20 Result(s)
within
A. Passerone
Characterization and Evaluation of Materials
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Article
Wettability of SiC and graphite by Co–Ta alloys: evaluation of the reactivity supported by thermodynamic calculations
Within the context of the design of high-temperature brazing process for C and SiC-based composites, a basic study is presented here about the wetting and interfacial reactivity of Co–Ta alloys in contact with...
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Article
Critical Issues for Producing UHTC-Brazed Joints: Wetting and Reactivity
A brief survey is presented of the most important interaction phenomena occurring at the solid-liquid interfaces in metal-ceramic systems at high temperatures, with special attention to the most recent develop...
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Article
Joining of ZrB2 Ceramics to Ti6Al4V by Ni-Based Interlayers
Pure ZrB2 and ZrB2-SiC composites were joined to Ti6Al4V at 1100 °C using B-Ni50 (at.%) as a filler alloy. The brazing medium and the processing parameters were chosen on the basis of specific wetting tests which...
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Article
Isothermal solid–liquid transitions in the (Ni,B)/ZrB2 system as revealed by sessile drop experiments
In the framework of joining processes of ultrahigh temperature ceramics (UHTCs), sessile drop experiments were performed in the Ni–B/ZrB2 system in the range 1110° ≤ T ≤ 1200 °C. They show that, at temperatures b...
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Article
Control of Interfacial Reactivity Between ZrB2 and Ni-Based Brazing Alloys
Transition metals diborides (Ti,Zr,Hf)B2 play a key role in applications where stability at extremely high temperatures and damage tolerance are required; however, much research has still to be done to optimize t...
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Article
Diamond–metal interfaces in cutting tools: a review
This article reviews studies undertaken on diamond cutting tools, with particular regard to the characteristics and performance of diamond/metal interfaces. The affinity of carbon to metals, as well as the wet...
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Article
SiC/SiC and SiC/Kovar joining by Ni–Si and Mo interlayers
A composite joining technique, using a Ni–56Si filler alloy and Mo as interlayers, was used to join SiC to SiC and to Kovar. The wetting of the Ni–Si alloy on SiC ceramic was studied in a vacuum at 1,350 °C by...
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Article
Ab initio simulations of the Ag(111)/Al2O3 interface at intermediate oxygen partial pressures
The relative stability of different realizations of the Ag(111)/Alumina interfaces with varying oxygen partial pressures is investigated by means of ab initio density functional theory (DFT) simulations. Previ...
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Article
Wetting and interactions of Ni- and Co-based superalloys with different ceramic materials
In this work, a systematic study of the wetting behavior of two Ni-based and one Co-based superalloys, used, in particular, for the fabrication of turbine blades, is presented with reference to different ceram...
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Article
Wetting and interfacial behavior of Ni–Si alloy on different substrates
Wetting of molten Ni–56 at.% Si alloy on different substrates (SiC ceramic, Ni- and Co-based superalloys, Kovar, and Mo) are performed under different experimental conditions by the sessile drop technique. Tem...
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Article
Wetting of Group IV diborides by liquid metals
The possibility to exploit the peculiar characteristics of transition elements diboride ceramics—a class of promising materials for high temperature and highly aggressive applications—often depends to a great ...
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Article
Wetting and spreading of liquid metals on ZrB2-based ceramics
The possibility to exploit commercially the peculiar characteristics of refractory metallic and ceramic materials and in particular of Zirconium diboride ceramics—a class of promising materials for high temper...
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Article
Measurement of contact angle and work of adhesion at high temperature
A critical review is given of the present state of knowledge and future perspectives in high-temperature contact angle measurement. Experimental results obtained by the different versions of the sessile drop m...
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Chapter
Wettability of TiB2 Ceramics by Liquid Cu and Ag-Cu Eutectic Alloys
The behaviour of several types of TiB2-based ceramics in contact with liquid copper or silver-copper alloys has been evaluated. The wettability of these systems has been determined by the sessile drop method at v...
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Article
Oxygen mass transfer at liquid-metal-vapour interfaces under a low total pressure
The problem of oxygen exchange at the interface between a gas and a liquid metal is treated for systems under a “vacuum” (Knudsen regime, pressures lower than 1 Pa), where, due to the large mean free path of g...
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Article
Surface reactivity of liquid metal with oxygen and its relationship with surface tension measurements: a kinetic-fluodynamic model
A kinetic and fluodynamic description of processes that may take place near the liquid-vapour interface in the presence of an inert carrier flow containing definite oxygen amounts is presented, in relation to ...
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Article
Influence of oxygen contamination on the surface tension of liquid tin
The surface tension of liquid tin has been measured by the sessile-drop technique as a function of temperature, in the range 232 ⩽T (°C) ⩽ 800 and under different atmospheres. It is shown that oxygen strongly aff...
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Chapter
Interfacial Tension and Contact Angle in Immiscible Systems by Capillary Pressure Measurements
The recent development of experimentation in space, under microgravity conditions, makes it possible to measure the interfacial tension (σ) between immiscible fluids (organic compounds, liquid alloys…) by a st...
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Article
On the calculation of solid-liquid interfacial tension in metallic systems from contact angle data
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Article
Factors limiting the accuracy of measurements of surface tension by the sessile drop method
Different sources of error in determining surface tension by the sessile drop technique are discussed. The influence of uncertainties in measuring drop co-ordinates are quantitatively evaluated, and the result...
