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Common silica sol casting method

Number of visits: Date:8/3/2016

  Many people in the industry with silica sol, but before the introduction of silicasol casting let us a redo the understanding.

  A, Chinese name: silica sol

  Second, the English name: silica sol

  Definition: fine silica particles in water to form stable dispersions.

  Four, properties:

  Silica sol is a colloidal solution, non-toxic, odourless, formula can be represented as mSiO2nH2O.

  1. Due to the fine colloid particles (10-20 nm), there are quite a large specific surface area, particle itself is colorless, transparent, do not affect is the essence of mulch.

  2. Low viscosity, water seepage can penetrate everywhere, so when mixed with other material dispersion and the permeability is very good.

  3. When silicon sol moisture evaporation, firmly adhere to the surface, the colloidal particles between particles to form silica, is a good adhesive.

  Fifth, use

  1. Used for all kinds of refractory binder, with strong cohesive force, resistance to high temperature (1500-1600 ° C), etc.

  2. Used in the coatings industry, can make the coating is firm, and dirty dust resistance, ageing resistance, fire protection, etc.

  3. Used for thin shell precision casting, can make the shell mold strength is big, high casting finish. Its modelling is better than sodium silicate modelling quality, instead of ethyl silicate modelling can reduce costs and improve operating conditions.

  4. Silica sol have higher specific surface area, can be used in the catalyst manufacture and catalyst carrier.

  5. Used in the papermaking industry, can be used as cellophane adhesive, photographic paper before treating agent, cement bags of anti-skid agent, etc.

  6. Used for textile sizing agent, it has to do with oil and spinnability of wool, rabbit hair, reduce end breakage, and prevents the fly, improve yield and increase economic benefits.

  7. Tube used for silicon steel sheet treatment agent, dispersant, floor wax, sliding resistance, etc.

  Silica sol casting has the advantages of high dimensional accuracy, good surface quality, is a widely used less, no cutting of advanced technology, using silicasol casting method can be frugal machine tool equipment and a large number of processing time, also greatly saving metal materials. Silica sol casting in the field of precision casting is a widely used way of precision casting, this way of precision casting effectively reduce the cost and improve the precision casting enterprise's competitiveness. Casting is one of the most important steps in the silica sol casting, so what's the common casting silicasol casting method?

  1. The crystallization under pressure

  Put pressure tank shell casting, finished, immediately closed pressure tank, the tank ventilation with high pressure air or inert gas, make the casting solidification under pressure, to increase the density of castings.

  2. The vacuum suction pouring

  Put vacuum pouring box, shell by shell in the tiny pore suck gas in the cavity, can make the liquid metal mold filling better, copy the shape of the cavity, improve casting accuracy, prevent the pores, lack of casting defects. This method is more common abroad.

  3. The directional crystallization

  Some such as turbine blades, such as magnetic steel investment castings, if their crystal structure is arranged in a certain direction of the columnar crystal, their performance will improve a lot, so the investment casting directional crystallization technology is rapidly developed. 4. Type thermal gravity casting

  This is the most widely used form of a casting, namely after the shell from the roaster, free pouring at high temperature.

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