Hi-Trace

Thermal contact resistance

The aim of this workpage is to develop and validate methods to quantify the state of interface bonding between solid materials. The idea is to use methods for measuring thermal contact resistance by dynamic heating and the results of this will be used to develop and validate a model for quantifying the state of interfacial bonding (between coating and substrate for example), with a focus on functional layers appropriate for use as thermal or corrosion protection above 1000 °C.

Temperature rise distribution on the rear face half-way through the test. — NPL Matlab model

The work will be split into five tasks:

Development of a new measurement method based on a laser-flash appropriate for use above 1000 °C. The selection of suitable spectral ranges for investigation will be performed using spectroscopic methods and for detecting partial delamination or lateral reduction of interface bonding, respectively. An improved thermal imaging setup will be developed in order provide input data for the development of an improved laser-flash method.
Development numerical models for quantifying the state of interface adhesion by evaluating the thermal contact resistance of poor interfaces in layered systems in compliance with measurements methods.
Development and characterization of multilayer artefacts (tests pieces and components) suitable for high-temperature.
Metrological validation of the new measurement method and the numerical models.
Finally the new methodology developed and validated in this project will be applied to characterise selected industrial multi-layer material systems.

Contact
Jiyu Wu (WP leader)
jiyu.wu@npl.co.uk

The project will establish new methods for characterising the thermophysical properties of any solid material up to 3000 °C, and launch a network of reference facilities and materials available to industry. By supporting reliable measurement practices, this project will improve the understanding of high-temperature materials and enable industries such as the aeronautics and energy sectors to develop novel and innovative materials)

Contact

Project management
Bruno Hay
Bruno.Hay@lne.fr

Impact
Jürgen Hartmann
Juergen.Hartmann@fhws.de

Project Website
Jochen Manara
Jochen.Manara@zae-bayern.de