EKasic®

Silicon Carbide - A versatile specialist

Product leaflets (472 kB)

EKasic® Silicon Carbide

(technical data)

Technical data sheets (232 kB)

EKasin® S Silicon Nitride

(technical data)

Technical data sheets 2 (44 kB)

Corrosion resistance

of EKasic^{^®}, EKasin^{^®} and TETRABOR^{^®}

Technical data sheets 3 (263 kB)

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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.

EKasic^® SILICON CARBIDE AND EKasin^® SILICON NITRIDE GAS SEAL RINGS

For sealing compressors, gas-lubricated mechanical seals have proven to be the most economical solution. They operate on the basis of the contact-free relative movement of the rotor and stator at extremely high speeds and with a minimum gap size. Microstructures introduced into the running surface provide the “air cushion” that allows contact-free rotation. The crucial advantages are no maintenance and minimum leakage:

For this application, ESK offers EKasic^® silicon carbide (SiC) or EKasin^® silicon nitride (Si₃N₄) gas seal rings for use in gas-lubricated mechanical seals.

EKasic^® T Gas Seal Rings

EKasic^® T gas seal rings from ESK offer an impressive combination of properties:

High mechanical strength
Excellent thermal conductivity
High stiffness
Corrosion resistance

EKasin^® Gas Seal Rings

Special high-performance applications can be implemented with the use of EKasin^® S (silicon nitride) for the gas seal rings from ESK.

Custom Modifications

As additional services, ESK can microstructure the gas seal rings and perform DLC coating for the start-up phase to customer specifications.

			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	σ_B [MPa]	400	510	550
Compressive strength		σ_D [MPa]	2200	2200	2500
Poisson ratio		ν	0.17	0.17	0.16
Fracture toughness (SENB)		K_lc[MPa·m^0,5]	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	c_p [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 = σ_B·(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	σ_B [MPa]	400	225	230
Compressive strength		σ_D [MPa]	2500	2000	2500
Poisson ratio		ν	0.17	0.17	0.16
Fracture toughness (SENB)		K_lc[MPa·m^0,5]	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	c_p [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 = σ_B·(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

			Silicon Nitride
Material properties	Norm	Symbol/Unit	Ekasin^®S
Density	DIN EN 623-2	ρ [g/cm³]	>3.24
Porosity	DIN EN 623-2	P [%]	<0.5
Mean grain size		[μm]	<2
Aspect ratio (L/D)			3-5
Phase composition			β-Si₃N₄, Oxide
Vickers hardness	DIN EN 843-4	HV 1 [GPa]	14
Knoop hardness	DIN EN 843-4	HK 0.1 [GPa]	13.5
Young's modulus	DIN EN 843-2	E [GPa]	300
Weibull modulus	DIN EN 843-5	m	15
Flexural strength, 4-pt bending	DIN EN 843-1	σ_B[MPa]	700
Compressive strength		σ_D[MPa]	>2500
Poisson ratio		ν	0.25
Fracture toughness (SENB)		K_lc [MPa·m^0,5]	7
Coefficient of thermal expansion	DIN EN 821-1
20°C - 500°C		α [10^-6/K]	2.0
500°C - 1000°C		α [10^-6/K]	4.0
Specific heat at 20°C	DIN EN 821-3	c_p [J/g K]	0.7
Thermal conductivity at 20°C	DIN EN 821-2	λ [W/m K]	25
Thermal stress parameters	calculated
R₁ = σ_B·(1-ν) / (α·E)		[K]	875
R₂ = R₁·λ		[W/mm]	22
Specific electrical resistance at 20°C		ρ [Ω cm]	>10¹¹