Boron Nitride (BN)
Boron Nitride (BN) coatings have a number of unique properties that make them suitable for a variety of industrial applications. Boron Nitride combines features such as electrical insulation, thermal conduction, and high-temperature lubricity. It is inert to and not wet by most molten metals and salts.
BN coatings provide the potential benefits of BN including excellent lubricity, non-wetting, and high temperature stability, in various, typically easy-to-apply media for a wide range of potential applications. They are often used as release agents, lubricants, and protective coatings. Potential applications include metal processing, glass making, plastic/rubber processing, sintering, welding and brazing.
Release Agents, Lubricants, and Protective Coatings
Boron nitride generally remains lubricious and inert even at extremely high temperatures. Coatings made with BN have been shown to prevent sticking to help increase the life of dies/molds, help improve product surface finishes, and help reduce production times.
In molten metal processing and metalforming applications, BN coatings protect surfaces which come into contact with hot and molten metal. BN generally inhibits corrosion and chemical attack and typically provides easier release and longer mold/die life. Potential applications include casting, stamping, forging, extrusion, and powder metallurgy.
Boron nitride's high temperature lubricating properties make it an excellent candidate to consider in glass making, where it generally helps to minimize surface defects, to improve mold/die life and release, and to reduce clean-up time. Most glass formulations will not stick to BN.
Plastic/Rubber: Producers of injection-molded plastics and elastomers may benefit from BN in die and molding applications. Boron nitride generally can improve die release and increase production speeds.
Sintering of metallic and ceramic powders is typically done on graphite plates. A coating of BN can virtually eliminate carbon contamination, reactivity and sticking - all of which can occur at sintering temperatures.
Welding and Brazing
Boron nitride coatings are excellent candidates for welding and furnace brazing. They typically protect surfaces from weld spatter and generally provide superior stop-off protection. BN coatings may also protect MIG/MAG welding nozzles from weld spatter.
Typical characteristics of Boron Nitride:
Low dielectric constant and loss
High temperature stability