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
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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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