TOP > 外国特許検索 > METHOD FOR PRODUCING α-ALUMINUM OXIDE PARTICLE, AND α-ALUMINUM OXIDE PARTICLE

METHOD FOR PRODUCING α-ALUMINUM OXIDE PARTICLE, AND α-ALUMINUM OXIDE PARTICLE NEW コモンズ 新技術説明会

外国特許コード F190009789
整理番号 (GI-H29-03,S2017-1028-N0)
掲載日 2019年5月7日
出願国 世界知的所有権機関(WIPO)
国際出願番号 2018JP030058
国際公開番号 WO 2019039321
国際出願日 平成30年8月10日(2018.8.10)
国際公開日 平成31年2月28日(2019.2.28)
優先権データ
  • 特願2017-161397 (2017.8.24) JP
発明の名称 (英語) METHOD FOR PRODUCING α-ALUMINUM OXIDE PARTICLE, AND α-ALUMINUM OXIDE PARTICLE NEW コモンズ 新技術説明会
発明の概要(英語) Provided are: a method for producing an α-aluminum oxide particle, whereby a particle having a smaller particle size and high dispersibility can be produced with high purity; and an α-aluminum oxide particle produced by the production method. An α-aluminum oxide particle having a Feret diameter of at least 2 nm and less than 20 nm and a circularity of 0.82-0.86 is produced by a production method in which amorphous aluminum hydroxide, water, and carboxylic acid are mixed and stirred to prepare a precursor sol of α-aluminum oxide, and the undried precursor sol or a dried matter of the precursor sol is rapidly heated for 0.1-60 seconds from room temperature to a temperature range of 1000-1200°C, and the rapidly heated matter is rapidly cooled for 1 second to 10 minutes from the temperature range of 1000-1200°C to a temperature range of room temperature to 100°C.
従来技術、競合技術の概要(英語) BACKGROUND ART
Α - (α - alumina, corundum) is aluminum oxide, a high hardness, electrical insulation, chemical stability, mechanical strength and good balance of properties, a high number of the sub material constituted by an element because, as the ceramic material can be relatively inexpensive and easily available from the, a very widely used in industry is one of a ceramic material.
Is a general method for manufacturing the aluminum oxide of the α -, gibbsite, bayerite, nordstrandite such as aluminum hydroxide, boehmite (AlO (OH) ) by heating, γ - alumina, δ - alumina, η - alumina, κ - alumina, ρ - alumina, an intermediate alumina such as alumina through χ -, α - is generated in the aluminum oxide. In this way via the intermediate aluminum oxide in order to generate the α -, and firing conditions are determined by the difference between the starting material, generation of the various routes are known. However, it may be generated through a route, in order to generate the α - aluminum oxide, about 1300°C or more in the prior art has been fired at high temperature. Such a high temperature when firing for a long time, the crystals of aluminum oxide generated by the α -, polymer growth through more than 1μm and particle size are known.
On the other hand, bond with the particles of the ceramics becomes, the larger particles having a particle diameter is not the appearance of a characteristic, the intermediate layer of the isolation film or a translucent material such as new applications are created from, conventionally, a finer particles have been attempted. As described above is widely used in the industry for α - aluminum oxide, it is required that the finer particles and, using various manufacturing methods have been tried.
For example, 60°C or less of the hydrolysis of the aluminum hydrolysates dispersed seed crystal, 950°C or less by heating, necking of the particles are small in the method of producing the aluminum oxide has been proposed (see Patent Document 1). However, Patent Document 1 is an aluminum oxide obtained by the method of the α -, primary particles of 50nm or more is grown on, strongly aggregated and the aggregate of 200nm or more. (Low dispersion) and strong aggregation, even if the primary particles as small, the characteristics of the fine particles does not exhibit bring.
In addition, an aluminum alkoxide as a raw material by a sol-gel method in the case of producing α - aluminum oxide, by adding a surfactant, 20nm-30nm of particles has been reported (Non-Patent Document 1). However, in the technique of Non-Patent Document 1, sodium dodecyl benzene sulfonate (SDBS) surfactant such as bis (2-ethylhexyl) sodium sulfosuccinate (Na (AOT) ) was used, after firing of the aluminum oxide remains as an impurity element other than constituent elements. In particular, alkali metal such as sodium, the ceramic at a high temperature greatly affects the characteristics.
  • 出願人(英語)
  • ※2012年7月以前掲載分については米国以外のすべての指定国
  • GIFU UNIVERSITY
  • 発明者(英語)
  • YOSHIDA Michiyuki
  • SAKURADA Osamu
国際特許分類(IPC)
指定国 National States: AE AG AL AM AO AT AU AZ BA BB BG BH BN BR BW BY BZ CA CH CL CN CO CR CU CZ DE DJ DK DM DO DZ EC EE EG ES FI GB GD GE GH GM GT HN HR HU ID IL IN IR IS JO JP KE KG KH KN KP KR KW KZ LA LC LK LR LS LU LY MA MD ME MG MK MN MW MX MY MZ NA NG NI NO NZ OM PA PE PG PH PL PT QA RO RS RU RW SA SC SD SE SG SK SL SM ST SV SY TH TJ TM TN TR TT TZ UA UG US UZ VC VN ZA ZM ZW
ARIPO: BW GH GM KE LR LS MW MZ NA RW SD SL SZ TZ UG ZM ZW
EAPO: AM AZ BY KG KZ RU TJ TM
EPO: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
OAPI: BF BJ CF CG CI CM GA GN GQ GW KM ML MR NE SN ST TD TG
岐阜大学産官学連携推進本部では、岐阜大学における知的財産の創出・管理・活用のマネジメントをしています。上記の特許・技術に関心のある方は、下記問い合わせ先に整理番号とともにご相談下さい。

PAGE TOP

close
close
close
close
close
close