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Characterisation of Electrical Resistance for CMC Materials up to 1200 °C

Stäbler, Tina and Böhrk, Hannah and Voggenreiter, Heinz (2016) Characterisation of Electrical Resistance for CMC Materials up to 1200 °C. 6th International Conference on Materials and Applications for Sensors and Transducers, 27.-30. Sep. 2016, Athen, Griechenland.

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Damage to thermal protection systems (TPS) during atmospheric re-entry is a severe safety issue, especially when considering re-usability of space transportation systems. There is a need for structural health monitoring systems and non-destructive inspection methods. However, damages are hard to detect. When ceramic matrix composites, in this case carbon fibre reinforced silicon carbide (C/C-SiC), are used as a TPS, the electrical properties of the present semiconductor material can be used for health monitoring, since the resistivity changes with damage, strain and temperature. In this work the electrical resistivity as a function of the material temperature is analysed eliminating effects of thermal electricity and the thermal coefficient of electrical resistance is determined. A sensor network is applied for locally and time resolved monitoring of the 300 mm x 120 mm x 3 mm panel shaped samples. Since the material is used for atmospheric re-entry it needs to be characterised for a wide range of temperatures, in this case as high as 1200 °C. Therefore, experiments in an inductively heated test bench were conducted. Firstly, a reference sample was used with thermocouples for characterising the temperature distribution across the sample surface. Secondly, electrical resistance under heat load was measured, time and spatially resolved. Results will be shown and discussed in terms of resistance dependence on temperature, thermal coefficient of electrical resistance, thermal electricity and electrical path orientation including an analysis on effective conducting cross section. Conversely, the thermal coefficient can also be used to determine the material temperature as a function of electrical resistance.

Item URL in elib:https://elib.dlr.de/108921/
Document Type:Conference or Workshop Item (Speech)
Title:Characterisation of Electrical Resistance for CMC Materials up to 1200 °C
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Stäbler, TinaTina.Staebler (at) dlr.deUNSPECIFIED
Böhrk, Hannahhannah.boehrk (at) dlr.deUNSPECIFIED
Voggenreiter, Heinzheinz.voggenreiter (at) dlr.deUNSPECIFIED
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:Health Monitoring, Resistance Measurement
Event Title:6th International Conference on Materials and Applications for Sensors and Transducers
Event Location:Athen, Griechenland
Event Type:international Conference
Event Dates:27.-30. Sep. 2016
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Transport
DLR - Research area:Raumfahrt
DLR - Program:R RP - Raumtransport
DLR - Research theme (Project):R - Shefex III, R - Fligthexperiment Newfex
Location: Stuttgart
Institutes and Institutions:Institute of Structures and Design > Space System Integration
Deposited By: Stäbler, Tina
Deposited On:19 Dec 2016 11:05
Last Modified:19 Dec 2016 11:05

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