- Different definitions
Brown fused alumina (BFA) is a brown tetragonal aluminum oxide particle with high hardness, high strength, low wear and other characteristics. It is mainly used in grinding, refractory materials, engineering ceramics, cutting tools and other fields. Brown corundum can also be divided into two grades: A (Al₂O₃>98.5%) and F (Al₂O₃≥97 and Al-Ca or B plasma can reach ≤2).
White fused alumina (WFA) is a white cube, made of finely washed and screened high-quality aluminum oxide powder as raw material. The high-purity, high-hardness, ground powder particles can better adapt to high-efficiency grinding processing.
- Different performance
Brown fused alumina has a relatively high hardness and is more suitable for grinding, especially for harder metal materials. Its grinding wheel has good toughness, is not easy to break, has a relatively long service life, and has a low probability of vibration and sand falling off during use. But its cutting edge is sharp and has high cutting efficiency. Suitable for grinding carbide, optical instruments, pipe threads, ceramics, etc.
White fused alumina has a slightly lower hardness than brown corundum and good toughness, which is suitable for resin reinforcement; at the same time, it is not easy to clog and can be continuously ground and polished for a long time; cutting is light and efficient. It is also suitable for precision casting, precision parts grinding and various hard materials processing.
- Different applications
Brown fused alumina is widely used in the field of grinding, such as ball pin reaming, grinding carbide and other precision operations; in addition, it is also used for grinding and polishing equipment parts as refractory materials and can be used as kiln tools. White fused alumina has relatively more application areas. In addition to meeting the above application range of brown corundum, it can also be used in resin reinforcement and other aspects.
- Different production processes
The production process of brown fused alumina mainly adopts the high-temperature smelting method to reduce and smelt bauxite and coke in a blast furnace to obtain brown corundum. The production process of white fused alumina is to add raw materials such as bauxite to the molten block, melt it at high temperature to form a viscous liquid with low viscosity, add a certain amount of binder to adjust it to a semi-dry state, and then use a vibration molding machine to form a green body of a certain specification, and then use a firing system to make it completely sintered to obtain the finished product.
Summary: There are obvious differences in performance and application between brown fused alumina and white fused alumina, so in actual use, it is necessary to select the appropriate abrasive according to specific needs. In addition, other factors such as processing efficiency and processing cost need to be considered when selecting abrasives.