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EKasic® SILICON CARBIDE SEALS, ROTARY UNIONS

EKasic® SILICON CARBIDE SEALS FOR ROTARY UNIONS

Rotary unions allow liquids or gases such as hydraulic fluid, cooling lubricants or air to be fed from a stationary feed system into a rotating unit. For such challenging machine elements, we offer high-quality EKasic® SSiC gaskets (sintered silicon carbide) The high quality of the seals makes them ideal for heavy duty applications, especially with contaminated and/or abrasive fluids. They are exclusively custom made by us to customers’ specifications.

The Key to High Speeds

EKasic® seals have a low specific density. It is between 2.80 and 3.20 g/cm3 depending on the material. Very high speeds of up to 50 000 l/min can achieved with very low density and maximum stiffness.

Specifications

EKasic® seals for rotary unions are available from an external dia. of 6 mm.

Typical Rotary Union Applications:

  • Machine-tool spindles
  • Continuous casting lines
  • Calenders for the paper industry
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Silicon Carbide
Material properties Norm Symbol/Unit EKasic®
F		 EKasic®
F plus		 EKasic®
T
Density DIN EN 623-2 ρ [g/cm3] >3.10 >3.16 >3.21
Porosity DIN EN 623-2 P [%] <3.0 <1.0 <1.0
Mean grain size [μm] <5 <5 <2
Grain size distribution [μm]
Phase composition α-SiC α-SiC α-SiC,
YAG
Vickers hardness DIN EN 843-4 HV 1 [GPa] 25.5 25.5 22.5
Knoop hardness DIN EN 843-4 HK 0.1 [GPa] 24.5 24.5 21.0
Young's modulus DIN EN 843-2 E [GPa] 410 420 420
Weibull modulus DIN EN 843-5 m 10 15 15
Flexural strength,
4-pt bending		 DIN EN 843-1 σB [MPa] 400 510 550
Compressive strength σD [MPa] 2200 2200 2500
Poisson ratio ν 0.17 0.17 0.16
Fracture toughness
(SENB)		 Klc [MPa·m0,5] 4 4 6
Coefficient of
thermal expansion		 DIN EN 821-1
20°C - 500°C α [10-6/K] 4.1 4.1 3.5
500°C - 1000°C α [10-6/K] 5.2 5.2 5.2
Specific heat at 20°C DIN EN 821-3 cp [J/g K] 0.6 0.6 0.6
Thermal conductivity
at 20°C		 DIN EN 821-2 λ [W/mK] 125 125 75
Thermal stress
parameters		 calculated
R1 = σB·(1-ν) / (α·E) R1 [K] 198 246 314
R2 = R1·λ R2 [W/mm] 25 31 24
Specific electrical
resistance at 20°C		 DIN EN 50359 ρ [Ω cm] 106-108 106-108 102-103



Silicon Carbide
Material properties Norm Symbol/Unit EKasic®
C		 EKasic®
P		 EKasic®
G
Density DIN EN 623-2 ρ [g/cm3] >3.10 >2.76-
2.89		 >3.02
Porosity DIN EN 623-2 P [%] <3.0 10-14 <3.0
Mean grain size [μm] bimodal <5 bimodal
Grain size distribution [μm] 10-1500 10-1000
Phase composition α-SiC α-SiC α-SiC,
graphite
Vickers hardness DIN EN 843-4 HV 1 [GPa] 25.5 23.5 24.5
Knoop hardness DIN EN 843-4 HK 0.1 [GPa] 24.5 21.6 23.0
Young's modulus DIN EN 843-2 E [GPa] 410 340 390
Weibull modulus DIN EN 843-5 m 10 15 14
Flexural strength,
4-pt bending		 DIN EN 843-1 σB [MPa] 400 225 230
Compressive strength σD [MPa] 2500 2000 2500
Poisson ratio ν 0.17 0.17 0.16
Fracture toughness
(SENB)		 Klc [MPa·m0,5] 3.5 3 3
Coefficient of
thermal expansion		 DIN EN 821-1
20°C - 500°C α [10-6/K] 4.1 3.5 4.0
500°C - 1000°C α [10-6/K] 5.2 5.6 5.0
Specific heat at 20°C DIN EN 821-3 cp [J/g K] 0.6 0.6 0.6
Thermal conductivity
at 20°C		 DIN EN 821-2 λ [W/mK] 125 90 110
Thermal stress
parameters		 calculated
R1 = σB·(1-ν) / (α·E) R1 [K] 198 157 124
R2 = R1·λ R2 [W/mm] 25 14 14
Specific electrical
resistance at 20°C		 DIN EN 50359 ρ [Ω cm] 103-104 106-108 103-104