KJ GROUP GSL-1100X Large-Diameter Vacuum & Atmosphere Tube Furnace

Overview

The KJ GROUP GSL-1100X is a horizontally oriented, high-precision vacuum and controlled-atmosphere tube furnace engineered for thermal processing of large-dimension samples under inert, reducing, oxidizing, or vacuum conditions. It operates on the principle of resistive heating via Mo-doped FeCrAl alloy elements, thermally coupled to a high-purity fused quartz tube chamber. The furnace features a triple-zone heating architecture—each zone independently controllable over 300 mm—to ensure exceptional axial temperature uniformity across a 550 mm constant-temperature region. Designed for reproducible high-temperature treatments up to 1100 °C (continuous operation at 1000 °C), it supports applications including solid-state synthesis, ceramic sintering, thin-film annealing, precursor decomposition, and CVD precursor pyrolysis. Its modular quartz tube design—with standard internal diameters ranging from Ø152 mm to Ø280 mm and 1000 mm length—enables scalable sample loading while maintaining tight thermal control and gas-tight integrity when paired with stainless steel flanges and vacuum-rated seals.

Key Features

• Triple-zone heating system (3 × 300 mm zones) with independent PID control for optimized thermal gradient management and enhanced axial uniformity (±1 °C within 550 mm)
• 51-segment programmable temperature profile capability, supporting complex ramp-hold-cool sequences with user-defined dwell times and rate limits
• High-purity fused quartz tube chamber rated for repeated thermal cycling; available in four internal diameters (Ø152 / Ø203 / Ø216 / Ø280 mm) to accommodate varying sample geometries and throughput requirements
• Mo-doped FeCrAl heating elements offering extended service life, stable resistance at elevated temperatures, and compatibility with vacuum and low-oxygen atmospheres
• Integrated stainless steel vacuum flange assembly with dual O-ring sealing (Viton or Kalrez optional), compatible with standard vacuum pumps and gas delivery systems (e.g., mass flow controllers, pressure regulators)
• Robust mechanical construction: 150 kg unit housed in insulated steel cabinet with front-access door, rear-mounted cooling fans, and grounding-compliant AC 380 V / 5 kW input

Sample Compatibility & Compliance

The GSL-1100X accommodates bulk substrates, stacked wafers, rod-shaped precursors, and multi-layer assemblies—ideal for R&D labs scaling up materials synthesis from lab to pilot batch. Quartz tube compatibility extends to most non-hydrofluoric-acid-based chemistries and avoids catalytic surface interactions common with alumina or metal tubes. The furnace meets general electrical safety standards per IEC 61010-1 for laboratory equipment. While not certified to UL/CSA out-of-box, its wiring, grounding, and thermal cutoffs align with GLP-compliant installation practices. When operated with validated vacuum gauges and calibrated thermocouples (Type S or K, included), thermal profiles satisfy ASTM E220 and ISO/IEC 17025 traceability requirements for temperature measurement uncertainty reporting.

Software & Data Management

The embedded PID controller supports RS485 Modbus RTU communication (optional USB-to-RS485 adapter required) for integration into centralized lab automation platforms. Real-time temperature logging, setpoint synchronization, and alarm event capture are achievable via third-party SCADA or LabVIEW-compatible drivers. All 51-step programs—including ramp rates, hold durations, and power limits—are stored non-volatilely and support password-protected editing. Audit trails (start/stop timestamps, operator ID, deviations >±2 °C) can be exported as CSV files for FDA 21 CFR Part 11–aligned record retention when paired with compliant PC-based acquisition software.

Applications

• Sintering of large-area ceramic green bodies (e.g., YSZ electrolytes, AlN substrates) under N₂ or Ar
• Graphitization and thermal reduction of carbon-based composites in vacuum or H₂/N₂ mixtures
• Post-deposition annealing of CVD-grown 2D materials (MoS₂, h-BN) on Si/SiO₂ or flexible metal foils
• Thermal treatment of battery electrode rolls (LiCoO₂, NMC cathodes) under controlled O₂ partial pressure
• Decomposition kinetics studies of metal-organic frameworks (MOFs) using programmed TGA-like heating protocols
• Calibration of high-temperature reference materials against NIST-traceable standards

FAQ

What vacuum level can the GSL-1100X achieve with standard configuration?
With a typical two-stage rotary vane pump (not included), base pressure reaches ≤5 × 10⁻² mbar. For pressures below 10⁻³ mbar, a turbomolecular pumping station is recommended.
Is the quartz tube resistant to hydrogen atmospheres at 1000 °C?
Yes—high-purity fused quartz exhibits excellent chemical stability in dry H₂ up to 1100 °C; however, moisture contamination must be avoided to prevent devitrification.
Can I upgrade to a 4-zone heating configuration?
No—the furnace is mechanically and electrically designed for three fixed heating zones; zone count is not field-upgradable.
Does the system include vacuum gauge and gas flow meters?
No—these are optional accessories. The standard configuration includes only vacuum flange ports, thermocouple feedthrough, and electrical connections.
What is the maximum recommended continuous operating temperature?
1000 °C for extended service life; 1100 °C is rated for intermittent use (≤2 hours per cycle) to preserve quartz tube integrity and heater longevity.