Factors Affecting the Bending Strength of Brown Fuesd Alumina
Zhongsen Editor 2025-08-13As an abrasive, Brown Fused Alumina has many excellent properties, such as hardness, toughness, refractoriness, etc., but today is another performance of Brown Fused Alumina that is difficult to be mentioned - bending strength. In this regard, many people may misunderstand flexural strength and compressive strength, but the two are really two different concepts. The inclined strength of brown fused alumina refers to the ability to resist deformation and fall off under the action of external forces. It is a key indicator to measure the bearing capacity of brown corundum, and is sometimes called the bending strength. Its influencing factors are mainly reflected in the abrasive tools, such as the number and size of pores, the uniformity of structure, and the bonding strength of grain blocks.
For brown fused alumina abrasive, the main influencing factors are reflected in the additives. Some people have done experiments, additives magnesium oxide and titanium oxide have a small impact on the bending strength of brown corundum abrasive, mainly reflected in: when the total content of magnesium oxide and titanium oxide accounted for 4%, the bending strength of brown fused alumina abrasive is the weakest, lower or higher than the value, the bending strength will be reduced to varying degrees.
According to the research, the reason why magnesium oxide and titanium oxide can impact the bending strength of brown corundum is that magnesium oxide can react with alumina in brown corundum to decompose magnesia-aluminum spinel, and alumina spinel is coated with oxide. The outer aluminum grain not only stimulates the grain boundary movement speed, but also stimulates the growth rate of alumina grains, thus improving the bending strength of brown corundum. Titanium oxide is oxidized to a trivalent state under high temperature conditions, which contributes to the development of the lattice, resulting in weaker flexural strength of brown corundum. In addition, the sintering temperature also has little effect on the apparent strength of brown corundum. Experiments show that the bending strength at 1500°C is much weaker than that at other temperatures.
