High Temperature Chemical Interaction Between SSiC Substrates and Ag-Cu Based Liquid Alloys in Vacuo

In this paper, a permeable steel-slag–bitumen mixture (PSSBM) was first prepared according to the designed mixture ratio. Then, the interaction characteristics between steel slag and bitumen were studied. The chemical interaction between bitumen and steel slag was explored with a Fourier-transform infrared spectrometer (FT-IR). The influence of steel-slag chemistry, mineral composition, and bitumen reaction on phase angle, complex shear modulus (CSM), and rutting factor was explored with dynamic shear rheological (DSR) tests. The PSSBM had better properties, including high permeability, water stability, Marshall stability, high-temperature (HT) stability, and low volume-expansion rate. Bitumen-coated steel slag can prevent heavy-metal ions from leaching. In the infrared spectra of the mixture of a chemical component of steel slag (calcium oxide) and bitumen, a new absorption peak at 3645 cm−1 was ascribed to the SiO–H stretching vibration, indicating that new organic silicon compounds were produced in the chemical reaction between calcium oxide and bitumen. SiO–H had an obvious enhancement effect on the interfacial adhesion and high-temperature rheological property of the mixture. In the mineral components of steel slag, dicalcium and tricalcium silicate reacted with bitumen and generated new substances. Chemical reactions between tricalcium silicate and bitumen were significant and had obvious enhancement effects on interfacial adhesion and high-temperature rheological properties of the mixture. The results of FT-IR and DSR were basically consistent, which revealed the chemical-reaction mechanism between steel-slag microcomponents and bitumen at the interface. SEM results showed that pits and grooves on the surface of the steel-slag aggregate, and the textural characteristics provide a framework-like function, thus strengthening the strength and adhesion of the steel-slag–bitumen aggregate interface.

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High Temperature Chemical Interaction Between SiO2 Substrates and Ag-Cu Based Liquid Alloys in Vacuo

Materials Science Forum ◽

10.4028/www.scientific.net/msf.509.117 ◽

2006 ◽

Vol 509 ◽

pp. 117-122 ◽

Cited By ~ 1

Author(s):

Jorge López-Cuevas ◽

Carlos A. Gutiérrez ◽

Martin I. Pech-Canul ◽

M. Castro-Román ◽

Juan Carlos Rendón-Angeles

Keyword(s):

Chemical Interaction ◽

Liquid Alloys ◽

Ceramic Surface ◽

Metal Interface ◽

Small Particles ◽

Silver Alloys ◽

Fused Quartz ◽

Metal Ceramic ◽

Quartz Substrates ◽

Relative Thermodynamic Stability

The interfaces formed between vitreous or thermally devitrified fused quartz substrates and silver alloys after 90 min at 850 °C in vacuum have been characterized. Three silver alloys have been used: Cusil (Ag–28 wt % Cu), Cusil-ABA (Ag–35 wt % Cu–1.5 wt % Ti), and Incusil-ABA (Ag–27 wt % Cu–12 wt % In–2 wt % Ti). A non wetting condition is found for the Cusil alloy in both substrates. In contrast, the formation of Ti5Si3, Cu3Ti3O and Ti2O3, following the sequence SiO2 → Ti2O3 → Ti5Si3 → Cu3Ti3O, is observed at the metal/ceramic interface for the two titaniumcontaining alloys on both substrates. Ti2O3 is commonly found as small particles dispersed in a silver-rich matrix. During the experiments, the reaction product layers detach from the ceramic surface and float away from the ceramic/metal interface due to their relatively low density with respect to the liquid alloy. The formation of the phases detected at the ceramic/metal interface can be explained in terms of their relative thermodynamic stability.

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Application of the setaram high temperature calorimeter for determination of mixing enthalpies of liquid alloys

Thermochimica Acta ◽

10.1016/0040-6031(79)85138-2 ◽

1979 ◽

Vol 28 (2) ◽

pp. 349-358 ◽

Cited By ~ 42

Author(s):

M.J. Pool ◽

B. Predel ◽

E. Schultheiss

Keyword(s):

High Temperature ◽

Liquid Alloys ◽

Mixing Enthalpies

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Thermochemical properties of liquid alloys along xCu/xSb= 0.2/08 section of the ternary Cu-Sb-Ce system

French-Ukrainian Journal of Chemistry ◽

10.17721/fujcv5i2p24-29 ◽

2017 ◽

Vol 5 (2) ◽

pp. 24-29 ◽

Cited By ~ 1

Author(s):

Natalia Kotova ◽

Michael Ivanov ◽

Natalia Usenko

Keyword(s):

Experimental Data ◽

High Temperature ◽

Cross Section ◽

Analytical Method ◽

Composition Dependence ◽

Liquid Alloys ◽

Thermochemical Properties ◽

Enthalpies Of Mixing ◽

The Cross ◽

Toop Model

The enthalpies of mixing of liquid alloys of the ternary Cu–Sb–Ce system were studied by high-temperature calorimetry along the cross-section = 0.2/0.8. The composition dependence of these values were modelled using four "geometric" models and also the analytical method of Redlich–Kister–Muggianu. A comparison of the experimental data for the cross section = 0.2/0.8 and simulated values of the enthalpies of mixing showed that the most suitable for describing the properties of liquid alloys of ternary Cu–Sb–Ce system is the Toop model.

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High Temperature Chemical Interaction Between SSiC Substrates and Ag-Cu Based Liquid Alloys in Vacuo

Materials Science Forum ◽

10.4028/www.scientific.net/msf.509.111 ◽

2006 ◽

Vol 509 ◽

pp. 111-116 ◽

Cited By ~ 3

Author(s):

Jorge López-Cuevas ◽

Juan Carlos Rendón-Angeles ◽

J.L. Rodríguez-Galicia ◽

M. Herrera-Trejo ◽

J. Méndez-Nonell

Keyword(s):

Electron Microscopy ◽

Chemical Interaction ◽

Silica Film ◽

Liquid Alloys ◽

Ceramic Surface ◽

X Ray Diffraction ◽

Metal Interface ◽

X Ray ◽

Metal Ceramic ◽

Scanning Electron

The interfaces formed at 850 °C under vacuum between polished or oxidized substrates of pressureless sintered α-SiC (SSiC) and Cusil, Cusil-ABA and Incusil-ABA brazing alloys have been characterized by X-ray diffraction, scanning electron microscopy and energy dispersive spectroscopy. No chemical interaction is observed for Cusil on both SSiC substrates. In contrast, the Ti contained in the Cusil-ABA and Incusil-ABA alloys promotes the occurrence of chemical reactions at the metal/ceramic interface with both SSiC substrates. The formation of TiC and Ti5Si3 is observed for Cusil-ABA and Incusil-ABA on untreated SSiC, following the sequence SiC → TiC → Ti5Si3 at the metal/ceramic interface. The formation of Ti5Si3 and Cu3Ti3O, following the sequence SiC → Ti5Si3 → Cu3Ti3O, is observed for both Ti-containing alloys on pre-oxidized SSiC. During the wetting experiments, Ti5Si3 and Cu3Ti3O detach from the ceramic surface, floating away from the ceramic/metal interface into the liquid alloy, where the latter phase partially dissolves. It is concluded that for both Ti-containing alloys in contact with pre-oxidized SSiC, the Ti remaining after the reaction with the silica film is insufficient to decrease the contact angle to the values observed for untreated SSiC or to produce a strong metal/ceramic joint.

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