Richards Thermocouple and Temperature Sensor Catalog 16

Manufacturing, Engineering and Sales Since 1938

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Phone: 617.527.4385 Fax: 617.964.3746 Email: sales@asrichards.com

Ceramic Tubes - Silicon Carbide, Silicon Carbide Isopressed

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

*

1

SCP-*

Plain Tube

1 3/4

1

44.5

25.4

SCNP-*

Bushing

*

2

SCB-*

2” NPT x 3/4” FNPT

1 3/4

1

44.5

25.4

SCNB-*

Cement on

*

3

Collar

SCC-*

1 3/4

1

44.5

25.4

3” O.D. x 1” wide

Coupling

*

4

SCCP20-*

1 1/4” FNPT

1 3/4

1

44.5

25.4

SCNCP20-*

1 1/4” FNPT

SCCP24-*

1 1/2” FNPT

Fitting

5

SCF-*

1 3/4

1

44.5

25.4

3/4” NPT female

SCNF-*

Reversed

6

SCRB-*

Bushing

1 3/4

1

44.5

25.4

SCNRB-*

2” Male NPT

Mounting Flange

*

7

Steel Mounting Flange

SCFL-*

attached to tube having

1 3/4

1

44.5

25.4

SCNFL-*

a collar (Tube and flange are shipped dis- assembled)

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