Hornos de alta temperatura

Los hornos de alta temperatura para ensayos en un rango de temperatura entre +200 °C y 1.600 °C sirven para determinar el comportamiento termo-elástico, la resistencia al calor y la temperatura de recristalización de los diferentes materiales.

Switching and Control System

At the center of every high-temperature test lies exact temperature control along the specimen. The temperature controller developed by ZwickRoell and proven for many years, ensures reproducible and user-independent temperature control of the specimen during every test. The switching and control system meets all requirements of the current international test standards such as DIN EN ISO 204, DIN EN ISO 6892-2, ASTM E139, ASTM E21.

Advantages and features

  • Intelligent control algorithms ensure that the specimen temperature is reached and maintained in compliance with the standards without overshooting, as well as temperature stability along the sample
  • Empirically determined control parameters for different specimen temperatures are no longer necessary
  • Automatic controller setting in a temperature range of 200 °C to 1200 °C
  • Temperature tolerance on specimen, max. parallel length 100 mm:
    - 200°C to 350°C: ± 2K
    - 350°C to 1200°C: ± 1K
  • Digital display of temperatures
  • Suitable for stand-alone operation and PC operation with testXpert II / testXpert III testing software
  • Not tied to specimen thermal element types

Specimen Temperature Measuring Device

For exact specimen and furnace temperature control, the use of a suitable specimen temperature measuring device is necessary. Depending on the specimen geometry and the specimen spectrum, fixed or variable measuring devices with different thermal elements (Type K, N, S,...) are used. To ensure constant temperature along the specimen, normally three thermal elements are attached to the surface of the specimen.

Load Strings

Load string for tensile tests

The high-temperature load string consists of:

  • Pull-rod mounting
  • Pull rod
  • Specimen adapter

The high-temperature load string transmits the force from the high-temperature specimen adapters in the furnace to the pull-rod mountings outside the furnace.

Therefore, the pull-rods as well as the specimen adapter must stand up to the particular thermal loads in high-temperature testing. Metallic high-temperature pull-rods are ideal for use up to a max. of 1,200°C and ceramic high-temperature pull-rods up to 1,500°C.

Load string for compression and flexure tests

Compression and flexure tests up to 1,500°C in air are performed with a ceramic load string. The die is typically fixed; the flexure test kit fully articulable to ASTM C1211. With the compression fixture, loads up to approx.10 kN can be applied; the flexure fixture allows loads of approx. 2 kN.

Load string for compression testing with reversal cage

Compression tests can also be performed with a reversal cage. Here the tensile force is converted to compression force through the reversal cage. Compression tests up to 1200°C can be performed in air as well as in vacuum. The benefit of the reversal cage lies in the high stability of the arrangement and low conversion effort from compression to tensile tests.

Extensometers

ZwickRoell offers a comprehensive selection of extension measurement systems with different resolutions, measuring principles, and measurement displacement. A distinction is generally made between contact and non-contact measurement of extension, change in width, or strain. The special requirements in high-temperature testing are taken into account with specially designed extensometers.
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