Alucone Interlayers to Minimize Stress Caused by Thermal Expansion Mismatch between Al2O3 Films and Teflon Substrates

2013 ◽  
Vol 5 (3) ◽  
pp. 1165-1173 ◽  
Author(s):  
Shih-Hui Jen ◽  
Steven M. George ◽  
Robert S. McLean ◽  
Peter F. Carcia
Keyword(s):  
Thermal Expansion ◽  
Thermal Expansion Mismatch ◽  
Al2o3 Films

Microstructural and Microchemical Characterization of Nickel Sulfide Inclusions in Plate Glass

1991 ◽  
Vol 49 ◽  
pp. 962-963
Author(s):  
J. Cooper ◽  
O. Popoola ◽  
W. M. Kriven
Keyword(s):  
Thermal Expansion ◽  
Phase Transformation ◽  
Glass Matrix ◽  
Nickel Sulfide ◽  
Plate Glass ◽  
Thermal Expansion Mismatch ◽  
Volume Increase ◽  
Β Phase ◽  
Microchemical Characterization

Nickel sulfide inclusions have been implicated in the spontaneous fracture of large windows of tempered plate glass. Two alternative explanations for the fracture-initiating behaviour of these inclusions have been proposed: (1) the volume increase which accompanies the α to β phase transformation in stoichiometric NiS, and (2) the thermal expansion mismatch between the nickel sulfide phases and the glass matrix. The microstructure and microchemistry of the small inclusions (80 to 250 μm spheres), needed to determine the cause of fracture, have not been well characterized hitherto. The aim of this communication is to report a detailed TEM and EDS study of the inclusions.

scholarly journals Unravelling thermal stress due to thermal expansion mismatch in metal–organic frameworks for methane storage

2021 ◽  
Author(s):  
Jelle Wieme ◽  
Veronique Van Speybroeck
Keyword(s):  
Thermal Expansion ◽  
Thermal Stress ◽  
Pressure Coefficient ◽  
Metal Organic Frameworks ◽  
Methane Storage ◽  
Thermal Expansion Mismatch ◽  
Thermal Pressure ◽  
Temperature Changes ◽  
Metal Organic ◽  
The Impact

Thermal stress is present in metal–organic frameworks undergoing temperature changes during adsorption and desorption. We computed the thermal pressure coefficient as a proxy for this phenomenon and discuss the impact of thermal expansion mismatch.

Shape forming by thermal expansion mismatch and shape memory locking in polymer/elastomer laminates

2017 ◽  
Vol 26 (10) ◽  
pp. 105027 ◽  
Author(s):  
Chao Yuan ◽  
Zhen Ding ◽  
T J Wang ◽  
Martin L Dunn ◽  
H Jerry Qi
Keyword(s):  
Thermal Expansion ◽  
Shape Memory ◽  
Thermal Expansion Mismatch

Rapid shear alignment of sub-10 nm cylinder-forming block copolymer films based on thermal expansion mismatch

Nano Futures ◽  
2018 ◽  
Vol 1 (3) ◽  
pp. 035006
Author(s):  
Samuel M Nicaise ◽  
Karim R Gadelrab ◽  
Amir Tavakkoli K G ◽  
Caroline A Ross ◽  
Alfredo Alexander-Katz ◽  
...  
Keyword(s):  
Thermal Expansion ◽  
Block Copolymer ◽  
Thermal Expansion Mismatch ◽  
Shear Alignment ◽  
Copolymer Films

Pressureless Co-Sintering of Al2O/ZrO2 Multilayers and Bilayers

1996 ◽  
Vol 434 ◽  
Author(s):  
Peter Z. Cai ◽  
David J. Green ◽  
Gary L. Messing
Keyword(s):  
Thermal Expansion ◽  
Cyclic Loading ◽  
Microscopic Observation ◽  
Surface Defects ◽  
Tape Casting ◽  
Thermal Expansion Mismatch ◽  
Heating Rates ◽  
The Difference ◽  
Extent Of Damage ◽  
Transverse Damage

AbstractVarious types of damage were observed in pressureless-sintered Al2O3/ZrO2 symmetric laminates (multilayers) and asymmetric laminates (bilayers) fabricated by tape casting and lamination. These defects included channel defects in ZrO2-containing layers, Al2O3 surface defects parallel to the layers, decohesion between the layers, and transverse damage within the Al2O3 layer in the bilayers. Detailed microscopic observation attributed the defects to a combined effect of mismatch in both sintering rate and thermal expansion coefficient between the layers. Crack-like defects were formed in the early stages of densification, and these defects acted as pre-existing flaws for thermal expansion mismatch cracks. Curling of the bilayers during sintering was monitored and the measured rate of curvature change, along with the layer viscosities obtained by cyclic loading dilatometry, was used to estimate the sintering mismatch stresses. The extent of damage could be reduced or even eliminated by decreasing the difference in layer sintering rate. This was accomplished by reducing the heating rates or by adding Al2O3 in the ZrO2 layers.

A Generalized Model for Residual Stress Caused by Thermal Mismatch in Multilayer Structures

2011 ◽  
Vol 704-705 ◽  
pp. 1284-1290
Author(s):  
Yu Mei Bai ◽  
Ying Qiang Xu ◽  
Tao Zhang
Keyword(s):  
Residual Stress ◽  
Thermal Expansion ◽  
Temperature Variation ◽  
Analytical Model ◽  
Layer Structure ◽  
Engineering Application ◽  
Effect Of Temperature ◽  
Multilayer Structures ◽  
Coating System ◽  
Thermal Expansion Mismatch

An analytical model based on multilayer structure with thermal expansion mismatch caused by temperature gradients was established to predict the residual stress in the system. The solution obtained from the model is independent of the number of layers. Three simplified models: bi-layer structure, coating system and film system with great compatibility are developed considering different engineering application. And the bilayer structure is verified by Stoney’s equation under the same conditions. Tri-layer coating system ZrO2/ Al2O3/1Cr18Ni9Ti is established in order to research the effect of temperature variations on the residual stress between different layers. The results suggested the stress has obvious mutation in coating interface with different temperature variation. And the residual stress with different temperature variation in different layers is larger than that with identical temperature variation. Key words: multilayer structures; residual stress; analytical model; thermal expansion mismatch; temperature variation

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