Prepn of large grain spherical submicron/nano composite fiber-ceramic powder

A fiber composite and ceramic composite technology, applied in the field of ceramic materials, can solve the problems of inability to form a thermal spray layer, blockage of tens of millions of conveying pipelines, and small powder impulse, and achieve good market application prospects, commercial value, and large market application prospects. , Excellent thermal shock performance

Inactive Publication Date: 2003-11-05
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the powder involved in this patent is only composed of nano-scale ceramic powder, and does not involve large-particle spherical sub-micron / nano / short-fiber ceramic powders composed of powders of more than two sizes among the three primary ceramic powders of submicron, nanometer, and short fiber. Fiber-ceramic composite powder and its preparation method, and the nano-particles in the coating prepared by pure nano-powder powder by thermal spraying or laser cladding grow significantly, and the porosity is high, and its performance does not achieve the expected effect
In addition, the high cost of the coating prepared from pure nano-ceramic powder greatly limits its application in civil industry
Due to the small mass and large specific surface area of ​​the ceramic powder with a scale of submicron, nano and short fibers, its fluidity is poor, and it is very easy to block the pipeline during the spraying process. On the other hand, this single The component powder and its directly mixed powder have a small impulse, and are easy to grow during the thermal spraying process, and cannot form a dense thermal spraying coating, resulting in poor coating performance. Therefore, this type of powder cannot be directly applied to thermal spraying

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1 Preparation of large particle spherical 87% by weight submicron alumina / 13% by weight nano-titanium oxide composite ceramic powder

[0022] Prepare the oxide in a specified proportion into a solid material for slurry, the weight ratio of solid material and deionized water is: 1:0.5, the content of A15 is about 0.3% of the weight of the solid material, and the content of PVA is about 3% of the weight of the solid material 0.8%, n-butanol is about 0.5% of the weight of solid material, and the weight ratio of solid material and ball milling medium is about 1:2. Carry out wet ball milling according to the above ratio for 8 hours; spray granulate the water-based colloid prepared by ball milling, the inlet air temperature is 320°C, the outlet air temperature is 120°C, and the flow rate is 5kg / h; After granulation, the large-particle spherical submicron alumina / nano-titania composite ceramic powder is heat-treated, and the heat-treatment temperature is 800°C; then th...

Embodiment 2

[0023] Example 2 Preparation of large particle spherical 94% by weight submicron alumina / 3% by weight nano-titanium oxide / 3% by weight. Short fiber alumina composite ceramic powder

[0024] Prepare the oxide in a specified proportion into a solid material for slurry, the weight ratio of solid material and deionized water is: 1:1, the content of A15 is about 0.5% of the weight of the solid material, and the content of PVA is about 0.5% of the weight of the solid material. 1%, n-butanol is about 0.5% of solid content weight, and the weight ratio of solid material and ball milling medium is about: 1:2. Carry out wet ball milling according to the above ratio for 13 hours; spray granulate the water-based colloid prepared by ball milling, the inlet air temperature is 350°C, the outlet air temperature is between 120°C, and the flow rate is 5kg / h; The furnace heat-treats the large-particle spherical submicron alumina / nano-titania composite ceramic powder after spray granulation, and t...

Embodiment 3

[0025] Example 3 Preparation of large particle spherical 95% by weight submicron silicon nitride + 5% by weight nano-alumina ceramic composite powder

[0026] According to weight percentage, it is composed of 95% submicron silicon nitride and 5% nanometer silicon carbide. The characteristics of its powder are: its structure is a solid spherical or nearly spherical structure, the average diameter of powder particles is 26 microns, and the particle size distribution is 5 ~80 microns.

[0027] Prepare the oxide in a specified proportion into a solid material for slurry, the weight ratio of solid material and deionized water is: 1:0.8, the content of A15 is about 0.5% of the weight of the solid material, and the content of PVA is about 2% of the weight of the solid material 1.%, n-butanol is about 0.5.% of solid content weight, and the weight ratio of solid material and ball milling medium is about: 1: 2.5. Wet ball milling was carried out for 12 hours according to the above rati...

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Abstract

The present invention belongs to the field of ceramic material. The preparation of large grain spherical submicron/nano composite fiber-ceramic powder includes the following steps: wet ball milling to obtain water-base submicron/nano fiber-ceramic colloid; centrifuging or pressurized spraying of the submicron/nano fiber-ceramic colloid to prepare large grain spherical submicron/nano composite fiber-ceramic powder; heat treating to eliminate organic component and water; and plasma densifying and sphericizing to obtain large grain spherical submicron/nano composite fiber-ceramic powder product. The present invention may be used in preparing hot sprayed coating and sintered body with high strength, high toughness, high heat impact performance, and excellent anticorrosive performance and wear resistance.

Description

technical field [0001] The present invention relates to a method for preparing a large-particle spherical ceramic composite powder, in particular a method for preparing a large-particle spherical micro / nano / fiber ceramic composite powder for thermal spraying, laser cladding and sintering. It belongs to the field of ceramic materials. Background technique [0002] Thermal spraying and laser cladding traditional micron-sized ceramics and their composite ceramic powders are widely used in industry because they can prepare ceramic coatings with excellent properties such as wear resistance, oxidation resistance, and corrosion resistance. However, due to the fact that most of the particles of the traditional micron-sized ceramic powder are in a completely melted state during spraying or cladding, the coating has a high content of metastable phase growth, high porosity, and large residual stress. Therefore, the gap between the coating and the substrate, the coating The internal st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J2/00C04B35/622C04B35/63
Inventor 孙宝德翟长生王俊李飞陈海龑
Owner SHANGHAI JIAO TONG UNIV
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