Microcomputer-Controlled Constant-Temperature Sintering Resistance Furnace

The furnace uses resistance wire heating elements and an imported dual-microprocessor controller with 0.1-class accuracy, paired with an enhanced SSR and bidirectional thyristor regulation to achieve stable PID temperature control. A hot-air circulation design routes airflow between the chamber and inner wall through dedicated channels, improving temperature uniformity by compensating heat loss to the walls.

The chamber lining is made of polycrystalline mullite fiber insulation, with the heating elements arranged in a single row on removable racks supported by silicon carbide brackets. A motor-driven impeller induces strong internal circulation at approximately 0.8–1.0 cycles per minute, while upper vent ports with open/close mechanisms facilitate exhaust connection and removal of process gases.

A motorized lift door provides automated opening and closing via a reducer, pulleys, steel wire rope, and limit switches. The base features fixed rails and a rolling platform for smooth loading and unloading of heavy workpieces, and the overall assembly is sealed and well insulated for efficient operation.

The hearth includes a silicon carbide bottom plate rated to 1400°C and a rotating tray supported by a heat-resistant stainless-steel shaft with a silicon carbide disc, driven at a constant 1–5 rpm. Dual thermocouples positioned at the upper and lower zones are independently managed by two programmed controllers to enhance zone control and temperature uniformity.

Typical applications include sintering, annealing, melting, and physico-chemical heating tasks for plastics, ceramics, and composites in factories, laboratories, and research institutions.