Boron Nitride Ceramic Coatings
WhiteGuard and BlueGuard are water-based boron nitride ceramic coatings for molten metal application. The only difference in these products is that BlueGuard is color-tinted. This allows the user to better see the coating on white surfaces and to identify spots for occasional patching. Two formulations are available in 107 and 207. 107 is ready to use, not requiring diluting. 207 is packaged at a higher density suspension that can be diluted from 1:1 to 1:3 ratio depending on the process, material to cover, and surface temperature.
Properties
Both WhiteGuard and BlueGuard are non-wetted by molten aluminum, magnesium, zinc, copper, and their alloys. It is also chemically resistant to dross, fused fluxes, and glass. In addition, the dried coating is highly thermo-conductive and chemically inactive at temperatures well above the melting point of non-ferrous metals.
Application Methods
WhiteGuard and BlueGuard can be applied the same way as household paint. Before using, stir the boron nitride coating to achieve a homogeneous condition. Then, the product can be applied by spraying (regular paint nozzle), brushing, or rolling. One layer is usually enough, but a second application might be required for metallic surfaces or high-density ceramics.
Metalcasting Use
- Analytical sample ladles, skimmers, t/s protection tubes, etc. made of cast iron and steel
- Castable refractories used for the lining of molten metal-containing and delivery systems; troughs, launders, distributors, CFF bowls
- Marinite, calcium silicate, and other refractory materials
- Engineered ceramic parts in contact with molten metal
- Fused silica parts used for metal distribution and flow control