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Method for preparing aluminum oxide ceramic sphere without fingernail line defect

A nail grain defect and alumina technology, which is applied in the field of alumina ceramic ball preparation, can solve the problems that nail grain defects cannot be improved, cannot meet the production requirements of large-sized alumina ceramic balls, and are difficult to completely eliminate, so as to meet the requirements of improving product performance , meet the molding requirements, reduce shrinkage and loss on fire

Inactive Publication Date: 2015-09-16
JINGANG NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, it is difficult to completely eliminate the large-size products of semi-isostatic or isostatic pressed alumina ceramic balls, and it is rare in roll-formed alumina ceramic balls
[0005] At present, there is more and more demand for alumina ceramic balls with a diameter of more than 35mm in the market, but roll forming cannot meet the production requirements of large-sized alumina ceramic balls (especially with a diameter of more than 50mm) technically, so dry balls can only be used. compression molding
Practice has proved that the use of extensive traditional production processes cannot improve or eliminate the nail pattern defects in large-sized alumina ceramic balls formed by dry pressing

Method used

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  • Method for preparing aluminum oxide ceramic sphere without fingernail line defect
  • Method for preparing aluminum oxide ceramic sphere without fingernail line defect
  • Method for preparing aluminum oxide ceramic sphere without fingernail line defect

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] (1) Raw materials and parts by weight

[0044] Main ingredients: 90 parts of α-alumina powder, 5 parts of kaolin, 3 parts of burnt gemstone;

[0045] Composite sintering aid: 0.5 part of heavy calcium, 0.5 part of talc, 1 part of dolomite;

[0046] (2) Put the α-alumina powder into the cylinder with a length of 7.48m and a cylinder diameter of 1.5m. The alumina ball is used as the grinding medium, and the material: ball = 1:2.8 in a continuous ball mill. After dry grinding for 5 hours, air selection is used Classify by machine, select α-alumina powder with a particle size of D90=3-6 microns, heat it up to 1350°C at a constant speed of 35°C in a tunnel kiln for calcination, and keep it for 1h;

[0047] (3) Weigh kaolin, coke gemstones and composite sintering aids according to the formula weight, respectively put them into a ball mill with external dimensions of 3000*4500mm and a speed of 13r / min for wet ball milling for 15h, slurry fineness D90=15μm, pass 180 Mesh siev...

Embodiment 2

[0054] (1) Raw materials and parts by weight

[0055] Main ingredients: 90 parts of α-alumina powder, 5 parts of kaolin, 3 parts of burnt gemstone;

[0056] Composite sintering aid: 0.5 part of heavy calcium, 0.5 part of talc, 1 part of dolomite;

[0057] (2) Put the α-alumina powder into the cylinder with a length of 7.48m and a diameter of 1.5m. The alumina ball is used as the grinding medium. After 8 hours of dry grinding in a continuous ball mill with ball = 1:2.8, air selection is used Classify by machine, select α-alumina powder with a particle size of D90=3-6 microns, heat it up to 1340°C at a constant speed of 35°C in a tunnel kiln for calcination, and keep it for 2 hours;

[0058] (3) Weigh kaolin, coke gemstones and composite sintering aids according to the formula weight, respectively put them into a ball mill with external dimensions of 3000*4500mm and a speed of 13r / min for wet ball milling for 18h, slurry fineness D90=10μm, pass 180 Mesh sieve, put it into the ...

Embodiment 3

[0065] (1) Raw materials and parts by weight

[0066] Main ingredients: 90 parts of α-alumina powder, 5 parts of kaolin, 3 parts of burnt gemstone;

[0067] Composite sintering aid: 1 part of heavy calcium, 0.5 part of talc, 0.5 part of dolomite;

[0068] (2) Put the α-alumina powder into a cylinder with a length of 7.48m and a diameter of 1.5m. Alumina balls are used as the grinding medium. After dry grinding for 7 hours in a continuous ball mill with balls = 1:2.8, air selection is used Classify by machine, select α-alumina powder with a particle size of D90=3-6 microns, heat it up to 1325°C at a constant speed of 35°C in a tunnel kiln for calcination, and keep it for 3 hours;

[0069] (3) Weigh kaolin, coke gemstones and composite sintering aids according to the formula weight, respectively put them into a ball mill with external dimensions of 3000*4500mm and a speed of 13r / min for wet ball milling for 17h, slurry fineness D90=11μm, pass 180 Mesh sieve, put it into the tr...

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Abstract

The invention discloses a method for preparing aluminum oxide ceramic spheres without fingernail line defect. The method comprises the following steps: performing dry grinding and air separation on alpha-aluminum oxide powder, and reburning alpha-aluminum oxide powder with D90 of 3-6 micrometers; carrying out wet grinding, powdering and calcining other assistant materials; mixing the treated main material and assistant materials, performing wet grinding, and powdering; separating the pelleting powder with a sieve of 300 meshes so as to obtain pelleting power A and pelleting powder B; adding additives into the pelleting powder B so as to obtain pelleting powder C; mixing the pelleting powder A and the pelleting powder C in different ratios according to sizes of half-finished products, and performing compression molding; performing firing molding by using different firing processes according to the sizes of the half-finished products. By adopting the method, the aluminum oxide ceramic sphere production process can be comprehensively improved in multiple ways and aspects, and the purposes of reducing or eliminating fingernail line defect of aluminum oxide ceramic spheres can be achieved.

Description

technical field [0001] The invention relates to a method for preparing alumina ceramic balls, in particular to a method for producing large-sized dry-pressed alumina ceramic balls without nail-mark defects. Background technique [0002] Alumina ceramic balls are widely used as grinding media for materials. At present, the alumina ceramic balls produced at home and abroad are mainly made of α-alumina powder through multiple processes such as batching, ball milling, molding and high-temperature firing. [0003] The JCT848.1-2010 standard puts forward technical requirements for the appearance quality and physical and chemical properties of alumina ceramic balls, and classifies various defects that may appear in alumina ceramic balls, but does not involve nail grain defects. Fingerprint defects refer to discontinuous and curved cracks distributed on the surface or inside of ceramic balls (see attached Figure 2-3 ). Nail marks cannot be detected in semi-finished products, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/10C04B35/622
Inventor 曾华生王晋槐王琦赵友谊李丹丹甘珊珊焦广磊孙怀亮栾斌
Owner JINGANG NEW MATERIALS
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