Kahverengi Erimiş Alümina, yüksek sıcaklıkta (yaklaşık 2000 santigrat derece) bir elektrik ark fırınında kalsine boksitin kademeli eritme indirgenmesiyle üretilen bir üründür. Kimyasal bileşimi esas olarak Al 2 O 3 (%94,5-97) ve kalıntı miktarda TiO 2 , SiO 2 , Fe 2 O 3 , CaO ve MgO’dan oluşur.
Kahverengi Alüminyum Oksit, iyi tokluk, yüksek mekanik direnç ve sertlik (Mohs ölçeğinde 9) ile karakterize edilir. Malzemenin mikro sertliği yaklaşık 1900 kG/mm 2’ye ulaşır . Özgül ağırlık (yoğunluk) 3,90+/-0,05 g/cm 3’e eşittir . Boyuta bağlı olarak yığın yoğunluğu 1,52-1,87 g/cm 3’e eşittir . Nispeten yüksek termal iletkenliğe ve düşük termal genleşmeye sahiptir. Elektrik açısından bir yalıtkandır.
| Kahverengi erimiş alümina JIS 360# | |
| Kimyasal Bileşim | Yüzde |
| Al2O3 | ≥%94,0 |
| Fe2O3 | ≤0,5% |
| 2 O’da | ≤0,30% |
| SiO2 | ≤1,50% |
| TiO2 | 1,5-3,8% |
| Yüksek | ≤0,30% |
| Fizikokimyasal İndeks | |
| Yığın yoğunluğu | 1,53-1,99 g/cm3 |
| Tane yoğunluğu | 3,90 gr/cm3 |
| Morse sertliği | 9 |
Kahverengi Erimiş Alüminyum Oksit Tozları, bağlanmış aşındırıcı aletlerde ve taşlama ve parlatma işlemlerinde genel aşındırıcı uygulamalar için özel olarak üretilen mükemmel bir malzemedir. Alüminyum oksit, elmas, bor karbür ve silisyum karbürden daha düşük sertliğe ve aşındırıcı kapasiteye sahip olsa da, demirli malzemelerin taşlanması, sert ve dayanıklı malzemelerin son işlemleri, işleme maliyetinin önemli olduğu seramik parçaların doldurulması için yaygın olarak kullanılır.
| Öğe | D0（bir） | D3(hımm) | D50(bir) | D94(hımm) |
| #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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