Richards Thermocouple and Temperature Sensor Catalog 16

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Silicon Carbide - Oxide Bonded
Silicon Carbide (SC) protection tubes have a maximum service temperature of 2730°F (1500°C). Silicon Carbide tubes are not gas tight. They
are about 14% porous. Silicon Carbide also has good thermal shock and corrosion resistance and has excellent thermal conductivity. Because
of this they are best used as a secondary protection tube to protect Mullite or Alumina primary tubes from direct flame impingement. Silicon car-
bide tubes are also frequently used in oxygen atmosphere furnaces and in molten non-ferrous metals such as Aluminum, since they are very
resistant to oxidation and slag attack.
Composition: 89.6% Silicon Carbide (Black, coarse grained Alpha / Beta mix), 8.5% Silicon Dioxide, .7% Aluminum Oxide,
.7% Iron Oxide.
Silicon Carbide - Nitride Bonded
Nitride bonded silicon carbide tubes ( SCN) have the same characteristics as oxide bonded silicon carbide with a few exceptions. The have a
maximum service temperature of 2800°F (1500°C). Nitride bonded tubes are more dense and less porous than oxide bonded tubes. They also
have slightly better thermal shock, corrosion resistance, and twice the crushing strength of the oxide bonded tubes.
Composition: 75.0% Silicon Carbide (Black, coarse grained Alpha / Beta mix), 23.4% Silicon Nitride, .5% Silicon Dioxide, .3%
Aluminum Oxide, .3% Iron Oxide.
Part Inches Millimeters
Number O.D. I.D. O.D. I.D. Mounting Figure
SCP-*
SCNP-*
1 3/4 1 44.5 25.4 Plain Tube
SCB-*
SCNB-*
1 3/4 1 44.5 25.4
Bushing
2” NPT x 3/4” FNPT
Cement on
SCC-* 1 3/4 1 44.5 25.4
Collar
3” O.D. x 1” wide
SCCP20-*
SCNCP20-*
SCCP24-*
1 3/4 1 44.5 25.4
Coupling
1 1/4” FNPT
1 1/4” FNPT
1 1/2” FNPT
SCF-*
SCNF-*
1 3/4 1 44.5 25.4
Fitting
3/4” NPT female
SCRB-*
SCNRB-*
1 3/4 1 44.5 25.4
Reversed
Bushing
2” Male NPT
SCFL-*
SCNFL-*
1 3/4 1 44.5 25.4
Mounting Flange
Steel Mounting Flange
attached to tube having
a collar (Tube and
flange are shipped dis-
assembled)
3
4
5
2
1
6
7
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Ceramic Tubes - Silicon Carbide, Silicon Carbide Isopressed
Manufacturing, Engineering and Sales Since 1938
Phone: 617.527.4385 Fax: 617.964.3746 Email:
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