SU1615572A1 - Sending unit of heat flow - Google Patents

Abstract

The invention relates to thermometry and allows for improved measurement accuracy in local areas. Electrodes of a thermoelectric battery are made of one alloy, with the following ratio of components: iron 3-14, wt.%, Aluminum - the rest, but have a different structure - crystalline and with quasicrystalline, icosahedral inclusions (CIV) in an amount of more than 10 vol.%. Reducing the grain size in the AL-FE alloy will significantly reduce the size of the sensor. The presence of thermocouples in the electrodes that form a thermoelectric battery, KIV leads to increased thermoelectric and temporal stability.

Description

The invention relates to the field of thermometry and can be used to measure unsteady heat fluxes ..,

V.

The purpose of the invention is to improve the measurement accuracy in local areas of objects.

The iron content in the Al – Fe alloy is less than 3 mass%, it is not possible to obtain a structure with quasicrystalline inclusions in an amount necessary for the formation of stable thermoEMF. An iron content of more than 14 wt.% Results in a drastic decrease in the thermoelectric stability of the battery due to a decrease in the thermal stability of the alloy due to the fact that part of the iron in it segregates at the grain boundaries.

The original alloy for the sensor thermopile is melted in an induction furnace in an argon atmosphere. Melted alloy

quenched from the melt on a copper disk, rotating at a speed of 20.5-50.3 m / s. From the thus obtained quasicrystalline billet wound spiral. The helix regions are heated to a temperature of 450 ° C to form a crystalline structure, resulting in alternating regions with a crystalline structure and regions containing quasicrystalline, icosahedral inclusions (CIV).

 A KIV content of less than 10 vol.% Does not lead to the appearance of stable thermoelectric power in a battery. The number of inclusions is monitored by x-ray.

The presence of thermocouples in the electrode sections, of which the thermoelectric battery consists, CIV leads to an increase in the thermoelectric and temporal stability due to the anomalously high thermal stability of the alloy.

When measuring the heat flux of the sensor thermopile, the electrodes of which are formed from the same material (metal alloy) but are in different structural states, it generates thermoEMF proportional to the temperature gradient between the hot and cold thermocouple thermocouples. ThermoEMF is recorded by a measuring instrument.

The number of measuring elements per unit length in sensors formed by electrodes from a homogeneous material composition, which are in different structural states, is determined by the grain size in the alloy. A microstructural study made it possible to establish that the grain size in the alloy for this sensor is 0.01-0.5 µm, and therefore the sensor is highly sensitive due to the possibility of increasing the number of thermocouples per unit length. Reducing the grain size in the A1 - Fe alloy allows for a significant 0

five

0

but to reduce the size of the sensor, so that it can be used to measure various objects in local areas in the temperature range 20–540 ° C.

Claims (1)

Claims of the Invention A heat flux sensor comprising a thermoelectric battery of a homogeneous metal alloy, whose electrodes are formed by areas in different structural states, while the structure of some sections is crystalline, characterized in that local areas of objects, in it the thermoelectric battery is made of alloy A1 - Fe with the following ratio of components, wt.%: Fe3-14 A1 Else and in the structure of the second sections of the electrodes quasicrystalline inclusions are formed in the amount of more than 10 vol.%.