ГЭТ 24-2018 (НИЛ 2416)
Standard name:
- ГЭТ 24-2018 State Primary Standard of the Unit of Thermal Coefficient of Linear Expansion of Solids
Type of measurement:
- Thermophysical and temperature measurements
Structural division: name НИО\НИЛ:
- Laboratory of standards and scientific research in the field of thermal expansion measurements
Guardian Scientist:
- Kompan Tatyana Andreevna
Year of creation:
- 1972
Year of re-confirmation:
- 2018
Operating principle:
The standard operates in the temperature range from 90 to 1800 K using the interference method for measuring elongation (the Fizeau interferometer), with temperature measured using a standard resistance thermometer/thermoelectric transducer. In the temperature range above 1800 K, paired telemicroscopy is used to measure elongation, with temperature measured using a pyrometer.
Composition of the standard:
The state primary standard of the unit of thermal expansion coefficient of solids consists of the following measuring instruments:
- Dilatometer for the temperature range from 90 to 400 K;
- Dilatometer for the temperature range from 300 to 1800 K;
- Dilatometer for the temperature range from 1000 to 3000 K;
- Measures of thermal expansion coefficient of solids for monitoring the stability of standard dilatometers.
Verification diagram:
- Heads the state verification scheme for measuring instruments of the thermal coefficient of linear expansion of solids in the range from 0.01 x 10[^-6] to 100 x 10[^-6] K[^-1] in the temperature range from 90 to 3000 K.
Scope of application:
The scope of application covers ensuring the uniformity of ТКЛР measurements for solids in the temperature range from 90 to 3000 K. The standard is intended for enterprises and research institutes working in priority areas of science, technology, and engineering in the Russian Federation and developing materials and products for use in extreme conditions, particularly at variable temperatures. These are enterprises of the military-industrial complex, the rocket and space complex, the aviation and automotive industries, nuclear energy, and materials science.The standard enables testing of the thermophysical properties of structural and composite materials under development: metals and alloys, including nanostructured ones, glass-nanoceramics, nanoporous and nanocrystalline oxides of zirconium, aluminum, silicon, composite materials, graphite, and carbides. Key users include materials science, metallurgy, glass, electronics, aerospace, and general engineering.
Results of applying the standard:
The problems of verification, calibration, and testing of thermal expansion measuring instruments for materials operating in the high-temperature range (up to 3000 K) have been resolved, as well as the thermal expansion coefficient (TCLE) certification of materials operating at variable temperatures. TCLE process control has been ensured for the production of new materials in this temperature range.
The development of a metrological support system for high temperatures is primarily aimed at enterprises in the military-industrial complex, the rocket and space industry, the automotive and aviation industries, nuclear power, and developers of structural and composite materials.
The total number of measuring instruments traceable to ГЭТ 24-2018:
More than 400
Ensuring the uniformity of measurements, participation in the CIPM MRA program:
No comparisons were conducted
Unique technical installations as part of the standard:
None
PHOTO:
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/Дилатометр ДИС-7 для диапазона температуры от 90 до 400 К.png)
Dilatometer ДИС-7 for temperature range from 90 to 400 K
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/Дилатометр ДИВ-6 для диапазона температуры от 300 до 1800 К.png)
Dilatometer ДИВ-6 for temperature range from 300 to 1800 K
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/Дилатометр ДОВ-1 для диапазона температуры от 1000 до 3000 К.png)
Dilatometer ДОВ-1 for temperature range from 1000 to 3000 K
