Laser Thermal Shock Experiments - Performance and Evaluation on the Basis of Advanced Ceramics

The thermal shock behaviour in air and vacuum of three different advanced ceramics is investigated by introducing a new testing method. This thermal shock testing system permits the reproducible setting of defined temperature profiles in thin disks. In order to perform heating - up thermal shock exp...

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Bibliographic Details
Published inIOP conference series. Materials Science and Engineering Vol. 18; no. 20; pp. 202019 - 4
Main Authors Pulz, Robert, Rehmer, Birgit
Format Journal Article
LanguageEnglish
Published Bristol IOP Publishing 29.10.2011
Subjects
Ceramics
Disks
Failure
Heating
Laser beams
Statistical methods
Temperature distribution
Temperature gradient
Temperature profiles
Thermal conductivity
Thermal shock
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Summary:The thermal shock behaviour in air and vacuum of three different advanced ceramics is investigated by introducing a new testing method. This thermal shock testing system permits the reproducible setting of defined temperature profiles in thin disks. In order to perform heating - up thermal shock experiments under reproducible conditions and to measure the transient temperature fields, a laser beam is directed spirally across the surface of the specimen. In this process, the specimen is heated up faster than the temperature gradient is compensated by thermal conductivity. Resulting temperature fields were recorded space and time resolved. Based on the knowledge of the local temperature distribution at the moment of failure, the critical fracture stress can be calculated. The scatter of thermal shock strength is quantitatively determined for the tested ceramics by using a improved statistical method.
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ISSN:1757-899X
1757-8981
1757-899X
DOI:10.1088/1757-899X/18/20/202019