Refractory materials in practical application
Jun 10,2014
The resistance of refractories is a solid, a liquid and resistance to the dust on the surface of the airflow mechanical function.
In many cases, refractory materials by mechanical wear surface and the damage is often very serious. It is often by its working surface of refractory material loss. Sometimes, it is greater than the chemical erosion hazard, or is caused by chemical erosion hazard, often due to mechanical function. If the blast furnace lining the refractory materials and iron deficiency and resistance of ditch. Coke chamber refractory material also vulnerable to coke oven, wear, steelmaking converter of steel and other scouring and various melted liquid air flows, often because of poor resistance materials and loss. Therefore, the resistance of refractories is an important properties.
Refractory material composition and resistance depends on structure. When the materials for single crystals constitute the polycrystal density, its wearability mainly depends on the composition of the material of crystal mineral hardness. High hardness, resistance materials. When the mineral crystals for the positive, grain, the wearability high fine material. When the material by multiphase constitute, its wearability and material volume density and porosity, also have a direct relationship with each component on bonding strength of ask. Therefore, in the room temperature of a kind of refractory material, its wearability and compression strength is proportional to the sintering good products, its wearability is better also. Refractory products with temperature abrasion. Some materials such as silicon aluminium is generally considered refractory products in certain temperatures (such as in 700-900 degrees below the elastic range), hotter wearability, can think when the temperature increase with the increase of elastic modulus, abrasion resistance decreased. When the temperature, the elastic modulus maxima, with the modulus of elasticity and reduce wear instead. Such as sour alumina refractory products in 12-1350 ° c, abrasion resistance and even better than normal. When the temperature reaches 14 degrees Celsius, further improve above the liquid viscosity for refractory products, abrasion resistance decreases sharply lower. Some refractory materials such as quality products, containing cr, abrasion resistance increases with temperature.
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