Title:
ABRASIVES
Document Type and Number:
Japanese Patent JPS5474586
Kind Code:
A
Abstract:
A method of making aggregated diamond abrasive particles comprising forming a mixture of diamond abrasive particles and a powdered metal, heating the mixture to sinter the metal followed by cooling to produce a mass and crushing the mass to obtain the aggregated particles, characterized in that the particles are selected from Types A, B and C, as hereinafter defined, and mixtures thereof: Particles of Type A have the following characteristics: 1. A Friatest Index of about 70 to 90 for those particles of size 74 to 88 microns. 2. Medium metal content. 3. Predominantly translucent color with the occasional transparent white, grey and yellow particle. 4. Predominantly blocky shape tending towards elongate particles. 5. Predominantly rough and undulating surface. Particles of Type B have the following characteristics: 1. Weak, having a Friatest Index of about 65 to 88 for those particles of size 74 to 88 microns. 2. A high metal content. 3. Predominantly dark in color. 4. A blocky and irregular shape. 5. Rough with surface irregularities, re-entrant angles and etch pits. Particles of Type C have the following characteristics: 1. Medium strength, having a Friatest Index in the range about 100 to 121, for those particles of size 74 to 88 microns. 2. Low metal content. 3. Predominantly yellow in color. 4. An angular to blocky shape with sharp edges. 5. A predominantly smooth surface. The particles so produced are particularly useful in the grinding, particularly dry grinding, of carbides, nitrides and abrasive compacts.
Inventors:
KORUNIIRIASU FUAARU
Application Number:
JP11213078A
Publication Date:
June 14, 1979
Filing Date:
September 12, 1978
Export Citation:
Assignee:
DE BEERS IND DIAMOND
International Classes:
B22F9/02; B24D3/00; B24D3/28; C01B31/06; C04B35/52; C09C1/68; C09K3/14; C22C26/00; (IPC1-7): B22F9/00; B24D3/00
Domestic Patent References:
| JPS50153387A | 1975-12-10 |