Boron Nitride (BN) Aerosol Lubricoat® and other refractory aerosol coatings are available in easy-to-use aerosol cans. These are quite useful for investigating whether BN coatings will solve the problems that are being considered. The 12-oz. aerosol can allows the application of a thin, uniform, quick-drying layer of BN onto most any substrate -- typically ceramics, graphite, or metal but also even possible with plastics, wood, etc. The BN coating that results is useful from cryogenic temperatures all the way to very extreme high temperatures (1000 C in air; 1400 C in vacuum; 1800 C or higher in reducing or inert).
Boron nitride itself is a very unique material. Called "white graphite" due to its similarity to graphite, it is much more oxidation resistant than graphite -- thus its much higher use-temperature in air (1000 to 1100 C for BN versus only around 500 to 600 C for graphite). Boron nitride is electrically insulating to its use-limits, while being transparent (non-heating/non-absorbing) to microwave energy and having a dielectric strength about four times that of aluminum oxide. Compared to other ceramic materials, BN is quite thermally conductive (with its conductivity about equal to that of stainless steel). Major uses for boron nitride arise from its stability and compete lack of attack and total nonwetting in contact with molten aluminum, magnesium, zinc, and other nonferrous metals and alloys. BN is also very resistant to molten glasses and is often used to aid in the forming process for glasses. The lubricity of boron nitride is remarkable throughout its useful temperature range and in all environments (unlike graphite which loses its lubricity in vacuum): this property of BN leads to its uses in areas of metal extrusion, plastic extrusion, hot-pressing of metals and ceramics, and isothermal (superplastic) forming of superalloys. Uses for stop-off areas, like with brazes or weld spatter, provide anti-stick and release. BN is also useful for its chemical resistance to molten salts and slags, as well as with many other reactive materials.
Thus, with the availability of Boron Nitride Aerosol Lubricoat®, quick testing is possible in many areas. After initial testing, if the customer wishes to change to water-based coatings, ZYP Coatings, Inc. has a wide-variety of coatings to choose from. On the other hand, the customer may wish to continue to enjoy the ease-of-use and quick-dry characteristics of the aerosol cans. However, if scale-up indicates that the material should be brush-applied or applied by industrial spray equipment, ZYP Coatings offers the boron nitride aerosol formulation in bulk (paint) form -- suitable for application by brushing or traditional air-spraying as well as other housepaint-like ways of coating (dipping, rolling, etc.).
In addition to boron nitride, other aerosol refractory materials are offered by ZYP Coatings, Inc. -- yttrium oxide (yttria); zirconium oxide (zirconia); aluminum oxide (alumina); titanium nitride. These have the character of the individual refractory component and thus provide a wide variety of properties that can solve most any need for a thin layer of these materials. The 13-oz. aerosol cans and bulk (paint) forms are available.