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Ce-contained rare-earth polishing powder and preparation method thereof

A technology of rare earth polishing powder and polishing powder, which is applied in the direction of polishing compositions containing abrasives, etc., to achieve the effect of simple preparation process, easy process, and high polishing flatness

Active Publication Date: 2009-10-07
GRIREM ADVANCED MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, researchers have realized the role of trivalent cerium in polishing, but there is no patent or literature report containing Ce 3+ Rare earth polishing powder and preparation method thereof

Method used

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  • Ce-contained rare-earth polishing powder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The polishing powder precursor cerium carbonate (wherein the molar ratio of cerium and total rare earth is 99.5%) is put into 700 ℃ of high-temperature furnaces and roasted for 2 hours, feeds N in the roasting furnace 2 , the maximum partial pressure of oxygen in the control atmosphere is 100Pa, and the final rare earth polishing powder product containing trivalent cerium is obtained after ball milling and sieving. The median particle size is 0.07um, and the polishing powder Ce is measured by X-ray photoelectron spectroscopy (XPS). 3+ / ΣCe = 18.8%.

[0021] The trivalent cerium-containing polishing powder and the comparative sample were made into a 5% slurry, and the liquid crystal glass was polished under the same conditions. The cutting force of the trivalent cerium-containing polishing powder product was 0.010mm / h, and the visual scratch was 0 / m 2 .

Embodiment 2

[0023] The polishing powder precursor cerium oxalate (wherein the molar ratio of cerium and total rare earth is 99.5%) is put into 650 ℃ of high-temperature furnaces and roasted for 4 hours, feeds N in the roasting furnace 2 , the maximum partial pressure of oxygen in the control atmosphere is 300Pa, after ball milling and sieving, the median particle size of the final rare earth polishing powder product containing trivalent cerium is 0.36um, and the polishing powder Ce is determined by XPS 3+ / Ce = 15.6%.

[0024] The polishing powder and the comparison sample were made into 10% slurry, and the laser glass was polished under the same conditions. The cutting force of the polishing powder product was 0.014mm / h, and the visual scratch was 1 / m 2 .

Embodiment 3

[0026] The mixture of polishing powder precursor cerium oxalate and cerium carbonate (wherein the mol ratio of cerium and total rare earth is 99.9%) is put into the high-temperature furnace of 850 ℃ and roasted for 6 hours, and ammonium fluoride (accounting for rare earth polishing powder) is added in the roasting furnace 4% of content), after ball milling and sieving, finally obtain the rare earth polishing powder product containing trivalent cerium, the median particle diameter is 0.98um, XPS measures polishing powder Ce 3+ / ∑Ce=5.6%.

[0027] Make 10% slurry of polishing powder and comparative sample, and polish zf glass under the same conditions. The cutting force of polishing powder product is 0.020mm / h, and the visual scratch is 1 / m 2 .

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Abstract

The invention provides a Ce-contained rare-earth polishing powder and a preparation method thereof. The Ce / Ce (mol ratio) of the rare-earth polishing powder is 0.5 percent to 20 percent. Low-valency Ce contained in cerium oxide crystal lattice promotes conversion between Ce and Ce, and strengthens the formation of a hydroxide hydrate softening layer between the polishing powder and glass in the polishing process as well as the polishing performance of the powder. The rare-earth polishing powder contains the Ce, thus having good suspension properties, high dispersivity, large cutting force when being applied to glass polishing, few scratches on the glass polishing surface, and high polishing planeness. The Ce-contained rare-earth polishing powder has simple as well as easily controlled preparation process and is easy for industrialized production.

Description

technical field [0001] The invention relates to a Ce-containing 3+ The rare earth polishing powder and a preparation method thereof belong to the field of rare earth powder material chemistry and preparation technology. Background technique [0002] Rare earth polishing powder is mainly used for polishing glass, crystal and other products, mainly cerium-based oxide powder, which is generally divided into low cerium polishing powder (CeO 2 / TREO<50%), medium cerium polishing powder (CeO 2 / TREO=50%-70%) and high cerium polishing powder (CeO 2 / TREO>70%. Studies have shown that the main polishing component of rare earth polishing powder is CeO 2 , pure trivalent rare earth oxides have no polishing performance, but the existence of trivalent rare earth oxides can greatly improve the CeO in rare earth polishing powder 2 polishing performance. Many commercially available rare earth polishing powders contain trivalent rare earth oxides, such as lanthanum oxide. Lantha...

Claims

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Application Information

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IPC IPC(8): C09G1/02
Inventor 黄小卫韩业斌龙志奇张顺利崔大立赵娜刘营
Owner GRIREM ADVANCED MATERIALS CO LTD
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