 On the basis of ceramic coating (1), infiltration of Zr(OH) under the condition of 0.4MPa 4 Ceramic colloid for 30 minutes to seal the cracks and through-holes formed during the plasma spraying process.

[0034] (3) Carry out heat treatment on the pressure-infiltrated ceramic coating (2), remove the physical moisture of the colloid at 110°C f...

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Abstract

The invention relates to the fields of materials of the aerospace industry, the metallurgical industry and the mechanical industry and processing technologies thereof, in particular to a sealed pore structure ceramic coating and a preparation technology thereof. The sealed pore structure ceramic coating and the preparation technology thereof aim to solve the problem that in the prior art, sealed pores are unsteady and prone to be communicated with one another to form a communicated pore structure. The preparation technology of the sealed pore structure ceramic coating comprises the following steps that 1, ZrO2 or Al2O3 ceramic powder of a hollow porous structure with the center hollow portion with the volume percentage of 50%-80% is subjected to a plasma spraying method to prepare a ceramic coating; 2, at 0.1-0.5 MPa, Zr(OH)4 or Al(OH)3 ceramic colloid pressure infiltration is conducted; 3, heat treatment is conducted on the ceramic coating after pressure infiltration. Pores in a prepared ceramic layer are sealed pores, the porosity is 5%-30%, and the thermal conductivity is 0.6-1.2 W / m.K, which is lower, so that the thermal insulation effect is effectively improved.

Description

technical field [0001] The invention relates to the technical fields of materials and processing in aerospace, metallurgy and machinery industries, and in particular to a ceramic coating with a closed pore structure and a preparation process thereof. Background technique [0002] Aerospace engines, gas turbines, internal combustion engines, boilers and other combustion chamber heating components have long been in high temperature service, and the strength and stiffness of structural materials drop significantly at high temperatures. Once their critical strength and stiffness reach their critical strength and stiffness, they will cause structural damage and cause major accidents. Therefore, thermal insulation protection measures must be taken to ensure the reliable operation of the heated components of the combustion chamber such as aerospace engines, gas turbines, internal combustion engines, and boilers. At present, ceramic materials have become the first choice for high-te...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/134C23C4/11C23C4/18C04B41/87
CPCC04B41/5031C04B41/5042C04B41/87C23C4/18C23C4/11C23C4/134C04B41/4539C04B41/0072
Inventor 高培虎郭永春杨忠李建平马志军段洪波
Owner XIAN TECH UNIV
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