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Method for preparing large-size ceramic grinding ball and mould

A large-size, grinding ball technology, applied in the field of grinding media, to achieve the effects of reducing production costs, shortening production cycles, and low one-time investment

Inactive Publication Date: 2008-11-12
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of this method is that it can only form millimeter-sized or even smaller ceramic balls.

Method used

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  • Method for preparing large-size ceramic grinding ball and mould

Examples

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Embodiment 1

[0032] Embodiment 1: Zirconia ceramic grinding ball

[0033] In the present embodiment, the mold that adopts is graphite mold, and its structure is as follows figure 1 As shown in , each mold has 16 spherical cavities.

[0034] The raw material is commercially available 8% yttria-stabilized zirconia powder (purity>99%), with an average particle size of 0.5 microns. Prepare 1000ml premixed solution, the mass ratio is: 10% acrylamide; 1% N,N'-methylenebisacrylamide; 2% ammonium polyacrylate; 87% deionized water.

[0035] Prepare a slurry with a mass solid content of 80%, and ball mill and mix for 2 hours.

[0036] Add the catalyst tetramethylethylenediamine and the initiator ammonium persulfate respectively, the addition amount is 0.2% of the mass of the above slurry, and after vacuum stirring and degassing for 15 minutes, inject the slurry from the gate of the mold, when the slurry Until it comes out of the riser, the mold is then transferred to an oven preheated to 80°C and...

Embodiment 2

[0039] Embodiment 2: alumina ceramic grinding ball

[0040] In this embodiment, the mold used is a plastic mold, and its structure is as follows figure 1 As shown in , each mold has 16 spherical cavities.

[0041] The raw material is commercially available α-alumina (purity>99.5%) with an average particle size of 1 micron. Prepare 1000ml premixed solution, the mass ratio is: 9% acrylamide; 0.45% N,N'-methylenebisacrylamide; 0.55% ammonium polyacrylate; 90% deionized water.

[0042] Prepare a slurry with a mass solid content of 70%, and ball mill and mix for 5 hours.

[0043] Add the catalyst tetramethylethylenediamine and the initiator ammonium persulfate respectively, the addition amount is 0.15% of the above-mentioned slurry mass, and after vacuum stirring and degassing for 20 minutes, inject the slurry from the gate of the mold, when the slurry Until it emerges from the riser, the mold is then transferred to an oven preheated to 70°C for 20 minutes. The mold is placed a...

Embodiment 3

[0046] Embodiment 3: silicon nitride ceramic grinding ball

[0047] In this embodiment, the mold used is an aluminum alloy mold, and its structure is as follows figure 1 As shown in , each mold has 16 spherical cavities.

[0048] The raw material is commercially available silicon powder (purity > 99%), the particle size distribution is 1-30 micron, and the average particle size is 10 micron, with 4% aluminum oxide and 1% yttrium oxide as sintering aid (the ratio of sintering aid is the mass ratio relative to the silicon powder). Prepare 1000ml premixed solution, the mass ratio is: 12% acrylamide; 0.6% N,N'-methylenebisacrylamide; 1% ammonium citrate; 86.4% deionized water.

[0049] Prepare a slurry with a mass solid content of 60%, and ball mill and mix for 3 hours.

[0050] Add the catalyst tetramethylethylenediamine and the initiator ammonium persulfate respectively, and the addition amount is 0.1% of the above-mentioned slurry mass, and after vacuum stirring and degassin...

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Abstract

The invention provides a method for preparing a large size ceramic grinding ball and a mould for shaping the same, which belongs to the grinding media technical field. The method is as follows: firstly, monomer solution for gel-casting is prepared, added with ceramic powder to form a stable slurry with uniform stirring; catalyst and initiator are added to slurry with vacuum mixing; secondly, the slurry is cast in the mould, and is kept in a temperature till the complete reaction between the monomer and crosslinking agent to get a green ceramic grinding ball; finally, the green ceramic grinding ball is dried and sintered to obtain the ceramic grinding ball. The mould for shaping consists of upper and lower semi-norms of the same size, which are mismatched and provided with a plurality of hemispherical mode cavities. The ceramic grinding ball has the advantages of high strength, hardness, wear resistance, corrosion resistance and temperature stability; and the size of which can be controlled by that of the spherical mode cavity of the mould. The method is low in cost, easy for industrialization, and is especially suitable for a shaped large size ceramic grinding ball.

Description

technical field [0001] The invention relates to a method and a mold in the technical field of grinding media, in particular to a method for preparing large-size ceramic grinding balls and a molding mold. Background technique [0002] Ceramic grinding balls are widely used as grinding media in ceramics, electronics, building materials, iron and steel metallurgy and other related fields because of their excellent characteristics such as high hardness, high strength, high temperature resistance, wear resistance and corrosion resistance. The existing ceramic balls used as grinding media are mainly prepared by two processes. One of the processes is the cold isostatic pressing process. Although this process can form high-quality ceramic balls, the disadvantages are high requirements for equipment costs and relatively short production cycles. Long, low cost performance; the second process is the rolling ball forming process, generally the ultrafine powder raw material slurry is ext...

Claims

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Application Information

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IPC IPC(8): C04B35/622B28B7/24
Inventor 李飞骆兵何博周洪孙宝德
Owner SHANGHAI JIAO TONG UNIV
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