International ournal of Applied Ceramic Technolog-Sebastian and Jantunen Vol.7,No.4,2010 Table l. continued ef TLY PTFE woven glass 2.17-2 0.0009 10GHz Taconic TLX PTFE woven glass 2.45-2.65 0.0019 10 GHz Taconic 0.0004 10 GHz Taconic RF-60A 10 GHz Taconic RF-41,RF-43,RF-45 4.10-1.500.0033-0.003810 GHz Taconic TRF-4l, TRF-43, PTFE woven glass 4.1-4.5 00035 10GHz Taconic TRF-45 RF.30 3.00 0.0014 1.9 GHz Taconic HyRelex 0.0020 10GHz Taconic Cer-10 10.0 0.0035 10 GHz Taconic Arlon 25FR and 25N 3.38 0.0025 10 GHz Arlon SPEEDBOARD C 0.004 10GHz Barnes FASTRISE 27 10GHZ Taconic TSM29 10GHz Taconic CLTE 294-3.000.0012-0.0023 AD320 2.55-4.30.0015-0.0035 AD410A 0.0023 Arlon 6.00 AR1000 0.003 25N DiClad 880-PIM 2.17 0.0009 Iso Clad 91 2.17 CuClad 250 GT Nelco N4000-13 Nelco 4000-13 SI 0.008 10GHZ Nelo elco-400013SI 3.30 times as compared with the pure epoxy. Additionally, determine the precise value of the thermal conductivity polymer-ceramic composites are commonly used of composite materials. The following models are used electronic substrates and for packaging to dissipate to calculate the effective thermal conductivity of poly he heat generated in the electronic devices. The mer-ceramic composites thermal conductivity of the polymer is generally very l Geometric mean model. low. It was reported that the addition of a high thermal It is a simple model to predict the thermal conduc conductivitymaterial such as aluminum nitride tivity of a two-component composite. 00 The thermal as a filler effectively increases the thermal con- conductivity is given by of polymers or polymer-ceramic comp 3298.99 kerr=k ikI-w Determining the thermal conductivity of o materials is crucial in a number of industrial processes. where kef, kb, and km are the thermal conductivities of The effective thermal conductivity of a heterogeneous the composite, filler, and matrix, respectively material is strongly affected by its composition, crystal 2. EMT model: structure, distribution within the medium. and contact The EMT assumes that the composite system is a he between the particles. Several models and experimental m us medium and the EMT equation for thermal onductivity can be derived through the Laplace equationtimes as compared with the pure epoxy. Additionally, polymer–ceramic composites are commonly used as electronic substrates and for packaging to dissipate the heat generated in the electronic devices. The thermal conductivity of the polymer is generally very low. It was reported that the addition of a high thermal conductivity material such as aluminum nitride as a filler effectively increases the thermal con￾ductivity of polymers or polymer–ceramic compos￾ites.32,98,99 Determining the thermal conductivity of composite materials is crucial in a number of industrial processes. The effective thermal conductivity of a heterogeneous material is strongly affected by its composition, crystal structure, distribution within the medium, and contact between the particles. Several models and experimental approaches have been reported100–111 to predict and determine the precise value of the thermal conductivity of composite materials. The following models are used to calculate the effective thermal conductivity of poly￾mer–ceramic composites: 1. Geometric mean model: It is a simple model to predict the thermal conduc￾tivity of a two-component composite.100 The thermal conductivity is given by keff ¼ kVf f k1Vf m ð8Þ where keff, kf, and km are the thermal conductivities of the composite, filler, and matrix, respectively. 2. EMT model: The EMT assumes that the composite system is a ho￾mogeneous medium and the EMT equation for thermal conductivity can be derived through the Laplace equation Table I. Continued Polymer Filler Vf er Tan d Fo Ref TLY PTFE woven glass 2.17–2.4 0.0009 10 GHz Taconic TLX PTFE woven glass 2.45–2.65 0.0019 10 GHz Taconic Taclamplus 2.1 0.0004 10 GHz Taconic RF-60A 6.15 0.0038 10 GHz Taconic RF-41, RF-43, RF-45 4.10–4.50 0.0033–0.0038 10 GHz Taconic TRF-41, TRF-43, TRF-45 PTFE woven glass reinforced 4.1–4.5 0.0035 10 GHz Taconic RF-30 3.00 0.0014 1.9 GHz Taconic HyRelex 2.6 0.0020 10 GHz Taconic Cer-10 10.0 0.0035 10 GHz Taconic Arlon 25FR and 25 N 3.38 0.0025 10 GHz Arlon SPEEDBOARD C 2.6 0.004 10 GHz Barnes et al. 96 FASTRISE 27 2.7 0.0020 10 GHZ Taconic TSM29 2.94 0.0014 10 GHz Taconic CLTE 2.94–3.00 0.0012–0.0023 Arlon TC350 3.5 0.0020 Arlon TC600 6.15 0.0020 Arlon AD255A, AD260, AD300A, AD320A, AD350A, AD410A, AD430A 2.55–4.3 0.0015–0.0035 Arlon AD1000A 10.2 0.0023 Arlon AD600 6.00 0.003 Arlon AR1000 9.8 0.003 Arlon 25N 3.38 0.0025 Arlon 25FR 3.58 0.0035 Arlon DiClad 880-PIM 2.17 0.0009 Arlon IsoClad 917 2.17 0.0013 Arlon CuClad 250 GT 2.40 0.001 Arlon Nelco N4000-13 3.70 0.008 Nelco Nelco 4000-13 SI 3.4 0.008 10 GHZ Nelco Nelco-400013SI 3.30 0.007 Nelco 424 International Journal of Applied Ceramic Technology—Sebastian and Jantunen Vol. 7, No. 4, 2010