Practical Application and Abrasion Resistance of Refractory Materials

In many cases, refractory materials by mechanical wear surface role and the harm caused by the often very serious. It is often refractory materials by the working surface of the direct reason for loss. Sometimes, it is greater than the chemical erosion hazard, or is caused by chemical erosion hazard, often aggravated due to mechanical function. 

The upper part of the refractory materials such as blast furnace lining and iron ditch often lack for abrasion resistance losses. Coke oven chamber refractory material also vulnerable to coke oven, wear, steelmaking converter of tapping by scouring and air flow and other various melted liquid flows through the place, are often due to material wear resistance sent loss. Therefore, the wear resistance of refractories is a important properties.

Refractory material wear resistance depends on the material composition and structure. When the material for a single crystals constitute the density of the negative, the wear resistance of the materials mainly depends on the hardness of mineral crystals. High hardness, wear resistance of the material is high. 

As the mineral crystal to the same sex, grain, the wear resistance of the tiny material is higher. When the material by multiphase constitute, its wearability is with the material volume density or porosity, also have a direct relationship with the various components of the bonding strength of the relevant. Ask Therefore, in normal temperature to a kind of refractory material is concerned, its wear resistance and high crushing strength, sintering is proportional to the good products its wearability is better also. 

The wear resistance of refractory products with the temperature. Some materials such as silicon of aluminium refractory products, it is generally thought that it in certain temperatures (as in 700 ~ 900 ℃ the following elastic range),  the higher the temperature abrasion resistance is less, can think that when the temperature increase with the increase of the elastic modulus, wear resistance is reduced. 

When the temperature rise, to a maximum of elastic modulus, along with the modulus of elasticity decreased, wear resistance instead has improved. Such as aluminum silicate refractory products in 1200 ~ 1350 ℃， wear resistance and even better than the normal temperature. When the temperature of 1400 ℃， further improve the above, because of refractory products liquid viscosity sharply reduced, wear resistance decreases. Some refractory materials such as quality products containing cr, along with the temperature, abrasion resistance increased.