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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 µm). 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 2510 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] <15
Aspect ratio (L/D) -
Phase composition B4C, C
Vickers hardness DIN EN 843-4 HV 1 [GPa] 31
Knoop hardness DIN EN 843-4 HK 0.1 [GPa] 29
Young's modulus DIN EN 843-2 E [GPa] 420
Weibull modulus DIN EN 843-5 m 15
Flexural strength, 4-pt bending DIN EN 843-1 σB [MPa] 450
Compressive strength σD [MPa] >2800
Poisson ratio ν 0.15
Fracture toughness (SENB) Klc [MPa·m0,5] 5
Coefficient of thermal expansion DIN EN 821-1
20°C - 500°C α [10-6/K] 4.5
500°C - 1000°C α [10-6/K] 7.2
Specific heat at 20°C DIN EN 821-3 cp [J/g K] 1
Thermal conductivity at 20°C DIN EN 821-2 λ [W/m K] 40
Thermal stress parameters calculated
R1 = σB·(1-ν) / (α·E) [K] 202
R2 = R1·λ [W/mm] 8
Specific electrical
resistance at 20°C		 DIN EN 50359 ρ [Ω cm] 1