أكسيد الألومنيوم المصهور باللون البني هو منتج يتم تصنيعه عن طريق الاختزال التدريجي للبوكسيت المحروق في فرن قوس كهربائي عند درجة حرارة عالية (حوالي 2000 درجة مئوية). يتكون تركيبه الكيميائي بشكل أساسي من Al 2 O 3 (94,5-97%) وكميات ضئيلة من TiO 2 وSiO 2 وFe 2 O 3 وCaO وMgO.
يتميز أكسيد الألومنيوم البني بمتانته الجيدة ومقاومته الميكانيكية العالية وصلابته (9 على مقياس موس). تصل صلابة المادة إلى حوالي 1900 كيلو جرام/مم 2 . الوزن النوعي (الكثافة) يساوي 3,90+/-0,05 جم/سم 3 . الكثافة الظاهرية حسب الحجم تساوي 1,52-1,87 جم/سم 3 . له موصلية حرارية عالية نسبيًا وتمدد حراري منخفض. فيما يتعلق بالكهرباء فهو عازل.
| أكسيد الألومنيوم المصهور باللون البني JIS 360# | |
| التركيب الكيميائي | نسبة مئوية |
| Al2O3 | ≥94.0% |
| Fe2O3 | ≤0.5% |
| Na2O | ≤0.30% |
| ثاني أكسيد السيليكون 2 | ≤1.50% |
| ثاني أكسيد التيتانيوم | 1.5-3.8% |
| عالي | ≤0.30% |
| مؤشر فيزيائي كيميائي | |
| الكثافة الظاهرية | 1.53-1.99 جرام/سم3 |
| كثافة الحبوب | 3.90 جرام/سم3 |
| صلابة مورس | 9 |
مسحوق أكسيد الألومنيوم المصهور باللون البني هو المادة المثالية المصنعة خصيصًا لاستخدامها في تطبيقات الصنفرة العامة في أدوات الصنفرة الملتصقة وعمليات الصقل والتلميع. في حين أن أكسيد الألومنيوم يتمتع بصلابة وقدرة صقل أقل من الماس وكربيد البورون وكربيد السيليكون، فإنه يستخدم على نطاق واسع لطحن المواد الحديدية، وتشطيب المواد الصلبة والصلبة، وملء الأجزاء الخزفية عندما تكون تكلفة المعالجة مهمة.
| غرض | د0(واحد) | د3(ميكرومتر) | د50(واحد) | د94(ميكرومتر) |
| #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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