RBSiC/SiSiC
RBSiC/SiSiC is reaction-bonded silicon carbide: a porous SiC/carbon preform infiltrated with molten silicon to give a near-net-shape, essentially pore-free body covered by GB/T 3521.
Reference datasheet — RBSiC/SiSiC is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
Values for the SISIC-STD condition
RBSiC/SiSiC tempers and conditions
RBSiC/SiSiC is supplied in 4 conditions, soft to hard. SISIC-STD is the default FabDigit quotes; the values on this page are for it.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
SISIC-STDDefault standard reaction-bonded SiSiC (≈88–90 % SiC, 10–12 % free Si) | Default choice for nozzles, wear liners, heat-exchanger tubes and general near-net-shape SiSiC parts up to 1350 °C. | 200 | 2,300 HV | 130 W/m·K | ||
fine-grain, low free-silicon high-strength SiSiC (≥92 % SiC) | Pick when maximum bend strength, hardness and wear life are needed — seal faces, bearings, precision optics substrates, ballistic tiles. | 250 | 2,500 HV | 150 W/m·K | ||
Graphite-loaded self-lubricating SiSiC for seal faces | Use for dry-running or poorly lubricated mechanical seals and bearings where the dispersed graphite lowers friction and blister risk. | 1,800 HV | 110 W/m·K | |||
coarse-grain kiln-furniture / thermal grade (beams, rollers, plates) | Cheapest large-section SiSiC for kiln beams, roller-hearth rolls, saggars and burner tubes where thermal shock and creep matter more than strength. | 2,100 HV | 110 W/m·K |
What is RBSiC/SiSiC?
RBSiC/SiSiC is reaction-bonded silicon carbide: a porous SiC/carbon preform infiltrated with molten silicon to give a near-net-shape, essentially pore-free body covered by GB/T 3521. It is chosen for large, complex parts at lower cost than fully sintered SiC, offering 130 W/m·K thermal conductivity, 390 GPa modulus, 200 MPa tensile strength and good thermal shock resistance. The free silicon phase caps service temperature at 1350 °C and is attacked by strong alkalis and HF, so SSiC is the alternative for aggressive chemical or higher-temperature duty. RBSiC/SiSiC has a density of 3.05 g/cm³ (0.11 lb/in³), lighter than 75% of ceramic grades. It melts at 1,410°C (2,570 °F). RBSiC/SiSiC has a tensile strength of 200 MPa (29 ksi), stronger than 60% of ceramic grades. Elongation at break is 0% and the elastic modulus is 390 GPa (56.6 Msi).
What is RBSiC/SiSiC used for?
- kiln furniture
- burner nozzles
- mechanical seal faces
- semiconductor process components
- heat exchanger tubes
Advantages
- Conducts heat well — 130 W/m·K (75.1 BTU/hr·ft·°F), better than 91% of ceramic grades
- High service temperature — 1,350°C (2,462 °F), better than 77% of ceramic grades
- Good corrosion resistance — 88/100, better than 77% of ceramic grades
- Lightweight — 3.05 g/cm³ (0.11 lb/in³), better than 75% of ceramic grades
RBSiC/SiSiC properties
Typical room-temperature values for RBSiC/SiSiC-SISIC-STD; bars are the position among ceramic grades.
Physical3
RBSiC/SiSiC has a density of 3.05 g/cm³ (0.11 lb/in³), lighter than 75% of ceramic grades. It melts at 1,410°C (2,570 °F).
Mechanical13
RBSiC/SiSiC has a tensile strength of 200 MPa (29 ksi), stronger than 60% of ceramic grades. Elongation at break is 0% and the elastic modulus is 390 GPa (56.6 Msi).
Thermal5
RBSiC/SiSiC is rated for continuous service to 1,350°C (2,462 °F). It conducts heat at 130 W/m·K (75.1 BTU/hr·ft·°F), better than 91% of ceramic grades. Thermal expansion is 4.3 µm/m·K (2.39 µin/in·°F).
Electrical2
RBSiC/SiSiC has an electrical resistivity of 0.001 Ω·m.
Chemical & Environmental2
Corrosion resistance is excellent (88/100), better than 77% of ceramic grades.
Sustainability4
Producing a kilogram of RBSiC/SiSiC takes about 105 MJ of energy and emits 7.5 kg of CO₂ — less than 54% of ceramic grades. Typical recycled content is 5%.
Manufacturability3
RBSiC/SiSiC's machinability is not recommended (4/100, worse than 85% of ceramic grades).
Common Calculations4
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the ceramic family
Yield strength against density for every ceramic grade FabDigit runs. RBSiC/SiSiC is highlighted; hover a dot for its name, or open the interactive family chart.
Working with RBSiC/SiSiC
Is RBSiC/SiSiC easy to machine?
All shaping is done green (turning, milling, drilling of the porous preform); after siliconising only diamond grinding, lapping, ultrasonic or EDM (the material is conductive) is possible.
Can RBSiC/SiSiC be welded?
Not weldable; joints are made by silicon brazing during infiltration, glass/oxide sealing or by mechanical/adhesive assembly with compliant gaskets.
Can RBSiC/SiSiC be formed, bent or molded?
Preforms are slip-cast, pressure-cast, extruded, isostatically pressed or 3D-printed and then infiltrated with molten Si at 1450–1600 °C in vacuum/argon with essentially zero shrinkage, which allows very large and complex parts.
RBSiC/SiSiC chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| SiCprimary α-SiC grains plus secondary β-SiC formed by the Si + C reaction | 85 – 94 | 89 |
| Cresidual free carbon; intentionally higher (up to ~5 %) in graphite-loaded seal grades | 0 – 1 | 0.2 |
| Fe+Al+Ca oxidesraw-material impurities | 0 – 0.5 | 0.2 |
| Sifree metallic silicon filling the former pore network | ≥ 6 (balance) |
What surface finishes work on RBSiC/SiSiC?
Excess surface silicon is grit-blasted or ground off; seal and bearing faces are diamond-lapped to <0.1 µm Ra, and a thermally grown SiO₂ film provides the oxidation protection — no plating or painting is used.
Equivalent designations
Standards and trade names that resolve to RBSiC/SiSiC in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- Also called
- RBSiCSiSiC
- Similar grades
- GB/T 3521
How much does RBSiC/SiSiC cost?
RBSiC/SiSiC is a high-cost ceramic ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
RBSiC/SiSiC — frequently asked
What is RBSiC/SiSiC used for?
RBSiC/SiSiC is typically used for kiln furniture, burner nozzles, mechanical seal faces, semiconductor process components and heat exchanger tubes. In short: cheapest near-net-shape SiC; zero-shrinkage large parts; free silicon limits temperature.
What is the tensile strength of RBSiC/SiSiC?
RBSiC/SiSiC has a typical tensile strength of 200 MPa (29 ksi) — stronger than 60% of ceramic grades. Strength varies by condition: see the 4 listed tempers.
Is RBSiC/SiSiC easy to machine?
Not especially — machinability is rated not recommended (4/100, worse than 85% of ceramic grades). All shaping is done green (turning, milling, drilling of the porous preform); after siliconising only diamond grinding, lapping, ultrasonic or EDM (the material is conductive) is possible.
Can RBSiC/SiSiC be welded?
Not weldable; joints are made by silicon brazing during infiltration, glass/oxide sealing or by mechanical/adhesive assembly with compliant gaskets.
What surface finishes work on RBSiC/SiSiC?
Excess surface silicon is grit-blasted or ground off; seal and bearing faces are diamond-lapped to <0.1 µm Ra, and a thermally grown SiO₂ film provides the oxidation protection — no plating or painting is used.
Can RBSiC/SiSiC be formed, bent or molded?
Preforms are slip-cast, pressure-cast, extruded, isostatically pressed or 3D-printed and then infiltrated with molten Si at 1450–1600 °C in vacuum/argon with essentially zero shrinkage, which allows very large and complex parts.
What is the maximum service temperature of RBSiC/SiSiC?
RBSiC/SiSiC is rated for continuous use to about 1,350°C (2,462 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
How much does RBSiC/SiSiC cost?
RBSiC/SiSiC is a high-cost ceramic ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Sources
- ASM Engineered Materials Handbook, Vol. 4: Ceramics and Glasses — ASM International (1991)
- Reaction-bonded silicon carbide (SiSiC) component datasheets — Saint-Gobain / CoorsTek / Kyocera / 3M Technical Ceramics (2023)
- Technical ceramics property tables — non-oxide carbides — Ceramic Industry / Matmatch compiled producer data (2023)
Property data is compiled from published supplier and standards handbooks and normalised for comparison; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.