Steel refractory coating for LFC process

Application

High-speed mix: Dosage Coatings:Water = 1:0.65 to 0.68.  Add water into bucket until immerse the fans, set stirring speed to 400 r/min and add coatings slowly. After all coatings added, transfer the speed to 600r/min, keep stirring for 2 hours.  Look into the state of the coatings slurry, the coating slurry’s baume degree should be between 65 to 73 degrees, and then keep stirring for 1 hour in 400 r/min. Operators should make daily records, from which to find optimal dosage of water and coatings.

Foam-pattern is coated by dipping. Should be considered, cast iron coating material is very sensitive to shear stress - that is, its viscosity will vary according to the speed of mixing. Therefore, the weight of the slurry deposited on the surface of the foam model when immersed is affected by the stirring force. To order to get good quality castings, it shall have a good control of the stirring speed and baume degrees. We recommend to dip as stirring. Some plants may be continuously stirred for some time, then dip. In the period of time after the mixing just stopped, the viscosity will increase rapidly, and then gradually stabilized. In addition, the immersion speed of the model, the time to stay, and the speed of removal are also very important. For complex castings, molds should be designed so that the bubbles do not remain in the dip. It is also advisable to deal with the dip-coated model, which is too strong to drip on the original uniform coating.