Preparation method of thin-shell structure zirconia powder for thermal spraying

A technology of zirconia powder and thin shell structure, applied in the field of ceramic materials, can solve the problems of solidification of molten drop shell, high melting point of zirconia powder, large temperature gradient, etc.

Active Publication Date: 2018-04-17
苏州炻原新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the large temperature gradient of the plasma spray gun or the flame spray gun, the high melting point of the zirconia powder, the low thermal conductivity, and the short heating time of the powder in the flame flow, the temperature of the gas in the droplet is not high, and th

Method used

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  • Preparation method of thin-shell structure zirconia powder for thermal spraying
  • Preparation method of thin-shell structure zirconia powder for thermal spraying
  • Preparation method of thin-shell structure zirconia powder for thermal spraying

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0018] Example 1

[0019] Using 8% yttria stabilized zirconia powder granulated by spray, the particle size range is 20~106um, and it is calcined at 800℃ and kept for 2 hours. Use METCO 9MB plasma spray gun to spheroidize, set up a heat preservation zone at the spray gun outlet length of 500mm, radial 40mm area, collect the cooled powder at 1000mm outside the heat preservation zone exit, then a thin shell structure 8% with a hollowness of about 62% can be obtained Yttria stabilizes zirconia powder. The SEM image of the cross section of the prepared powder is attached Figure 2a , The SEM of the powder cross section without increasing the holding area is like Figure 2b . It can be seen that after increasing the holding area, the hollowness of the powder increases significantly.

Example Embodiment

[0020] Example 2

[0021] Using spray-granulated 7% yttrium oxide stabilized zirconia powder, with a particle size range of 20~106um, and calcined at 900°C for 2 hours. Spheroidizing with METCO 9MB plasma spray gun, set a heat preservation zone at the spray gun outlet length of 100mm and radial 40mm area, collect the cooled powder at 1000mm outside the heat preservation zone exit, then a thin shell structure zirconia powder with 54% hollowness can be obtained .

Example Embodiment

[0022] Example 3

[0023] Using 20% ​​calcium oxide stabilized zirconia powder granulated by spray, the particle size range is 20~106um, and it is calcined at 1000℃ and kept for 1 hour. Using METCO 9MB plasma spray gun for spheroidization, a heat preservation zone is set at a distance of 300mm from the spray gun outlet and a 50mm radial area, and the cooled powder is collected at a distance of 1000mm outside the heat preservation zone exit to obtain a thin-shell structure with a hollowness of 60% and stable calcium oxide Zirconia powder.

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Abstract

The invention discloses a preparation method of thin-shell structure zirconia powder for thermal spraying, which includes steps of step 1, preparing porous zirconia powder with grain diameter of 20-106 mu m by spraying and prilling, and calcining the prepared powder at 800-1000 DEG C; preserving temperature for 1-5 hours; step 2, delivering the calcined powder to a plasma spray gun to nodulize. The method is characterized in that a heat insulation zone is arranged in the zone along 10-500 mm of axial direction of a flame flow and 10-50 mm in a radial direction of a spray gun outlet, and the temperature in the heat insulation zone is not less than the melt point of the zirconia powder; step 3, collecting the cooled powder at outside of the heat insulation zone. Through arranging the lengthof the control zone, the hollow degree of the powder can be controlled, thus the powder with different hollow degrees can be acquired. For adopting the heat insulation method, additional heating device is not required to add. Therefore, the method is simple and feasible, and low in cost.

Description

technical field [0001] The invention belongs to the field of ceramic materials, and in particular relates to a method for preparing zirconia powder with a thin shell structure for thermal spraying. Background technique [0002] Zirconia coating has a high melting point and low thermal conductivity, and is widely used in thermal protection of components working at high temperatures, such as turbine blades, flame tubes of aero-engines, nozzles of rocket engines, etc. Depending on the temperature, zirconia has three different phase structures: monoclinic, tetragonal and cubic, and the phase transition process is accompanied by a large volume change. Therefore, during use, usually according to the application environment, in zirconia Add phase stabilizers such as yttrium oxide, magnesium oxide, calcium oxide, cerium oxide, etc. to inhibit phase transition and prevent volume change from causing coating cracking. [0003] Common preparation methods for zirconia coatings include...

Claims

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Application Information

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IPC IPC(8): C04B35/48C04B35/626
CPCC04B35/48C04B35/62605C04B2235/3208C04B2235/3225C04B2235/3229C04B2235/3246
Inventor 李飞唐宁
Owner 苏州炻原新材料科技有限公司
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