The use of ceramic fibers

Varnish application effect
The protective coating material to the surface of the refractory substrate firmly adhered, siloxane bond, structure compact and hard, especially refractory surface coated with silicon carbide, the protective layer formed by the aluminum-rich layer and a silicon oxide layer rich composition, can prevent the erosion of oxygen and combustion gas, oxidation with good effect, to prevent deterioration of the refractory.
Application Examples
The size of 70 mesh and 150 mesh alumina ceramic fiber equal to the same fiber blend, and then to take the mixed ceramic fiber 38% silica sol as the main component 61.8% inorganic binder, and then with 0.2% carboxymethyl cellulose with a viscosity of 10 poise fire resistant protective coating agents, coating thickness in the range of 0.7-7mm, the change in thickness per 0.1mm were coated on the surface of the silicon carbide refractory plate, into a maximum temperature of 1350 ℃ firing kilns into 12 hours, removed, impact resistance values ??measured. Measurement results showed that the protective coating having a thickness of 1mm, the impact resistance is not coated with a refractory coating material 14 times. However, the protective coating should not be thicker, because the coating thickness is too thick, although the value to be improved impact resistance, but peeling rate and increases contrast.
Another will be formed into the same protective coating HPL firing kiln, heated to 300 ° ~ 900 ℃, immediately remove, room temperature quench cracking observed state, the results did not HPL surface cracks appear, and subjected to quench after heat shock, flexural strength at 900 ℃ for quench temperature than the unprotected fireproof coating by about 15%. In addition, with protective coating HPL may continue to 1350 ℃ high temperature, life is no protective coating HPL 2 times.
As seen from the fire-resistant protective coating material coated with the furnace, flue and other high temperature refractory material surface under an atmosphere, to form an effective protective layer of refractory material to prevent damage to the substrate, extending its life and reduce maintenance and maintenance times, saving refractories and construction costs, bring significant economic benefits. The protective coating material used in various refractory materials and refractory metal components.