Ads by Google
Nitride Crucible Gasket
Boron Nitride Solids are made by hot pressing hexagonal Boron Nitride powders. The color of BN products is milky, true density is 2.27g/cm , Mohs value is 2, they have a high melting point(sublimate point is 3000°C). When in a condition of inert atmosphere, their maximum service temperature can reach to 2800°C. Their thermal conductivity is 25W/(m·K), similar to stainless steel.And coefficient of liner And coefficient of liner expansion is between 2.0×10 /°C to 6.5×10 /°C. They have a high quality of heat-resistance and shock-resistance, and they can work efficiently after several hundred of 1000°C←→20°C cycles. Their oxidation resistance is poor, and their chemical properties are stable, they have a high corrosion-resistance of acid, alk, molten metal and glass. BN products cannot have chemical reaction with most molten metals, such as Cu, stainless steel, Fe, Sn, Zn and Sb. Mechanical strength is low, just a little more than that of graphite, volume resistance is between 25~1050°C,10-6~10-6n·cm, they are good insulators. Electric breakdown strength is between 30 kV/cm to 40 kV/cm, which is three times than that of aluminum oxide. Thermo compression products are distinctly anisotropic, they can be used to finish cut, and the precision of lathe can reach to 0.01mm.
Thermal Conductivity | (40-50)W/m·k | |
Thermal expansivity | (6.5-7.5)*10-6 °C | |
Resistivity | >1012 Ω·m | |
Puncture voltage | (2.5-4.0)*106 /kv·m | |
Mohs' hardnees | 2 | |
Dielectric constant | 3.8-4.3 | |
Bending strength | >35mpa | |
Compression strength | >200mpa | |
Density | 1.9—2.2 g/cm3 | |
Chemical Composition | B+N | 99.5% |
Oxygen Content | <0.4% | |
Carbon Content | <0.02% | |
Working Environment Temperature | Oxidizing Atmosphere | 850°C |
Vacuum | 1800°C | |
Inertia | 2300°C | |
Process characteristics:
Combat solids display a unique combination of chemical, electrical , thermal and mechanical properties to offer improved process performance and increased service life while enabling new technologies:
Easily merchantable to desirable shapes and size Exceptional conductivity High thermal conductivity Excellent thermal shock resistance; Outstanding electric insulation-even at high temperatures High wet resistance to molten metals, slags and glass Extreme corrosion and wear resistance
PENSC offers machined parts or blanks
Industry leading turn around time for prototypes and production quantities according to your specifications.
Market and Application
Boron Nitride Solids fit a variety of applications in high-performance material processing environment.
Typical Markets
Steel mills and foundries; Furnace construction; Semiconductor Industry; Coating applications;
Typical Applications
Side dams in thin-strip casting process Break rings in horizontal continuous casting Insulators for high-temperature furnaces Crucibles and containers for molten metals Nozzles for metal atomization
The show of our company
suitable for the vaporization of aluminum, having a multi-walled structure comprising an outer wall and a thinner inner wall weakly bonded to the thicker outer wall. Because of this structure, the crucible is considerably more flexible than conventional single-walled crucibles and exhibits substantially improved thermal cycling characteristics and longer life. The crucible is produced by depositing pyrolytic boron nitride upon a mandrel having the shape of the desired crucible at a temperature of from about 1850° C. to about 2100° C. until a first layer of boron nitride of suitable thickness has been produced, interrupting the deposition of boron nitride upon the mandrel and lowering the temperature to below 1750° C., and then depositing additional boron nitride upon the mandrel at a temperature of from about 1850° C. to about 2100° C. to produce a second outer layer of boron nitride having a thickness greater than that of the inner layer.