How to improve the wear resistance of mullite

Time:2017/8/30 17:16:36 Click on:

Mullite

     During the acquisition of mullite, we will notice that the raw materials of thorium are directly determined by the raw materials and the number of times of repeated firing. Then, in the case of unchanged raw materials, what is the quality of the product? We now use mullite as an analytical target, and only analyze the problem in the next area. A detailed comparison is made below: The wear resistance of mullite is related to its resistance to the mechanical wear of solids, liquids and dust-laden air on its surface.

In many cases, the damage caused by the mechanical abrasion of mullite surface is often very serious. It is often the direct cause of loss of the surface of the mullite stone. Sometimes it is more harmful than chemical corrosion, or it is a hazard caused by chemical corrosion, which is often aggravated by mechanical action. For example, the upper lining of the refractory lining and the metal gutter are often lost due to lack of wear resistance. Coke oven carbonization chamber refractory materials are also susceptible to coke wear, steel converter furnace mouth, tapping outlet and other areas under the flow of gas and various molten melt, are often due to poor wear and tear of the material. Therefore, the wear resistance of mullite is an important property.

The wear resistance of mullite depends on the composition and layout of the material. When the material is a fine polycrystalline body composed of a single crystal, its wear resistance depends primarily on the hardness of the mineral crystals that make up the material. High hardness, high wear resistance of the product. When the mineral crystal is non-isotropic, the crystal grains are fine and the wear resistance of the material is high. When the product consists of multiple phases, its wear resistance is also directly related to the bulk density or porosity of the product, and it is also related to the strength of the contact between the components. Therefore, at a normal temperature for a certain type of mullite mortar, its wear resistance is directly proportional to its compressive strength, and products with excellent sintering have better wear resistance. The wear resistance of refractory products is related to temperature. Some materials, such as silica-alumina refractory products, are generally considered to be at a certain temperature (such as in the range of elasticity below 700~900°C). The higher the temperature is, the lower the wear resistance is, and the elastic modulus can be considered as the temperature advances. The increase in the amount of wear resistance has declined. When the temperature rises and reaches the maximum value of the elastic modulus, the wear resistance proceeds as the elastic modulus decreases. Such as aluminum silicate refractory products at 1200 ~ 1350 °C, wear resistance and even better than normal temperature. As the temperature advances further, above 1400°C, the wear resistance decreases as the liquidus viscosity in the refractory product decreases sharply. Some refractory materials, such as chromium-containing products, increase in wear resistance with increasing temperature.

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