ZHONGHUAN FURNACE VT-1400V Vertical Single-Zone Tube Furnace

Overview

The ZHONGHUAN FURNACE VT-1400V is a vertically oriented, single-zone tube furnace engineered for high-temperature thermal processing under controlled atmosphere or vacuum conditions. Designed for laboratory-scale synthesis, annealing, sintering, and heat treatment applications, it operates on the principle of resistive heating via high-stability silicon carbide (SiC) rods, delivering precise and reproducible temperature profiles up to 1400 °C. Its vertical orientation optimizes space efficiency and facilitates gravity-assisted sample loading/unloading—particularly advantageous for rod-shaped, powder-packed, or crucible-based specimens. The furnace chamber is constructed from vacuum-formed polycrystalline mullite fiber insulation, offering low thermal mass, rapid thermal response, and uniform axial and radial temperature distribution (<±3 °C across the hot zone). This architecture supports both batch-mode operation and integration into multi-step process workflows requiring sequential heating, gas exchange, and cooling cycles.

Key Features

• Vertical single-zone configuration with optimized thermal symmetry and minimal vertical temperature gradient.
• Rapid-connect dual-flange gas interface using quick-clamp couplings—eliminates threaded flange alignment and reduces risk of quartz or ceramic tube damage during installation.
• Dual-ring sealing technology at both furnace ends ensures leak rates <1×10⁻³ mbar·L/s under inert gas pressure (tested per ISO 10967-2), supporting stable atmospheric control for oxidation-sensitive reactions.
• Intelligent air-cooling system with thermal-sensing activation: integrated axial fans automatically engage when external casing surface temperature exceeds 50 °C, maintaining operator safety and structural integrity of external components.
• Integrated safety interlocks: automatic power cutoff upon door opening, independent over-temperature protection (hardware-based limit controller), and ground-fault circuit interruption (GFCI) compliant with IEC 61000-4-5.
• Modular electrical architecture with RS-485 communication port (standard), enabling daisy-chain networking of up to 200 units for centralized monitoring via SCADA or LIMS platforms.

Sample Compatibility & Compliance

The VT-1400V accommodates standard OD 60–100 mm quartz, alumina, or silicon carbide tubes (custom lengths up to 1500 mm supported). Its internal dimensions (600 × 660 × 1260 mm) permit upright placement of tall crucibles, stacked wafers, or fiber spools. The furnace meets structural and electrical safety requirements per GB/T 13306–2011 (Chinese national standard for industrial electric furnaces) and conforms to electromagnetic compatibility (EMC) Class B limits under CISPR 11. When equipped with optional vacuum pumping systems (e.g., two-stage rotary vane or turbomolecular pumps), it achieves base pressures down to 10⁻³ Pa—suitable for processes governed by ASTM F1494 (Standard Terminology Relating to Vacuum Technology) and ISO 20483 (Vacuum metallurgy terminology). Gas flow integration supports mass flow controllers (MFCs) compliant with SEMI F57 for semiconductor-grade purge protocols.

Software & Data Management

The furnace ships with a dual-mode temperature controller featuring PID + fuzzy logic algorithms and auto-tuning capability. The domestic version supports up to 50 programmable ramp-hold segments; the optional imported controller offers 40-segment programming with soak-time validation and deviation alarms. All temperature logs—including setpoint, actual reading, thermocouple voltage, and event timestamps—are recorded at user-defined intervals (1–60 sec) and stored locally on an embedded SD card. Via RS-485/Modbus RTU, data streams synchronize in real time to Windows-based supervision software, enabling audit-trail generation compliant with FDA 21 CFR Part 11 (electronic records/signatures) when paired with timestamped user authentication and change-history logging. Export formats include CSV, PDF reports, and XML-compatible datasets for traceability in GLP/GMP environments.

Applications

• Synthesis and annealing of advanced ceramics, including SiC, AlN, and transparent polycrystalline oxides.
• Controlled-atmosphere graphitization and carbonization of polymer-derived fibers and precursors.
• Thermal processing of thin-film solar absorbers (e.g., CIGS, CZTS) under N₂/H₂/Ar mixtures.
• Low-pressure chemical vapor deposition (LPCVD) precursor decomposition studies.
• High-temperature calibration of thermocouples and radiation pyrometers (per ISO/IEC 17025).
• Research-scale production of battery cathode materials (e.g., NMC, LFP) with oxygen partial pressure control.

FAQ

What tube materials are compatible with the VT-1400V at maximum operating temperature?
Quartz tubes are rated for continuous use up to 1100 °C; high-purity alumina (99.7%) or recrystallized silicon carbide tubes are recommended for sustained operation at 1400 °C.
Can the furnace be operated under dynamic vacuum cycling without compromising seal integrity?
Yes—the dual-ring metal gasket design maintains sealing performance across repeated vacuum-atmosphere transitions, validated over 5000 cycles at 10⁻² Pa base pressure.
Is the temperature controller compliant with regulatory data integrity requirements?
When configured with the optional audit-trail-enabled software package and user access controls, the system satisfies ALCOA+ principles and supports 21 CFR Part 11 compliance for electronic records.
What is the typical thermal recovery time after sample insertion at 1200 °C?
Using a 25-mm OD quartz tube with 10 g of powdered sample, average recovery to ±2 °C of setpoint requires ≤8 minutes, verified per ASTM E220 calibration methodology.
Does the furnace support integration with third-party gas mixing manifolds?
Yes—standard 1/4″ VCR ports and analog 0–5 V / 4–20 mA interfaces enable direct connection to commercial gas blending systems (e.g., Brooks, Alicat) for precise multi-gas ratio control.