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ESK NEWS

Successful quality management system
July 27, 2009

On July 23, ESK Ceramics GmbH & Co. KG successfully passed the surveillance audit of its quality management system to ISO 9001:2008 and 14001:2004. In the audited departments, the two auditors from TÜV Süd were able to satisfy themselves that the ESK quality management system is not only systematically implemented but also developing continuously.

ESK Successfully Recertifies for the Automotive Industry
July 25, 2009

ESK Ceramics GmbH & Co. KG has successfully renewed the certification of its quality management system to ISO TS 16949 in the field of surface engineering. This ESK business division primarily produces high-friction coatings on materials for the automotive industry.

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.
fileadmin/esk/plain/tetrabor_b4c-e.html

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