KJ GROUP GSL-1400X-II Dual-Zone Vacuum & Atmosphere Tube Furnace

Overview

The KJ GROUP GSL-1400X-II is a dual-zone programmable tube furnace engineered for high-temperature thermal processing under controlled vacuum or reactive/inert atmospheres. Designed around a robust double-layer stainless steel housing and insulated with high-purity alumina fiber modules formed via vacuum adsorption, the furnace delivers exceptional thermal stability and energy efficiency. Its core heating architecture employs high-density silicon carbide (SiC) rods—resistant to thermal shock and oxidation up to 1400 °C—paired with S-type platinum-rhodium thermocouples for precise temperature sensing across two independently controllable heating zones. Each zone features dedicated PID control via the 518P temperature controller, enabling gradient thermal profiles essential for advanced materials synthesis, including solid-state reaction kinetics, precursor decomposition, thin-film CVD pre-treatment, and multi-step sintering protocols. The furnace supports both static and dynamic atmosphere operation, accommodating gas flow rates up to 500 mL/min when integrated with external mass flow controllers and gas mixing systems.

Key Features

• Dual independent heating zones with separate PID controllers for precise axial temperature profiling (e.g., ramp-hold-cool gradients)
• Vacuum-rated flanged quartz or alumina tube configuration (Φ60 mm or Φ80 mm × 1200 mm), sealed with high-temperature silicone O-rings and stainless steel CF-style flanges
• High-density SiC heating elements with extended service life under cyclic thermal stress and ambient oxygen exposure
• CE-certified electrical architecture with grounded AC 220 V input, over-temperature protection, and fail-safe relay cutoff
• Thermally optimized alumina fiber insulation yielding low external surface temperature (<60 °C at 1300 °C internal)
• Integrated vacuum port (KF25 or ISO-KF compatible) supporting base pressures down to 10⁻² mbar with optional two-stage rotary vane pump

Sample Compatibility & Compliance

The GSL-1400X-II accommodates standard ceramic, metallic, and semiconductor substrates in crucibles or boats—including alumina, quartz, and graphite containers—within its 120 mm uniform temperature zone. It meets fundamental safety and electromagnetic compatibility requirements per EU Directive 2014/35/EU (Low Voltage Directive) and 2014/30/EU (EMC Directive), evidenced by CE marking. While not inherently GLP/GMP-validated, the system supports audit-ready operation when paired with optional PC-based data logging software (compliant with FDA 21 CFR Part 11 requirements for electronic records and signatures). All standard components—including S-type thermocouples and alumina tubes—conform to ASTM C71 and ISO 27327 specifications for high-temperature refractory integrity.

Software & Data Management

An optional RS485/USB communication module enables integration with KJ GROUP’s proprietary furnace control software, permitting remote parameter setting, real-time temperature curve visualization, and automated protocol execution. Logged data—including time-stamped temperature, setpoint, and zone power output—is exportable in CSV format for traceability. When configured with digital vacuum gauges and gas flow controllers, the software supports synchronized multi-parameter acquisition aligned to IEC 61508 functional safety principles. Audit trails include user ID, timestamp, and parameter change history—critical for quality assurance documentation in ISO 9001-certified laboratories.

Applications

• Pre-sintering and final densification of multilayer ceramic capacitors (MLCCs) and piezoelectric ceramics
• Thermal annealing of transition metal oxide cathodes for lithium-ion battery R&D
• Chemical vapor deposition (CVD) precursor pyrolysis and substrate pre-conditioning
• Controlled-atmosphere carburization, nitridation, and reduction of metal powders
• High-temperature phase transformation studies in perovskite oxides and MAX-phase precursors
• Calibration reference furnaces for thermocouple verification per ASTM E230

FAQ

What vacuum level can be achieved with the standard configuration?
The base system includes a vacuum port but no pump; with an optional dual-stage rotary vane pump, typical base pressure reaches 1×10⁻² mbar. For higher vacuum (≤10⁻⁵ mbar), a turbomolecular pumping station is recommended.
Is the furnace suitable for hydrogen atmosphere operation?
Yes—when equipped with H₂-rated stainless steel flanges, leak-tested seals, and appropriate gas monitoring, the GSL-1400X-II supports safe operation under 5% H₂/Ar mixtures up to 1300 °C per ASTM E2653 guidelines.
Can the two zones operate at different temperatures simultaneously?
Yes—each zone has independent thermocouple feedback and PID tuning, enabling stable differential setpoints (e.g., 800 °C inlet / 1200 °C hot zone) for thermal gradient processing.
What maintenance is required for long-term reliability?
Biannual inspection of SiC rod resistance, thermocouple calibration against NIST-traceable references, and replacement of silicone O-rings after 200 thermal cycles above 1000 °C are recommended.
Are custom tube dimensions available?
Yes—custom alumina or quartz tubes (up to Φ100 mm × 1500 mm) can be ordered directly from KJ GROUP’s manufacturing division, subject to lead time and dimensional tolerance verification.