Коричневый плавленый глинозем — продукт, получаемый путем постепенного восстановительного плавления прокаленного боксита в электродуговой печи при высокой температуре (около 2000 градусов по Цельсию). Его химический состав в основном состоит из Al 2 O 3 (94,5-97%) и незначительного количества TiO 2 , SiO 2 , Fe 2 O 3 , CaO и MgO.
Коричневый оксид алюминия характеризуется хорошей прочностью, высокой механической прочностью и твердостью (9 по шкале Мооса). Микротвердость материала достигает около 1900 кГ/мм 2 . Удельный вес (плотность) равен 3,90+/-0,05 г/см 3 . Насыпная плотность в зависимости от размера равна 1,52-1,87 г/см 3 . Он имеет относительно высокую теплопроводность и низкое тепловое расширение. В отношении электричества является изолятором.
| Коричневый плавленый глинозем JIS 360# | |
| Химический состав | Процент |
| Аl2O3 | ≥94,0% |
| Fe2O3 | ≤0,5% |
| На 2 О | ≤0,30% |
| SiO2 | ≤1,50% |
| TiO2 | 1,5-3,8% |
| Высокий | ≤0,30% |
| Физико-химический индекс | |
| Насыпная плотность | 1,53-1,99 г/см3 |
| Плотность зерна | 3,90 г/см3 |
| твердость по Морзе | 9 |
Коричневый плавленый порошок оксида алюминия — идеальный материал, специально созданный для использования в качестве абразива общего назначения в абразивных инструментах на связке, а также в процессах притирки и полировки. Хотя оксид алюминия имеет более низкую твердость и абразивную способность, чем алмаз, карбид бора и карбид кремния, он широко используется для шлифования черных металлов, отделки прочных и твердых материалов, заполнения керамических деталей, когда стоимость обработки имеет важное значение.
| Элемент | D0 (один) | D3(мкм) | Д50(один) | D94(ум) |
| #240 | <127 | <103 | 57,0±3,0 | ＞40 |
| #280 | <112 | <87 | 48,0±3,0 | ＞33 |
| #320 | <98 | <74 | 40,0±2,5 | ＞27 |
| #360 | <86 | <66 | 35,0±2,0 | ＞23 |
| #400 | <75 | <58 | 30,0±2,0 | ＞20 |
| #500 | <63 | <50 | 25,0±2,0 | ＞16 |
| #600 | <53 | <41 | 20,0±1,5 | ＞13 |
| #700 | <45 | <37 | 17,0±1,5 | ＞11 |
| #800 | <38 | <31 | 14,0±1,0 | ＞9.0 |
| #1000 | <32 | <27 | 11,5.±1,0 | ＞7.0 |
| #1200 | <27 | <23 | 9,5±0,8 | ＞5.5 |
| #1500 | <23 | <20 | 8,0±0,6 | ＞4.5 |
| #2000 | <19 | <17 | 6,7±0,6 | ＞4.0 |
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