Nhôm oxit nâu là sản phẩm được sản xuất bằng cách nung chảy khử dần quặng bauxit đã nung trong lò hồ quang điện ở nhiệt độ cao (khoảng 2000 độ C). Thành phần hóa học của nó chủ yếu bao gồm Al 2 O 3 (94,5-97%) và một lượng nhỏ TiO 2 , SiO 2 , Fe 2 O 3 , CaO và MgO.
Nhôm oxit nâu có đặc điểm là độ dẻo dai tốt, khả năng chống chịu cơ học và độ cứng cao (9 trên thang Mohs). Độ cứng vi mô của vật liệu đạt khoảng 1900kG/mm 2 . Trọng lượng riêng (mật độ) bằng 3,90+/-0,05 g/cm 3 . Khối lượng riêng tùy thuộc vào kích thước bằng 1,52-1,87 g/cm 3 . Nó có độ dẫn nhiệt tương đối cao và độ giãn nở nhiệt thấp. Về mặt điện, nó là chất cách điện.
| Nhôm oxit nâu JIS 360# | |
| Thành phần hóa học | Phần trăm |
| Al2O3 | ≥94,0% |
| Fe2O3 | ≤0,5% |
| Vào ngày 2 O | ≤0,30% |
| SiO2 | ≤1,50% |
| TiO2 | 1,5-3,8% |
| CaO | ≤0,30% |
| Chỉ số lý hóa | |
| Mật độ khối | 1,53-1,99g/cm3 |
| Mật độ hạt | 3,90 g/cm3 |
| Độ cứng Morse | 9 |
Bột nhôm oxit nâu nóng chảy là vật liệu hoàn hảo được sản xuất chuyên biệt để sử dụng cho các ứng dụng mài mòn chung trong các công cụ mài mòn liên kết và các quy trình mài và đánh bóng. Mặc dù nhôm oxit có độ cứng và khả năng mài mòn thấp hơn kim cương, bo cacbua và silicon cacbua, nhưng nó được sử dụng rộng rãi để mài vật liệu sắt, hoàn thiện vật liệu cứng và dai, lấp đầy các bộ phận gốm khi chi phí xử lý là quan trọng.
| Mục | D0（một） | D3(ừm) | D50(một) | D94(um) |
| #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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