High Temperature Tubular Furnace is a tubular heating device capable of stable operation at temperatures exceeding 1200°C for extended periods. It is commonly used for sintering, annealing, calcining, atmosphere conditioning, and high-temperature experimental research.

It uses high-performance heating elements (such as silicon carbide rods, molybdenum silicon rods, and graphite heating elements) to heat the sample within the tube to the desired temperature. Combined with a vacuum or atmosphere system, the heat treatment process is completed in a controlled environment.

II. Structural Components

High-temperature tube furnaces generally consist of the following components:

Furnace body and insulation

Double-layer steel shell structure with air cooling system

Internal insulation material: vacuum-formed alumina fiber or multi-layer composite insulation bricks

Heating Elements

SiC (silicon carbide) heating rods: commonly used for temperatures between 1400–1500°C

MoSi₂ (molybdenum silicon) rods: commonly used for temperatures between 1650–1800°C

Graphite heating elements: capable of temperatures of 2000–3000°C in vacuum or inert atmosphere

Heating tubes

Materials include quartz, alumina, corundum, graphite, and SiC ceramics.

Common tube diameters range from Φ40–Φ150 mm.

Temperature Control System

PID Programmable Temperature Controller

Supports multi-stage heating curves

Accuracy up to ±1°C

Atmosphere and Sealing System

Flanges, O Rings, clamps

Inert gas (nitrogen, argon) or reducing gas (hydrogen) is introduced.

Optional vacuum pump units are available to achieve low pressure or high vacuum.

III. Operating Principle

High-temperature tube furnaces use electrical energy to drive heating elements, which transfer heat to the sample within the tube through radiation and convection.

Multi-zone control creates a uniform temperature field or temperature gradient within the tube. The atmosphere system ensures that the sample is heated in a specific chemical environment to avoid oxidation, reaction acceleration, or deposition.

IV. Main Features

High-Temperature Resistance: Long-term operation reaches 1200–1800°C, with special designs exceeding 2000°C

Excellent Temperature Uniformity: Multi-zone design ensures temperature differences within ±3°C between uniform zones

Controllable Atmosphere: Supports air, inert gas, reducing gas, and vacuum environments

Precise Temperature Control: PID control with programmable temperature curves

Safety Features: Over-temperature protection, disconnection, door opening, and gas interlock

V. Applications

Ceramics and Powder Metallurgy: High-temperature sintering and densification

New Energy Materials: Sintering of lithium iron phosphate cathode materials

Semiconductors and Electronics: Crystal growth, diffusion, and annealing

Atmosphere Heat Treatment: Hydrogen reduction, nitridation, and carbonization

Research Experiments: Material performance testing and thermochemical reaction research

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