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Method for producing granules for ceramic production

A manufacturing method and particle technology, which is applied in the direction of manufacturing tools, ceramic molding machines, and liquid separation into beads and granules, which can solve the problems of increased micropowder and reduced particle yield, and achieve the effect of increased yield

Pending Publication Date: 2021-02-12
TOKUYAMA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In particular, if it is necessary to produce particles with a particle size of 100 μm or less, the amount of its fine powder will increase relatively, and there will be a problem that the yield of the obtained particles will decrease, and improvement is required.

Method used

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  • Method for producing granules for ceramic production
  • Method for producing granules for ceramic production

Examples

Experimental program
Comparison scheme
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Embodiment

[0072] In order to demonstrate this invention more concretely, although an Example and a comparative example are given below, this invention is not limited to these Examples.

[0073] In addition, the measurement of various physical properties in the following Examples and Comparative Examples was performed by the following method.

[0074] (1) Average particle size of aluminum nitride powder

[0075] The average particle size of aluminum oxide powder, aluminum nitride powder, and mixed powder of aluminum nitride and unreacted raw material alumina was obtained by dispersing the sample in an aqueous solution of sodium pyrophosphate with a homogenizer, using MICROTRAC HRA manufactured by Nikkiso Co., Ltd. determined by laser diffraction.

[0076] (2) specific surface area

[0077] The specific surface area of ​​the aluminum nitride powder was measured by the BET method using Flow Sorb2300, a flow type surface area automatic measuring device manufactured by Shimadzu Corporation...

Embodiment 2

[0102] Granulation was performed in the same manner as in Example 1, except that the rotational speed of the atomizer was set to 8000 rpm in Example 1. After the granulation finishes, the granules (micropowder) collected by the cyclone separator in the 88kg of granules collected under the spray drier and the 35kg granulation are introduced into the flow dryer, and carried out 2 hours of fluidization treatment at room temperature, Make aluminum nitride particles.

[0103]

[0104] Granulation was performed in the same manner as in Example 1, except that the interior of the cyclone was made of stainless steel which was not coated with alumina ceramics in Example 1. After the granulation is finished, 101kg of particles (granules) collected under the spray dryer and 24kg of particles (fine powder) collected by the cyclone separator in the granulation are introduced into the flow dryer, and flow treatment is carried out for 2 hours at room temperature to produce Aluminum nitride...

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Abstract

The purpose of the present invention is to provide a method for producing granules for ceramic production, the method having high productivity and making it possible to obtain a ceramic in which decreases in physical properties are suppressed when producing a ceramic by supplying granules for press molding and firing the resultant press molded article. The present invention is characterized by including: a slurry preparation step for preparing a slurry comprising a mixture that includes a powder of an inorganic compound, a binder, and a solvent; a granulation step for introducing the slurry into a spray drying apparatus to form granules containing the inorganic compound; an exhaust step for exhausting the atmospheric gas in the spray drying apparatus through a cyclone having a surface madeof ceramic; and a step for mixing the fine powder collected in the cyclone during the exhaust step with the granules obtained in the granulation step.

Description

technical field [0001] The present invention relates to a method for producing particles for ceramic production comprising an inorganic compound, such as aluminum nitride, as particles for sintering. Background technique [0002] Inorganic materials represented by aluminum nitride are formed by spray-drying a slurry containing a solvent and, if necessary, a binder, etc., into a granular form, and firing it into a solidified sintered body, that is, ceramics. The above-mentioned ceramics can be used for various purposes. For example, ceramics made of aluminum nitride exhibit high thermal conductivity and high insulation properties, and are widely used as heat dissipation materials and electrical insulation materials in applications such as heat dissipation substrates of electrical equipment and electronic circuit substrates (Patent Documents 1 and 2). [0003] In particular, the granular molded body as described above is suitable for molding into a predetermined shape by pres...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/626C04B35/581
CPCC04B35/581C04B35/62695C04B35/62655C04B35/62635C04B35/638C04B35/64C04B35/632C04B35/63424C04B2235/6567C04B2235/725C04B2235/608C04B2235/5436C04B2235/5409C04B2235/3225C04B2235/77C04B2235/721C04B2235/723C04B2235/604C04B2235/658B01D1/18B01J2/02B28B3/02C04B35/62625B01J2/04
Inventor 藤本宗宽池田刚
Owner TOKUYAMA CORP