Zhuochi SK3-6-13-6 Energy-Efficient Programmable Vacuum Tube Furnace

Overview

The Zhuochi SK3-6-13-6 is a high-performance programmable vacuum tube furnace engineered for precise thermal treatment of materials under controlled atmospheric conditions. It operates on the principle of resistive heating via imported high-stability heating elements embedded within a low-thermal-mass, ultra-lightweight insulating chamber—enabling rapid thermal response and exceptional energy efficiency. The furnace core consists of a replaceable high-purity quartz or sintered alumina tube (Ø60 mm × 900 mm), sealed at both ends using stainless steel flanges, precision-machined O-rings, and aerospace-grade high-temperature silicone-based sealant rated to 1300 °C. Its vacuum-rated construction supports base pressures down to 10⁻² mbar when paired with an external two-stage rotary vane pump (not included), and optional gas inlet ports allow for continuous purging with N₂, Ar, H₂, or forming gas. This architecture makes the SK3-6-13-6 suitable for applications requiring strict oxygen exclusion, such as sintering of air-sensitive ceramics, annealing of thin-film substrates, and precursor decomposition in CVD precursor studies.

Key Features

• Programmable LTDE temperature controller with multi-segment ramp/soak profiles, enabling up to 30 programmable steps per cycle—including custom cooling rates, hold times, and automatic power-off sequencing.
• Energy-optimized furnace chamber constructed from low-heat-capacity refractory fiber modules, reducing standby losses and improving thermal uniformity (±5 °C across 100 mm axial zone at 1300 °C).
• Vacuum-tight tube assembly featuring dual stainless steel end caps, calibrated analog vacuum gauge (0–760 Torr), and integrated inlet/outlet valves compatible with standard KF-25 or CF-35 vacuum fittings.
• Modular design allows field replacement of heating elements and insulation without disassembly of structural housing—minimizing downtime during maintenance.
• Over-temperature protection circuitry with independent thermocouple monitoring and automatic cut-off at 1350 °C ensures compliance with IEC 61000-6-2 electromagnetic immunity standards.

Sample Compatibility & Compliance

The SK3-6-13-6 accommodates cylindrical samples up to Ø58 mm × 650 mm in length and is routinely employed for thermal processing of catalysts, battery electrode precursors, metal-organic frameworks (MOFs), and nanowire arrays. Its tube geometry supports horizontal sample placement on ceramic or graphite boats, and optional quartz or alumina crucibles are available for batch processing. All wetted components—including sealing gaskets and feedthroughs—meet USP Class VI biocompatibility requirements for non-leaching performance. While not certified to UL or CE for standalone safety listing, the unit conforms to general laboratory equipment safety guidelines outlined in ANSI Z9.5–2022 (Laboratory Ventilation) and ISO 15195:2018 (Calibration of Temperature Measurement Equipment). For GLP/GMP environments, audit-ready operation logs can be exported via RS485 interface for integration into validated data management systems.

Software & Data Management

The LTDE controller provides local touchscreen operation with real-time temperature curve visualization and password-protected parameter editing. Optional USB data logging enables export of time-stamped temperature vs. time datasets in CSV format for post-processing in MATLAB, Python, or Excel. When connected to a PC via RS485-to-USB adapter, the furnace supports Modbus RTU protocol for remote monitoring and control through third-party SCADA platforms. All setpoints, ramp rates, and alarm events are stored in non-volatile memory with timestamped history retention exceeding 10,000 entries—supporting traceability requirements under FDA 21 CFR Part 11 when used with compliant electronic signature workflows.

Applications

• Controlled-atmosphere calcination of Li-ion cathode materials (e.g., NMC, LFP) under Ar/H₂ mixtures.
• Thermal reduction of metal oxides to nanoparticulate metals for catalytic testing.
• Graphitization and annealing of carbon nanotubes and graphene oxide films.
• Preparation of phosphors and upconversion nanoparticles via solid-state reaction.
• Outgassing studies of polymeric encapsulants and space-grade adhesives under high vacuum.
• Low-temperature activation of zeolites and mesoporous silica supports.

FAQ

What vacuum level can the SK3-6-13-6 achieve?
With a properly maintained two-stage rotary vane pump and leak-free seals, the system typically reaches 1×10⁻² mbar. For lower pressures, a turbomolecular pump may be added externally.
Can the furnace operate under positive pressure?
Yes—when equipped with pressure-rated end caps and a regulated gas supply, it supports inert gas overpressure up to 0.1 MPa (1 bar gauge), provided all seals and tubing are rated accordingly.
Is calibration certificate included?
A factory-as-tested calibration report (traceable to NIST standards via accredited lab) is available upon request at no additional cost; full UKAS-accredited calibration requires separate quotation.
What thermocouple type is used?
The standard configuration includes a Type S (Pt/Pt–10% Rh) thermocouple mounted in direct contact with the heating zone wall, offering stability and accuracy ±1.5 °C up to 1300 °C.
Does the unit support Ethernet or Wi-Fi connectivity?
No native Ethernet or Wi-Fi interface is built-in; however, industrial gateways (e.g., Moxa EDS-G205A) can be deployed to enable TCP/IP communication via Modbus TCP conversion.