Momentive’s boron nitride (BN) composites incorporate BN in proprietary compositions with other refractory materials and are ideally suited for the harsh environments of molten metal applications of non-ferrous and ferrous alloys. These ceramic composites are machinable, thermal shock resistant, and chemically compatible in a wide range of environments.
Composite Grades
- AC6043 — Titanium Diboride/ Boron Nitride
Machinable with better oxidation resistance and improved strength compared to common furnacing materials such as graphite. Used in replacement parts for areas of high oxidation where longer life and much lower erosion rates are needed such as vents, plates, stacks, crucibles, and capsules.
- BIN77 — Aluminum Nitride/ Boron Nitride
Machinable with high mechanical strength and good electrical insulation properties. Resists moisture pickup, spalling, cracking, with good abrasion resistance. Often used in vacuum deposition processes where purity and thermal stability are critical.
Typical
Properties
|
AC6043
|
BIN77
|
Density (g/cc)
|
2.78
|
2.43
|
Flexural Strength
@25°C
@1500°C
|
13,000
2,400
|
18,000
4,000
|
Sonic Modulus
(psi x106)
|
15.5
|
4 to 9
|
CTE
(in/in/°Cx10-6)
|
7
|
5 to 6
|
Thermal Conductivity
(W/m°K) @25°C
|
70
|
25 to 40
|