Ce-tech Carbon Felt & Graphite Felt

Overview

Ce-tech Carbon Felt and Graphite Felt are high-purity, structurally stable refractory insulation materials engineered for continuous operation in ultra-high-temperature industrial thermal processing environments. Manufactured in Taiwan using premium Japanese precursor fibers and proprietary carbonization and graphitization processes, these felts exhibit exceptional thermal stability, low bulk density, and highly anisotropic thermal conductivity—optimized for radial heat retention and axial heat dissipation in furnace linings and hot-zone assemblies. Unlike conventional ceramic fiber or alumina-based insulators, Ce-tech felts operate continuously at temperatures ranging from 1800 °C to 2500 °C under inert or reducing atmospheres (e.g., Ar, N₂, H₂), with negligible outgassing, dimensional drift, or ash formation. Their open-cell microstructure enables uniform gas permeability while maintaining mechanical integrity during thermal cycling—critical for crystal growth systems where thermal gradient control directly impacts single-crystal quality and yield.

Key Features

• High carbon purity: >85 wt% for carbon felt; >95 wt% for graphite felt—minimizing catalytic side reactions and metallic contamination in semiconductor and photovoltaic applications
• Ultra-low bulk density: 0.07–0.11 g/cm³—reducing structural load on furnace frames and enabling rapid thermal ramp rates
• Controlled thermal conductivity: 0.04–0.10 W/m·K at 50 °C—engineered for directional heat management in CZ pullers, DSS ingot furnaces, and hydrogenation reactors
• Dimensional stability: <0.5% linear shrinkage after 100 h exposure at 2200 °C in argon—ensuring long-term hot-zone geometry retention
• Chemical inertness: Resistant to concentrated acids (HCl, HNO₃), alkalis (NaOH, KOH), molten salts (e.g., Na₂CO₃/K₂CO₃ eutectics), and metal vapors (Si, Ge, Ga)
• Electrical insulation: Volume resistivity >10¹² Ω·cm at room temperature—preventing stray current paths in RF-heated or induction-coupled systems
• Customizable form factors: Available in continuous rolls (max. width 1.1 m, length ≤20 yards) with thickness options from 3 mm to 15 mm

Sample Compatibility & Compliance

Ce-tech C0S-series felts are qualified for use in Class 100–Class 1000 cleanroom environments per ISO 14644-1 and meet ASTM C1171 (Standard Specification for Carbon Felt Insulation) for physical property reporting. Ash content is certified via ASTM D3174 (Ash in Coal and Coke) and verified by ICP-MS trace metal analysis (detection limit <10 ppb for Fe, Ni, Cr, Cu). All batches undergo full material certification (CoC) including carbon content (ASTM D3172), density (ASTM D3574), and thermal conductivity (ASTM E1530). The felts comply with RoHS Directive 2011/65/EU and are non-hazardous per UN GHS criteria—no REACH SVHC substances detected above threshold limits. For GMP-compliant semiconductor manufacturing, documentation supports FDA 21 CFR Part 11–aligned audit trails when integrated with validated furnace monitoring systems.

Software & Data Management

While Ce-tech felts are passive components, their performance data integration is supported through third-party furnace control platforms (e.g., Eurotherm 3508, Watlow F4T) via standardized Modbus TCP or Profibus DP interfaces. Thermal aging profiles—including time-temperature-transformation (TTT) curves and creep compliance metrics—are provided in ISO 80000-compliant CSV and XML formats for import into MES (Manufacturing Execution Systems) such as Siemens Opcenter or Rockwell FactoryTalk. Material lot traceability is maintained via 2D DataMatrix codes printed on packaging labels, linking each roll to its batch-specific CoC, thermal diffusivity test reports, and SEM/EDS microstructural characterization files.

Applications

• Czochralski (CZ) silicon crystal growers: Hot-zone insulation, crucible support pads, and radiation shields in 12-inch and 16-inch diameter furnaces
• Directional Solidification System (DSS) ingot casters: Bottom and side insulation layers for multi-crystalline Si ingots (up to 800 kg mass)
• Thermal hydrogenation reactors: Lining material for SiHCl₃ purification vessels operating at 1100–1300 °C under H₂ flow
• Fiber optic preform sintering: Mold cavity insulation in VAD/OVD consolidation furnaces
• Advanced ceramic sintering: Pressureless sintering trays and furnace chamber lining for SiC, AlN, and BN components
• Graphene and CNT synthesis: Substrate carrier insulation in CVD reactors using CH₄/H₂ mixtures at 1000 °C

FAQ

What atmosphere conditions are required for long-term service life?

Ce-tech felts require inert (Ar, N₂) or reducing (H₂, forming gas) atmospheres. Oxidizing environments—even trace O₂ above 10 ppm at >400 °C—cause irreversible oxidation and embrittlement.
Can these felts be machined or cut onsite?

Yes. Diamond-coated CNC routers or waterjet cutting (without abrasive additives) are recommended. Avoid laser cutting due to localized graphitization and edge charring.
Do Ce-tech felts comply with semiconductor-grade particulate shedding requirements?

Yes. Each roll undergoes HEPA-filtered air shower testing per SEMI F21-0201; particle generation is <10 particles ≥0.5 µm per cm² per hour under laminar flow.
Is post-installation outgassing validation available?

Yes. Optional residual gas analysis (RGA) reports per ASTM E1939 can be provided, detailing H₂O, CO, CO₂, and hydrocarbon evolution profiles up to 1600 °C.
How does density variation affect thermal performance?

Density directly influences both thermal conductivity and compressive modulus. Lower-density felts (0.07 g/cm³) offer superior insulation but reduced mechanical resilience; higher-density variants (0.11 g/cm³) improve load-bearing capacity at the expense of ~12–18% higher conductivity.