scholarly journals Mechanical Properties of U-Cu Intermetallic Compound Measured by Nanoindentation

Materials ◽  
2018 ◽  
Vol 11 (11) ◽  
pp. 2215 ◽  
Author(s):  
Ruiwen Li ◽  
Chuan Mo ◽  
Yichuan Liao
Keyword(s):  
Mechanical Properties ◽  
Intermetallic Compound ◽  
Chemical Properties ◽  
Element Distribution ◽  
Treatment Temperature ◽  
Diffusion Method ◽  
Vacuum Furnace ◽  
Young’S Moduli ◽  
Pressure Diffusion ◽  
Physico Chemical

The physico-chemical properties of the Uranium intermetallic compound are of technological importance for improvement of the safety and compatibility of nuclear engineering systems. Diffusion couple samples with U and Cu were assembled and U-Cu intermetallic compounds were fabricated at interface by hot pressure diffusion method at a treatment temperature of 350 °C to 650 °C and at a pressure of 168 MPa in a vacuum furnace. The microstructure and element distribution of the compound phase have been studied by means of SEM, EDS, and XRD. The result showed that a new phase was developed to a thickness of approximately 10 μm with a ration of U:Cu with 1:5. Mechanical properties such as elastic moduli and hardness of the compound have been studied by means of nanoindentation. The nanoindentation testing on sample indicated that hardness of Uranium intermetallic compound are higher than that of metal U and Cu. Uranium intermetallic compound and U have a Young’s moduli with 121 GPa, 160 GPa respectively. The elastic/plastic responses of U-Cu intermetallic compound and U under nanoindentation tests were also discussed in detail.

Strain Energy and Behaviour of Overconsolidated Soils

1967 ◽  
Vol 4 (3) ◽  
pp. 326-333 ◽  
Author(s):  
Elmer W Brooker
Keyword(s):  
Mechanical Properties ◽  
Strain Energy ◽  
Large Scale ◽  
Chemical Properties ◽  
Earth Pressure ◽  
Quantitative Evidence ◽  
Physico Chemical ◽  
Overconsolidated Clays ◽  
Overconsolidated Soils

Bjerrum recently presented a strain energy hypothesis which explains qualitatively the behaviour of overconsolidated clays and the phenomena of long-term slope failures in these soils. Quantitative evidence, gathered from a series of large-scale consolidation tests, is presented here which supports the strain energy hypothesis. The coefficient of earth pressure at rest was found to be a function of strain energy at a given value of OCR. It is also shown that the degree of disintegration of overconsolidated soils during a slaking test is related to strain energy. It is inferred from the results that mineralogy and the capacity of a soil to adsorb strain energy are related. The evidence suggests that certain physico-chemical properties may be quantitatively related to mechanical properties through the concept of strain energy.

scholarly journals Evolution of an alumina-magnesia/self-forming spinel castable. Part II: physico-chemical and mechanical properties

Cerâmica ◽  
1999 ◽  
Vol 45 (295) ◽  
pp. 146-149
Author(s):  
D. Gutiérrez-Campos ◽  
J. I. Diaz ◽  
R. M. Rodriguez
Keyword(s):  
Mechanical Properties ◽  
Bulk Density ◽  
Chemical Properties ◽  
Microstructural Characteristics ◽  
Crushing Strength ◽  
Physico Chemical ◽  
Cold Crushing Strength

This study was carried out in conjunction with the investigation, reported in Part I, on the microstructural characteristics of an alumina-spinel castable with several percentages of MgO content. Bulk density and cold crushing strength of samples were evaluated dried and at three fired states (1000, 1200, 1400 °C). Results indicate little influence of MgO additions on physico-chemical properties of the alumina-magnesia/self-forming spinel castable. Characteristics compared with those reported for conventional alumina-spinel castables did not show large difference in values. Therefore, the alumina-magnesia/self-forming spinel castable could be a possible material for substitution of the conventional alumina-spinel castable.

scholarly journals Investigations on physico-chemical properties of TSPCU nonwoven for application as prosthetic venous valve

2021 ◽  
Vol 7 (2) ◽  
pp. 613-616
Author(s):  
Julia Schubert ◽  
Daniela Arbeiter ◽  
Andreas Götz ◽  
Kerstin Lebahn ◽  
Wolfram Schmidt ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Chemical Properties ◽  
Storage Conditions ◽  
Valve Leaflet ◽  
Venous Valve ◽  
Sem Images ◽  
Venous Valves ◽  
Prosthetic Valves ◽  
Physico Chemical ◽  
3D Printed

Abstract Electrospinning is used for producing nonwovens for medical polymer-based implants, such as prosthetic valves or covered scaffolds. In this study, nonwovens for prosthetic venous valves are investigated regarding their morphology and mechanics in physiological medium. Spinning molds were developed based on previous venous valve leaflet designs, 3D printed in different sizes and covered with electrospun nonwovens. Samples were stored in a physiological 0.9% saline at 37°C to investigate the influence of fiber rearrangement and swelling in medium for several weeks. Two different nonwovens of thermoplastic silicone-based polycarbonaturethane (TSPCU) were compared. Tensile test results show that storage in medium has a relevant influence on the mechanical properties. SEM images of TSPCU show substantially increased fiber diameters after 8 days stored in medium. After detaching the valve leaflet nonwovens from the molds, shrinkage of the material of approximately 12% was detected. A suitable valve size could be identified for joining with the stent structure into an interventional prosthetic venous valve. The results demonstrate the influence of storage conditions on the morphological and mechanical properties of electrospun TSPCU nonwovens. For development and dimensioning of venous valve leaflets, this change in mechanical behavior and possible shrinkage of the material has to be considered.

scholarly journals Comparison of Microstructure and Mechanical Properties of Induction and Vacuume Brazed Joint of Titanium Via Copper and Ag-Cu Eutectic Filler Metal / Mikrostruktura I Właściwości Mechaniczne Połączeń Tytanu Lutowanych Indukcyjnie I Próżniowo Z Użyciem Spoiwa Miedzianego I Eutektycznego Ag-Cu

2015 ◽  
Vol 60 (4) ◽  
pp. 2593-2598 ◽  
Author(s):  
M. Różański ◽  
D. Majewski ◽  
K. Krasnowski
Keyword(s):  
Mechanical Properties ◽  
Filler Metal ◽  
Chemical Properties ◽  
Metallographic Examination ◽  
Air Atmosphere ◽  
Microstructure And Mechanical Properties ◽  
Physico Chemical ◽  
Brazed Joints ◽  
Brazed Joint

This study presents the basic physico-chemical properties and describes the brazeability of titanium. The work contains the results of macro and microscopic metallographic examination as well as the results of strength-related tests of vacuum and induction brazed joints made of Grade 2 technical titanium using the Cu 0.99 and Ag 272 filler metal interlayers and F60T flux intended for titanium brazing in the air atmosphere.

Investigation of Physico-Chemical Properties and Microstructure of HA/316L Asymmetrical Functionally Gradient Biomaterial

2011 ◽  
Vol 239-242 ◽  
pp. 1062-1067 ◽  
Author(s):  
Jian Peng Zou
Keyword(s):  
Mechanical Properties ◽  
Hot Pressing ◽  
Phase Interface ◽  
Chemical Properties ◽  
Fracture Modes ◽  
Gradient Layer ◽  
Functionally Gradient ◽  
Physico Chemical ◽  
Two Phases

By using of hot pressing(HP) technique, HA/316L powder asymmetrical functionally gradient biomaterial (FGM) with 316L’s content changing as 100vol%→80vol%→60vol%→40vol%→20vol%→0vol% was prepared successfully. The results show obvious macroscopic gradient changes in the FGM. While the components change continuously in microcosmic, the interfaces among all gradient layers integrate tightly. The addition of 316L powder changes the fracture modes of the composites and improves their mechanical properties. HA contents in HA/316L biological FGM change regularly with different gradient layer, which is responding to the components design. Combining circumstance of phase interface is considerably well and both phase bite into each other at the interface. The two phases of HA and 316L powder dissolve into each other in some degree during hot pressing and the combining mechanism is dissolving behavior.

scholarly journals Removal Properties of Anionic Dye Eosin by Cetyltrimethylammonium Organo-Clays: The Effect of Counter-Ions and Regeneration Studies

Molecules ◽  
2018 ◽  
Vol 23 (9) ◽  
pp. 2364 ◽  
Author(s):  
Fethi Kooli ◽  
Yan Liu ◽  
Mostafa Abboudi ◽  
Souad Rakass ◽  
Hicham Hassani ◽  
...  
Keyword(s):  
Chemical Properties ◽  
Treatment Temperature ◽  
Basal Spacing ◽  
X Ray Diffraction ◽  
Counter Ions ◽  
Physico Chemical ◽  
Bromide Solution ◽  
Endothermic Process ◽  
Thermal Stability Of

The organo-clays (OCs) were prepared by a cation exchange reaction between surfactant (cetyltrimethylammonium, C16TMA) from different counterions (Bromide, Chloride, and Hydroxide). The effect of the counterions was investigated on the physico-chemical properties of the prepared organo-clays. The highest uptake of organic cations (1.60 mmol/g) was achieved using cetyl trimethylammonium bromide solution and the lowest value (0.93 mmol/g) was obtained after modification with cetyl trimethylammonium hydroxide solution starting from the same initial ratio of mmol/g of clay greater than 2.40. The arrangement of C16TMA cations within the interlayer space was assumed to be perpendicular with a tilt angle of 32° to the plane of clay sheets instead of being parallel to the clay surface using C16TMAOH solution at the same ratio. Different techniques were used to characterize these materials. The thermal stability of these organ-clays was investigated using an in-situ X-ray diffraction (XRD) technique. The decomposition of the surfactant moiety occurred at temperatures higher than 215 °C and was accompanied with a shrinkage of the basal spacing value to 1.42 nm. These materials were applied in the removal of an acid dye “eosin.” The removed amount of eosin depended on the initial concentrations and the content of surfactants in the organo-clays. The removal of eosin was found to be an endothermic process. The maximum amount of 90 mg/g was achieved. The preheated treatment temperature of two selected OCs did affect the removal properties of eosin. A progressive reduction was observed at temperatures higher than 200 °C. The regeneration of spent OCs was studied and acceptable removal efficiency was maintained after 4 to 6 cycles depending on the used initial concentrations.

Physical and Chemical Properties of Adhesives Based on Geocement for Restoration and Rehabilitation of Building Materials

2013 ◽  
Vol 688 ◽  
pp. 123-129 ◽  
Author(s):  
Grigorii Vozniuk ◽  
Еlena Kаvalerova ◽  
Pavel Vasiljevich Krivenko ◽  
Оleg Petropavlovsky
Keyword(s):  
Mechanical Properties ◽  
Bond Strength ◽  
Building Materials ◽  
Chemical Properties ◽  
Physical And Chemical Properties ◽  
Physico Chemical ◽  
User Friendly ◽  
Physical And Chemical ◽  
And Chemical Properties

This paper covers the results of study of physico-chemical and mechanical properties of the adhesives based on geocements which have a number of advantageous properties, among them: high compressive and bond strength in the conditions of long-term exposure of various factors, excellent durability, etc. These adhesives are environmentally and user-friendly and safety, their cost is compatible to the known-in-the-art analogs. The results of study suggested to draw a conclusion that they could be successfully used for rehabilitation and restoration of the building materials such as concrete, ceramics, natural stone.

scholarly journals Effect of complex flame retardant on physico-chemical properties of orthophthalic unsaturated resin

2020 ◽  
pp. 26-29
Author(s):  
Y. M. Yevtushenko ◽  
Y. A. Grigoriev ◽  
I. O. Kuchkina ◽  
E. V. Afoshina ◽  
G. A. Krushevsky
Keyword(s):  
Mechanical Properties ◽  
Composite Material ◽  
Composite Materials ◽  
Flame Retardant ◽  
Unsaturated Polyester ◽  
Chemical Properties ◽  
Physical And Mechanical Properties ◽  
Polyester Resins ◽  
Physico Chemical ◽  
Kinetics Of

A brief review of the results of studies on reducing the combustibility of composite materials based on unsaturated polyester resins is presented. A flame retardant orthophthalic unsaturated resin based on a complex flame retardant was developed and studied. It is shown that the category for resistance to burning of the resin is achieved with 15–20% filling of the complex flame retardant based on ammonium polyphosphate, melamine and pentaerythritol. The kinetics of curing and physical and mechanical properties of the composite material are evaluated.

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