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Process for producing an oxide

A manufacturing method and oxide technology, which is applied in the direction of oxide/hydroxide preparation, alkaline earth metal aluminate/alumina/aluminum hydroxide preparation, discharge tube/lamp parts, etc., which can solve the problem of long reaction time, Problems such as high-priced equipment and complex reaction condition control achieve the effect of long reaction time

Active Publication Date: 2011-08-31
ASAHI GLASS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in the past, conductive mayenite-type compounds were obtained by first holding at 1300°C for 6 hours to produce crystal powder with only the C12A7 structure, and then performing a reduction treatment. Therefore, expensive equipment, complicated reaction condition control, and long reaction times were required. Time (refer to Patent Document 2)

Method used

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Examples

Experimental program
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Effect test

example 1

[0068] After mixing 62.7g of calcium carbonate and 37.3g of alumina in a molar ratio of calcium oxide and alumina in terms of oxides of 12:7, the temperature was raised to 1100°C at a rate of 300°C / hour in air and kept 2 hours. The temperature was lowered to room temperature at a cooling rate of 300° C. / hour. As a result, sintering by solid phase reaction hardly proceeded, and 72 g of agglomerated powder was obtained.

[0069] The aggregated powder has an average particle diameter of 100 μm or less, and can be easily crushed using an automatic grinder to obtain calcined powder. The resulting calcined powder was studied using X-ray diffraction and found to be a mixture of calcium aluminate, calcium oxide and alumina. The average particle diameter of the calcined powder was measured using a laser diffraction scattering method (SALD-2100, manufactured by Shimadzu Corporation), and the average particle diameter was 20 μm.

[0070] Put 3 g of the obtained calcined powder in a car...

example 2

[0072] An oxide was produced in the same manner as in Example 1 except that the calcined powder was kept at 1250° C. for 2 hours. The oxide is a C12A7 single phase, and the electron density of the oxide is 5.0×10 18 / cm 3 , the conductivity is 0.2S / cm.

example 3

[0074] An oxide was produced in the same manner as in Example 1 except that the calcined powder was held at 1400° C. for 2 hours. The oxide is a C12A7 single phase, and the electron density of the oxide is 6×10 19 / cm 3 , the conductivity is 5.3S / cm.

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Abstract

Provided is a process for producing an oxide which includes an electrically conductive mayenite type compound and has an electron density of at least 1 * 1018 / cm3, starting from a combination of a calcium compound and aluminium compound, or a compound which includes calcium and aluminium with a molar ratio of calcium oxide and aluminium oxide as equivlent oxides in the range 9:10 to 14:5, wherein the process for producing an oxide includes a step of heating and holding the starting material at 900-1300 DEG C to produce a calcined powder which includes at least one oxide selected from a group comprising calcium aluminate, calcium oxide and aluminium oxide, and a step of heating and holding the aforementioned calcined powder at least 1200 DEG C and less than 1415 DEG C, in a reducing atmosphere in an atmosphere of an inert gas with a partial pressure of oxygen of no more than 1000 Pa or in a vacuum atmosphere.

Description

technical field [0001] The present invention relates to a method for producing an oxide containing a conductive mayenite-type compound. Background technique [0002] The mayenite type compound is a compound with 12CaO·7Al 2 o 3 (hereinafter also referred to as "C12A7") has a characteristic crystal structure of three-dimensionally connected voids (cages) with a diameter of about 0.4 nm. The framework that makes up the cage is positively charged, and each unit cell forms 12 cages. 1 / 6 of this cage satisfies the electroneutral condition of the crystal and is therefore occupied by oxygen ions, but this oxygen ion has chemically different properties from the other oxygen ions making up the framework, so it is specifically called "free oxygen ion". Therefore, the C12A7 crystal is also recorded as [Ca 24 Al 28 o 64 ] 4+ 2O 2- (Refer to Non-Patent Document 1). [0003] C12A7 crystal powder or its sintered body can be given permanent conductivity at room temperature by heat-...

Claims

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Application Information

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IPC IPC(8): C01F7/16H01J1/30H01J1/304C01F7/164
CPCC01F7/164C01P2006/40C01P2004/61C01B13/18C01F7/16
Inventor 伊藤和弘渡边晓渡边一成伊藤节郎
Owner ASAHI GLASS CO LTD
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