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BORON CARBIDE POWDERS AND GRAINS AS FILLERS, BORON SOURCES AND SINTERING AIDS

BORON CARBIDE (B4C) POWDERS AND GRAINS AS FILLERS, BORON SOURCES AND SINTERING AIDS

ESK has been a manufacturer of boron carbide (B4C) since 1940, and is now the biggest producer in the western world.
TETRABOR« boron carbide belongs to the most important group of non-metallic hard materials. By virtue of the manufacturing process, TETRABOR« has a constant high purity. It contains almost the exact theoretical ratio of boron to carbon of 4.3. TETRABOR« boron carbide is available in narrow ranges of grain sizes and grain mixtures (approx. 1 to 20 000 Ám). Thanks to their versatility, our powders are characterized by excellent properties, such as:

  • Extreme hardness
  • High chemical resistance
  • Outstanding heat resistance
  • High boron content

Applications

  • Precursor for the production of boron halides and metal borides (e.g. Boron Trichloride BCI3)
    The high boron content of almost 80 % makes TETRABOR« boron carbide an inexpensive boron source.
  • Sintering and hot pressing powder for the manufacture of sintered boron carbide parts
    TETRABOR« boron carbide is ideally suited thanks to its high chemical purity and constant delivery quality.
    It has virtually the theoretical density of 2.51 kg/m3
  • Filler for polymers, metals, concrete, etc.
    For absorption and particle reinforcement
  • Constituent of electrode materials for wear protection
    The extreme hardness of TETRABOR« boron carbide (9.5+ N/mm2 Mohs scale) makes it ideally suited for wear protection in welding and thermal spraying.
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Boron Carbide
Material properties Norm Symbol/Unit TETRABOR®
Density DIN EN 623-2 ρ [g/cm3] >2.48
Porosity DIN EN 623-2 P [%] <0.5
Mean grain size [μm] <10
Phase composition B4C, C
Vickers hardness DIN EN 843-4 HV 1 [GPa] 26
Knoop hardness DIN EN 843-4 HK 0.1 [GPa] 27
Young's modulus DIN EN 843-2 E [GPa] 410
Weibull modulus DIN EN 843-5 m 15
Flexural strength, 4-pt bending DIN EN 843-1 σB [MPa] 460
Compressive strength DIN 51104 σD [MPa] >2800
Poisson ratio DIN EN 843-2 ν 0.18
Fracture toughness (SENB) Klc [MPa·m0,5] 5
Coefficient of thermal expansion DIN EN 821-1
25°C - 500°C α [10-6/K] 4.5
500°C - 1000°C α [10-6/K] 6.3
Specific heat at 25°C DIN EN 821-3 cp [J/g K] 0.94
Thermal conductivity at 25°C DIN EN 821-2 λ [W/m K] 36
Thermal stress parameters calculated
R1 = σB·(1-ν) / (α·E) [K] 204
R2 = R1·λ [W/mm] 7
Specific electrical
resistance at 25°C
DIN EN 50359 ρ [Ω cm] 1