HBN boron nitride plate for precision glass molding

In traditional glass production, graphite is commonly used as a mold material, but it has the following disadvantages: it is prone to wear and oxidation at high temperatures, reducing its lifespan; it has a high coefficient of thermal expansion, resulting in instability in mold precision and dimensions, requiring more frequent adjustments; the surface of graphite has adsorptive properties, leading to adhesion of glass to the mold; in extreme conditions, it has low strength and durability, lacking sufficient strength and durability for high-pressure or high-impact glass molding processes. Coating graphite molds with materials like boron nitride can improve their heat resistance and reduce adhesion, but there are still risks of coating detachment and shorter lifespan.

Hot-pressed hexagonal boron nitride (hBN) is suitable for molds in the production of precision glass products due to the following properties:

1. High temperature resistance: Hexagonal boron nitride can maintain structural stability in high-temperature environments, enabling molds to withstand the thermal stress of high-temperature glass melting and shaping processes, thereby extending their lifespan.

2. Low adhesion: Boron nitride surfaces have low adhesion, reducing the adhesion and retention of glass to the mold. This helps improve production efficiency and reduce the frequency of cleaning and maintenance.

3. Low coefficient of thermal expansion: Hexagonal boron nitride exhibits relatively stable dimensions at high temperatures, facilitating mold size stability and precision control.

4. High chemical inertness: Boron nitride can resist corrosion and chemical erosion, prolonging the mold's lifespan.

With advancements in hot-pressed boron nitride technology, it has become an ideal material for glass mold production, reducing surface defects, extending mold lifespan, and facilitating mold release.

Main properties