Pyrolytic boron nitride is an anisotropic high-temperature ceramic with high electrical resistance and good thermal conductivity. It is suitable for applications requiring high strength, low thermal expansion coefficient and good thermal shock resistance. Pyrolytic boron nitride also has thermal shock resistance and is a superior sealant that protects graphite from corrosive environments, such as most molten metals, acids, and hot ammonia environments. It has been verified that pyrolytic boron nitride is also a very effective insulating material. Pyrolytic boron nitride is non-toxic and harmless under normal conditions, has no porosity, and has high purity, so it is easy to store and easy to process into crucibles, evaporation boats, plates, pipes, bottles and other utensils.
Pyrolytic Boron Nitride (PBN) belongs to the hexagonal crystal system. It is an advanced ceramic material with a purity of 99.999%, acid and alkali resistance, oxidation resistance, good thermal conductivity, compactness, and processing. It is formed by chemical vapor deposition (CVD) of ammonia and boron halides under high temperature and high vacuum conditions. It is different from ordinary hot-pressed boron nitride (BN). It does not need to go through the traditional hot-pressed sintering process. Add any sintering agent, so the obtained product has the following remarkable characteristics:
-Non-toxic and odorless;
-High purity, up to 99.999%;
-It does not react with acids, alkalis, salts and organic reagents at room temperature, and slightly corrodes in molten salt and lye, but it can resist the corrosion of various acids at high temperatures;
-Does not react with most molten metals, semiconductors and their compounds;
-Below 1000℃, good oxidation resistance;
-Good thermal shock resistance, no cracks are found when thrown into water at 2000℃;
-High operating temperature, no sublimation point, directly decomposed into B and N above 3000℃;
-High resistance, good electrical insulation performance;
-Smooth surface, no pores, and non-wetting with most semiconductor melts.
Applications of PBN
-OLED evaporation unit
-Semiconductor single crystal growth (VGF, LEC) crucible
-Molecular beam epitaxy (MBE) evaporation crucible
-MOCVD heater
-Polycrystalline synthesis boat
-PBN infrared window
-Satellite communication microwave tube
-PBN coated carrier plate
-Insulation board for high temperature and high vacuum equipment