Nano-zirconia spray powder and production method thereof

A technology of nano-zirconia and spray powder, which is applied in the field of nano-ceramic materials, can solve the problems of increased thermal conductivity, high production cost, and large investment in equipment, and achieves increased porosity, high cohesive strength, and high porosity. Effect

Active Publication Date: 2020-01-10
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

Although this type of coating also has very low thermal conductivity, the flat particle interface is easy to be sintered at high temperature. After the coating is used at high temperature for a short period of time, the thermal conductivity rises rapidly and the heat insulation ability decreases.
[0007] Although some studies have shown that using nano-YSZ as raw material, spherical powder with a porosity of more than 40% can be prepared by spray freezing method (Spray freeze drying). The ice in the powder is slowly removed, the equipment investment is large, the efficiency is low, and the production cost is extremely high. At present, there is no relevant report on its use in the preparation of high-porosity spray powder

Method used

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  • Nano-zirconia spray powder and production method thereof
  • Nano-zirconia spray powder and production method thereof
  • Nano-zirconia spray powder and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] see figure 1 , figure 2 , a kind of nano zirconia spray powder, its preparation method comprises as follows:

[0034] Step 1: Mix the nano-YSZ powder with a grain size of 40nm and a yttrium oxide content of 7.2wt% and deionized water at a ratio of 1:3, add a dispersant of 1% by weight of the YSZ powder, and mix uniformly to obtain a slurry;

[0035] Step 2: use a sand mill to grind the slurry until the particle size in the slurry is less than 200nm;

[0036] Step 3: add anionic polyacrylamide with a molecular weight of 8000 to the ground slurry, the amount of which is 0.1% of the weight of the nano YSZ powder, and stir to uniform at a stirring speed of 30 rpm;

[0037] Step 4: Continue to add acrylic resin to the slurry, and the added amount is 2% of the weight of the nano YSZ powder, and continue to stir at a stirring speed of 30 rpm until it is uniform;

[0038] Step 5: the slurry is spray-dried to obtain granulated material; the inlet temperature during granulation...

Embodiment 2

[0051] The present embodiment is a nano-zirconia spray powder, and its preparation method includes the following:

[0052] Step 1: Mix the nano-YSZ powder with a grain size of 30nm and a yttrium oxide content of 7.5wt% and deionized water at a ratio of 1:2.5, add a dispersant with a weight of 0.8% of the YSZ powder, and mix uniformly to obtain a slurry;

[0053] Step 2: Grind the slurry with a sand mill until the particle size in the slurry is less than 100 nm;

[0054] Step 3: Add anionic polyacrylamide with a molecular weight of 10,000 to the ground slurry, the amount of which is 0.18% of the weight of the nano-YSZ powder, and stir until uniform at a stirring speed of 20 rpm;

[0055] Step 4: Continue to add acrylic resin to the slurry, the amount of addition is 1.5% of the weight of the nano YSZ powder, and continue to stir at a stirring speed of 30 rpm until it is uniform;

[0056] Step 5: the slurry is spray-dried to obtain granulated material; the inlet temperature duri...

Embodiment 3

[0064] The present embodiment is a nano-zirconia spray powder, and its preparation method includes the following:

[0065] Step 1: Mix the nano-YSZ powder with a grain size of 80nm and a yttrium oxide content of 7.25wt% and deionized water at a ratio of 1:2, add a dispersant with a weight of 0.5% of the YSZ powder, and mix uniformly to obtain a slurry;

[0066] Step 2: Grind the slurry with a sand mill until the particle size in the slurry is less than 300nm;

[0067] Step 3: Add anionic polyacrylamide with a molecular weight of 12,000 to the ground slurry, and the addition amount is 0.06% of the weight of the nano-YSZ powder, and stir at a stirring speed of 20 rpm until it is uniform;

[0068] Step 4: Continue to add acrylic resin to the slurry, the amount of addition is 1.5% of the weight of the nano YSZ powder, and continue to stir at a stirring speed of 30 rpm until it is uniform;

[0069] Step 5: The slurry is spray-dried to obtain granulated material; the inlet temperat...

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Abstract

The invention provides non-hollow porous spherical-structure powder composed of aggregate of nanometer yttria-partially stabilized zirconia (YSZ) with a mass fraction of 7 wt% to 8 wt%. The porosity of powder particles is 40% to 70%, and surfaces are of porous rough structures. The powder is produced by adopting a conventional spray granulation technology: firstly, nanometer YSZ aggregate is dispersed by adopting sanding, and then a flocculating agent is added into dispersed slurry to make nanometer particles aggregate, so as to form the loose flocculent aggregate, so that surface migration ofthe nanometer particles in the spray granulation process is inhibited, a hollow structure is avoided, and finally, the non-hollow porous spherical-structure powder with high porosity is produced. Byadopting the powder, a YSZ coating with high porosity, high cohesion strength and sintering resistance can be produced.

Description

technical field [0001] The invention belongs to the field of nano-ceramic materials, and in particular relates to a nano-zirconia spray powder for preparing a coating with high porosity, high cohesive strength and sintering resistance and a preparation method thereof. Background technique [0002] Plasma sprayed (7-8) wt% yttrium oxide partially stabilized zirconia (hereinafter referred to as YSZ) coating has extremely low thermal conductivity (~1.5w / m k), high melting point (~2700℃), high High creep temperature (~2400 ℃), excellent mechanical properties and thermal expansion coefficient similar to superalloys, are widely used in aero-engine and gas turbine blades, rocket engine nozzles and other high-temperature alloy components thermal insulation protection. The use of YSZ coating can not only reduce the working temperature of the components and prolong the service life of the components, but also improve the thrust-to-weight ratio of the engine by increasing the working t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/48C04B35/626
CPCC04B35/48C04B35/62605C04B2235/3246C04B2235/5454
Inventor 李飞
Owner 苏州炻原新材料科技有限公司
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