What is boron nitride ceramics?

Boron nitride ceramics are made from boron nitride powder by hot pressing and sintering, and then processed according to the size and specifications required by customers. Boron nitride, also known as white graphite, is structurally similar to graphite and belongs to a sheet-like hexagonal structure with a theoretical density of 2.27g/cm3 and a Mohs hardness of 2. Has good electrical insulation, thermal conductivity, excellent chemical stability against thermal shock, and good moisture resistance to molten metal, slag, and glass.

Hexagonal Boron Nitride Ceramic Nozzle 3

Properties of boron nitride ceramics

Boron nitride ceramics have excellent machinability and can be machined into complex shapes according to customer requirements with the smallest tolerances.
Boron nitride ceramics are resistant to acid and alkali corrosion, have strong electrical insulation, and have an electrical breakdown resistance that is 3-4 times that of alumina.
Boron nitride ceramics have excellent high temperature resistance, the operating temperature under vacuum is 1800 degrees, and the operating temperature under atmospheric protection is 2100 degrees.
High thermal conductivity of boron nitride ceramics: hot-pressed products are 33W/m.k and pure iron, higher than 530℃ is the thermal conductivity of ceramic materials.

Boron nitride ceramics have strong thermal shock resistance. After being taken out in the air and continuously cooled for hundreds of times, it will not crack in 1500 degree quenching, and will not crack after 20 minutes in a 1000 degree furnace.
Boron nitride ceramics do not react and bond with many metals, ceramics, rare earths and other materials. Such as ferrous metals, iron, copper, stainless steel, bismuth, aluminum, tin, chromium, lead, nickel, magnesium, etc.; glass melt, soda glass, cryolite, etc. Silicon lava: slag, fluoride, etc., can be used as containers, crucibles, combustion plates, etc.

Precautions for the use of boron nitride ceramics

  1. The operating temperature in the air should not exceed 1000 degrees. Boron nitride surfaces in contact with oxygen will oxidize and flake off.
  2. Boron nitride readily absorbs moisture. The crucible cannot be stored in a damp place and cannot be washed with water, but it can be directly wiped with sandpaper or wiped with alcohol.