Silicon Nitride Ceramic Tubes

Silicon Nitride Ceramics

Silicon Nitride Ceramic Tubes

Custom silicon nitride ceramic tubes offering high strength, fracture toughness, wear resistance, low thermal expansion, and excellent thermal-shock resistance for demanding industrial applications.

Detailed Product Information

Typical Properties of Silicon Nitride Ceramic Tubes

Property

Typical Range

Unit

Density

3.20–3.25

g/cm³

Continuous Operating Temperature in an Oxidizing Atmosphere

1200–1300

°C

Flexural Strength at Room Temperature

800–1000

MPa

Compressive Strength

3000–3500

MPa

Fracture Toughness

6–8

MPa·m¹/²

Thermal Conductivity at 25°C

25–40

W/(m·K)

Coefficient of Thermal Expansion, 25–1000°C

3.0–3.5

×10⁻⁶/K

Typical Thermal-Shock Resistance, ΔT

500–800

°C

The values shown are representative ranges rather than guaranteed specifications. Actual properties depend on the silicon nitride grade, additives, manufacturing process, component geometry, operating atmosphere, and test method. Please contact TecCera to confirm material data for your application.

 

Silicon Nitride (Si₃N₄) Ceramic Tubes

TecCera supplies silicon nitride ceramic tubes for high-temperature, wear-intensive, and thermally demanding industrial applications. Silicon nitride combines high mechanical strength, fracture toughness, low thermal expansion, and excellent thermal-shock resistance.

Compared with alumina and many conventional ceramic materials, silicon nitride tubes provide greater resistance to mechanical impact and rapid temperature changes. Custom outside diameters, inside diameters, lengths, wall thicknesses, end structures, and surface finishes are available according to customer drawings.

Key Features

  • High flexural strength and fracture toughness
  • Excellent resistance to thermal shock
  • Low coefficient of thermal expansion
  • Good mechanical strength at elevated temperatures
  • High hardness and resistance to abrasive wear
  • Good corrosion resistance in many industrial environments
  • Low density compared with many engineering metals
  • Open-ended, closed-ended, flanged, and custom configurations available
  • Precision grinding and machining available

Available Tube Configurations

  • Open-ended ceramic tubes
  • Closed-end protection tubes
  • Single-bore and multi-bore tubes
  • Flanged and stepped tubes
  • Thin-wall and thick-wall tubes
  • Precision-ground tubes and sleeves
  • Custom tubes manufactured to drawings

Typical Applications

Molten-Metal Processing

Selected silicon nitride grades provide good resistance to molten aluminum and reduced wetting under suitable operating conditions. Typical components include:

  • Thermocouple protection tubes
  • Heater protection tubes
  • Riser and stalk tubes
  • Dosing and transfer tubes
  • Molten-aluminum handling components

Compatibility must be confirmed according to the metal composition, temperature, atmosphere, and required service life.

High-Temperature Equipment

  • Furnace protection tubes
  • Temperature-sensor sleeves
  • Burner and nozzle components
  • Heating-element supports
  • Thermal-processing equipment components

Mechanical and Wear Applications

  • Wear-resistant sleeves
  • Guide tubes
  • Shaft-protection components
  • Nozzle liners
  • Fluid-control and metering components

Semiconductor and Industrial Equipment

  • Precision insulating sleeves
  • Equipment support tubes
  • Process fixtures
  • Thermally stable structural components

Suitability for semiconductor processing depends on purity, surface condition, contamination limits, and equipment-specific requirements.

Related Silicon Nitride Products

  • Silicon nitride ceramic plates
  • Silicon nitride substrates
  • Bearing balls and rollers
  • Shafts and plungers
  • Nozzles and valve components
  • Custom structural ceramic parts

Frequently Asked Questions

1. How does silicon nitride compare with alumina in thermal-shock resistance?

Silicon nitride generally provides better thermal-shock resistance than alumina because of its lower thermal expansion and higher fracture toughness.

Thermal-shock performance should not be defined by a single ΔT value. It depends on material grade, tube dimensions, wall thickness, surface condition, heating rate, cooling medium, and test method.

2. What is the maximum service temperature of a silicon nitride tube?

The maximum service temperature depends on the material grade, mechanical load, atmosphere, and required service life.

Many dense silicon nitride grades can operate at approximately 1000–1200°C in air. Higher temperatures may be possible in controlled non-oxidizing atmospheres, but the final limit must be confirmed for the specific grade and operating conditions.

3. Are silicon nitride tubes resistant to corrosive media?

Silicon nitride provides good resistance to many industrial chemicals, gases, and selected molten non-ferrous metals. However, it is not universally resistant to every acid, alkali, molten salt, or molten metal.

Compatibility must be evaluated for hydrofluoric acid, concentrated alkalis, molten salts, reactive metals, and high-temperature corrosive media.

4. Can silicon nitride ceramic tubes be customized?

Yes. Customizable parameters include:

  • Outside and inside diameters
  • Length and wall thickness
  • Open or closed ends
  • Flanges, steps, holes, and slots
  • Dimensional and geometric tolerances
  • Ground, lapped, or polished surfaces
  • Material grade and manufacturing process

Please provide a technical drawing, operating temperature, atmosphere, chemical exposure, mechanical load, and required quantity for evaluation and quotation.

Contact TecCera for custom silicon nitride ceramic tubes, technical review, material selection, samples, and quotation.