1.Hardness and wear resistance
Hard ceramic surfaces suit seal faces, sleeves and abrasive-flow components. Impact, edge loading and lubrication remain application-specific.
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Silicon Carbide
Hard, thermally conductive ceramic materials for sealing, abrasive-flow equipment, thermal processing and precision handling. SSiC, RBSiC and RSiC differ in composition, porosity and manufacturing route.
SSiC, RBSiC, RSIC and SiC-based ceramics
Six core advantages
2.Thermal-service capability
SiC routes are used in furnace and thermal-processing components. The allowable temperature depends on route, atmosphere, load and cycle—not one family-wide maximum.
3.Heat-transfer performance
Thermal conductivity supports heat redistribution in process equipment. Compare values at the same temperature and for the specified material route.
4.Chemical-service options
SiC is used in corrosive-fluid equipment. Medium, concentration, exposure temperature and residual silicon determine compatibility.
5.Low density and structural rigidity
SiC combines relatively low ceramic density with stiffness for supports and handling parts. Component geometry and loading determine deflection and strength requirements.
6.Low thermal expansion
Low expansion supports dimensional control in temperature-cycled assemblies. Thermal-shock performance also depends on geometry, heat transfer and surface condition.
Typical applications
Mechanical seals, pumps and valves
Mechanical seal rings and sleeves provide hard mating and sliding surfaces. Face pairing, lubrication, fluid chemistry and solids content define the duty.
Semiconductor and photovoltaic equipment
Ceramic arms, cantilever paddles, trays and vacuum chucks support process loading, handling and holding. Purity, particles, flatness and surface acceptance must be specified.
Chemical and environmental equipment
FGD nozzles, process tubes and wear linings combine defined flow geometry with wear-facing surfaces. Spray pattern, abrasive particles and chemical exposure guide selection.
Furnaces and thermal-processing equipment
Furnace tubes and setter plates serve thermal-process and support functions. Foundry crucibles require a separate construction specification; graphite-containing vessels are not dense SiC.
Energy and emissions-control systems
SiC component forms can support thermal processing and abrasive-gas or slurry-handling equipment. Atmosphere, erosion, thermal cycling and installed supports remain part-specific.
Specialist aerospace applications
SiC-based structures and composites are used in specialist aerospace work. These require project-specific material and component qualification and are not a claim of certified aerospace supply.
Material comparison
| Material / route | Density (g/cm³) | Bending strength (MPa) | Conductivity (W/(m·K)) | Material distinction |
|---|---|---|---|---|
| SSiC — sintered | ≥3.12 | ≥400 at 25°C | ≥110 at 25°C | Dense sintered route; grade chemistry and finished surfaces remain important. |
| RBSiC / SiSiC — reaction bonded | ≥3.03 | ≥350 at 25°C | ≥90 at 25°C | Residual silicon; chemical and thermal limits differ from SSiC. |
| RSiC — recrystallized | 2.65–2.75 (bulk) | 80–100 at 20°C | 36.6 at 1200°C | Porous route; permeability and load support differ from dense ceramics. |
| 99% alumina | 3.85 | 330 at 25°C | 27 at 25°C | Oxide-ceramic alternative where electrical insulation is important. |
| 95% silicon nitride | ≥3.2 | >720 at 25°C | 15–20 at 25°C | Alternative for mechanical-duty components. |
Manufacturing processes and design options
Reaction bonding / silicon infiltration
Silicon infiltrates a SiC/carbon preform and reacts to form additional SiC. Residual silicon remains in the structure. Low firing shrinkage can benefit near-net-shape geometry; chemistry and thermal exposure require route-specific review.
Pressureless sintering
SSiC is densified by sintering rather than silicon infiltration. Powder composition, additives and firing shrinkage influence the material and dimensional plan. Final functional surfaces may require finishing.
Recrystallized and bonded SiC
Recrystallized and other bonded SiC routes have different porosity, bond phases and load-bearing behavior. They must not inherit dense SSiC or RBSiC sealing and property assumptions.
Precision finishing and inspection
Sealing faces, bores, datum surfaces and flatness define finishing priorities. Agree drawing tolerances, edge conditions, surface finish and inspection evidence for the actual component.
High-purity, coated and composite systems
High-purity SiC, CVD-SiC coatings and SiC composites are distinct specifications. Substrate, coating, purity, particle limits and qualification must be identified separately; these are not automatic capabilities of every SiC product.
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Send the drawing, quantity, medium, temperature cycle, load and critical surfaces. Material route and process options are confirmed for the selected part.
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