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Praseodymium-containing ultrafine high-precision rare earth polishing powder and its preparation method

A rare earth polishing powder, precision technology, applied in polishing compositions containing abrasives, chemical instruments and methods, other chemical processes, etc., can solve the problems of scratching the grinding surface, complicated preparation procedures, etc. The effect of good dispersion, suspension and narrow distribution

Inactive Publication Date: 2013-10-23
INNER MONGOLIA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The product preparation process is complicated, and the central particle size of the product is 5 μm to 7 μm, which will scratch the grinding surface of the parabola in the application. It is only suitable for rough polishing of the workpiece. If you want to improve the surface finish of the workpiece, you need to carry out fine polishing in the subsequent process. grind

Method used

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  • Praseodymium-containing ultrafine high-precision rare earth polishing powder and its preparation method
  • Praseodymium-containing ultrafine high-precision rare earth polishing powder and its preparation method
  • Praseodymium-containing ultrafine high-precision rare earth polishing powder and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Get 331.4ml of 222.1g / l lanthanum chloride solution, 735.7ml of 195.4g / l cerium chloride solution, and 104.2ml of 121.4g / l praseodymium chloride solution and mix. Among them, CeO 2 / TREO=62.5%, La 2 o 3 / TREO=32.0%, Pr 6 o 11 / TREO=5.5%. Add the mixed rare earth chloride solution to 1.5 L with deionized water, and preheat to 50°C in a water bath. Then add 50°C saturated ammonium bicarbonate solution until the pH of the solution is 6, stop the dropwise addition, after the reaction is complete, age at 50°C for 20 minutes, then vacuum filter, redisperse the filter cake in 50°C deionized water and stir Evenly filter again to remove ammonium chloride in the solution.

[0028] Add 34.5ml of hydrofluoric acid (40%) to the mixed rare earth carbonate and add water to adjust the slurry. After reacting at 50°C for 0.5h, age at 50°C for 1h, pass the water through the vacuum filtration system, and put it in a drying oven at 80°C. The drying time was 24 hours to obtain a polis...

Embodiment 2

[0031]Get 331.4ml of 222.1g / l lanthanum chloride solution, 771.0ml of 195.4g / l cerium chloride solution, and 47.3ml of 121.4g / l praseodymium chloride solution and mix them. Among them, CeO 2 / TREO=65.5%, La 2 o 3 / TREO=32.0%, Pr 6 o 11 / TREO=2.5%. Add deionized water to the mixed rare earth chloride solution to make up to 1.8L, and preheat to 60°C in a water bath. Then add 60°C saturated ammonium carbonate solution until the pH of the solution is 6, stop the dropwise addition, after the reaction is complete, age at 60°C for 40 minutes, then vacuum filter, redisperse the filter cake in 60°C deionized water and stir evenly The ammonium chloride in the solution was removed by suction filtration again.

[0032] Add 37.4ml of hydrofluoric acid (40%) to the mixed rare earth carbonate and add water to adjust the slurry, react at 60°C for 0.5h, then age at 50°C for 0.8h, pass the water through the vacuum filtration system, and put it in a drying oven at 100°C, The drying time w...

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Abstract

The invention discloses a praseodymium-containing ultrafine high-precision rare earth polishing powder and its preparation method. The polishing powder is used as a grinding material and contains cerium oxide, lanthanum oxide and praseodymium oxide, and the total rare earth content TREO is more than 92wt%. CeO2 / TREO=60-70%, La2O3 / TREO=30-35%, Pr6O11 / TREO=2-7%, and Nd2O3 / TREO is less than or equals to 0.1%. In order to raise the polishing effect, the fluorine element which has chemical effects is added during the wet synthesis process. Thus, the prepared rare earth polishing powder can be endowed with good polishing grinding surface. Through deposition, fluorination, wet grinding and roasting of mixed rare earth chloride, the praseodymium-containing rare earth polishing powder is obtained. The grain diameter D50 of the rare earth polishing powder is 0.3-1micron. The rare earth polishing powder has advantages of good suspensibility, dispersibility, narrow particle size distribution and high polishing grinding surface smoothness, and is especially suitable for polishing of high-precision elements.

Description

[0001] technical field [0002] The invention belongs to the field of preparation of rare earth products, in particular to an ultrafine high-precision rare earth polishing powder containing praseodymium and a preparation method thereof. The prepared ultrafine high-precision rare earth polishing powder containing praseodymium has high polishing precision and extremely small Central particle size, narrow particle size distribution. Background technique [0003] In recent years, the domestic demand for rare earth polishing powder has become increasingly strong, and the polishing requirements for high-end precision components have also become higher, which has stimulated domestic research on high-end polishing powder. At present, advanced polishing powder is mainly used in: liquid crystal displays, electronic precision devices, high-end optical components, liquid crystal glass substrates, hard disk glass substrates, etc. At present, there are many researches on white powder in ...

Claims

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Application Information

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IPC IPC(8): C09K3/14C09G1/02
Inventor 李梅柳召刚王觅堂胡艳宏陶豹张盼
Owner INNER MONGOLIA UNIV OF SCI & TECH
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