Properties, Application and Synthesis Methods of boron nitride Powder: A Review

h-BN is a multipurpose ceramic material, with exceptional properties and a wide area of application in industry. It is structurally similar to graphite and it resists oxidation to higher temperatures than graphite. It is used in powder form as a mold release agent in metal casting, as a high temperature lubricant or even in cosmetics. hBN can be shaped by hot-pressing and is used as molds or crucibles for liquid metal handling and as electrical insulator parts . Consumption of hBN has increased in the last decades as a result of its unique properties and its utilization in composite materials . hBN reduces the thermal expansion and friction coefficients, increases thermal conductivity and use temperatures of polymer matrix composites. hBN has also been widely used in ceramic matrix composites to improve thermal shock resistance and machinability . One of the uses of this material in the military industry is in the discussion of bullets and Khan light gun pillows that act as a friction and deviation reducer and increase the speed and point of a higher level as a coating on the surface of the bullet or Khan's gun barrel. Because of the high consumption of this ceramic, various inexpensive methods are under investigation. This paper covers a variety of methods for synthesizing hexagonal nitride powder with an emphasis on the carbetermal method and, in brief, the synthesis of other forms of boron nitride, such as hollow spheres, nanoparticles, nanoparticles, and two-dimensional nanostructures.