Hexoloy® SiC Process Tubes

Sintered Silicon Carbide Process Tubes

Hexoloy® SA sintered silicon carbide is an excellent material choice for ‘process’ tubes in a wide range of thermochemical environments. Special features such as holes or slots can also be added to process tubes to facilitate fluid flow.

Features and Benefits

Benefits
  • High oxidation resistance - up to 1,650°C in air
  • Excellent corrosion resistance against a wide range of chemicals
  • High mechanical strength, erosion and abrasion resistance
  • Superior resistance to thermal cycling
Application
  • Process tubes
  • Sparger tubes
  • Sensor tubes
Material Properties

Typical Properties of Hexoloy® SA

Property Units Typical Value
Composition* - SiC
Grain Size µm 4.10
Density g/cm3 3.10
Hardness (Knoop)** kg/mm2 2,800
Flexural Strength 4 pt @ RT***

MPa

x103 lb/in2

380

55

Flexural Strength 3 pt @ RT***

MPa

x103 lb/in2

550

80

Compressive Strength @ RT

MPa

x103 lb/in2

3900

560

Modulus of Elasticity @ RT

GPa

x106 lb/in2

430

62

Weibull Modulus (2 parameter)   10
Poisson Ratio   0.14

Fracture Toughness @ RT

Double Torsion & SENB

MPa x m1/2

x103 lb/in2 x in1/2

4.60

4.20

Coefficient of Thermal Expansion

RT to 700°C

x10-6 mm/mmK

x10-6 in/in ˚F

4.02

2.20

Maximum Service Temp. Air

°C

°F

1,900

3,450

Mean Specific Heat @ RT J/gmK 0.67

Thermal Conductivity @ RT

@ 200°C

@ 400°C

 

 

 

W/mK

Btu/ft h °F

W/mK

Btu/ft h °F

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

ohm-cm

102 - 108

0.01 - 0.2

Emissivity   0.9
Size

Tube diameters can range from 25 mm to 381 mm with lengths up to 1.4 m. Longer tubes (up to 4.9 m) are available as assemblies using a proprietary bonding process. 

Process tubes may also be manufactured via extrusion (Hexoloy® SE) for applications requiring long tubes (up to 5 m) without joints.