The wear resistance of the refractory material is a solid , liquid and gas flow capacity of the dust surface on its mechanical resistance to abrasive action .
Refractory wear resistance depends on the composition and structure of the material . When a single crystal material is composed of a polycrystalline compact , the wear resistance depends on the hardness of the crystals of the mineral composition of the material . High hardness , high wear resistance materials . When unusual isotropic mineral crystals , fine grain , high wear resistance of the material. When the material is constituted by a multi-phase , which has a direct relationship with the wear resistance of bulk density or porosity of the material , but also with the combination of the components Q strength. Thus , at room temperature for a certain refractory concerned, the wear resistance is proportional to its compression strength , wear resistance of the sintered article is good good . The abrasion resistance of refractory products and temperature. Some materials, such as silica-alumina -based refractory products , it is generally believed that at a certain temperature (e.g., within 700 ~ 900 ℃ below the elastic range ) , the higher the temperature the lower the wear resistance , when the temperature is increased can be considered as elastic increased modulus , wear resistance decreased. When the temperature rises , the maximum value of the elastic modulus , with the decrease in the elastic modulus , but improved wear resistance . Aluminosilicate refractory products such as during 1200 ~ 1350 ℃, wear or even better than those at room temperature . When the temperature is further increased up to above 1400 ℃ , because of the refractory products drastically lower the liquidus viscosity , wear decreases. Some quality refractory products , such as chromium , with increasing temperature , abrasion resistance increases.
In many cases, the surface of the refractory hazards caused by the mechanical abrasive action is often very serious . It is often the direct cause of the loss of the refractory material by the working surface . Sometimes , it is larger than the chemical erosion hazard or hazards caused by the chemical erosion , often exacerbated due to mechanical action . If the upper part of the blast furnace refractory lining and iron gutter often due to lack of wear and loss. Carbonization chamber of coke oven coke, refractories also vulnerable to wear and tear , steelmaking converter mouth , and the other at the tap hole by air scour and various melt flow through , the materials are often due to poor wear resistance and loss. Therefore , the wear resistance is an important refractory nature .