Process for production of aluminum titanate-based ceramics

A technology of aluminum titanate and ceramics, applied in titanate, chemical instruments and methods, titanium compounds, etc., can solve problems such as waste

Inactive Publication Date: 2010-12-08
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The removed particulate aluminum titanate-based ceramics cannot be directly used for molding and are all wasted

Method used

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Examples

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preparation example Construction

[0014] The particulate aluminum titanate-based ceramics suitable for the production method of the present invention is a fine powder of aluminum titanate-based ceramics. The maximum particle size is usually 60 μm or less, preferably 40 μm or less, and the particle size (D10) corresponding to a cumulative percentage of 10% on a mass basis is usually 0.1 μm or more, preferably 0.5 μm or more. It is further preferable to use a fine powder having a D50 value of 20 μm or less and a D90 value of 40 μm or less.

[0015] Composition of particulate aluminum titanate-based ceramics, converted to titanium dioxide [TiO 2 ], alumina [Al 2 o 3 ] and the results of other metal-containing oxides to determine. The titanium content in terms of titania is generally 20 parts by mass in terms of titanium dioxide- 60 parts by mass, and the aluminum content in terms of alumina is 30 parts by mass to 70 parts by mass. Preferably, the titanium content in terms of titanium dioxide is 30 to 50 part...

Embodiment 1

[0088] As particulate aluminum titanate-based ceramics, magnesium aluminum titanate was crushed and passed through a sieve with a mesh size of 33 μm to obtain a particle size with a maximum particle size of 33 μm, a central particle size (D50) of 16.3 μm, and a cumulative percentage of 90% ( D90) is 29.1 μm aluminum magnesium titanate powder [the composition is TiO 2 : 39% by mass, Al 2 o 3 : 56% by mass, MgO: 1.4% by mass] 5 g. This aluminum magnesium titanate powder was mixed with 17.6 g of titanium (IV) oxide powder [DuPont, "R-900"], 24.3 g of α-alumina powder [Sumitomo Chemical Co., Ltd., "AES-12"], 1.4 g Magnesium carbonate powder of g [Kamijima Chemical Co., Ltd., "Jinxing"], 1.6 g of powdered feldspar [obtained by Special Concentrate Co., Ltd., model "SS-300", according to SiO 2 The converted silicon content is 67.1% by mass in terms of Al 2 o 3 The converted aluminum content was 18.1% by mass] and 5 kg of alumina beads [diameter 15 mm] were put into an alumina pu...

Embodiment 2

[0091] As particulate aluminum titanate-based ceramics, aluminum titanate was crushed and passed through a sieve with a mesh size of 33 μm to obtain a particle size with a maximum particle size of 33 μm, a central particle size (D50) of 16.3 μm, and a particle size corresponding to a cumulative percentage of 90% ( D90) is 29.1 μm aluminum titanate powder [composition is TiO 2 : 39% by mass, Al 2 o 3 : 56% by mass, MgO: 1.4% by mass] 2000g. The particulate aluminum titanate-based ceramics were mixed with 3193g of titanium oxide powder [DuPont, "R-900"], 4393g of α-alumina powder [primary particle size 4 μm, secondary particle size 80 μm], 124 g of magnesium oxide powder [Ube Material, "UC-95M"], and 291g of powdered feldspar [large flat feldspar obtained from Special Concentrate Co., Ltd., model "SS-300"] and 80kg of alumina beads [diameter 15mm] were put into the Alumina crushing container [inner volume 50L]. The total volume of the mixture of titanium oxide powder, alpha ...

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Abstract

The invention aims to make effective use of fine particles of an aluminum titanate-based ceramic and thus produce an aluminum titanate-based ceramic which has a small BET specific surface area and which exhibits a small pore volume when disintegrated into powder. A process for production of aluminum titanate -based ceramics which comprises firing either a precursor mixture obtained by mixing fine particles of an aluminum titanate-based ceramic with a titania source, an alumina source and, if necessary, a magnesia source and / or a silica source or a powder composed of fine particles of an aluminum titanate-based ceramic in itself in a powdery or formed state, preferably in a formed state.

Description

technical field [0001] The invention relates to aluminum titanate series ceramics represented by aluminum titanate or aluminum magnesium titanate and a preparation method thereof. In particular, the present invention relates to a method for producing aluminum titanate-based ceramics in which fine particles of aluminum titanate-based ceramics that have been conventionally classified and removed after sintering are re-sintered to make effective use of them. Background technique [0002] Aluminum titanate-based ceramics are known as ceramics excellent in heat resistance. For example, Patent Document 1 (WO2005 / 105704 A) discloses a method of mixing a powdery titanium dioxide source with an alumina source and the like, and sintering the obtained premix. Aluminum titanate-based ceramics obtained by such a method are generally in the form of a block, and can be made into a powder by crushing it. The obtained aluminum titanate-based ceramic powder can be molded into a molded body ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/00C04B35/443C04B35/46
CPCC04B2235/3418C04B2235/81C04B2235/5409C04B2235/3206C04B35/478C04B2235/36C04B35/62615C04B2235/3232C04B35/6269C04B2235/3217C01P2004/61C04B2235/5481C04B2235/3472C01P2006/12C01P2006/14C01G23/003C01P2002/72C04B2235/6562C01P2004/12C04B2235/5436C04B35/6262C04B2235/3234
Inventor 真木一当间哲朗鸣海雅之
Owner SUMITOMO CHEM CO LTD
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