Boron Nitride- Hot Pressed

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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-1oC-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-1oC-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