Zhongke Aobo GL0617 1700°C High-Temperature Vacuum Tube Furnace

Overview

The Zhongke Aobo GL0617 is a high-precision, vertically integrated vacuum tube furnace engineered for demanding high-temperature thermal processing under controlled or inert atmospheres. Operating up to 1700°C with a rated working temperature of 1600°C, it employs MoSi₂ (molybdenum disilicide) heating elements and a high-purity alumina (99% Al₂O₃) ceramic tube—resistant to thermal shock, chemical corrosion, and dimensional drift at elevated temperatures. The furnace utilizes a dual-layer air-insulated outer shell with intelligent thermal management: surface temperature sensors trigger auxiliary cooling fans automatically when the external casing exceeds 45°C, ensuring operator safety and structural integrity. Its core design follows ISO/IEC 17025-aligned thermal uniformity principles, delivering a certified uniform temperature zone of ≥120 mm at ±1°C stability across the 300 mm heating length—critical for reproducible sintering, annealing, and crystal growth protocols.

Key Features

• MoSi₂ heating elements with U-shaped configuration for symmetrical radiant heat distribution and extended service life above 1500°C
• Multi-crystalline alumina fiber insulation chamber—low thermal mass, rapid ramp rates (up to 30°C/min), and energy efficiency exceeding 60% vs. traditional brick-lined furnaces
• Hermetic sealing system: double elastomeric O-rings within KF-standard AISI 304 stainless steel flanges, validated for vacuum integrity down to ≤ −0.1 MPa (10⁻³ mbar equivalent)
• Integrated gas manifold with precision micro-adjustable inlet/outlet valves; real-time internal pressure monitoring via analog gauge
• 50-segment programmable PID controller with self-tuning algorithm, fuzzy logic compensation, and power-fail parameter retention
• Modular open-frame design with reinforced stepped joint construction—prevents furnace ceiling deformation and ensures long-term alignment of tube and flange interfaces
• Comprehensive safety architecture: independent over-temperature cutoff (hardware-limited), earth-leakage circuit interruption (ELCI), and thermal runaway suppression

Sample Compatibility & Compliance

The GL0617 accommodates cylindrical samples up to 60 mm in diameter and 300 mm in active heating length, compatible with standard 99% alumina tubes (Φ60 × 1000 mm). It supports ASTM C1161 (flexural strength of ceramics), ISO 2738 (sintered metal density), and USP (thermal degradation studies) workflows. All electrical components comply with IEC 61000-6-3 (EMC emission limits) and IEC 61000-6-4 (immunity). Vacuum and gas-handling subsystems meet ISO 2852 (sanitary flange standards) for cleanroom-compatible installation. The furnace is suitable for GLP/GMP environments when paired with validated 21 CFR Part 11-compliant data logging software (optional add-on).

Software & Data Management

The embedded controller logs time-temperature-pressure profiles internally (10,000-point buffer) and exports via RS485/Modbus RTU to third-party SCADA or LIMS platforms. Optional PC software enables full audit trail generation—including user login timestamps, parameter modification history, and calibration event records—meeting FDA 21 CFR Part 11 requirements for electronic records and signatures. Raw thermocouple voltage data (Type B, 0–1820°C range) is recorded at 1 Hz resolution with ±0.5°C traceable uncertainty (NIST-traceable calibration certificate available upon request).

Applications

• High-temperature vacuum annealing of semiconductor wafers and thin-film photovoltaic substrates
• Sintering of advanced ceramics (SiC, ZrO₂, AlN) and refractory metal powders (Mo, W, Ta)
• Controlled-atmosphere carburization, nitriding, and oxidation kinetics studies per ASTM E2550
• Growth of carbon nanotubes and graphene precursors via CVD under H₂/CH₄/N₂ mixtures
• Thermal gravimetric analysis (TGA) coupling with mass spectrometry (MS) or FTIR gas analyzers
• Preparation of battery cathode materials (e.g., LiCoO₂, NMC) requiring precise oxygen partial pressure control

FAQ

What is the maximum continuous operating temperature?
The furnace is rated for continuous operation at 1600°C; 1700°C is the absolute upper limit for short-duration (<30 min) thermal cycles.
Can the furnace be used under reducing atmospheres such as H₂?
Yes—provided the H₂ concentration remains below 5% vol. in N₂ carrier gas and flow rates are maintained within laminar regime to prevent MoSi₂ oxidation or embrittlement.
Is the alumina tube resistant to HF or molten alkali exposure?
No. While highly resistant to most acids and oxidizers, 99% alumina exhibits limited compatibility with hydrofluoric acid or molten NaOH/KOH. Alternative quartz or fused silica tubes are not recommended above 1100°C.
Does the system include vacuum pump integration?
No—the GL0617 includes only the furnace body, flanges, and pressure gauge. A separate two-stage rotary vane or turbomolecular pump (with appropriate oil mist filter) must be selected based on required base pressure and gas load.
How often does the furnace require recalibration?
Annual verification against NIST-traceable reference thermocouples is recommended; thermocouple drift should not exceed ±2°C over 1000 h at 1600°C under static conditions.