A New Class of Ceramic for High-Stress Thermal Environments
In industrial furnaces where thermal shock, corrosive gases, and mechanical wear collide, even traditional advanced ceramics like alumina or SiC can reach their performance limits. That’s where silicon oxycarbide ceramics (SiOC) are gaining traction.
These materials, originally developed in academic labs, are now finding commercial footing thanks to superior oxidation resistance, amorphous thermal stability, and excellent creep resistance—making them ideal for custom burner nozzles, thermocouple sheaths, and high-wear furnace tiles.
What Is Silicon Oxycarbide?
Silicon oxycarbide (SiOC) is an amorphous ceramic composed of silicon, carbon, and oxygen in a disordered network. Unlike crystalline ceramics, SiOC’s non-periodic structure enables it to:
Resist grain-boundary weakening at high temperatures
Maintain low thermal conductivity across a wide range
Withstand both oxidizing and reducing conditions
Retain structural integrity above 1400°C
SiOC is typically derived from preceramic polymer precursors, such as polysiloxanes, which are pyrolyzed in controlled atmospheres to produce dense or porous components.
Key Furnace Applications
Flame Tubes and Combustion Linings
SiOC’s high thermal and chemical durability supports longer lifecycles under cyclic thermal loads.
Sensor Sleeves and Thermowells
Excellent resistance to carburization, hydrogen attack, and thermal gradient stress.
Slide Gates and Wear Liners
Outstanding mechanical erosion resistance in applications with abrasive particle flows.
Support Structures in Reducing Atmospheres
Unlike many oxides, SiOC maintains properties in H₂-rich or CO atmospheres, making it ideal for carbon black reactors or hydrogen furnaces.
Key Properties
Thermal stability: up to 1600°C (in inert atmospheres)
Amorphous creep resistance superior to alumina at high temperatures
Oxidation resistance in air up to 1300°C
Low thermal conductivity (1.5–2.5 W/m·K)
Good dimensional stability with low sintering shrinkage
What to Ask When Sourcing
Is the SiOC dense, foam, or composite grade?
Are components pressure-cast, molded, or machined from blanks?
What’s the binder burnout profile and ceramic yield?
Does the part maintain mechanical strength after 100+ thermal cycles?
: A New Furnace Workhorse
Silicon oxycarbide ceramics are redefining what’s possible in high-temperature environments. For buyers and engineers tackling aggressive atmospheres and fluctuating thermal demands, SiOC offers a flexible, long-wearing, high-purity alternative that outperforms many traditional refractories and technical ceramics.
