Brown fused alumina, like white fused alumina, is one of the more commonly used abrasives on the market. Its main chemical component is AL2O3, and it can be divided into several grades such as first-grade and second-grade according to the content of alumina powder.
Brown fused alumina and white fused alumina should possess the following basic properties
Brown fused alumina and white fused alumina have chemical stability
During the grinding process, the abrasive should not react chemically with the workpiece, bonding agent, or coolant. Grinding is not merely a mechanical process; chemical reactions also play a significant role. Therefore, the abrasive should possess chemical stability to prevent chemical abrasion.
Brown fused alumina and white fused alumina have quite high hardness
The hardness of the abrasive must be higher than that of the workpiece being machined, and it must also have good wear and corrosion resistance.
Generally speaking, all other things being equal, the higher the hardness of the abrasive, the better its wear and corrosion resistance, and the better its cutting performance.
Brown fused alumina and white fused alumina are heat-resistant and exhibit high-temperature stability
During grinding, a large amount of heat is generated at the contact area between the abrasive and the workpiece, especially in high-speed and heavy-duty grinding, where local temperatures can reach as high as 1500℃.
Therefore, the abrasive used must maintain its inherent hardness and strength at the high temperatures of grinding.
For example, boron carbide, although harder than silicon carbide, is easily oxidized at high temperatures, making it unsuitable for use as grinding wheels and only suitable for use as polishing paste, thus greatly limiting its grinding applications.
