sillimanite

Application in ceramic field

The volume expansion of sillimanite due to mullite behavior makes it possible to use sillimanite as an additive, adding sillimanite to ceramics or other materials, and ultimately achieving the purpose of phase transformation and toughening of these materials. Honeycomb ceramics, mullite ceramics and ceramic shed panels made from sillimanite have been widely used in industry.

Application in refractory material field

Sillimanite decomposition to produce mullite at high temperature and silica, and at the same time with a certain volume expansion, so the sillimanite as the main raw materials of products or the sillimanite added to other products, the volume expansion effects can be used to effectively offset the volume of products produced in the process of high temperature firing shrinkage, limits the local stress, prevent and passivation cracks, Improve the thermal shock resistance of the product, reduce the mechanical spalling, thus improving the performance of the product, prolong the service life of the product.

Mullite - corundum products, silicon carbide - sillimanite products, sillimanite - cordierite kiln furniture, mullite - sillimanite kiln furniture, high alumina brick, castable, plastic, spray coating and other products made from sillimanite have excellent performance and are widely used.

As raw material for synthesis of mullite

Natural mullite is rare in nature, so it is often synthesized by artificial method. Sillimarite has the characteristics of wide source and low cost. The theoretical conversion rate of sillimarite to mullite is 86.0%, and 14.0% fused silica is precipitated at the same time. Therefore, mullite can be prepared by mullite reaction at high temperature.

As welding material raw material

Sillimanite concentrate contains Al2O3 and SiO2, very little water of crystallization, at the same time, S, P and other impurity elements content is very low, and sillimanite is very small thermal expansion coefficient is conducive to improve the slag removal of electrode, flux, so it is feasible to use sillimanite as the raw material of welding material.

Other areas of application

Used as friction material filler, synthetic raw material additive, but also can be used in the medical field, used to manufacture false teeth