BTU INTERNATIONAL

BTU’s Convection Batch furnace with eductor driven convection flow from 200°C to 1600°C provides combined convection and radiant heating at high temperatures using our patented Eductor Technology. This provides the customer with the tightest temperature and atmosphere uniformity possible in the marketplace. Unlike traditional box furnace designs that have 20°C to 50°C variation inside the product load, this system has +/-5°C uniformity even in the 200°C – 450°C ranges, meeting the needs of the advanced ceramics industry.
BTU offers this system in our narrow cross section hearth design that reduces the heating time, and allows for process scalability from laboratory to production volumes. The eductor driven convection can be operated in air, Nitrogen, Hydrogen, or forming gas. The system offers maximum reliability through the use of high purity Alumina refractory bricking, and advanced operational and safety controls and software.

Atmosphere Convection
BTU Eductor system is used for controlled atmosphere convection from 200°C to 1800°C operations.
PC Based Control
PC based control software available to simplify operation of the furnace system.
Custom Refractory Materials
BTU 99.5% Alumina bricking used on the hot face for process temperatures above 1400°C to eliminate product reactions and provide for easy maintenance.
Ball Screw Driven Elevator Mechanism
Ball screw lift mechanisms provide safe and reliable vibration free product movement, eliminating damage to parts. Safety mechanical interlocks are engaged when the hearth in is the up position.
Independent Over Temperature Control
Independent Over Temperature Control for safe and reliable operation of the furnace.

Hydrogen Atmosphere
Up to 100% Hydrogen atmosphere operation is available for metals and advanced materials processing.
Gas Saturator
Maintains proper dew point conditions through closed loop temperature and water level control.
Closed Loop Oxygen Control
Precision control of O2 levels from 20.9% down to 1x10-22 pO2 through continuous process atmosphere sampling and Zirconia cell sensors.

Slow Ramp Control
For products requiring slow ramp rates for binder removal, BTU achieves less than 1°C/hour ramps using unique process controls.
Dual Hearth Operation
Dual hearths allow for loading and unloading one hearth while second is in firing.
Automated Loading and Unloading
Can be supplied using robotics and materials handling systems.

Maximum Temperature

1600°C MoSi2 or SiC
1400°C MoSi2  or Molybdenum Ribbon
1250°C Molybdenum Ribbon
1000°C NiCr Coil

Temperature Uniformity

As low as +/-5°C

Chamber Width

18 in. / 457 mm

Chamber Height

20 in. / 508 mm

Chamber Length

Throughput Dependent

Atmospheres Available

Air/Nitrogen/Hydrogen

Voltages

480 Volt 3 Phase
415 / 240 Volt 4 Wire
380 / 220 Volt 4 Wire
Other Voltages available