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Abrasive particles, abrasive articles, and methods of making and using the same

A technology of abrasive particles and abrasive products, applied in the direction of chemical instruments and methods, abrasives, manufacturing tools, etc., can solve the problems of limited supply, increased cost, etc., and achieve the effect of excellent abrasive performance characteristics

Active Publication Date: 2018-12-07
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

REO availability has become a major issue for all industries in recent years, limiting supply and driving up costs

Method used

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  • Abrasive particles, abrasive articles, and methods of making and using the same
  • Abrasive particles, abrasive articles, and methods of making and using the same
  • Abrasive particles, abrasive articles, and methods of making and using the same

Examples

Experimental program
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Effect test

Embodiment 1

[0166] The abrasive particles of Example 1 were prepared by preparing a boehmite sol-gel using the following recipe: High shear mixing containing water (1480 wt. parts) and 70% aqueous nitric acid (38 parts by weight) and 115 g of a 7.2% iron oxide seed slurry for 1 minute to disperse DISPERAL alumina monohydrate powder (700 parts by weight, available from Sasol North America (SasolNorth America)) . The obtained sol was evenly poured into a 22cm×33cm×5cm PYREX tray, and dried in a forced air oven at 95°C for about 24 hours.

[0167] The resulting dry material was crushed to form granules using a Braun type UD pulverizer with a 1.1 mm gap between steel plates. The granules were sieved to provide 0.125 to 1 mm sized granules.

[0168] The screened granules were calcined at about 700°C using a conventional rotary calciner, a 23 cm diameter, 4.3 meter long stainless steel tube with a 2.9 meter hot zone at 2.4 degrees relative to the horizontal Tilt and spin at 7 rpm to provide ...

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Abstract

Abrasive particles include: 0.50 to 5.00 weight percent of seed particles for alpha-alumina formation selected from the group consisting of alpha-Fe2O3 seed particles, alpha-Al2O3 seed particles, and combinations thereof; 0.50 to 5.00 weight percent of MgO; 0.02 to 0.40 weight percent of Li2O or a molar equivalent amount of at least one alkali metal oxide selected from the group consisting of: Na2O; K2O; combinations of Na2O and Li2O; combinations of K2O and Li2O; combinations of Na2O and K2O; and combinations of Li2O, Na2O, and K2O; and 91.08 to 99.48 weight percent of Al2O3. Methods of making the abrasive particles and abrasive articles incorporating them are also disclosed.

Description

technical field [0001] The present invention relates to abrasive grains and methods for their preparation. The abrasive particles can be incorporated into a variety of abrasive articles, including bonded abrasives, coated abrasives, nonwoven abrasives, and abrasive brushes. Background technique [0002] Alpha-alumina is widely used as an abrasive in the abrasive industry. It can be used in pure form or, more preferably, with additives that enhance its grinding properties. Many commercially important alpha-alumina abrasive grains are derived from sol-gel precursors. They are produced by preparing a dispersion (e.g. sol) comprising water, an alpha-alumina precursor such as alumina monohydrate (boehmite) and optionally a peptizing agent (e.g. an acid such as nitric acid) and then Gelling the dispersion, drying the gelled dispersion, crushing the dried dispersion into particles, calcining the particles to remove volatiles, and sintering the calcined particles at a temperature...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K3/14
CPCB24D11/00B24D11/02C04B35/1115C04B2235/3201C04B2235/3203C04B2235/3206C04B2235/3218C04B2235/3272C04B2235/443C04B2235/5296C04B2235/5409C04B2235/5454C04B2235/77C04B2235/80C04B2235/96C09K3/1436C09K3/1445C04B35/10C04B35/62655C04B35/64C04B2235/322C09K3/1409
Inventor 拉里·D·门罗格兰特·E·格雷什科
Owner 3M INNOVATIVE PROPERTIES CO
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