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Sintered abrasive particles, method of making the same, and abrasive articles including the same

A technology of abrasive particles and abrasive products, applied in abrasives, alumina preparation, chemical instruments and methods, etc., can solve problems such as increasing complexity and cost

Active Publication Date: 2015-11-25
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, the use of seeds and / or alpha alumina crystal size modifiers adds complexity and cost to the sol-gel process

Method used

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  • Sintered abrasive particles, method of making the same, and abrasive articles including the same
  • Sintered abrasive particles, method of making the same, and abrasive articles including the same
  • Sintered abrasive particles, method of making the same, and abrasive articles including the same

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0116] Shaped calcined boehmite prepared according to Preparation of Shaped Calcined Boehmite Particles (above) was graded using a test sieve to retain -140+200 mesh (i.e. between 106 micron test sieve mesh size and 75 micron test sieve Ratio collected between pore sizes). The resulting sieved particles were fed slowly (about 0.5 g / min) using a vibrating feeder into a funnel fed with a hydrogen / oxygen / argon (ratio 18 / 15 / 0 respectively) lance flame which heated the calcined particles, And the screened particles were transported directly into a 19 liter (5 gallon) rectangular metal container (41 centimeters (cm) x 53 cm x 18 cm) that effectively quenched the resulting sintered abrasive particles. The spray gun was a Bethlehem bench top burner PM2DModel B available from Bethlehem Apparatus Co., Hellertown, Pennsylvania. The lance had a central feed port (3 / 16 inch (0.475 cm) ID) through which feed particles were introduced vertically down the flame along the longitudinal axis of...

example 2 to example 7

[0121] Example 1 was repeated except that the gas mixture was adjusted as listed in Table 1. The angle at which the flame hits the metal vessel is about 90°, and the flame length, including the afterburning hot off-gas, is about 70 centimeters (cm) from the burner to the vessel surface. The resulting shaped sintered abrasive particles were collected for analysis. The temperature of the particles leaving the flame is measured with an optical pyrometer. The representative microstructures of examples 2 to 7 are respectively in Figure 7 to Figure 12 shown in .

example 8

[0125] Example 1 was repeated except that the torch used a gas mixture consisting of 16 parts hydrogen, 16 parts oxygen and 2 parts argon. This is the gas flow mixture that produced the lowest temperature flame that successfully produced alpha alumina particles as determined by X-ray diffraction analysis. A sample of shaped alpha alumina abrasive grains was mixed with mounting resin (Clear Thermoplastic Powder 165-10005 from Allied High Tech Products, Rancho Dominguez, California) and polished using a diamond slurry A visually smooth surface was obtained to evaluate the cross-section of the calcined particles by backscattered electron images using a scanning electron microscope at 10,000X magnification.

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Abstract

A method of making sintered abrasive particles includes passing alumina precursor particles through a flame under conditions such that they are converted to alpha alumina. The precursor particles comprise a precursor of alpha alumina and have an average particle size of less than or equal to 500 microns. Sintered abrasive particles have a cellular microstructure comprising alpha alumina crystal grains of alpha alumina having a maximum dimension of less than about 3 microns are also disclosed. The sintered abrasive particles have an average particle size of less than or equal to 500 microns, and are essentially free of seed particles and alpha alumina grain size modifiers. Abrasive articles comprising a binder and a plurality of the sintered abrasive particles are also disclosed.

Description

technical field [0001] The present disclosure relates broadly to abrasive particles and methods of making and using them. Background technique [0002] The sintered abrasive grains and abrasive articles comprising the sintered abrasive grains can be used in the manufacture of products to abrade, finish or grind a variety of materials and surfaces. A variety of known abrasive grains, fused abrasive grains (including, for example, fused alumina, heat-treated fused alumina, and fused alumina-zirconia) and sintered ceramic abrasive grains (including sol-gel derived sintered Ceramic abrasive particles) are widely used in the abrasive field. [0003] Alpha alumina abrasive grains are the main class of abrasive grains used in the abrasives industry. Typically by charging a furnace with a source of alumina such as aluminum ore or alumina and other desired additives, heating the material above its melting point, cooling the melt to provide a hardened mass, crushing the hardened mas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00B22F3/10B24D3/06C01F7/027
CPCC04B35/6268C01F7/027C01P2004/03C01P2004/45C01P2004/61C04B35/1115C04B35/62665C04B2235/3218C09K3/1409C01F7/38C01P2004/62
Inventor 德怀特·D·埃里克森阿纳托利·Z·罗森弗兰茨
Owner 3M INNOVATIVE PROPERTIES CO