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  1. 3 Acta Physica Polonica A

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  1. 1 2017

  2. 1 2016

  3. 1 2015

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  1. 3 Telli M.

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Soda Lime Silicate Glass-Copper Metal Joining by Controlled Heat Treatments in Air

100%
Telli M.
Acta Physica Polonica A
|
2016
|
vol. 129
|
issue 4
482-484
EN
Metal-glass joints are needed to improve efficiencies of heat collecting units used in linear parabolic sun collector systems. Soda lime silicate glass-copper metal joints were prepared at 800°C for 5, 10 and 20 min by furnace treatment in air. Cu is rapidly oxidized with heat treatment in air, reacted with glass and formed some bubbles at reaction interface. Scanning electron microscope investigation suggested copper oxide formation at copper interface, reaction between copper oxide and glass and formation of bubbles at joining interface and some microcracking for the studied glass disk on Cu disk sample profiles. ANSYS14 software simulations suggested joined glass experienced complicated and high residual stress levels due to big thermal expansion coefficient difference and bubble formation at the joining interface. The residual minimal principal stress levels were at the order of -400 MPa for joined glass at interface produced microcracking in glass starting from joined interface growing into glass layer.
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Joining of Soda Lime Silicate Glass TO TI6AL4V Alloy in Air by Controlled Heat Treatments

100%
Telli M.
Acta Physica Polonica A
|
2015
|
vol. 127
|
issue 4
972-975
EN
Soda lime silicate glass was joined to Ti6Al4V alloy in air by heat treatment at 800°C for 10, 20 and 30 min and by subsequent cooling to room temperature with a controlled cooling rate. Stresses, due to thermal expansion mismatch, have developed at glass-metal interface after high temperature joining and cooling down to room temperature. The finite element calculations, performed using ANSYS 14 software, suggested that the glass-metal interface was experiencing rather low maximal and minimal principal stresses due to joining. Highest maximal principal stress level was about 25 MPa and lowest minimal principal stress level was about -40 MPa for used sandwich sample profiles. Heat treatment duration affected tensile bonding strength and interfacial reaction between the glass and the Ti alloy. Scanning electron microscope analysis of glass-alloy joining interface showed that a secondary K, Ca, Ti rich sodium silicate phase was forming in glass, starting at glass alloy interface and that it was growing with the increase in heat treatment duration. Low joining stress levels at the glass-alloy interface for used sandwich sample profile and good bonding between the soda lime silicate glass and Ti6Al4V alloy resulted in creation of successful soda lime silicate glass-Ti6Al4V joints.
3
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Soda Lime Silicate Glass-to-Titanium Joining by Controlled Heat Treatments in Air

100%
Telli M.
Acta Physica Polonica A
|
2017
|
vol. 131
|
issue 3
414-416
EN
Glass-to-metal joining is important for improving efficiencies of heat collecting units, employed in parabolic solar collecting systems. In this study, soda lime silicate glass was joined to titanium in air at 700, 800 and 900°C for 5 min by controlled heat treatments. Glass-to-titanium bonding was good and no delamination or macro cracking in glass was observed. During heat treatment, titanium is oxidized in air prior to the reaction with glass. The reaction between oxidized titanium and glass results in bubble formation at joining interface. Bubble formation was found to be decreased with decreasing joining temperature. Thermal stresses developed at glass-titanium junction were modeled by employing ANSYS 14 multiphysics simulation software. For the studied sample profile, soda lime silicate glass, close to the joining interface, experienced rather low residual stresses of the order of 10 MPa maximum and -40 MPa minimum principal stress levels. Good glass-to-titanium bonding and low thermal residual stress are mainly due to similar thermal expansion coefficients of these materials, which was found to be important for achieving successful joining in air.
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