Nano zirconium oxide spraying powder and preparation method thereof

A technology of nano-zirconia and spraying powder, which is applied in the field of nano-ceramic materials, can solve the problems of high production cost, increased thermal conductivity, and decreased heat insulation ability, and achieve high porosity, high cohesive strength, and increased porosity Effect

Inactive Publication Date: 2019-11-15
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 zirconium oxide spraying powder and preparation method thereof
  • Nano zirconium oxide spraying powder and preparation method thereof
  • Nano zirconium oxide spraying powder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] see figure 1 , figure 2 , a nano-zirconia spray powder, its preparation method comprises the following steps:

[0034] Step 1: Mix 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, and add a dispersant with a weight of 1% of the YSZ powder, and mix evenly to obtain a slurry;

[0035] Step 2: Grinding the slurry with a sand mill 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 finely ground slurry in an amount of 0.1% of the weight of the nanometer YSZ powder, and stir until uniform at a stirring speed of 30 rpm;

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

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

Embodiment 2

[0051] The present embodiment is a kind of nanometer zirconia spray powder, and its preparation method comprises as follows:

[0052] Step 1: Mix 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, and add a dispersant with a weight of 0.8% of the YSZ powder, and mix evenly to obtain a slurry;

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

[0054] Step 3: Add anionic polyacrylamide with a molecular weight of 10,000 to the finely ground slurry in an amount of 0.18% of the weight of the nanometer 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 added is 1.5% of the weight of the nanometer YSZ powder, and continue to stir at a stirring speed of 30 rpm until uniform;

[0056] Step 5: The slurry is spray-dried to obtain granulated materials; the inlet tempera...

Embodiment 3

[0064] The present embodiment is a kind of nanometer zirconia spray powder, and its preparation method comprises as follows:

[0065] Step 1: Mix 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, and add a dispersant with a weight of 0.5% of the YSZ powder, and mix evenly to obtain a slurry;

[0066] Step 2: Grinding 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 finely ground slurry in an amount of 0.06% of the weight of the nanometer YSZ powder, and stir until uniform at a stirring speed of 20 rpm;

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

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

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Abstract

The invention provides powder which has a non-hollow porous spherical structure and consists of nano zirconium oxide (YSZ) aggregates partially stabilized by yttrium oxide with the mass fraction of (7-8) wt%. The porosity of powder particles ranges from 40% to 70%, and the surfaces of the powder particles are of a porous rough structure. The powder is prepared by means of a conventional spray granulation process. The process comprises the steps of firstly, dispersing the nano YSZ aggregates through sand milling; then, adding a flocculant into the dispersed slurry to make the nano particles aggregated into loose flocculent aggregates so that the nano particles can be restrained from migrating to the surfaces in the spray granulation process and correspondingly formation of a hollow structure is avoided, and finally preparing the powder which has the non-hollow porous spherical structure and is high in porosity. By adopting the powder, a YSZ coating with the high porosity, high internalcohesive strength and great sintering resistance can be prepared.

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 spraying (7-8)wt% yttria partially stabilized zirconia (hereinafter referred to as YSZ) coating has extremely low thermal conductivity (~1.5w / m·k), high melting point (~2700°C), high Its creep temperature (~2400°C), excellent mechanical properties and thermal expansion coefficient similar to that of superalloys are widely used in the heat insulation protection of superalloy components such as aero-engine and gas turbine blades, rocket engine nozzles, etc. 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 increase the thrust-to-weight ratio of the engine by increasing the working tempe...

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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