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Cerium-based abrasive and production process thereof

A technology of abrasives and production methods, applied in other chemical processes, polishing compositions containing abrasives, rare earth metal fluorides, etc., can solve problems such as unfavorable glass surface, poor chemical action, and reduced relative concentration of cerium oxide

Inactive Publication Date: 2004-02-25
SHOWA DENKO KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when this method is used, the relative concentration of cerium oxide is reduced, resulting in poor chemistry
In addition, powdery particles with high hardness can also cause unfavorable defects on the glass surface (of the substrate to be processed), such as dents and scratches

Method used

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  • Cerium-based abrasive and production process thereof
  • Cerium-based abrasive and production process thereof
  • Cerium-based abrasive and production process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Will contain 47% by mass of rare earth elements (calculated as oxides), 53% by mass of impurities other than rare earth elements, 2% by mass of medium to heavy rare earth elements (calculated as oxides), 8% by mass Nd (calculated as oxides) Rare earth concentrate (ore) treatment to obtain mixed light rare earth compounds. In these mixed light rare earth compounds, the content of impurities other than rare earth elements is reduced to not more than 1% by mass, and the contents of medium to heavy rare earth elements and neodymium are reduced to not more than 1% by mass, respectively. Carbonation of this compound with ammonium bicarbonate yields mixed rare earth carbonates.

[0051] The obtained mixed rare earth carbonate contained 49% by mass of rare earth elements, calculated as oxides, and 60% by mass of cerium was contained in these rare earth elements. Two liters of mixed rare earth carbonates were calcined in an electric furnace at 800° C. for 2 hours to obtain mixe...

Embodiment 2

[0065] The procedure of Example 1 was repeated except that 80 parts by weight of the mixed rare earth carbonate obtained by carbonating the uncalcined mixed light rare earth compound with ammonium bicarbonate was replaced by 40 parts by weight of the mixed rare earth used as the first raw material The oxides are substituted, thus forming a mixture of mixed rare earth oxides and mixed rare earth carbonates, which then yields cerium-containing abrasives.

[0066] The above cerium-containing abrasive was polished by the same method as used in Example 1, and the condition of the polished surface was evaluated. The polishing characteristics and physical properties of the abrasives are shown in Tables 1 and 2 below, respectively. Comparative example 1:

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Abstract

A mixed light rare earth compound which has been obtained by chemically removing medium-to-heavy rare earth elements, Nd and impurities other than rare earth elements from an ore containing rare earth elements is fired at 500 to 1100 DEG C. to yield a mixed rare earth oxide. A cerium-based rare earth oxy-fluoride is added to the mixed rare earth oxide to obtain a mixture. The mixture is subjected to wet-pulverization, drying, firing, disintegration and classification to thereby yield a cerium-containing abrasive.

Description

[0001] Cross-references to related applications: [0002] This application is filed under 35 U.S.C. $111(a) and is claimed pursuant to 35 U.S.C. $119(e)(1) filed under 35 U.S.C. $111(b) on February 21, 2001, provisional Filing date of provisional application No. 60 / 269,843. Technical field: [0003] The present invention relates to a cerium-containing abrasive for polishing materials such as glass, and to a method of producing such an abrasive. More specifically, the present invention relates to the production process of cerium-containing abrasive, and the main component of this cerium-containing abrasive is cerium oxide, which is used to polish the substrate of high-precision glass, such as the glass substrate of hard disk, the glass of liquid crystal display panel Substrate etc. technical background [0004] In recent years, many uses for glass materials have been found, and in some cases the demand for surface finishing of glass materials is increasing. For example, in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F17/241C03C19/00C09K3/14
CPCC01P2006/12C01F17/0062C01P2002/72C01P2002/76C03C19/00C01P2002/74C01F17/0043C01P2002/60C09K3/1409C01F17/265C01F17/241
Inventor 别所直纪玉村英雄
Owner SHOWA DENKO KK
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