Mayenite-type compound and process for production of same

A technology of mayenite and compounds, which is applied in the field of mayenite-type compounds and its manufacture, can solve the problems of difficult long-term storage, deterioration of secondary electron emission coefficient and other characteristics, achieve chemical stability, excellent oxidation resistance, high productivity effect

Inactive Publication Date: 2011-07-20
ASAHI GLASS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, C12A7 electronic compounds are difficult to preserve in the air for a long time
In addition, if heat treatment is performed when used in PDP, etc., the

Method used

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  • Mayenite-type compound and process for production of same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0119] Powdered calcium carbonate (CaCO 3 ), magnesium oxide (MgO) and aluminum oxide (Al 2 o 3 ) were mixed at a molar ratio of 11.1:0.9:7 (=12(1-0.075):12×0.075:7) (addition amount Y=0.075).

[0120] In addition, here, in addition to calcium carbonate, magnesia, and alumina, ion-exchanged water and a dispersant (trade name: BYK180, manufactured by Bicchem Co., Ltd.) were further added and mixed. When the total of calcium carbonate, magnesia, and alumina is 100 parts by mass, the amounts added here are 100 parts by mass of ion-exchanged water and 0.30 parts by mass of the dispersant. Mix using a ball mill and mix for 3 hours.

[0121] Then, the obtained mixed powder was held in a drier (100° C.) for 6 hours to be dried.

[0122]Then, the dried mixed powder is put into an alumina crucible and calcined in an air atmosphere. Here, after heating up to 1100° C. at a heating rate of 300° C. / hour, the solid-state reaction was carried out by holding for 2 hours, and then slowly ...

Embodiment 2

[0132] Powdered calcium carbonate (CaCO 3 ), magnesium oxide (MgO) and aluminum oxide (Al 2 o 3 ) were mixed in a molar ratio of 10.2:1.8:7 (=12(1-0.15):12×0.15:7) (addition amount Y=0.15), except that, the same operation as Example 1 was performed to obtain a white Crystalline calcined powder A2. Then, it carried out similarly to Example 1, and obtained samples B2-F2 from calcined powder A2.

[0133] The electron densities of samples D2 and F2 can be seen from the ESR signals to be 9.8×10 18 / cm 3 and 3.9×10 17 / cm 3 . The electron density ratio of the sample D2 which is the sample before the heat treatment and the sample F2 which is the sample after the heat treatment is 0.04 times. That is, it can be seen that 4% of electrons remain by heat treatment, and it has high oxidation resistance.

Embodiment 3

[0135] Powdered calcium carbonate (CaCO 3 ), magnesium oxide (MgO) and aluminum oxide (Al 2 o 3 ) were mixed in a molar ratio of 9.3:2.7:7 (=12(1-0.22):12×0.22:7) (addition amount Y=0.22), except that, the same operation as in Example 1 was performed to obtain a white Crystalline calcined powder A3. Then, it carried out similarly to Example 1, and obtained samples B3-F3 from calcined powder A3.

[0136] The electron densities of samples D3 and F3 can be seen from the ESR signals to be 1.0×10 19 / cm 3 and 4.3×10 17 / cm 3 . The electron density ratio of the sample D3 which is the sample before the heat treatment and the sample F3 which is the sample after the heat treatment was 0.04 times. That is, it can be seen that 4% of electrons remain by heat treatment, and it has high oxidation resistance.

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Abstract

The present invention relates to a mayenite-type compound containing Ca, Al and oxygen, wherein part of the Ca atoms are replaced by at least one kind of atoms (M) selected from the group consisting of Be, Mg and Sr. The M/(Ca+M) atomic ratio is 0.01 to 0.50, and at least part of the free oxide ions contained in the mayenite-type crystal structure are replaced with anions of an element having an electron affinity smaller than that of oxygen.

Description

technical field [0001] The present invention relates to a mayenite-type compound and a method for producing the same. More specifically, it relates to a mayenite-type compound having improved oxidation resistance and a method for producing the same with high productivity. Background technique [0002] Mayenite-type compound, is a compound with 12CaO·7Al 2 o 3 (hereinafter also referred to as "C12A7") crystal is an isotype compound having a crystal structure equivalent to C12A7 crystal, and has 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...

Claims

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Application Information

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IPC IPC(8): C01F7/02C01F7/16C01F7/164C01F7/162C01F7/166
CPCH01J11/40C01F7/164C01F7/162C01F7/166C01P2006/40C01P2002/86C01P2006/60C01F7/16C01P2002/50C04B35/44
Inventor 伊藤和弘渡边晓宫川直通伊藤节郎
Owner ASAHI GLASS CO LTD
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