Micromechanical Properties of Silicate Glass Films on Sapphire Substrates

1997 ◽  
Vol 505 ◽  
Author(s):  
Andrey V. Zagrebelny ◽  
C. Barry Carter
Keyword(s):  
Mechanical Properties ◽  
Silicate Glass ◽  
Thin Layers ◽  
Depth Sensing ◽  
Crystalline Materials ◽  
Sapphire Substrates ◽  
Nanomechanical Testing ◽  
Force Displacement ◽  
Glass Films

ABSTRACTThe deformation of thin layers of glass on crystalline materials has been examined using newly developed experimental methods for nanomechanical testing. Continuous films of anorthite (CaAl2Si2O8), celsian (BaAl2Si2O8), and monticellite (CaMgSiO4) were deposited onto A12O3 surfaces by pulsed-laser deposition (PLD). Mechanical properties such as Young's modulus and hardness were probed with a high-resolution depth-sensing indentation instrument. Nanomechanical testing, combined with AFM in-situ imaging of the deformed regions, allowed force-displacement measurements and imaging of the same regions of the specimen before and immediately after indentation. Emphasis has been placed on examining how changes in the glass composition, residual stress introduced into the films, effect of film's heat-treatment, and the effect of substrate crystallographic orientation will affect the mechanical properties of silicate-glass films.

Effect of Glass Composition on Mechanical Properties of Interfaces Between Alumina and Silicate Glass

1996 ◽  
Vol 458 ◽  
Author(s):  
Andrey V. Zagrebelny ◽  
Erica T. Lilleodden ◽  
C. Barry Carter
Keyword(s):  
Mechanical Properties ◽  
Single Crystal ◽  
Silicate Glass ◽  
Glass Composition ◽  
Depth Sensing ◽  
Force Microscopy ◽  
Atomic Force ◽  
Afm Imaging ◽  
Force Displacement

ABSTRACTInterfaces between glass and crystalline grains have been examined using a thin-film geometry which allows the use of newly developed experimental methods for micromechanical testing of interfaces. In this approach, continuous films of thicknesses ranging 100–200 nm of anorthite (CaAl2Si2O8), celsian (BaAl2Si2O8), and monticellite (CaMgSiO4) are deposited onto single-crystal Al2O3 (α-structure) surfaces of different crystallographic orientations by pulsed-laser deposition (PLD).Mechanical properties such as hardness, stiffness, and reduced Young's modulus were probed with a newly developed high-resolution depth-sensing indentation instrument. Emphasis has been placed on examining how changes in the glass composition will affect the mechanical properties of the single-crystal Al2O3/silicate-glass interfaces. The indentation data obtained from these experiments correlate directly to the morphology of the deformed regions imaged with atomic force microscopy (AFM). Nanomechanical tests combined with AFM imaging of the deformed regions allow force-displacement measurements and in-situ imaging of the same regions of the specimen before and immediately after indentation. This new technique eliminates the uncertainty of locating the indenter after unloading.

Surface Morphology of Mechanically Strained Silicate Glass Films on Alumina Substrates

1997 ◽  
Vol 3 (S2) ◽  
pp. 1281-1282
Author(s):  
A.V. Zagrebelny ◽  
C.B. Carter
Keyword(s):  
Thin Films ◽  
Mechanical Properties ◽  
Integrated Circuits ◽  
Surface Morphology ◽  
Silicate Glass ◽  
Thermal Stresses ◽  
Thin Layers ◽  
Common Mechanism ◽  
The Matrix ◽  
Glass Films

It has been long recognized that the understanding of mechanical properties of thin films on substrates requires an understanding of the stresses in the film structures as well as a knowledge of mechanisms by which thin films deform. It has also been shown that these stresses may compromise the performance of integrated circuits, magnetic media, etc. The presence of residual and thermal stresses between the matrix and intergranular films in structural multiphase ceramics is the most common mechanism of failure that often causes deformation and fractureIn this paper, the effect of residual stress on mechanical properties of silicate-glass films on single-crystal α-Al2O3 substrates has been studied with AFM with the emphasis on the changes in surface morphology associated with the film strain and relaxation. The deformation of thin layers of glass on crystalline materials has also been examined using newly developed experimental methods for nanomechanical testing.

In-Situ TEM Crystallization of Silicate-Glass Films on Al2O3

1998 ◽  
Vol 46 (1) ◽  
pp. 283-303 ◽  
Author(s):  
M.P. Mallamaci ◽  
J. Bentley ◽  
C.B. Carter
Keyword(s):  
Silicate Glass ◽  
In Situ Tem ◽  
Glass Films

A method of monitoring water absorption in polymers using a depth sensing indentation system

1996 ◽  
Vol 11 (2) ◽  
pp. 529-536 ◽  
Author(s):  
I. A. Ashcroft ◽  
G. M. Spinks
Keyword(s):  
Mechanical Properties ◽  
Elastic Modulus ◽  
Water Absorption ◽  
Creep Strain ◽  
Epoxy Adhesive ◽  
Depth Sensing ◽  
Surface Layers ◽  
Depth Profiles ◽  
Hardness Depth

The mechanical properties of many polymers are known to change as they absorb water. This fact has been used to monitor the absorption of water into the surface layers of an epoxy adhesive with a depth sensing indentation system. Two methods have been demonstrated. The sample can be immersed in water for a period of time and then removed and tested in air. Alternatively, the sample can be tested in in situ. In the second method the transport of water through the adhesive can clearly be seen in hardness/depth profiles. Hardness, elastic modulus, and creep strain of the adhesive change with time until a stable value is reached, which corresponds to full plasticization of the adhesive to the influence depth of the indenter. The initial mechanical properties of the epoxy are mostly recovered on drying.

Mechanical properties of nanoporous organo silicate glass films for the use in integrated circuits interconnects

2020 ◽  
Author(s):  
Ivan Ovchinnikov ◽  
Georgiy Orlov ◽  
Dmitriy Seregin ◽  
Alexey Vishnevskiy ◽  
Konstantin Vorotilov ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Integrated Circuits ◽  
Silicate Glass ◽  
Glass Films

scholarly journals The Impact of Hydrogen on Mechanical Properties; A New In Situ Nanoindentation Testing Method

Micromachines ◽  
2019 ◽  
Vol 10 (2) ◽  
pp. 114 ◽  
Author(s):  
Christian Müller ◽  
Mohammad Zamanzade ◽  
Christian Motz
Keyword(s):  
Mechanical Properties ◽  
Activation Energy ◽  
Elastic Modulus ◽  
Dislocation Nucleation ◽  
Coarse Grained ◽  
Testing Method ◽  
Nanomechanical Testing ◽  
Nanoindentation Testing ◽  
The Impact

We have designed a new method for electrochemical hydrogen charging which allows us to charge very thin coarse-grained specimens from the bottom and perform nanomechanical testing on the top. As the average grain diameter is larger than the thickness of the sample, this setup allows us to efficiently evaluate the mechanical properties of multiple single crystals with similar electrochemical conditions. Another important advantage is that the top surface is not affected by corrosion by the electrolyte. The nanoindentation results show that hydrogen reduces the activation energy for homogenous dislocation nucleation by approximately 15–20% in a (001) grain. The elastic modulus also was observed to be reduced by the same amount. The hardness increased by approximately 4%, as determined by load-displacement curves and residual imprint analysis.

Development of Innovative Algorithm for Nanomechanics and its Applications to the Characterization of Materials

2012 ◽  
Vol 528 ◽  
pp. 165-196
Author(s):  
Yeau Ren Jeng
Keyword(s):  
Mechanical Properties ◽  
Experimental Testing ◽  
Material Strength ◽  
Depth Sensing ◽  
Dislocation Mechanism ◽  
Hybrid Approaches ◽  
Atomistic Calculations ◽  
Nanoscale Interfaces ◽  
Characterization Of Materials

Understanding major mechanisms affecting material strength such as grain size, grain orientation and dislocation mechanism from atomistic viewpoint can empower scientists and engineers with the capability to produce vastly strengthened materials. Computational studies can offer the possibility of carrying out simulations of material properties at both larger length scales and longer times than direct atomistic calculations. The study has conducted theoretical modeling and experimental testing to investigate nanoscale mechanisms related to material strength and interfacial performance. Various computational algorithms in nanomechanics including energy minimization, molecular dynamics and hybrid approaches that mix atomistic and continuum methods to bridge the length and time scales have been used to thoroughly study the deformation and strengthening mechanisms. Our study has also performed experiments including depth-sensing indentation technique andin-situpico-indentation to characterize the nanomechanisms related to material strength and tribological performance. In this project, we have developed the innovative mutil-scale algorithms in the area of nanomechanics. These approaches were used to studies the defect effect on the mechanical properties of thin film, mechanical properties of nanotubes, and tribological phenomena at nanoscale interfaces.

Hetero-Epitaxy of Group Va Metals on Sapphire

1972 ◽  
Vol 30 ◽  
pp. 492-493
Author(s):  
J. E. O'Neal ◽  
J. J. Bellina ◽  
B. B. Rath
Keyword(s):  
Thermal Contact ◽  
High Vacuum ◽  
Electron Beam Evaporation ◽  
Ultra High Vacuum ◽  
Backing Plate ◽  
Sapphire Substrates ◽  
Deposition Parameters ◽  
Polishing Damage ◽  
Reflection Electron Diffraction

Thin films of the bcc metals vanadium, niobium and tantalum were epitaxially grown on (0001) and sapphire substrates. Prior to deposition, the mechanical polishing damage on the substrates was removed by an in-situ etch. The metal films were deposited by electron-beam evaporation in ultra-high vacuum. The substrates were heated by thermal contact with an electron-bombarded backing plate. The deposition parameters are summarized in Table 1.The films were replicated and examined by electron microscopy and their crystallographic orientation and texture were determined by reflection electron diffraction. Verneuil-grown and Czochralskigrown sapphire substrates of both orientations were employed for each evaporation. The orientation of the metal deposit was not affected by either increasing the density of sub-grain boundaries by about a factor of ten or decreasing the deposition rate by a factor of two. The results on growth epitaxy are summarized in Tables 2 and 3.

Dynamics of Nanoparticle Chain Aggregates of Carbon Under Tension

2003 ◽  
Vol 778 ◽  
Author(s):  
Rajdip Bandyopadhyaya ◽  
Weizhi Rong ◽  
Yong J. Suh ◽  
Sheldon K. Friedlander
Keyword(s):  
Mechanical Properties ◽  
Carbon Black ◽  
Polymer Film ◽  
Elastic Behavior ◽  
Small Strains ◽  
Transmission Electron ◽  
Chain Aggregates ◽  
Nanoparticle Chains ◽  
Reinforcing Filler

AbstractCarbon black in the form of nanoparticle chains is used as a reinforcing filler in elastomers. However, the dynamics of the filler particles under tension and their role in the improvement of the mechanical properties of rubber are not well understood. We have studied experimentally the dynamics of isolated nanoparticle chain aggregates (NCAs) of carbon made by laser ablation, and also that of carbon black embedded in a polymer film. In situ studies of stretching and contraction of such chains in the transmission electron microscope (TEM) were conducted under different maximum values of strain. Stretching causes initially folded NCA to reorganize into a straight, taut configuration. Further stretching leads to either plastic deformation and breakage (at 37.4% strain) or to a partial elastic behavior of the chain at small strains (e.g. 2.3% strain). For all cases the chains were very flexible under tension. Similar reorientation and stretching was observed for carbon black chains embedded in a polymer film. Such flexible and elastic nature of NCAs point towards a possible mechanism of reinforcement of rubber by carbon black fillers.

Effect of TiB2 particle addition on the mechanical properties of Al/TiB2 in situ formed metal matrix composites

2018 ◽  
Vol 60 (12) ◽  
pp. 1221-1224 ◽  
Author(s):  
Balachandran Gobalakrishnan ◽  
P. Ramadoss Lakshminarayanan ◽  
Raju Varahamoorthi
Keyword(s):  
Mechanical Properties ◽  
Metal Matrix Composites ◽  
Metal Matrix ◽  
Tib2 Particle ◽  
Matrix Composites ◽  
Particle Addition
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