In 1979, Sokolowski successfully prepared cubic boron nitride (CBN) films using pulsed plasma technology at low temperatures and pressure. The equipment used is simple and easy to implement, so it has been rapidly developed. Various vapor deposition methods have emerged. Traditionally, it mainly refers to thermochemical vapor deposition. The experimental device generally comprises a heat-resistant quartz tube and a heating device. The substrate can be heated by a heating furnace (hot wall CVD) or high-frequency induction heating (cold wall CVD). The reaction gas decomposes on the high-temperature substrate surface and undergoes a chemical reaction to deposit a film. The reaction gas includes a mixture of BCl3 or B2H4 and NH3. Hydrothermal synthesis method: This method uses water as the reaction medium in an autoclave's high-temperature and high-pressure reaction environment to dissolve commonly insoluble or insoluble substances. The reaction can also undergo recrystallization. Hydrothermal technology has two characteristics, one is its relatively low temperature, and the other is that it is conducted in a closed container to avoid component volatilization. It synthesizes cubic boron nitride at low temperatures as a low-temperature and low-pressure synthesis method. Benzene thermal synthesis: As a newly developed method for synthesizing low-temperature nanomaterials, benzene thermal synthesis has received widespread attention. Due to its stable conjugated structure, benzene is an excellent solvent for solvothermal synthesis. Recently, it has been successfully developed into a benzene thermal synthesis technology, with a reaction temperature of only 450 ℃. The benzene thermal synthesis technology can prepare metastable phases that are usually designed under extreme conditions and exist under ultra-high pressure at relatively low temperatures and pressures. This method realizes the preparation of cubic boron nitride at low temperatures and pressure. However, this method is still in the experimental research stage and is a promising synthesis method. If you are looking for high quality, high purity and cost-effective copper oxide, or if you require the latest price of copper oxide, please feel free to email contact mis-asia.
