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Preparation method of ceramic powder for plasma physical vapor deposition

A technology of physical vapor deposition and ceramic powder, which is applied in the field of preparation of ceramic powder for thermal barrier coatings, can solve the problems that cannot meet the requirements of PS-PVD process, and achieve the effect of being suitable for application and promotion, good fluidity and porous structure

Inactive Publication Date: 2021-03-23
LIAONING SILICATE RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of this, the present invention provides a method for preparing ceramic powder for plasma physical vapor deposition, to solve the problem that the existing APS powder material cannot meet the PS-PVD process requirements

Method used

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  • Preparation method of ceramic powder for plasma physical vapor deposition
  • Preparation method of ceramic powder for plasma physical vapor deposition
  • Preparation method of ceramic powder for plasma physical vapor deposition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044]Weigh 9.5kg of nano-zirconia, 0.5kg of polyphenylene, weigh 2% of the amount of nano-zirconia, gum arabic, and add them to the stirring ball mill. Add zirconia according to the ratio of material: ball: water = 1:2:1 The ball and water were ground for 2 hours to prepare a slurry for atomization, wherein the nano-zirconia contained 6wt% yttrium oxide.

[0045] Add the above slurry into the stainless steel mixing drum of the atomization drying tower and keep stirring. Start the atomization drying tower, keep the inlet temperature above 320°C, and the outlet temperature not lower than 90°C, adjust the frequency of the feed controller to 13Hz, and the frequency of the atomization controller to 36Hz to atomize the slurry, and the atomized The powder falls into the stainless steel collection cylinder at the bottom of the drying tower.

[0046] Put the atomized powder into the sagger and put it into the firing furnace. Keep the powder at 550°C for 4 hours, take it out after co...

Embodiment 2

[0059] Weigh 9.0kg of nano-zirconia, 0.8kg of starch, weigh peach gum according to 3% of the amount of nano-zirconia, and add them to the stirring ball mill. Add zirconia balls and water, and grind for 2 hours to prepare a slurry for atomization, wherein the nano-zirconia contains 8wt% yttrium oxide.

[0060] Add the above slurry into the stainless steel mixing drum of the atomization drying tower and keep stirring. Start the atomization drying tower, keep the inlet temperature at about 330°C, and the outlet temperature not lower than 90°C, adjust the frequency of the feed controller to 14Hz, and the frequency of the atomization controller to 37Hz to atomize the slurry. The powder falls into the stainless steel collection cylinder at the bottom of the drying tower.

[0061] Put the atomized powder into the sagger and put it into the firing furnace. Heat the powder at 600°C for 4 hours, take it out after cooling.

[0062] Add the decomposed powder into an appropriate amount ...

Embodiment 3

[0074] Weigh 9.0kg of nano-zirconia, 1.0kg of starch, weigh polyvinyl alcohol according to 1% of the amount of nano-zirconia, add them to the stirring ball mill, and add zirconia balls according to the ratio of material: ball: water = 1:3:0.7 and water, and grind for 2 hours to prepare a slurry for atomization, wherein the nano-zirconia contains 8wt% yttrium oxide.

[0075] Add the above slurry into the stainless steel mixing drum of the atomization drying tower and keep stirring. Start the atomization drying tower, keep the inlet temperature at about 350°C, and the outlet temperature not lower than 90°C, adjust the frequency of the feed controller to 15Hz, and the frequency of the atomization controller to 38Hz to atomize the slurry, and the atomized The powder falls into the stainless steel collection cylinder at the bottom of the drying tower.

[0076] Put the atomized powder into the sagger and put it into the firing furnace. Heat the powder at 500°C for 5 hours, take it...

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Abstract

The invention discloses a preparation method of ceramic powder for plasma physical vapor deposition, which comprises the following steps of in order to meet the porous requirement of a powder materialin a PS-PVD process, adding a pore-forming agent into ingredients, carrying out atomization granulation, and setting a burning step to remove the pore-forming agent in the powder material, and on thebasis of no influence on the strength of powder particles, realizing the requirement for the porosity of powder particles. Meanwhile, the mode that overflow classification and airflow classificationare combined is adopted, the granularity of the powder is accurately controlled, the technological requirement of PS-PVD is met, and finally the powder material which is small in particle size, porousin structure and good in fluidity is obtained. The preparation method has the advantages of being simple, easy to operate, suitable for application and popularization and the like.

Description

technical field [0001] The disclosure of the invention relates to the technical field of preparing ceramic powders for thermal barrier coatings, in particular to a method for preparing ceramic powders for plasma physical vapor deposition. Background technique [0002] Currently, there are two main techniques for preparing thermal barrier coatings: atmospheric plasma spraying (APS) and electron beam physical vapor deposition (EB-PVD). The APS process is very mature, with simple operation, high spraying efficiency and good stability. It is the mainstream preparation process technology. However, it is not suitable for spraying workpieces with complex structures, and because the coating it prepares has a layered structure, the thermal stress accumulated during the thermal cycle will cause the coating to peel off and fail. Compared with APS, EB-PVD coating has a columnar structure, which has higher stress tolerance during thermal cycling and is not easy to peel off. At the same ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/48C04B35/626
CPCC04B35/48C04B35/62605C04B35/62685C04B2235/3246C04B2235/3225
Inventor 王世林吕延庆肖飞岳鑫赵洪俭张福林薛健
Owner LIAONING SILICATE RES INST
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