FIELD: abrasives.
SUBSTANCE: invention relates to alumina-based abrasive flour grains used in polishing, grinding, and finishing of surfaces of high-precision metal, glass, and stone objects. Manufacturing method according to invention comprises mixing aluminum hydroxide with inoculating crystals followed by heat-steam treatment at pressure 30 to 400 atm and temperature 340-450°C. Together of inoculating crystals, corundum crystal growth passivation agent is added to aluminum hydroxide in the form of oxide compounds of phosphorus or silicon in quantity from 0.001 to 0.1% (converted to phosphorus oxide or silicon oxide) based on the weight of alumina. As inoculating crystals, fine-crystalline α-ferric oxide or ferric oxy-hydroxides are used in quantities 0.005 to 0.3% on the weight of alumina and, as oxide compounds of phosphorus or silicon passivating corundum crystal growth, phosphoric acid, sodium polyphosphates, sodium or potassium silicates are used.
EFFECT: enabled preparation of monodisperse product having narrow crystal size distribution.
1 tbl, 7 ex
| Title | Year | Author | Number |
|---|---|---|---|
| ENVIRONMENTALLY SAFE FINE ABRASIVE POWDER FOR POLISHING SURFACES BASED ON ALUMINUM AND 3D-METAL OXIDES AND METHOD FOR MANUFACTURING THEREOF | 1996 |
|
RU2109026C1 |
| METHOD OF PREPARING FINE-GRAINED CORUNDUM | 2002 |
|
RU2229441C1 |
| METHOD OF PREPARING FINE CRYSTALLINE CORUNDUM | 1996 |
|
RU2093464C1 |
| METHOD OF PRODUCTION OF ECOLOGICALLY PURE POLISHING MICROPOWDER ON BASE OF ALUMINUM AND FERRIC OXIDES | 2001 |
|
RU2212425C2 |
| METHOD OF PREPARING FINE CRYSTALLINE CORUNDUM | 1996 |
|
RU2092438C1 |
| METHOD OF OBTAINING FINE CRYSTALLINE CORUNDUM | 2007 |
|
RU2340557C2 |
| PROCESS FOR PREPARING SINTERED MATERIAL BASED ON α- MODIFICATION OF ALUMINA | 1992 |
|
RU2076083C1 |
| METHOD OF PRODUCING RED IRON OXIDE PIGMENT | 2016 |
|
RU2640550C1 |
| METHOD FOR PRODUCING FINE-GRAINED CORUNDUM | 2016 |
|
RU2664149C2 |
| METHOD OF PREPARING FINE CRYSTALLINE CORUNDUM | 1999 |
|
RU2167817C2 |
