Characterization of Pressure-less Ag-Sinter using Innovative Sample Preparation Approach

Murali, Sarangapani; Evonne, Lim Yee Weon; Yuan, Chieng Yu; Wan, Lo Miew; Sungsig, SS Kang; Dennis, Ang Kwang Leong

doi:10.1109/ectc32696.2021.00343

Cited by 1 publication

(6 citation statements)

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“…The sample is tested for the temperature range from 25 to 200°C. CTE value is close to reported in the literature [1]. Specific heat capacity measured as per ASTM E1269 standard using differential scanning calorimetry (DSC) revealed about 0.24 J/g°K (Table 1).…”

Section: IIIsupporting

confidence: 85%

“…poreblack, networked Ag-2 sinter particleswhite). The pore area is measured using Image-Pro 10.0.6 software and % porosities are calculated as a ratio between the pore area and the observed fixed rectangular area [1]. Density of these samples are measured by Archimedes principles and % porosities are calculated as a ratio between the solid rod and the density of measured structure.…”

Section: Porosity Of Pressure-less Ag-sintermentioning

confidence: 99%

“…Information on the characterization of Ag-sinter (scientific tools for measurement, standard test procedures, sample preparation, etc.) is limited to finding thermal, mechanical, and electrical properties [1][2][3][4][5]. Present study enumerates the importance of porosity in the Ag-sinter that impacts its properties.…”

Section: Introductionmentioning

confidence: 99%

“…Present study enumerates the importance of porosity in the Ag-sinter that impacts its properties. Porosity is measured by cross-section (2-dimensional (2D) area fraction measurement) and density measurement by Archimedes principles [1]. This paper reports a cross-sectional method of measurement.…”

Section: Introductionmentioning

confidence: 99%

“…Electrical resistivity of the sintered layer is measured using the 4-probe method. Thermal properties such as specific heat capacity (Cp), coefficient of thermal expansion (CTE), thermal diffusivity, and thermal conductivity of the Ag-sinter are obtained using Differential Scanning Calorimetry (DSC), Thermomechanical Analyzer (TMA), and Thermal Interface Material Analyzer (TIMA) [1]. Elastic modulus (E-modulus) is obtained using an ultrasonic method with a sample of thickness of 13mm.…”

Section: Introductionmentioning

confidence: 99%

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Pressure-less Ag-Sinter: Necking, Pores Structure and Its Properties

Murali,

Wan,

Long Wee Seng

et al. 2024

IMAPSource Proceedings

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Pressure-less Ag-sinter die-attach structure revealed good-networked silver interconnects along with discontinuous shrinkage porosities. A thin sheet test sample is processed to be evaluated with commercially available test equipment. In this study, test samples are stencil printed to a thickness from 70 to 100 µm and sintered at 200/250°C for 30/60 minutes. A test sample to a thickness of 13mm is processed by stacking a few layers of printed Ag-sinter and sintered at 200°C for 1h. Interestingly, good necking is observed in between the silver powder particles and measured properties for three different porosity levels of pressure-less Ag-sinter are as follows: • Discontinuous porosities of structure are about 15 to 20%, 25 to 35% and 45 to 55% depending on the paste chemistry and formulation (with or without binder) *Density of these pores structure is fro 4.5 to 7.7 g/cc • Electrical sheet resistivity is from 3.7 to 9.2 µΩ.cm • Thermal conductivity is from 80 to 190 W/m°K • Elastic modulus (ultrasonic testing method) is from 7.2 to 38 GPa 1. Lower the porostiy, hight the thermal conductivity and elastic modulus • Coefficient of thermal expansion (CTE) is about 19.2 to 21.5ppm • Specific heat capacity (Cp) is about 0.24-0.25 J/Kg°K *Both CTE and Cp properties of Ag-sinter are not influenced by porosity in the structure

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Section: IIIsupporting

confidence: 85%

Section: Porosity Of Pressure-less Ag-sintermentioning

confidence: 99%