Zhuochi KSXL-4-10 Vacuum & Atmosphere-Controlled Muffle Furnace

Overview

The Zhuochi KSXL-4-10 Vacuum & Atmosphere-Controlled Muffle Furnace is a precision-engineered box-type thermal processing system designed for laboratory-scale heat treatment under controlled ambient conditions. It operates on resistive heating principles using high-stability resistance wire elements embedded within a multi-layer insulation architecture comprising lightweight refractory fiber board and ceramic insulation brick. The furnace achieves stable operation across a calibrated temperature range of 100 °C to 1000 °C, with a certified control accuracy of ±1 °C and display resolution of 1 °C. Its hermetically sealed chamber—featuring a gasketed double-layer door and water-cooled flange interface—enables reliable vacuum evacuation (down to ≤10 Pa with compatible external pumps) or inert/reducing atmosphere purging. This dual-mode capability supports fundamental materials science workflows including vacuum annealing, controlled-atmosphere sintering, CVD precursor decomposition, and oxidation-sensitive thermal treatments.

Key Features

• Hermetic chamber design with stainless-steel gas ports, integrated vacuum pressure gauge, and water-cooled sealing flange to maintain thermal integrity during vacuum or gas-flow operation
• LTDE-based programmable controller supporting up to 50 ramp/soak segments, enabling precise thermal profiles for complex sintering, annealing, or carburizing protocols
• Dual-stage over-temperature protection system compliant with IEC 61000-4-2 electromagnetic immunity standards and UL 61010-1 safety requirements
• Uniform temperature distribution verified per ASTM E220 methodology across the 400 × 400 × 400 mm internal cavity (64 L nominal volume)
• Modular gas handling interface: dual-valved inlet for regulated gas introduction (N₂, Ar, H₂/N₂), single-valved outlet with optional exhaust condensation trap, and calibrated flow meter (0–10 L/min range)
• Robust mechanical construction using cold-rolled steel housing and high-purity alumina-silica fiber insulation, minimizing thermal mass and enabling ≤30 min ramp to 1000 °C

Sample Compatibility & Compliance

The KSXL-4-10 accommodates crucibles, boats, and fixtures fabricated from alumina, quartz, molybdenum, or graphite—compatible with samples up to 150 mm in height and 300 mm in diameter. Its vacuum-tight design meets ISO 27422:2018 specifications for laboratory furnace leak integrity testing (helium leak rate <1 × 10⁻⁸ mbar·L/s). When operated under inert gas purge, it satisfies ASTM F519 requirements for hydrogen embrittlement mitigation during heat treatment of high-strength alloys. The system supports GLP-compliant documentation when paired with validated data logging software (see Software & Data Management section) and adheres to ICH Q5D guidelines for thermal process validation in pharmaceutical excipient manufacturing.

Software & Data Management

The LTDE controller provides native RS485 Modbus RTU output for integration with third-party SCADA platforms (e.g., LabVIEW, Ignition, or DeltaV). Optional firmware upgrade enables 21 CFR Part 11–compliant audit trail functionality—including user authentication, electronic signatures, and immutable event logs—with timestamped records of setpoint changes, alarm triggers, and thermocouple calibration events. Data export is supported in CSV and XML formats, facilitating traceability for ISO/IEC 17025-accredited laboratories. All firmware revisions undergo functional safety assessment per IEC 61508 SIL1 criteria.

Applications

• Vacuum annealing of silicon wafers and thin-film substrates to eliminate interstitial oxygen defects without surface oxidation
• Atmosphere-controlled sintering of tungsten carbide composites under argon to suppress grain coarsening
• Thermal decomposition of metal-organic precursors in CVD processes at 800–950 °C under nitrogen carrier gas
• Stress-relief heat treatment of additively manufactured Ti-6Al-4V components under 5% H₂/95% N₂ to reduce residual porosity
• Calibration of thermocouples and reference materials per ASTM E230/E230M using fixed-point metal baths (Sn, Zn, Al)
• Controlled cooling studies for phase transformation kinetics in Fe–C alloys using programmable quench rates

FAQ

What vacuum level can the KSXL-4-10 achieve?

The furnace itself is vacuum-rated to ≤10 Pa when used with a two-stage rotary vane pump (e.g., Edwards RV8) and proper sealing maintenance. For high-vacuum applications (<10⁻³ Pa), a turbomolecular pump with cold trap is required.
Is the water-cooling system mandatory for all operating modes?

Yes—the water-cooled flange must be active during any vacuum or gas-flow operation above 600 °C to prevent seal degradation and maintain gasket integrity per manufacturer’s service bulletin #KSXL-4-10-REV3.
Can this furnace be used for oxidizing atmospheres?

No. The standard configuration excludes O₂-compatible seals and gas lines. Oxidizing operation requires custom modification including Inconel 600 feedthroughs and fluorosilicone gaskets, subject to engineering review.
What is the recommended maintenance interval for the insulation assembly?

Inspect fiber board integrity annually per ASTM C711; replace if compressive strength falls below 0.8 MPa (measured via ISO 844 compression test) or if visible cracking exceeds 2 mm depth.
Does the controller support remote monitoring via Ethernet?

Not natively—but an RS485-to-Ethernet gateway (e.g., Moxa NPort 5110A) enables secure TCP/IP access with TLS 1.2 encryption for networked lab environments.