Frictional Heating and Contact Temperatures

A fast-response thin film thermocouple to measure rapid surface temperature changes

https://www.lehigh.edu/~intribos/papers/Krick_11.pdf

In situ thermal measurements of sliding contacts

The effect of thermal conductivity and friction coefficient on the contact temperature of polyimide composites: Experimental and finite element simulation

A pulsed laser heat source method for measuring the transient thermal response of thin-film thermocouples (TFTCs) is shown to obtain results for the temperature jump and temporal response which are consistent with those predicted employing a simple model. Some deviation from this model is observed for the thinnest films on alumina, which has a very high thermal conductivity, and on Min-K 2000, which has a very low thermal conductivity. Poor adherence of the thin film to the substrates, the interface thermal conductance, is suggested to be the origin of this effect. The technique is determined to be sensitive to the thermal properties of the substrate on dimensions of the thermal diffusion lengths. This experimental method is preferable to calculations of the thermal response of the TFTCs based on bulk thermal data. It should prove useful as a method for characterizing in situ TFTCs, which may vary from batch to batch.

Transient thermal response of plasma-sprayed zirconia measured with thin-film thermocouples

We have developed a thin‐film Pt–Ir thermocouple which exhibits bulklike thermoelectric behavior up to 790 °C, the highest temperature observed with thin‐film pure‐element thermocouples. Using a Q‐switched Nd:YAG laser and a signal averaging oscilloscope, its thermal response time was measured to be 60 ns. The ease of implementation in electronic devices coupled with the reproducibility over a wide temperature range make this thin‐film thermocouple well suited for monitoring instantaneous temperatures during device processing.

J. J. Ritsko

Papers

High‐temperature thin‐film Pt–Ir thermocouple with fast time response