Effect of Fiber Concentration on Mechanical and Thermal Properties of a Solder Matrix Fiber Composite Thermal Interface Material
Journal article, 2019

Increased demand on the mechanical and thermal properties on the thermal interface and die attach material creates a demand for materials with tailored material properties. Solder matrix fiber composites (SMFCs) have been shown to address these challenges, but have, so far, required complicated procedures and components. In this paper, we present the fabrication of a new type of SMFC based on commercially available fiber networks infiltrated with Sn-Ag-Cu alloy (SAC305) or indium using equipment for large-volume production. The composite material exhibits similar thermal properties compared to pure solder, and mechanical properties that can be tailored toward specific applications. We also show that the handling properties of the SMFC allows it to be used in process flows where multiple reflow cycles are required and can achieve a well-defined bond line thickness (BLT) and good bonding using fluxless reflow under pressure.

thermal management

Bond line thickness (BLT) control

thermal interface materials (TIMs)


die attach


Josef Hansson

Chalmers, Microtechnology and Nanoscience (MC2), Electronics Material and Systems

Torbjörn Nilsson

Chalmers, Microtechnology and Nanoscience (MC2), Electronics Material and Systems

L. Ye

SHT Smart High-Tech

Johan Liu

Chalmers, Microtechnology and Nanoscience (MC2), Electronics Material and Systems

IEEE Transactions on Components, Packaging and Manufacturing Technology

2156-3950 (ISSN) 21563985 (eISSN)

Vol. 9 6 1045-1053 8701667

Nanotechnology Enhanced Sintered Steel Processing

Swedish Foundation for Strategic Research (SSF) (GMT14-0045), 2016-01-01 -- 2020-12-31.

Carbon Based High Speed 3D GaN Electronics System

Swedish Foundation for Strategic Research (SSF) (SE13-0061), 2014-03-01 -- 2019-06-30.

Pilot line production of functionalized CNTs as thermal interface material for heat dissipation in electronics applications (SMARTHERM)

European Commission (EC) (EC/H2020/690896), 2016-01-01 -- 2018-12-31.

Areas of Advance


Subject Categories

Polymer Technologies

Textile, Rubber and Polymeric Materials

Composite Science and Engineering



More information

Latest update