BORON CARBIDE

Physical and Chemical Composition

 

Atomic Properties

Crystal structure

Rhombohedral

Molecular Weight

55.3 gm/mole

Heat of Formation ΔH298

-13.8 kcal/mol

Specific Gravity

2.54 gm/cc

Specific Heat

12.5 cal/molC

Lattice Energy

6.5 cal/molC

Lattice Constant

ao = 5.60, co = 12.10

Neutron Cross Section

600 Barns

Oxidation Temperature

932F (500C)

Particle Shape

Blocky, Angular

Color

Black, sooty when powdered

Mechanical Properties

Knoop Hardness (100 gm load)

3200

Mohs Hardness

9.3+

Bending Strength

30....50 kg/mm-2

Compressive Strength

200...300 kg/mm-2

Young's Modulus

45,000 kg/mm-2


 

Thermal & Electrical Properties

Melting Point

2450C

Boiling Point

3500C

Thermal Expansion

5 x 10-6/C

Thermal Conductivity 25

.07...0.16 cal/cm-secC

Electrical Resistivity 25

.01...10 ω-cm

Infrared Absorption Bands

9.5; 12.5

EMF

80 . V ./C

Typical Chemical Analysis

Total Boron

77.5%

Total Carbon

21.5%

Total Iron

0.2%

Total B+C

98%

Grit Sizes Available

ANSI/ISO Grit Sizes:

60, 70, 80, 90, 100, 120, 150, 180, 220, 240,

FEPA Grits

F4, F5, F6, F7, F8, F10, F12 F14, F18, F20, F22, F24, F30, F36, F40, F46, F54, F60, F70, F80, F90, F100, F120, F150, F180, F220, F230, F240, F280, F320, F400, F500, F600, F800, F1000, F1200

Ceramic Grades (Air classified)

-100, -200, -325, -400, -25 , -10 , -7 , -5 , -1

Ceramic Group Sizes

63-50 , 50-40 , 40-28 , 28-20 , 20-14 , 14-10 , 10-7 , 7-5 , 5-3.5 , 3.5-2.5 , 60-150 mesh, 46-120 mesh

The information contained in this data sheet has been determined through the application of accepted engineering practice and is believed to be reliable. Since the conditions of application and use of our products are beyond our control, no warranty is expressed or implied regarding accuracy of the information, the test results to be obtained from the use of the product, or that such use will not infringe on any patent. This information is furnished with the express condition that you will make your own tests to determine the suitability of the product for your particular use.

 

 

 

 

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