What is a silicon carbide burner nozzle?
A silicon carbide burner nozzle is a ceramic part fitted at the burner outlet of a kiln or furnace. It carries the flame from the burner housing into the heating chamber and defines the outlet shape the flame passes through. ADCERAX makes these burner outlet nozzles in silicon carbide ceramic, either in catalog outlet sizes or to a drawing, for kiln builders, furnace OEMs and plant maintenance teams.
Silicon carbide burner nozzle sizes
The following dimensions are reference options for early selection. Final size should be confirmed according to burner housing, furnace wall thickness, outlet position, flame direction and installation drawings. ADCERAX can also produce non-standard SiC burner nozzles based on samples or technical drawings.
| Item | Inner Diameter（mm) | Outer Diameter（mm) | Length（mm) | Application Note |
| AT-THG-P1001 | 30 | 50 | 100-2000 | Suitable as a small burner outlet reference size. |
| AT-THG-P1002 | 35 | 55 | 100-2000 | Used when a slightly larger flow passage is required. |
| AT-THG-P1003 | 40 | 65 | 100-2000 | Suitable for medium burner housing designs. |
| AT-THG-P1004 | 45 | 70 | 100-2000 | Used where stronger wall thickness is required. |
| AT-THG-P1005 | 50 | 70 | 100-2000 | Suitable for larger flame passage requirements. |
| AT-THG-P1006 | 55 | 75 | 100-2000 | Used for higher combustion flow designs. |
| AT-THG-P1007 | 60 | 78 | 100-2000 | Suitable for larger kiln burner systems. |
| AT-THG-P1008 | 65 | 80 | 100-2000 | Used where larger flame outlet geometry is required. |
| AT-THG-P1009 | 70 | 80 | 100-2000 | Suitable for thin-wall large-bore nozzle designs after review. |
| AT-THG-P1010 | 80 | 105 | 100-2000 | Used for large industrial furnace burner interfaces. |
Silicon carbide grades for burner nozzles
Four silicon carbide routes are available for burner outlet nozzles. The route is selected together with the geometry, atmosphere and thermal cycle, and it is written on the order as an AD-SIC grade.
| Grade | Structure | Typical selection focus |
|---|---|---|
| AD-SIC-RB | Reaction-bonded SiC, dense, with residual free silicon | Large or complex nozzle shapes, machining requirements, nozzle temperature and exposure of the complete material system |
| AD-SIC-SS | Sintered SiC, dense | Precision geometry, working-surface condition, chemical exposure and thermal duty |
| AD-SIC-NB | Silicon nitride bonded SiC, porous | Bond-phase behavior, porosity and flow or sealing requirements of the proposed part |
| AD-SIC-RC | Recrystallized SiC, porous skeleton | Lightweight parts and thermal cycling; porosity, hot strength and permeability are verified per order |
Material-level test data
The values below describe the material, measured on test bars under the stated conditions. They are not ratings of a finished nozzle.
| Property (condition) | AD-SIC-RB | AD-SIC-SS | AD-SIC-NB |
|---|---|---|---|
| SiC content (wt%) | 85 nominal | ≥99 | 80 nominal |
| Bond / secondary phase | 15 wt% residual free silicon, nominal | No silicon-infiltration phase | 20 wt% Si₃N₄ bond, nominal |
| Bulk density (g/cm³, selection value) | ≥3.02 | 3.10 typical | 2.80 typical |
| Open porosity (vol%) | ≤0.1 | <0.1 | 12 typical |
| Flexural strength (MPa, 20 °C, typical) | 250 | 380 | 160 |
| Flexural strength (MPa, 1200 °C, typical) | 280 | — | 180 |
| Compressive strength (MPa, typical) | — | ≥2600 | — |
| Young's modulus (GPa, 20 °C, typical) | 330 | 420 | 220 |
| Young's modulus (GPa, 1200 °C, typical) | 300 | — | — |
| Thermal conductivity (W/m·K) | 45 at 1200 °C | 100–120; temperature not stated | 15 at 1000 °C |
| Grade selection ceiling (°C) | 1380 | 1600 | 1550 |
Why Silicon Carbide Burner Nozzles Fail
Check these six areas when reviewing a damaged nozzle or specifying a replacement.
1. Handling and Installation Damage
- Possible cause: Impact on the outlet rim or uneven clamping chips ceramic edges.
- What to do: Support the body, protect the rim and apply clamping loads through the intended mounting interface.
2. Burner Misalignment
- Possible cause: Misalignment creates uneven flame exposure and localized heating.
- What to do: Check the nozzle axis, housing alignment and wall opening before mounting.
3. Thermal Shock
- Possible cause: Rapid startup or sudden cooling creates excessive temperature differences within the nozzle.
- What to do: Follow the burner system’s approved heating and cooling procedures.
4. Deposits and Blocked Passages
- Possible cause: Dust, ash, glaze or scale restricts passages and changes the outlet profile.
- What to do: Inspect internal passages and side openings during maintenance.
5. Chemical or Atmosphere Attack
- Possible cause: Process gases, vapors or slag may attack the material, depending on the SiC grade and exposure.
- What to do: Provide gas composition, temperature and deposit details when surface loss or pitting appears.
6. Incorrect Fit or Clearance
- Possible cause: Insufficient expansion clearance loads the shoulder or sealing face as the assembly heats.
- What to do: Specify datums, tolerances and thermal-expansion allowances on the drawing.
Send photos of the damaged part and its operating conditions to help identify whether the issue relates to material, geometry or installation.
Start from a new design or an existing nozzle
New equipment or retrofit
Use the nozzle drawing and burner/furnace-wall section to define the ceramic purchase unit, its location, inlet/outlet geometry, mounting and sealing interfaces.
Replacement part
Burner identification, the original part number and installation-position photographs link the existing nozzle to its assembly. Unworn dimensions, mounting details and damaged surfaces support the geometry and service-condition review.
Packaging Process for Silicon Carbide Burner Nozzle
ADCERAX packs silicon carbide burner nozzles with protective cushioning and reinforced outer packaging according to part size, weight and shipping route. Before shipment, each nozzle can be checked for visible surface condition, key dimensions, outlet geometry and packaging stability to reduce transportation and installation risk.
