Under certain conditions, metallic materials exhibit exceptionally good elongation, a phenomenon known as superplasticity. Superplastic forming is to use the superplasticity of metal materials to process sheet materials to obtain various required shape parts. The materials mainly include aluminum alloy, magnesium alloy, low carbon steel, stainless steel and high temperature alloy. For example, compared to classic rolling or sheet metal forming, aluminum sheets can be stretched uniformly and very strongly at 450-520°C without causing tensile fractures, localized thinning, or components with internal cavities. For example, this molding technique can be used to produce car fenders and hoods.

The material deformation during superplastic forming is similar to the flow of viscous substances, so the isolation layer between the mold and the metal must be able to separate, lubricate and adhere. Yes, maintaining lubrication while providing adequate adhesion is a challenging balance. Adhesion facilitates forming, while lubrication ensures uniform workpiece thickness while preventing residue. The solution is a boron nitride coating.

The hexagonal boron nitride coating prevents metal parts from sticking to the tool, simplifying the forming and demolding of complex parts. Adhesion is created with a pure inorganic binder, which ensures adequate adhesion and some flexibility even at high temperatures, and also avoids long downtimes caused by time-consuming cleaning steps, thus significantly simplifying the workflow and reduce costs.

Today, superplastic forming has long been extended from metal to ceramic materials, composite materials, intermetallic compounds, etc. In addition to the automotive industry, it has played an irreplaceable role in the production of aerospace, handicraft manufacturing, instrument housing and some complex-shaped components. effect. The ability to develop boron nitride coatings that match different mold and workpiece materials will become a stepping stone for companies to enter the industry.