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Creep Behaviors of Low-temperature Sintered Nanoscale Silver Paste at Elevated Temperatures

Author: NiePeng
Tutor: ChenGang；XuLi
School: Tianjin University
Course: Chemical Process Equipment
Keywords: Nano-silver paste Creep Creep rupture life Damage evolution
CLC: TG42
Type: Master's thesis
Year: 2010
Downloads: 97
Quote: 0
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Abstract


In this paper, a new type of thermal interface material temperature creep behavior of low temperature sintered nano - silver paste film . Nano silver paste film on sintering theory and nanoparticles characteristics at low temperature sintering of the silver film has a certain porosity and has excellent electric properties . Creep test temperature range from 100 ℃ to 175 ° C , and the stress 2MPa to 7.5MPa , the results showed that: the low temperature sintered nano - silver paste films have a certain degree of creep resistance in the test range , the creep process , steady-state creep stage occupied most of the time , the steady-state creep rate of approximately 10 -6 1 0 -8 s -1 . The power-law creep equation within the range of the test can be used to describe the creep process changes with temperature and stress . Using a variety of methods to predict the creep rupture life film of nano - silver paste , studies have shown that : empirical formula to predict the creep rupture life unfit ; Monkman-Grant relationship can be more accurate forecasts , but its scope of application of the requirement that materials must satisfy the power-law creep constitutive relations ; Larson -Miller parameter method using the approximation method , the material is obvious Larson-Miller parameter variation and its parameters finishing methods to make the analysis . theta function method a good description of the creep process of nano- silver paste films and more accurate steady-state creep rate can be obtained by this method . Evolution studies have shown that damage to the film of low temperature sintered nano - silver paste , the material creep acceleration phase will enter its life 0.6 to 0.8 times . Respectively using Robtonov damage evolution theory and power dissipation model the evolution of its damage analysis , the analysis of the results of the two similar , but Robtonov damage evolution theory analysis results tend to be conservative .

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Welding, metal cutting and metal bonding > Welding materials
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