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Preparation method of high-purity fine-grained zirconia ceramic bar for flame spraying

A technology of flame spraying and crystal zirconia, which is applied in the field of material surface protection, can solve the problems of low impurity content of zirconia powder raw materials, high impurity content of coating, poor coating uniformity, etc., and achieve low content of impurity elements and good coating structure Dense and good melting state

Inactive Publication Date: 2018-09-21
BEIJING MINING & METALLURGICAL TECH GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The zirconia powder raw material used in this method has low impurity content and small crystal grains, and the fired zirconia ceramic rods have the characteristics of high purity, fine grains, and high spraying uniformity, which overcomes the zirconia ceramic rods prepared by the prior art. After the rod is flame sprayed, the resulting coating has the disadvantages of high impurity content, poor coating uniformity, etc.

Method used

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  • Preparation method of high-purity fine-grained zirconia ceramic bar for flame spraying

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The selected primary grain size is 5-30nm, and the contents of 12 impurity elements such as Fe, Mn, Mg, Pb, Ti, W, Cr, Co, V, Mo, As, Ni are 7ppm, 6ppm, 10ppm, 7ppm, 10ppm respectively , 8ppm, 8ppm, 9ppm, 7ppm, 7ppm, 2ppm, 7ppm high-purity nano-zirconia powder is made by spraying and granulating process, the main particle size distribution range is 0.4-11.5μm, and the average particle size is d 50 =2.446μm spherical zirconia powder raw material.

[0022] Take 10 parts of polyvinyl alcohol with a degree of polymerization of 1600, dissolve it in 90 parts of distilled water at 85°C, stir evenly, and keep warm in a constant temperature water bath at 85°C for 6 hours. Mix zirconia powder raw materials, binder, paraffin, and glycerin in a mass ratio of 100:35:8:3, and use a vacuum mixer to mix and knead the mud until a zirconia plastic mud ball is obtained, and put the mud ball in a sealed state Aging for 15h.

[0023] Put the zirconia plastic clay ball into the vacuum extr...

Embodiment 2

[0026] The selected primary grain size is 10-40nm, and the contents of 12 impurity elements such as Fe, Mn, Mg, Pb, Ti, W, Cr, Co, V, Mo, As, Ni are 7ppm, 6ppm, 10ppm, 7ppm, 10ppm respectively , 8ppm, 8ppm, 9ppm, 7ppm, 7ppm, 2ppm, 7ppm high-purity nano-zirconia powder is made by spraying and granulating process, the main particle size distribution range is 0.4-11.5μm, and the average particle size is d 50 =2.446μm spherical zirconia powder raw material.

[0027] Take 20 parts of polyvinyl alcohol with a degree of polymerization of 1500, dissolve it in 80 parts of distilled water at 85°C, stir evenly, and keep it in a constant temperature water bath at 80°C for 10 hours. Mix zirconia powder raw materials, binder, paraffin, and glycerin in a mass ratio of 100:65:5:4, and use a vacuum mixer to mix and knead the mud until the zirconia plastic mud ball is obtained, and put the mud ball in a sealed state Aging 20h.

[0028] Put the zirconia plastic clay ball into the vacuum extrud...

Embodiment 3

[0031] The selected primary grain size is 5-30nm, and the contents of 12 impurity elements such as Fe, Mn, Mg, Pb, Ti, W, Cr, Co, V, Mo, As, Ni are 7ppm, 6ppm, 10ppm, 7ppm, 10ppm respectively , 8ppm, 8ppm, 9ppm, 7ppm, 7ppm, 2ppm, 7ppm high-purity nano-zirconia powder is made by spraying and granulating process, the main particle size distribution range is 0.4-11.5μm, and the average particle size is d 50 =2.446μm spherical zirconia powder raw material.

[0032] Take 10 parts of polyvinyl alcohol with a degree of polymerization of 1800, dissolve it in 90 parts of distilled water at 85°C, stir evenly, and keep it in a constant temperature water bath at 90°C for 6 hours. Mix zirconia powder raw materials, binder, paraffin, and glycerin in a mass ratio of 100:50:10:6, and use a vacuum mixer to mix and knead the mud until the zirconia plastic mud ball is obtained, and put the mud ball in a sealed state Aging 20h.

[0033] Put the zirconia plastic clay ball into the vacuum extrude...

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Abstract

The invention discloses a preparation method of a high-purity fine-grained zirconia ceramic bar for flame spraying, belonging to the technical field of material surface protection. The method comprises the following steps: (1) carrying out spray granulation on high-purity nano zirconia powder to obtain spherical zirconia powder raw material; (2) dissolving polyvinyl alcohol in distilled water, adding a stabilizer, and stirring uniformly to obtain a polyvinyl alcohol aqueous solution binder; (3) adding the spherical zirconia powder raw material into the polyvinyl alcohol aqueous solution binder, adding a lubricant and a plasticizer, and mixing by using a vacuum mixer for pugging; (4) placing zirconia mud pellets into a vacuum extruder, and extruding for molding to obtain a green body; (5) sequentially removing water and organic matters from the green body to obtain a mature blank body; (6) sintering the mature blank body to obtain the zirconia ceramic bar. The high-purity fine-grained zirconia ceramic bar prepared by the method is low in impurity element content and small in grain size, and can be used for preparation of a zirconia coating on the surface of a graphite crucible or anextrusion die.

Description

technical field [0001] The invention belongs to the technical field of material surface protection, and relates to a method for preparing a high-purity, fine-grain zirconia ceramic rod for flame spraying. Background technique [0002] Graphite crucibles and graphite extrusion dies for special smelting have extremely high requirements for the preparation of zirconia protective coatings on their surfaces. First of all, since the zirconia coating is in direct contact with the smelted metal, in order to prevent impurity elements from entering the smelting metal, the zirconia coating must have an extremely low content of impurity elements; secondly, in order to ensure that the zirconia coating prepared by spraying has excellent Microstructure uniformity, the zirconia rods used for spraying must have fine and fusible grains, in order to ensure that the rods do not break during flame spraying, the zirconia rods used must also have suitable density and flexural strength . The zirc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/48C04B35/626
CPCC04B35/48C04B35/62695C04B2235/6562C04B2235/6567C04B2235/96
Inventor 于月光黄凌峰刘建明沈婕彭浩然侯伟骜冀晓鹃酉琪
Owner BEIJING MINING & METALLURGICAL TECH GRP CO LTD
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