Amorphous Refractory Mixture
Silicate binder as the main varieties of amorphous refractory binder is alkali-containing silicate, known as water glass.
(1) water glass. Water glass is a mixture of many sodium silicate. Amorphous Refractory In the refractory material used for the modulus of 2 to 3 of the amorphous. Its density and melting point is not fixed, depending on the modulus of the corresponding changes in the modulus of 4 within the range of its density increases with the SiO2 content increased. In the amorphous refractory material used in viscous water glass, Amorphous Refractory the density of 1.30 ~ 1.40g / cm3.
1) water glass condensation and hardening: water glass has a very good adhesion. The formation of such adhesion is different depending on the coagulation and hardening conditions, but is related to the formation of agglomerated structure.
At room temperature, Amorphous Refractory condensation and hardening are very slow. Amorphous Refractory In the production of water glass to promote the hardening, often add a certain amount of hardening agent. Amorphous Refractory Usually with acid or metal ions of the add-in, so that the water glass alkali solution to neutralize the role of accelerated hydrolysis of sodium silicate, Amorphous Refractory so that silicone gel precipitation and cohesion.
Because of this water glass plus hardening agent in the atmosphere can be hardened, it is often referred to as gas hard binder.
2) water glass hardened body in the heating changes, Amorphous Refractory water glass hardened body heated to 50 ℃ or more that began to dehydrate, more than 100 ℃ when the majority of water in the silicone gel can be ruled out to 300 ℃ basic drained.
3) the application of water glass: water glass in addition to not easily with the hydration of dolomite materials with the other, with any other barren material can be prepared into a variety of unshaped refractories. However, the combination of water glass unshaped refractories, not flooding and damp.
Special refractory material is based on the purification of high-purity raw materials or synthetic high-purity raw materials based on the traditional production process and a combination of special production process from the processing of refractory products. Is an indispensable product in many industrial sectors, especially in many new technologies, new areas, in the key parts of the replacement of other products, Amorphous Refractory greatly improve the life of the original product.
1, higher melting point. Amorphous Refractory Special refractory melting point of most of the above 2000 ℃, many refractory materials melting point up to 4000 ℃.
2, the use of more pure raw materials, because there are more natural minerals in the proportion of impurities and can not meet the requirements of special refractory preparation, Amorphous Refractory so the use of more raw materials or synthetic raw materials.
3, the raw materials are mostly micron-class powder, Amorphous Refractory or even nano-powder, Amorphous Refractory usually by ball milling or chemical preparation of the preparation of micron or nano-grade powder as raw materials.
4, the preparation process diversification, Amorphous Refractory can use the grouting method, plastic molding, isostatic pressing, vapor deposition, plasma sputtering, spraying, hot pressing, fusing.
5, the product firing conditions more harsh. Amorphous Refractory In addition to the higher molding temperature requirements, in the non-oxidative sintering, but also in vacuum, inert or other specific atmosphere sintering.
6, the shape of the product more diversified. Amorphous Refractory In addition to ordinary simple shape, there are other more exquisite specific requirements of the product.
7, performance diversification. In addition to high fire resistance, but also has electricity, heat and other functional characteristics.