Inaug.-diss.--Basel. / Lebenslauf. Includes bibliographical references.

Inaug.-diss.--Basel. / Lebenslauf. Includes bibliographical references.

No description available.

No description available.

Typescript (photocopy) / 111 leaves, [20] leaves of plates : ill. ; 30 cm. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / Thesis (Ph.D.)--Dept. of Chemical Engineering, University of Adelaide, 1982

Thesis (MPhil) -- AUT University, 2008. / Includes bibliographical references. Also held in print (145 leaves : ill. ; 30 cm.) in the Archive at the City Campus (T 669.95 YAN)

The influence of oxygen on the wetting of sapphire (α-Al₂O₃) by liquid copper was investigated using the sessile drop technique in vacuum at 1230°C. For additions to copper of cupric oxide, varying from 1 – 72% of the copper weight, chemical reaction at the liquid-solid interface resulted in spreading of the liquid and a rapid decrease of the contact angle to a steady state value. A direct relationship between the fourth power of the basal radius of the molten drop and the oxygen present was observed. The product of the interfacial reaction was found to be CuAlO₂. Phase diagrams of the systems CuO-Al₂O₃ and Cu₂O-Al₂O₃ were determined experimentally using X-ray diffraction techniques for identification of the phases. The aluminates, Cu(AlO₂)₂ and-CuAlO₂ were identified and their ranges of stability in air established. / Applied Science, Faculty of / Materials Engineering, Department of / Graduate

The wettability of Mg0 by liquid iron was studied using the sessile drop technique in vacuo at 1550°C. Specimens of vacuum-cast iron were melted on single crystals of optical-grade magnesium oxide. Tests were limited to two minutes because of iron volatilization. Chemical reaction at the liquid-vapor interface caused the contact angle to decrease from 117° to 65° during the first minute. Reaction between the iron and oxygen provided through the dissociation of Mg0 resulted in formation of an Fe0 layer over the drop surface. The Fe0 was drawn to the base of the drop where it accumulated as an annular Interfacial deposit. After solidification, the Fe0 decomposed to magnetite with separation of iron. Within the peripheral annulus the interface showed no sign of chemical attack. This effect was related to formation of a protective interfacial monolayer from electropositive impurities initially present in the iron. The major constituent of the monolayer appeared to be silicon although positive identification was not achieved. Chemical reaction occurred in each case where alloying additions to the iron of Ti, V, Cr, Nb, Ta, and Zr were made. Variation of contact angle with concentration was studied. Both V and Cr improved the wettability. The effect of Zr, Ti, Nb, and Ta on the wettability was not determined because oxide deposits around the basal periphery of the drops restricted expansion. Complete interfacial attack was observed with additions of Zr, Ti, and V whereas additions of Nb, Ta, and Cr resulted in an annular interfacial deposit around the drop perimeter similar to the pure Fe-Mg0 specimens. This phenomena supported the existence of an interfacial monolayer. / Applied Science, Faculty of / Materials Engineering, Department of / Graduate

No description available.

129 leaves : ill., tables ; 30 cm. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / Thesis (Ph.D.)--University of Adelaide, Dept. of Physics, 1978