The NS400 large-size air-cooled vacuum eutectic furnace is the 3rd-generation vacuum eutectic furnace launched by Zhongke Tongzhi. Exclusively designed for vacuum eutectic welding applications such as large-size small-batch production, R&D and functional material testing, it heats workpieces in a vacuum environment to achieve void-free solder joints, fully meeting the testing requirements of R&D departments and production needs of large-size small-batch manufacturing. The NS400 can reduce the void rate of the welding area of bonded devices to ≤2%, while the void rate of conventional eutectic furnaces typically ranges from 20% to 30%. It supports flux-free welding for void-free solder joints and is compatible with various protective atmospheres including N₂ and N₂/H₂ (95%/5%). The furnace is adaptable to lead-free solder paste/solder sheet processes as well as flux-free welding processes. Its software control system features simple operation, enabling direct equipment control, programming of various welding process curves, and customization and modification of curves for different processes. The NS400 is engineered for high-reliability welding fields with stringent requirements (e.g., military products and industrial high-reliability products), where nitrogen-protected welding or vapor phase welding fails to meet the required product reliability standards. It is the ideal solution for applications demanding ultra-high circuit welding reliability—such as material testing, chip packaging, power equipment, automotive products, train control systems, aerospace and aviation systems—by eliminating or minimizing voids and oxidation in welding materials. Reducing void rate and oxidation of solder pads or component pins is critical for high-quality welding, a technological innovation widely adopted by welding experts in the military fields of Germany, Japan, the United States and other developed countries. Industry & Application Fields Ideal for: R&D, process development, material testing and device packaging testing; a premium choice for high-end R&D and production in military enterprises, research institutes, universities, aerospace and aviation fields. Core Applications: Defect-free welding and high-quality flux-free welding of chip-substrate and package lid-baseplate assemblies, applicable to IGBT packaging, solder paste processes, laser diode packaging, hybrid integrated circuit packaging, package lid sealing, MEMS packaging and vacuum packaging. Vacuum eutectic furnaces have become essential equipment for high-end manufacturing in the military, aerospace and aviation industries of developed countries in Europe and America, and are widely used in chip packaging and electronic welding fields. Core Performance & Features Welding in a true high-vacuum environment with a minimum vacuum degree of 5Pa. Professional software control system for an intuitive and seamless operating experience. Industry-leading 40-segment programmable temperature control system for customizing optimal welding process curves. Adjustable temperature settings to create process curves that perfectly match the thermal characteristics of welding materials. Advanced cooling technology for rapid temperature reduction (standard configuration). In-situ temperature measurement for precise detection of temperature uniformity in the welding area, providing expert-level support for process calibration. Compatible with nitrogen and other inert gases to meet the requirements of special welding processes. Maximum working temperature of 450℃ (higher temperature optional), satisfying all soft soldering process requirements. Supports simultaneous heating of upper and lower temperature zones for uniform heating of workpieces. Structural & Design Advantages Automatic door locking: Program-controlled automatic door retraction and locking for secure and reliable operation. Optimized heating tube layout: Bottom heating tubes (optional) are installed at a 90° angle to the top heating tubes, ensuring superior temperature uniformity—especially at the four edges of the heating plate. Quartz-sheathed heating tubes: Heating tubes are encased in quartz sleeves, allowing replacement without breaking the furnace chamber vacuum for convenient and efficient maintenance. Centered heating tube fixation: Specially designed brackets secure heating tubes in the center of quartz sleeves, effectively extending the service life of quartz tubes. High-temperature coating on heating tubes: A high-temperature coating on the back of heating tubes improves heat utilization efficiency and reduces energy loss. Integrated CNC-machined vacuum door lock: Ensures stable micro-positive pressure in the furnace chamber and enables long-term continuous operation. Integrated CNC-machined cooling pipelines: Eliminates the risk of water leakage from welded cooling pipes in the vacuum chamber. High-performance vacuum chamber: Fabricated from special materials and optimized with 12 years of vacuum design and process expertise, ensuring a minimum vacuum degree of 5Pa with a matched vacuum oil pump. Premium Configuration & Reliability The main electrical components and temperature control system adopt advanced industrial-level configurations with excellent temperature uniformity, making the furnace suitable for the soldering of CSP and BGA components. Energy-saving furnace liner: Adopts a heat-insulating and airtight structure for superior thermal insulation and low power consumption. The average power consumption is only 8.5 kW/h, compared with the industry average of 15 kW/h for reflow ovens, achieving a 40% energy reduction and saving more than 50,000 RMB in annual energy costs for 24/7 operation. Stable self-developed software system: Realizes online real-time temperature measurement and monitoring of workpieces, supports real-time data analysis, as well as data storage and printing functions for full process traceability. Precision temperature control: Each temperature zone features forced independent circulation and independent PID control, with separate upper and lower heating methods, ensuring accurate and uniform temperature in the furnace chamber with large heat capacity. Rapid warm-up: The time from room temperature to operating temperature is ≤20 minutes, greatly improving production efficiency. Stable air supply & transmission: Imported high-temperature and high-speed motors ensure stable air supply with low vibration and low noise; aluminum alloy guide rails undergo high-temperature processing to prevent deformation during long-term operation. Comprehensive safety protection: Equipped with a power-off protection function, with a built-in computer and transmission UPS to ensure the normal output of workpieces after power failure and avoid damage. Durable & clean furnace liner: Made of stainless steel, featuring corrosion resistance and no slag falling, effectively protecting the cleanliness of workpieces during the soldering process. Intelligent status monitoring: Automatic real-time monitoring and display of equipment working status for easy operation and maintenance. Adjustable hot air system: Custom-designed wind wheels ensure stable air speed; the hot air speed of the furnace body is frequency-converted and adjustable, with controllable thermal shock degree. Dual efficient cooling systems: Forced air cooling: Adopts a pressurized forced air cooling structure with an extended cooling zone for excellent cooling effect; Circulating water cooling: Cooled by an external industrial water chiller for uniform and rapid cooling, with adjustable cooling water temperature and real-time cooling zone temperature display. Precision gas & oxygen monitoring: Equipped with a nitrogen flow meter for real-time nitrogen flow monitoring and an oxygen analyzer for real-time oxygen content detection; the software automatically records oxygen concentration changes for process traceability. Long-life furnace chamber seals: A dedicated water cooling module is integrated into the seals to reduce operating temperature, extend service life, ensure excellent sealing performance and lower replacement frequency.
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