Method for producing aluminum titanate ceramic

A technology of aluminum titanate and ceramics, applied in the field of dry preparation of aluminum titanate ceramics, can solve the problem of taking a long time

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

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Problems solved by technology

[0004] However, in such a conventional production method, there is a problem that it takes a long time to sinter the premix to obtain aluminum titanate ceramics.

Method used

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  • Method for producing aluminum titanate ceramic

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[0028] In the production method of the present invention, such titanium dioxide source powder and alumina source powder are used as raw material powders. These raw material powders are mixed and dry pulverized to obtain a premix. Alternatively, a titanium dioxide source powder, an alumina source powder, and a magnesia source powder may be mixed together and dry pulverized to obtain a premix.

[0029] As a magnesium oxide source powder, the powder of magnesium oxide (magnesia) is mentioned, for example.

[0030] The magnesia source powder may also contain a compound capable of forming magnesia by sintering alone in air. Examples of such compounds include magnesium salts, magnesium alkoxides, magnesium hydroxide, magnesium nitride, and metallic magnesium.

[0031] Specific examples of magnesium salts include magnesium chloride, magnesium perchlorate, magnesium phosphate, magnesium pyrophosphate, magnesium oxalate, magnesium nitrate, magnesium carbonate, magnesium acetate, magn...

Embodiment 1

[0075] 19.6 g of titanium oxide powder [DuPont, "R-900"], 27.0 g of α-alumina powder [Sumitomo Chemical Co., Ltd., "AES-12"], 1.6 g of magnesium carbonate powder [Kamishima Chemical ( Co., Ltd., "Jinxing"] and 1.8g of powdered feldspar [large flat feldspar obtained from Special Concentrate Co., Ltd., model SS-300], and 5kg of alumina beads [diameter 15mm] were put into the alumina production line Crushing container [inner volume 3.3L]. The total volume of the mixture of titanium oxide powder, alpha alumina powder and feldspar is about 50 cm 3 . Afterwards, using a vibrating mill, the crushing container was vibrated for 2 minutes under the conditions of amplitude 5.4mm, vibration frequency 1760 times / min [equivalent to acceleration 10G], and power 5.4kW, thereby pulverizing the mixture in the crushing container to obtain a premix . 5 g of this pre-mixture was put into an alumina crucible, and the temperature was raised to 1450° C. at a heating rate of 300° C. / hour in an elec...

Embodiment 2

[0079] In addition to the use of titanium oxide powder [R-900] of 23.0g, α-alumina powder [AES-12] of 19.6g, magnesium carbonate powder [Venus] of 4.0g, feldspar [SS- 300] was used in an amount of 3.3g, and all the others were operated in the same manner as in Example 1 to obtain a sintered product and powder. The obtained powder showed an X-ray diffraction peak of aluminum magnesium titanate, and its AT rate was 100%. In addition, in this powder, almost all the particles constituting the powder are as large as spherical.

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Abstract

Disclosed is a method for producing an aluminum titanate ceramic by firing, for a shorter time, a precursor mixture which is obtained by mixing a titania source powder, an alumina source powder and a magnesia source powder. Specifically disclosed is a method for producing an aluminum titanate ceramic, which is characterized in that a precursor mixture is obtained by mixing a titania source powder and an alumina source powder and dry-grinding the mixed powders with an acceleration of not less than 2G in the co-presence of grinding media, and then the thus-obtained precursor mixture is fired. The titania source powder and the alumina source powder may be mixed together with a magnesia source powder or a silica source powder. The mixed powders are preferably ground by a vibration mill. An aluminum titanate ceramic powder can be produced by crushing the aluminum titanate ceramic which is obtained by the above-described production method.

Description

technical field [0001] The invention relates to a preparation method of aluminum titanate ceramics, in particular to a dry method for preparing aluminum titanate ceramics. Background technique [0002] As is well known, aluminum titanate ceramics are ceramics obtained by sintering titanium source powder and alumina source powder and are excellent in heat resistance. For example, in Non-Patent Document 1 (Key Engineering Materials Vol. 336-338 (2007) P1327-1330), it is disclosed that the titanium dioxide source powder and the alumina source powder are pulverized in a state dispersed in water, and evaporated to dry solids to remove the A method of sintering the obtained premix after the moisture is obtained into a powdery premix. [0003] In addition, Patent Document 1 (WO2005 / 105704 A) discloses that the titanium dioxide source powder and the alumina source powder are pulverized in the presence of various additives consisting of a small amount of organic components, and the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/46
CPCC04B2235/81C04B2235/3418C04B2235/3206C04B38/00C04B2235/36C04B35/62615C04B35/478C04B2111/0081C04B2235/3472C04B2111/00844C04B2235/80C04B2111/00793C04B2235/6562C04B2111/0087C04B38/067C04B38/0675C04B38/068
Inventor 真木一当间哲朗铃木敬一郎
Owner SUMITOMO CHEM CO LTD
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