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Method for producing and using large particle ball nano ceramic powder

A nano-ceramic powder, production method technology, applied in ceramic layered products, chemical instruments and methods, layered products, etc., can solve problems such as changes in physical and chemical properties, large specific surface area, poor coating quality, etc. The effect of uniform structure, simple process flow and long service life

Inactive Publication Date: 2002-11-06
BAIFURUI MATERIAL HUNAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Research experiments at home and abroad show that nano powders smaller than 100nm cannot be directly used for thermal spraying
Because of the extremely poor fluidity of conventional nanopowders, they cannot be fed into plasma or high-speed flames. Due to the small mass of individual particles, the physical and chemical properties will change during thermal spraying, resulting in poor coating quality
[0004] The room temperature brittleness of traditional micron-sized ceramic powder materials has not been resolved after sintering; however, under the action of stress, the grain boundaries of nano-ceramic materials can slide, so that the formation and diffusion of cracks are greatly reduced, the toughness is improved, and the brittleness is greatly reduced.
[0005] Due to the poor fluidity and low tap density of conventional nano-ceramic powder, it is difficult to directly press into a high-density green body. In order to increase the density of sintered products, long-term high-temperature sintering is required, which will cause the grains to grow and make the material loss of nanostructural organization

Method used

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  • Method for producing and using large particle ball nano ceramic powder
  • Method for producing and using large particle ball nano ceramic powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Al 2 o 3 -3wt%TiO 2 The production method of large particle spherical nano-ceramic powder:

[0032] Al with an average particle size of 70nm 2 o 3 、TiO 2 Put the nano powder into the ball mill after batching according to the weight ratio, inject ultra-pure water according to the weight ratio of 1:1 to 3 with the nano powder, inject surfactant according to the total weight of 1 to 10wt% of the nano powder, and inject according to the weight ratio of the nano powder. The weight ratio of 1:1~2 is put into the zirconia ball milling medium with a diameter of Φ4.5mm~Φ10mm, and the ball milling is carried out for 6~12 hours; the water-based nano-colloid obtained by the ball mill is spray-dried, and the air temperature of the spray drying is 240-360°C, and the air outlet The temperature is 120-170°C, the flow rate is 5-50kg / h, and the large-particle spherical nano-ceramic powder of 5-90μm is obtained; the spray-dried large-particle spherical nano-ceramic powder is subjecte...

Embodiment 2

[0034] The production method of WC-12wt%Co large particle spherical nano-ceramic powder:

[0035] Put the WC powder and Co powder with an average particle size of 80nm into the ball mill according to the weight ratio, and inject ultra-pure water according to the weight ratio of 1:1 to 3 with the nano powder, and the total weight is 1 to 10wt of the nano powder. % Inject the surfactant, put into the tungsten carbide ball milling medium with a diameter of Φ4.5mm~Φ10mm according to the weight ratio of 1:1~2 with the powder, and mill for 6~12 hours; spray dry the water-based nano colloid obtained by the ball mill, and spray dry The wind temperature is 240-360°C, the outlet air temperature is 120-170°C, the flow rate is 5-50kg / h, and the large-particle spherical nano-ceramic powder of 5-90μm is obtained; the spray-dried large-particle spherical nano-ceramic powder is placed in the tube The heat treatment is carried out in a type furnace, protected by hydrogen, and the heat treatmen...

Embodiment 3

[0037] ZrO 2 -8wt%Y 2 o 3 Large-particle spherical nano-ceramic powders are prepared by plasma spraying to prepare thermal barrier coatings with nanostructures:

[0038]ZrO with an average particle size of 60 nm 2 , Y 2 o 3 Nano powder drops into ball mill after batching by weight, following steps refer to the production method of example 1., until obtaining finished product ZrO 2 -8wt%Y 2 o 3 Large particle spherical nano-ceramic powder.

[0039] The thermal spraying equipment used is an atmospheric plasma spraying machine with a rated power of 40-100KW for the convenience of users. Thermal spraying process parameters are as follows: working current is 500-800A, working voltage is 50-80V, flow rate of plasma generating gas (argon + a small amount of hydrogen) is 50-100L / min, spraying distance is 80-150mm, powder feeder carrier gas The flow rate is 3-8L / min, and the powder feeding speed is 10-100g / min.

[0040] The metal workpiece is first sprayed with a layer of NiC...

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Abstract

The production process of nano ceramic powder includes the steps of: wet ball milling to obtain water-thinned nano colloid; spray drying to obtain large particle spheircal nano ceramic powder; heat treatment; and plasma densifying the large particle spherical nano ceramic powder after being heat treated. The nano ceramic powder thus produced has good flowability and high density and may be used through hot spray painting and sintering to form. The present invention reduce fragility of ceramic and raise the performance of hot spray painted and sintered ceramic products.

Description

Technical field: [0001] The invention relates to a production method and an application method of a ceramic powder, in particular to a production method and an application method of a large-particle spherical nano-ceramic powder applied to thermal spraying and sintering. technical background: [0002] Thermal spraying uses traditional ceramic powder (micron scale) and optimized thermal spraying parameters to prepare a higher density coating, but in order to reduce the stress in the ceramic and prevent cracking, the substrate often needs to be cooled during spraying, and the result The reason is that the binding force of the particles in the coating is reduced. During the service process, the layered particles are easy to fall off, which greatly shortens its service life. However, when the ceramic material has a nanostructure, its room temperature brittleness is greatly reduced, the toughness is improved, and the internal stress and cracking in the coating are greatly reduced...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B18/00C04B35/622C04B35/626
Inventor 蒋显亮熊晟詹自勤贺惠明袁剑峰
Owner BAIFURUI MATERIAL HUNAN
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