Boron Nitride- Hot Pressed
Grade: HBR
Typical Analysis in Percentage:
B 42 - 43.8
N 52.7 - 54.1
O(max) 3.9
C <0.1
Ca(min) 0.8
Other(max) 0.05
Density (Minimum): 1.90 g/cm3
Specific Heat: 0.441 (Cal ⋅ g-1 ⋅ oC-1 @ 700 oC)
Max Recommended Operating Temperature (Oxidizing Atmosphere): 850 oC
Max Recommended Operating Temperature (Inert Atmosphere or Vacuum): 1100 oC - 1600 oC
Parallel Perpendicular
To Pressing To Pressing
Direction Direction
Electrical Properties:
Volume Resistivity @ R.T. (Ω -cm): 1 x 1013
Dielectric Constant: 4.6 4.2
Loss Tangent @ 8GHz: .00055 .00053
Thermal Conductivity (Cal ⋅ cm-1 ⋅sec-1 ⋅ oC-1):
@ 25 oC: 0.13 0.08
@ 500 oC: 0.08 0.06
@ 800 oC: 0.07 0.05
Coefficient of Thermal Expansion:
RT to 1200 oC (in/in oC x 10-5): 1.0 2.0
Flexural Strength (psi):
@ 25 oC: 6,000 7,500
@ 1500 oC: 2,700 3,100
Modulus of Elasticity:
(106 psi): 9 7
Compressive Strength:
(psi): 8,700 9,200