High-purity mullite short fiber produced by a sol-gel route
Alumina-silica sol precursor, followed by spinning, gelation and high-temperature calcination
Main phase 3Al₂O₃·2SiO₂, orthorhombic — no phase transformation at high temperature
Standard length 50–200 μm (adjustable), aspect ratio 15–50
Chopped fiber / whisker mat / water-based slurry to suit different forming processes
Typical values below. Contact our engineers for the complete TDS.
| Parameter | Typical value | Test method |
|---|---|---|
| Chemical composition | Al₂O₃ 71-74% / SiO₂ 26-29% | XRF |
| Main phase | Mullite (3Al₂O₃·2SiO₂) ≥95% | XRD |
| Fiber diameter | 3–8 μm (custom 1–15 μm) | SEM |
| Fiber length | 50–200 μm (custom) | Optical microscopy |
| Aspect ratio | 15-50:1 | — |
| True density | 3.16-3.22 g/cm³ | GB/T 5071 |
| Melting point | ~1850°C | DTA |
| Max service temp. (oxidising) | 1600°C | — |
| Max service temp. (inert) | 1700°C | — |
| Tensile strength | >1.5 GPa | Single-filament tensile |
| Elastic modulus | >200 GPa | Single-filament tensile |
| CTE (RT–1000 °C) | 4.5-5.3 ×10⁻⁶/°C | GB/T 7320 |
| Thermal conductivity (800 °C) | 3-5 W/(m·K) | GB/T 10297 |
| Dielectric constant (1 MHz) | 6.5-7.0 | GB/T 1409 |
| Specific surface area | 1-5 m²/g | BET |
| Moisture content | ≤0.5% | GB/T 3007 |
Ceramic matrix composites, high-temperature insulation
Aerospace thermal protection, high-temperature structures
Kiln linings, high-temperature gaskets
3D-printed bodies, cast forming
Rocket nozzle exit cones, re-entry vehicle TPS tiles, CMC reinforcement for hot-section engine parts
Furnace linings, kiln-car deck plates, pusher-kiln doors, aluminium melting furnace linings
SOFC electrolyte supports, heat-resistant coatings for Li-ion separators, insulation for polysilicon ingot furnaces
GPF/DPF mat reinforcement, high-temperature friction materials for brake pads, turbocharger heat shields
Contact us for the complete technical documentation, MSDS and customisation advice.
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