TY - CHAP A1 - Abo Ras, Mohamad A1 - May, Daniel A1 - Schacht, Ralph A1 - Bast, M. A1 - Eisle, R. A1 - Michel, Bernd A1 - Winkler, Thomas A1 - Rzepka, Sven A1 - Wunderle, Bernhard T1 - "LaTIMA" an Innovative Test Stand for Thermal and Electrical Characterization of Highly Conductive Metals, Die Attach, and Substrate Materials T2 - 21st International Workshop on Thermal Investigations of ICs and Systems, Sept. 30 2015 - Oct. 2 2015 N2 - This paper deals with the development of an innovative test stand for the measurement of thermal and electrical conductivity of metals, semiconductors, highly conductive die attaches and substrates using the steady state technique for thermal characterization and four-terminal sensing with pulse delta technique for electrical characterization. We present a systematic study of sintered silver in order to investigate the influence of sintering conditions on thermal and electrical properties. Several sintered silver samples have been prepared under sintering temperature variation between 200°C and 270°C and sintering pressure variation between 5 MPa and 25 MPa. The characterization results diversify up to 200% for thermal conductivity and up to 330% for electrical conductivity. The Wiedemann-France law describes the relationship between electrical and thermal conductivities for bulk metals. We proved that this law applies not only for bulk metal but also for porous sintered metal. KW - Thermal characterization KW - electrical characterization KW - highly conductive metals KW - die attach KW - substrate materials Y1 - 2015 UR - www.therminic2015.eu SN - 978-1-4673-9705-6 N1 - Best paper award PB - IEEE CY - Piscataway, NJ ER - TY - CHAP A1 - Schacht, Ralph A1 - Hausdorf, Alexander A1 - Wunderle, Bernhard A1 - Rzepka, Sven A1 - Michel, Bernd T1 - Efficiency optimization for a frictionless air flow blade fan – design study T2 - 14th IEEE ITHERM Conference, Orlando(Fl), USA, May 30th, 2014 N2 - This paper resumes the frictionless fan concept which was introduced at itherm 2012 [1]. This concept was based on a flexible polymer blade, the vibration of which is, as opposite to the piezoelectric driven fan principle, driven by means of a magnetic field. This type of fan can be of interest in regions where otherwise the fluid flow would be stagnant. This paper presents the results of a further in depth design study to reduce power loss and form factor as well as to optimize fan efficiency. Therefore, different blade materials and shapes, different sheet materials for the inductive stimulation as well as the influence of coil shape, value and number were under investigation. As a result, the size could be reduced by half and the efficiency could be doubled. A maximum flow rate of 14 l/min and a static pressure of 3 Pa at 240 mW fan power could be reached. KW - frictionless cooling KW - reliable air flow fan KW - thermal management KW - nearly noiseless cooling Y1 - 2014 SN - 978-1-4799-5267-0 SP - 1019 EP - 1026 PB - IEEE CY - Piscataway, NJ ER -