Temperature Instrumentation for Research and Industry

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Protecting Tubes - Small Diameter Silicon Carbide

SA SiC is produced by pressureless sintering sub micron silicon carbide powder. The sintering process results in a self-bonded, fine grain SiC product which is highly resistant to corrosion, erosion, high temperature and thermal shock.
CORROSION RESISTANCE
SA SiC has superior corrosion resistance than alumina and other refractory materials in environments of hot gases and liquids, including strong acids and bases.

EROSION RESISTANCE
SA SiC is 50% harder than tungsten carbide. This extreme hardness combined with high purity and fine micro structure makes SA SiC resistant to erosion under abrasive conditions.

HIGH TEMPERATURE PROPERTIES
The single phase composition of SA SiC enables it to reliably perform in air up to temperatures of 1650°C (3000°F). It contains no free silicon which makes it highly chemical resistant in both oxidizing and reducing environments.

THERMAL SHOCK RESISTANCE
Because of its high thermal conductivity and low coefficient of thermal expansion, SA SiC is very resistant to thermal shock and thermal cycling as compared to other refractory materials.

SA SiC tube


Material Tube Size
I.D x O.D.		 Part Number
(A = End Option and B = Length)
SA SiC 1/4" x 3/8" SA-375-A-B
1/2" x 3/4" SA-750-A-B
1/2" x 1" SA-1000-A-B
  1. Standard diameter to tolerance for size variation and out-of-roundness is +/-5%
  2. Camber tolerance is 1/16" per foot.
  3. Plain end "A" is 0: i.e., SA-750-0-12".
  4. Optional 3/4" NPT steel fitting "A" is 1: i.e., SA-750-1-12". Additional cost.
Physical Properties Units Typical Values
SA
Composition (phases) - SiC
Density G/cm3 3.10
Grain Size microns 4-6
Hardness (Knoop) - 2800
Flexural Strength
4pt @ RT		 MPa
x103lb/in2		 460
60
Compressive
Strength @ RT		 MPa
x103lb/in2		 3900
560
Modulus of
Elasticity @ RT		 GPa
x106lb/in2		 410
59
Weibull Modulus
(2 parameters)		 - 10
Poisson Ratio - 0.14
Fracture Toughness @ RT
Double Torsion & SENB		 MPa/m
x103lb/in2/sqrt in.		 4.60
4.20
Coefficient of
Thermal Expansion
RT to 700°C		 x10-6mm/mm°K
x10-6in/in°F		 4.02
2.20
Max. Service
Temperature (air)		 °C
°F		 1650
3000
Mean Specific Heat @RT J/gm°K 0.67
Thermal Conductivity
@RT


@200°C


@400°C


 W/mK
BTU/ft h°F		 125.6
72.6

102.6
59.3

77.5
44.8
Permeability, RT to 1000°C Impervious to gases over 31 MPa.
Electrical Resistivity
@RT
@1000°C		 ohm-cm
102 - 106
0.01 - 0.2
Emissivity - 0.9

For more information regarding Protecting Tubes
Consult your Marlin Catalog.