High-Temperature Tube Furnace

What is the High-Temperature Tube Furnace?

A high-temperature tube furnace heats a work tube to 1600 to 1700 C with gas flow or vacuum for controlled-atmosphere processing. It is chosen for sintering, crystal growth and reactions that need the highest temperatures in a tube geometry.

Overview

This furnace combines tube geometry with high-temperature construction, using molybdenum disilicide elements and an alumina work tube of 40 to 100 mm diameter. Working temperature reaches 1600 to 1700 C, though the tube material and seals limit the top end, and gas flow or vacuum keeps the sample atmosphere controlled. Hot zones run 200 to 600 mm, with uniformity of plus or minus 5 to 10 C. A type B or S thermocouple measures temperature, and a programmable controller runs slow ramps. End flanges carry gas lines and, where required, a vacuum pump or an oxygen sensor. It serves sintering of advanced ceramics, crystal growth, calcination under inert gas and reactions where contamination must be avoided.

How does it work?

High-temperature furnaces concentrate heat in a densely insulated hot zone using elements that remain stable at extreme temperature. Silicon carbide and molybdenum disilicide resist oxidation in air to about 1600 to 1800 C, while graphite and tungsten elements work beyond 2000 C under vacuum or inert gas because they oxidize in air. Induction furnaces instead use an alternating magnetic field to induce currents in a conductive crucible or susceptor, heating the charge directly. Dense alumina, zirconia or graphite insulation limits heat loss, and water-cooled shells protect the structure. Type B or C thermocouples, optical pyrometers and radiation sensors cover the range, and programmable controllers follow slow ramp profiles that avoid thermal shock. Atmosphere control is often essential to prevent oxidation, evaporation or contamination of the sample.

What are the key features?

• Molybdenum disilicide elements for 1600 to 1700 C
• Alumina work tube of 40 to 100 mm
• Gas flow or vacuum capability
• Type B or S thermocouple
• Slow programmed ramp capability
• End flanges with gas and vacuum ports

What are the technical specifications?

A typical high-temperature tube furnace configuration offers work tube diameter of 40–100 mm, hot zone length of 200–600 mm, temperature range of RT to 1700 C, temperature uniformity of ±5–10 C, tube material of Alumina or mullite and heating element of Molybdenum disilicide. Values are indicative of the product class; the exact figures for each configuration are confirmed on the quotation and the calibration documents supplied with the instrument.

Which applications is it used for?

The High-Temperature Tube Furnace is used in advanced ceramic sintering, crystal growth under atmosphere, inert-gas calcination and high-temperature reaction studies. Across the wider High Temperature Furnaces class, laboratories also deploy it for advanced ceramic sintering, refractory material testing and glass and frit melting.

Which standards and certifications apply?

Relevant standards and methods include IEC 61010-1, IEC 61010-2-010, IEC 60519-1, DIN 17052-1, ISO 9001 and ISO 17025. Certification candidates for this model are CE, ISO 9001 manufacturing and RoHS; each is to be confirmed for the specific configuration before shipment, and certificates are supplied only where they have been issued.

High-temperature furnaces need rigid foundations, generous clearances and, for water-cooled types, reliable cooling with flow and temperature interlocks. Install gas and vacuum lines with proper purging and leak checking, and never heat a graphite or refractory-metal element in air. Warm up and cool slowly according to the schedule to protect dense refractories and elements from thermal shock. Replace elements and thermocouples as matched sets and on condition. Verify temperature with a reference instrument and profile the hot zone periodically, keep records, and train operators on atmosphere, water and emergency shutdown procedures.

How do I select the right High-Temperature Tube Furnace?

Select the high-temperature tube furnace when gas flow or vacuum plus 1600 C or more is required. Standard tube furnaces cover lower temperatures more cheaply. In the RFQ, specify tube diameter, hot zone, top temperature, atmosphere and end-seal requirements.

How does it compare with other High Temperature Furnaces variants?

Choose a high-temperature furnace only when the process genuinely needs 1400 C or above, since cost, element life and atmosphere requirements rise steeply with temperature. Decide the atmosphere first: air, inert gas, vacuum or reducing, because elements and insulation depend on it. Then set the maximum temperature and hot zone size from the sample and crucible, and select the heating method, with resistance for clean work and induction for melting conductive charges. Confirm the temperature measurement method for the range, since thermocouples need type B or C and optical pyrometers are used above about 1800 C. Specify ramping capability, cooling, water supply and safety protection.