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Thesis (M.S.)--University of Wisconsin--Madison, 1942. / Typescript. Includes bibliographical references (leaves 74-75).

Thesis (M.S.)--University of Wisconsin--Madison, 1964. / eContent provider-neutral record in process. Description based on print version record. Bibliography: l. [63]-65.

Porous skeletons prepared by sintering loose metal powders have been infiltrated with liquid metals. The systems investigated were nickel-lead, nickel-silver, nickel-copper, iron-copper, iron-silver and iron-silver/copper. Contact angle experiments for the above systems were also performed using the sessile drop technique. It was found that the resultant density of the infiltrated composite depends directly upon the amount of previous deoxidation of the skeleton and also the shrinkage porosity which results from solidification of the molten infiltrant. It was found that the thermodynamic driving force for infiltration is the product ɣlvcos Θ where ɣlvcosΘ = ɣsv -ɣsl. In the systems in which infiltration occurred the contact angle was less than 28° usually being much lower but not zero. In silver-iron system where the contact angle is 36°, infiltration did not occur at all. The infiltration of silver-copper alloys into an iron skeleton was more favourable as the copper content was increased. This was shown to be due to the fact that ɣlvcos Θ increases as the copper concentration increases. In order to determine the rate of infiltration experiments were performed whereby the drop in height of a molten column of infiltrant as a result of infiltration was measured with movie camera. Infiltration was very rapid as porous skeletons of the order of 5 cm in length were infiltrated in less than 0.3 sec. The height of infiltration was found to be proportional to the square root of time and the rate of infiltration, d h/ d t, decreased rapidly with time of infiltration. / Applied Science, Faculty of / Materials Engineering, Department of / Graduate

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A testing apparatus was developed for the determination of the change in permeability of coarse porous media subjected to a decrease in porosity . literature survey was conducted to establish the design criteria for the flow and loading tests. The mthemaUcal model describing flow through course porous media was further developed on a theoretical basis by postulating the layered medium model. Ihis model is a means by which the variability of the particle sizes in the medium is taken into account. The design, construction and operation of the testing apparatus is des:rvx-d. The specimen tested was laded up uo 3,45 MPa; consequently ' the Fbrcheimer aquation in the form of K , Ci/R + Cg was found to yield repeatable values for tiic turbulent friction factor C2, thus providing a means of predicting the change in permeability if the change in porosity and effective particle diameter are known.

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Thesis (M.S.)--West Virginia University, 2004. / Title from document title page. Document formatted into pages; contains xi, 106 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 96-98).