How to choose a suitable box furnace？

Identify core needs
Application scenarios: Determine the purpose of the box furnace (such as heat treatment, sintering, ashing, laboratory research, etc.). Different purposes have different requirements for temperature, atmosphere and temperature control accuracy.
Sample characteristics: Understand the properties of the material to be processed (such as melting point, oxidation sensitivity, size and shape) to match the furnace parameters.

Key parameter selection
Temperature range:Low temperature furnace (<1200℃): usually used for drying and annealing, the heating element is a resistance wire (such as nickel-chromium alloy).
Medium and high temperature furnace (1200℃~1400℃): suitable for ceramic sintering and metal heat treatment, requiring silicon carbon rod (SiC) or silicon molybdenum rod (MoSi₂).
Ultra-high temperature furnace (>1500℃): requires special design (such as tungsten/molybdenum heating elements), and the cost is relatively high.
Recommendation: Choose a maximum temperature 10%-20% higher than the actual demand to avoid long-term full-load operation.
Furnace size:Capacity calculation: select according to the maximum sample volume, and ensure that there is enough space around the sample (at least 5-10cm gap) to ensure thermal circulation.
Uniformity impact: For large furnaces, attention should be paid to the layout of heating elements and the configuration of circulation fans to avoid excessive temperature difference between the edge and the center.
Temperature control system configuration
Temperature control accuracy:Laboratory grade: ±1℃ or less, choose a multi-stage PID controller or programmable logic controller (PLC).
Industrial grade: ±5℃ may be enough, but high stability is required.
Thermocouple type:K type (nickel-chromium-nickel-aluminum): suitable for 0-1200℃, economical and commonly used.
S type (platinum-rhodium): used for high-precision measurement >1200℃, with higher cost.

Atmosphere and sealing
Atmosphere type:Inert gas (N₂, Ar): requires airtight furnace and gas flow control system.
Vacuum: requires vacuum pump and pressure-resistant furnace body (stainless steel double-layer shell), and the vacuum degree is selected according to demand (low vacuum or high vacuum).
Reactive gas (H₂, CO): strict explosion-proof design, safety certification required.
Sealing design: observe whether the furnace door uses a water-cooled sealing ring or flange structure to ensure long-term use without leakage.

Energy efficiency and energy-saving design
Insulation materials:Ceramic fiber: lightweight, low heat capacity, suitable for rapid temperature rise and fall, but may pulverize under long-term high temperature.
Alumina brick: good durability, suitable for long-term high temperature operation, but large thermal inertia.
Energy-saving function: Choose models with waste heat recovery or zone heating function to reduce energy consumption.

Safety and reliability
Protection function:Automatic power off when over temperature, leakage protection, over current protection.
Furnace over temperature alarm (such as double thermocouple monitoring).
Structural safety:Anti-scalding design of furnace door (such as outer surface temperature <60℃).
Emergency cooling system (such as optional water cooling jacket).

After-sales terms/user feedback
Confirm the warranty period (usually 1-3 years) and whether free calibration service is provided.
Replacement cost and delivery cycle of wearing parts (heating elements, thermocouples).
Contact existing users to understand actual usage experience such as failure rate and after-sales service quality.

Zhengzhou Protech provides customized services for heat treatment equipment. We can customize different temperatures, furnace sizes,
digital displays/touch screens, control systems/vacuum systems, etc. according to customer needs. Welcome to consult.

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