ZHONGHUAN FURNACE ZHX Series 1300°C Energy-Efficient High-Temperature Vacuum & Atmosphere Box-Type Resistance Furnace

Overview

The ZHONGHUAN FURNACE ZHX Series is a high-performance, energy-efficient box-type resistance furnace engineered for precise thermal processing under vacuum or controlled atmospheres. Operating up to 1300°C, it employs Joule heating via high-stability silicon carbide (SiC) rods—rated for surface temperatures of 1500°C—ensuring long-term thermal consistency and minimal element degradation. Its cylindrical vacuum chamber, constructed entirely from corrosion-resistant stainless steel, enables stable vacuum levels down to 10⁻³ Pa when paired with compatible vacuum pumping systems. The furnace utilizes polycrystalline mullite fiber insulation, vacuum-formed for structural integrity and thermal uniformity, delivering up to 50% energy savings versus conventional refractory-lined furnaces. Temperature uniformity across the 600 × 1400 × 600 mm working zone is maintained within ±3°C at 1300°C—validated per ASTM E220 and ISO 9001 calibration protocols. This architecture supports repeatable, traceable heat treatment cycles essential for materials synthesis, sintering, annealing, and ashing in R&D and quality control laboratories.

Key Features

• Cylindrical stainless steel vacuum vessel with rectangular ring dynamic sealing technology—eliminates flange-based assembly, reducing installation-induced mechanical stress and enhancing long-term vacuum integrity.
• Vacuum-formed polycrystalline mullite fiber insulation—low thermal conductivity (<0.15 W/m·K at 1000°C), high emissivity, and dimensional stability up to 1400°C.
• Intelligent surface temperature management: integrated thermal sensor triggers external forced-air cooling when outer casing exceeds 50°C—maintaining operator safety and ambient lab compliance without compromising internal thermal profile.
• AI-enhanced temperature controller featuring PID algorithm, fuzzy logic compensation, and self-tuning capability—enabling robust setpoint tracking under variable load conditions and thermal inertia.
• RS-485 communication interface compliant with Modbus RTU protocol—supports integration into centralized lab automation networks for remote monitoring, data logging, and audit-ready event tracing.
• Modular gas manifold compatibility—designed for seamless coupling with mass flow controllers (MFCs) or rotameters to deliver precise N₂, Ar, H₂, or forming gas mixtures at regulated flow rates (0–5000 sccm typical).

Sample Compatibility & Compliance

The ZHX furnace accommodates diverse sample geometries—including crucibles (alumina, quartz, graphite), ceramic boats, and metal substrates—within its spacious 0.504 m³ chamber. It meets structural and operational requirements for ASTM C1141 (refractory testing), ISO 11567 (thermal aging of polymers), and USP heavy metal residue analysis. When configured with optional vacuum gauges and pressure controllers, it supports processes requiring Class 5–6 vacuum environments (per ISO 8573-1). The system’s control firmware includes configurable alarm thresholds, password-protected parameter editing, and timestamped operation logs—aligning with FDA 21 CFR Part 11 expectations for electronic records in GMP-regulated labs. All electrical components conform to IEC 61000-6-3 (EMC) and IEC 61000-6-4 (immunity) standards.

Software & Data Management

The furnace supports dual control pathways: embedded programmable logic (50-stage domestic / 40-stage imported) and external PC-based supervision via ZHONGHUAN’s proprietary LabFurnaceControl™ software. The latter provides real-time graphical visualization of thermocouple readings (Type S or K), power consumption trends, vacuum pressure curves, and gas flow profiles. Data is stored in CSV and SQLite formats with automatic time-stamping, user ID tagging, and SHA-256 checksum validation. Audit trails include operator login/logout events, parameter changes, and emergency stop activations—retained for ≥18 months as required by GLP Annex 11. Remote access is enabled via secure TCP/IP connection; multi-unit synchronization allows coordinated ramp-hold-cool sequences across distributed furnace arrays.

Applications

• High-purity sintering of advanced ceramics (e.g., Si₃N₄, ZrO₂) under inert vacuum to suppress oxidation and grain boundary impurity diffusion.
• Controlled-atmosphere annealing of thin-film photovoltaic substrates (CIGS, perovskites) with precise O₂ partial pressure regulation.
• Thermogravimetric pre-treatment of catalyst supports prior to BET surface area analysis.
• Metallurgical phase transformation studies (e.g., austenitization, martensitic tempering) requiring ±1°C thermal stability over extended dwell periods.
• Residue-free ashing of pharmaceutical excipients per USP , with programmable ramp-to-ash protocols minimizing volatile loss.
• Calibration of secondary temperature sensors using fixed-point references (e.g., Al, Zn, Ag freezing points) in vacuum-compatible crucible assemblies.

FAQ

What vacuum level can the ZHX furnace achieve when paired with standard rotary vane pumps?
With a two-stage oil-sealed rotary vane pump and cold trap, the system typically reaches 1×10⁻² to 5×10⁻³ Pa. For higher vacuum (≤1×10⁻⁴ Pa), a turbomolecular pump upgrade is recommended.
Is the furnace compatible with hydrogen atmospheres?
Yes—when equipped with leak-tested stainless steel gas lines, explosion-proof solenoid valves, and H₂-compatible MFCs, the system supports safe operation up to 5% H₂ in N₂ or Ar at pressures up to 0.1 MPa gauge.
Can the touchscreen interface display real-time vacuum pressure alongside temperature?
Yes—the optional full-color TFT panel integrates analog inputs from capacitance manometers or Pirani gauges, overlaying pressure traces on the main temperature curve view.
Does the control system support automated failure recovery after power interruption?
The controller retains the last executed program segment and resumes from the point of interruption upon power restoration—provided the thermal soak duration has not exceeded user-defined hold-time tolerance.
What calibration documentation is supplied with the furnace?
Each unit ships with a factory-assembled NIST-traceable temperature uniformity report (per ASTM E220 Method B), electrical safety test certificate (IEC 61010-1), and vacuum integrity verification log.