A Method Of Calculating Thermal Diffusivity And Conductivity For Irregularly Shaped Specimens In Laser Flash Analysis

• Autorzy: Szałapak J. , Kiełbasiński K. , Krzemiński J. , Młożniak A. , Zwierkowska E. , Jakubowska M. , Pawłowski R.

Identyfikatory

DOI

10.1515/mms-2015-0043

• Języki publikacji: EN

Abstrakty

EN

The Low Temperature Joining Technique (LTJT) using silver compounds enables to significantly increase the thermal conductivity between joined elements, which is much higher than for soldered joints. However, it also makes difficult to measure the thermal conductivity of the joint. The Laser Flash Analysis (LFA) is a non-intrusive method of measuring the temperature rise of one surface of a specimen after excitation with a laser pulse of its other surface. The main limitation of the LFA method is its standard computer software, which assumes the dimensions of a bonded component to be similar to those of the substrate, because it uses the standard Parker’s formula dedicated for one-dimensional heat flow. In the paper a special design of measured specimen was proposed, consisting of two copper plates of different size joined with the sintered silver layer. It was shown that heat properties of these specimens can also be measured after modifying the LFA method. The authors adapted these specimens by masking the false heat signal sourced from the uncovered plate area. Another adaptation was introducing a correcting factor of the heat travel distance, which was calculated with heat-flow simulations and placed into the Parker’s formula. The heat-flow simulated data were compared with the real LFA measurement results, which enabled estimation of the joint properties, e.g. its porosity.

Słowa kluczowe

EN

thermal diffusivity; LFA; LTJT joints; high power electronics

• Wydawca: Komitet Metrologii i Aparatury Naukowej PAN
• Czasopismo: Metrology and Measurement Systems
• Rocznik: 2015
• Tom: Vol. 22, nr 4
• Strony: 521--530
• Opis fizyczny: Bibliogr. 10 poz., rys., tab., wykr., wzory

Twórcy

autor

Szałapak J.

• Warsaw University of Technology, Faculty of Mechatronics, Św. Andrzeja Boboli 8, 02-525 Warsaw, Poland
• Institute of Electronic Materials Technology, Wólczyńska 133, 01-919, Warsaw, Poland

autor

Kiełbasiński K.

• Institute of Electronic Materials Technology, Wólczyńska 133, 01-919, Warsaw, Poland

autor

Krzemiński J.

• Warsaw University of Technology, Faculty of Mechatronics, Św. Andrzeja Boboli 8, 02-525 Warsaw, Poland

autor

Młożniak A.

• Institute of Electronic Materials Technology, Wólczyńska 133, 01-919, Warsaw, Poland

autor

Zwierkowska E.

• Institute of Electronic Materials Technology, Wólczyńska 133, 01-919, Warsaw, Poland

autor

Jakubowska M.

• Warsaw University of Technology, Faculty of Mechatronics, Św. Andrzeja Boboli 8, 02-525 Warsaw, Poland
• Institute of Electronic Materials Technology, Wólczyńska 133, 01-919, Warsaw, Poland

autor

Pawłowski R.

• Abraxas, ul. Piaskowa 27, 44-300 Wodzisław Śląski, Poland

Bibliografia

• [1] Baba, T., Ono, A. (2001). Improvement of the laser flash method to reduce uncertainty in thermal diffusivity measurements. Meas. Sci. Technol., 12, 2046.
• [2] Parker, W.J., Jenkins, R.J., Butler, C.P., Abbott, G.L. (1961). Flash Method of Determining Thermal Diffusivity, Heat Capacity, and Thermal Conductivity. J. Appl. Phys., 32, 1679.
• [3] Carslaw, H.S., Jaeger, J.C. (1959). Conduction of Heat in Solids. New York: Oxford University Press.
• [4] Campbell, R.C., Smith, S.E., Dietz, R.L. (1999). Measurements of adhesive bondline effective thermal conductivity and thermal resistance using the laser flash method. Semiconductor Thermal Measurement and Management Symposium, 15th Annual IEEE.
• [5] Coquard, R., Panel, B. (2009). Adaptation of the FLASH method to the measurement of the thermal conductivity of liquids or pasty materials. International Journal of Thermal Sciences, 48(4), 747-760.
• [6] Wang, T., Zhao, M., Chen, X., Lu, G.Q., Ngo, K., Luo, S. (2012). Shrinkage and Sintering Behavior of a Low-Temperature Sinterable Nanosilver Die-Attach Paste. Journal of Electronic Materials, 41(9).
• [7] Jakubowska, M., Jarosz, M., Kiełbasiński, K., Szałapak, J., Młożniak, A. (2012). Thick-film screen printable pastes based on silver powders for die-attachment applications. Proc. IMAPS-CPMT, Poland, 256-268.
• [8] Mina, S., Blumm, J., Lindemann, A. (2007). A new laser flash system for measurement of the thermophysical properties. Thermochimica Acta, 455(1-2), 46-49.
• [9] Chudzik, S., Minkina, W. (2011). An idea of a measurement system for determining thermal parameters of heat insulation Mmaterials. Metrol. Meas. Syst., 17(2), 261-274.
• [10] Frankiewicz, M., Gołda, A., Kos, A. (2014). Investigation of heat transfer in integrated circuits. Metrol. Meas. Syst., 21(1), 111-120.

Uwagi

EN

This work was partially financed by the European Union within the NCBR project No. UOD-DEM-1-215/001.