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Cerium oxide sol and abrasive

A cerium oxide and sol technology, applied in the direction of cerium oxide/cerium hydroxide, lanthanum oxide/lanthanum hydroxide, lanthanide oxide/hydroxide, etc., can solve the problem of irregular particle diameter

Inactive Publication Date: 2002-07-31
NISSAN CHEM IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In the method of drying, roasting and pulverizing to produce cerium oxide powder containing lanthanum or neodymium, because the pulverization method is used to make fine particles, the particle diameter is not uniform, and only submicron fine particles can be achieved.

Method used

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  • Cerium oxide sol and abrasive
  • Cerium oxide sol and abrasive
  • Cerium oxide sol and abrasive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] In a 2L glass reaction tank, add the equivalent of NH 3 / (Ce 3+ +La 3+ )=8 (mol ratio) of 25% ammonia solution 253g, from the glass nozzle whose liquid temperature is kept at 30° C., 0.5 L / min of nitrogen gas is introduced. In a 1L glass container, convert to CeO 2 The concentration is 11.5% by weight, the purity is 693g of cerium nitrate (III) aqueous solution of 99.9%, and conversion into La 2 o 3 28.5 g of an aqueous solution of lanthanum (III) nitrate having a concentration of 14.0% by weight and a purity of 99.99% or higher was mixed. This mixed aqueous solution contained lanthanum in such a ratio that the molar ratio in terms of La / (Ce+La) was 0.05. While stirring this mixed aqueous solution, it was slowly added to a 2 L glass reaction vessel over 30 minutes to obtain a hydroxide suspension. Next, after raising the temperature of the suspension to 80° C., the gas flow from the glass nozzle was switched from nitrogen to 0.5 L / min of air to start the oxidation...

Embodiment 2

[0077] In a 2L glass reaction tank, add the equivalent of NH 3 / (Ce 3+ +La 3+) = 8 (mol ratio) of 25% ammonia solution 253g, blowing 0.5L / min of nitrogen gas from the glass nozzle whose liquid temperature was kept at 30°C. In a 1L glass container, convert to CeO 2 The concentration is 11.5% by weight, the cerium nitrate (III) aqueous solution 693g of purity 99.9%, and conversion into La 2 o 3 28.5 g of an aqueous solution of lanthanum (III) nitrate having a purity of 99.99% or higher at a concentration of 14.0% by weight was mixed. This mixed aqueous solution contained lanthanum in such a ratio that the molar ratio in terms of La / (Ce+La) was 0.05. This mixed aqueous solution was slowly added to a 2 L glass reaction tank over 30 minutes while stirring, to obtain a hydroxide suspension. Next, after raising the temperature of the suspension to 80° C., the gas blowing from the glass nozzle was switched from nitrogen to 0.5 L / min of air to start the oxidation reaction of ceri...

Embodiment 3

[0082] In a 2L glass reaction tank, add the equivalent of NH 3 / (Ce 3+ +La 3+ ) = 8 (mol ratio) of 25% ammonia solution 253g, blowing 0.5L / min of nitrogen gas from the glass nozzle whose liquid temperature was kept at 30°C. In a 1L glass container, convert to CeO 2 The concentration is 11.5% by weight, the cerium nitrate (III) aqueous solution 693g of purity 99.9%, and conversion into La 2 o 3 56.8 g of an aqueous solution of lanthanum (III) nitrate having a purity of 99.99% or higher at a concentration of 14.0% by weight was mixed. This mixed aqueous solution contained lanthanum in such a ratio that the molar ratio in terms of La / (Ce+La) was 0.10. This mixed aqueous solution was slowly added to a 2 L glass reaction vessel over 30 minutes while stirring, to obtain a hydroxide suspension. Next, after raising the temperature of the suspension to 80° C., the gas blowing from the glass nozzle was switched from nitrogen to 0.5 L / min of air to start the oxidation reaction of c...

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Abstract

There is provided an abrasive used for polishing a substrate which comprises silica as a main component. The abrasive contains a sol inwhich particles are dispersed in a medium, wherein the particles have a particle size of 0.005 to 1 mum and comprise as a main component crystalline cerium oxide of the cubic system and as an additional component a lanthanum compound, a neodymium compound or a combination thereof, wherein the additional component is contained in X / (Ce + X) molar ratio of 0.001 to 0.5 in which X is lanthanum atoms, neodymium atoms or a combination thereof. High speed polishing and high quality glazed surface can be obtained by application of this abrasive.

Description

technical field [0001] The invention of the present application relates to a production method of a sol formed by dispersing particles containing lanthanum compounds or neodymium compounds and cerium oxide as the main component in a medium. Particles containing lanthanum or neodymium and mainly composed of cerium oxide can be used in abrasives, ultraviolet absorbing materials, materials for catalysts, and materials for fuel cells. Background technique [0002] JP-A-56-131686 discloses that cerium salt, alkaline solution, anion and salt solution that can form insoluble rare earth oxides are mixed simultaneously, and the precipitate obtained by filtering is dried at 100-600°C and dried at 600-1200°C. Calcined, cerium oxide powder containing crushed lanthanum. [0003] Japanese Patent Application Laid-Open No. 10-95614 discloses that under an inert gas atmosphere, a cerium (III) salt and an alkaline substance in an aqueous medium are mixed according to a ratio of 3 to 30 (OH ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F17/224C01F17/229C01F17/235C09G1/02C09K3/14
CPCC01P2006/12C09G1/02C01F17/0043C01P2004/10C01P2002/72C09K3/1472C01P2002/01C01P2004/64B82Y30/00C01P2004/62C01P2004/61C01F17/229C01F17/235C01F17/224
Inventor 太田勇夫谷本健二西村透
Owner NISSAN CHEM IND LTD
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