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  Crucible is a cup-shaped vessel used in the chemical industry, which was first used in alchemy experiments and is used to hold liquid or solid for high temperature heating, which is the basis for ensuring the smooth progress of chemical reactions. Crucible material requirements heat resistance, strong, and at high temperatures are not easy to chemical reaction, the earliest crucible in history is made of clay, development to modern times has been able to melt or change its contents of any material, such as  quartz ceramics , corundum,  boron nitride ,  zirconia , graphite and platinum, nickel, chromium and other metals. Boron Nitride is an advanced ceramic material with broad application prospects, which is composed of nitrogen atoms and boron atoms crystal, chemical composition of 43.6% boron and 56.4% nitrogen, with four different variants: Hexagonal boron nitride (HBN), cubic boron nitride (CBN), Rhombic boron nitride (RBN), wurtzite boron nitride (WBN). ...