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Large grain spherical sub-micron/nano composite fiber-ceramic powder

A ceramic composite, spherical powder technology, applied in the field of large-particle spherical ceramic composite powder, large-particle spherical micro/nano/fiber ceramic composite powder, can solve the problem of inability to form a thermal spray coating, poor fluidity, and poor coating performance and other issues, to achieve good market application prospects and commercial value, good transportation characteristics, and good liquidity.

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 document is only composed of nano-scale ceramic powder, and does not involve large-particle spherical sub-micron / nanometer / short-fiber ceramic powders composed of powders of more than two sizes in the three primary ceramic powders of submicron, nanometer, and short fiber. Fiber-ceramic composite powder, and the nano-particles in the coating prepared by thermal spraying or laser cladding from pure nano-powder powder 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

[0014] Large particle spherical 94% submicron alumina + 3% nano titanium oxide + 3% fiber alumina ceramic composite powder

[0015] By weight percentage, it is composed of 94% submicron alumina, 3% nano-titanium oxide and 3% fiber alumina. The above powders are mixed, wet ball milling, centrifugal or pressure spray granulation, heat treatment process and plasma spheroidization, Prepared large-particle spherical submicron / nano / fiber composite ceramic powder. The characteristics of the powder are: its structure is a solid spherical or nearly spherical structure, the average particle diameter of the powder is 29 microns, and the particle size distribution is between 5 and 57 microns. Between them, it is a solid spherical or nearly spherical structure.

Embodiment 2

[0017] Large-particle spherical 60% submicron alumina + 40% nano-titanium oxide ceramic composite powder

[0018] According to the percentage by weight, it is composed of 60% submicron alumina and 40% nano-titanium oxide. The above powders are mixed, and the large particle spherical sub Micron / nano / fiber composite ceramic powder, the characteristics of the powder are: its structure is a solid spherical or nearly spherical structure, the average diameter of the powder particles is 34 microns, the particle size distribution is between 10 and 100 microns, and it is a solid spherical shape or nearly spherical structure.

Embodiment 3

[0020] Large spherical 97% submicron WC-12Co / 3%wt nano TiO 2 Composite ceramic powder

[0021] By weight percentage, it is composed of 97% WC-12Co and 3% nano-titanium oxide. The above powders are mixed, and large-particle spherical submicron is prepared by wet ball milling, centrifugal or pressure spray granulation, heat treatment process and plasma spheroidization. / Nano / fiber composite ceramic powder, the powder is characterized by: its structure is a solid spherical or nearly spherical structure, the average diameter of the powder particles is 37 microns, and the particle size distribution is between 10 and 100 microns.

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PUM

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Abstract

The present invention relates to ceramic material technology. The composite fiber-ceramic powder consists of two or three of the following materials: submicron powder of below 1 micron size in 60-97wt% of one or two selected from alumina, zirconia, cobalt clad carbide, Ni-Cr carbide, SiC and SiN; nano-grade powder of below 100 nm size in 2-40 wt% of one or two selected from alumina, titania, zirconia, silica, SiC and SiN; and short fiber ceramic of 1 micron below diameter and 5 micron below length in 3-10 wt% of one selected from alumina, SiC and SiN. Inside the large particle powder, the components have close combination, good flowability and excellent transportation characteristic, so that the composite powder may be used in hot spraying, laser melting and covering and other surface process and ceramic sintering to prepare excellent composite ceramic coating and block.

Description

technical field [0001] The invention relates to a large-particle spherical ceramic composite powder, in particular to a large-particle spherical micro / nano / fiber ceramic composite powder used for thermal spraying, laser cladding and sintering, and 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 strength and toughness are poor, which can easil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/10C04B35/12C04B35/49C04B35/56C04B35/565C04B35/584C04B35/622
Inventor 孙宝德王俊翟长生陈海龑李飞
Owner SHANGHAI JIAO TONG UNIV
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