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Full-Text Articles in Engineering
Evaluation Of Organic Additives For Use In Zinc Electrowinning, R. C. Kerby, H. E. Jackson, Thomas J. O'Keefe, Yar Ming Wang
Evaluation Of Organic Additives For Use In Zinc Electrowinning, R. C. Kerby, H. E. Jackson, Thomas J. O'Keefe, Yar Ming Wang
Materials Science and Engineering Faculty Research & Creative Works
Organic additives are used extensively in zinc electrowinning to assist in controlling the process. A cyclic voltammetry technique has been developed to provide a rapid, quantitative evaluation of the effectiveness of selected organic additives in minimizing the deleterious effects that impurities, such as antimony, have on zinc deposition. Results have indicated that animal glues are more effective than the other organic additives tested, which included several gums, enzymes, and amino acids, in relation to the current efficiency of zinc production. Of the various animal glues compared in this research, the most effective appeared to have average molecular weights in the …
Dense Chromium Sesquioxide, P. D. Ownby
Dense Chromium Sesquioxide, P. D. Ownby
Materials Science and Engineering Faculty Research & Creative Works
A sintered, fine grained, polycrystalline, essentially fully dense, essentially single phase Cr2O3 body is prepared by sintering Chromium Sesquioxide (Cr2O3) at essentially the equilibrium oxygen partial pressure (PO2) for the formation of CrO 3 from its elements at the sintering temperature. To achieve optimum theoretical density a second metal oxide dopant such as MgO, capable of controlling the grain size, is added. In addition, Cr2O3 bodies are rendered more stable, and thus have a longer life, by maintaining over the body an atmosphere which is essentially equilibrium Po, …
Evaluation Of Organic Additives For Use In Zinc Electrowinning, R. C. Kerby, H. E. Jackson, Thomas J. O'Keefe, Yar Ming Wang
Evaluation Of Organic Additives For Use In Zinc Electrowinning, R. C. Kerby, H. E. Jackson, Thomas J. O'Keefe, Yar Ming Wang
Materials Science and Engineering Faculty Research & Creative Works
Organic additives are used extensively in zinc electrowinning to assist in controlling the process. A cyclic voltammetry technique has been developed to provide a rapid, quantitative evaluation of the effectiveness of selected organic additives in minimizing the deleterious effects that impurities, such as antimony, have on zinc deposition. Results have indicated that animal glues are more effective than the other organic additives tested, which included several gums, enzymes, and amino acids, in relation to the current efficiency of zinc production. Of the various animal glues compared in this research, the most effective appeared to have average molecular weights in the …
Positron Lifetime As A Function Of Grain Size, Hollis P. Leighly
Positron Lifetime As A Function Of Grain Size, Hollis P. Leighly
Materials Science and Engineering Faculty Research & Creative Works
Published data on positron annihilation lifetime in copper as a function of grain size have been analyzed to show that there is a linear relationship between the internal grain boundary surface area, per unit volume, S v, and the positron lifetime, τ. The analysis indicates that grain boundaries are important in the trapping of positrons. It is suggested that the slope of the resulting straight line, dS v/dτ, can be used to determine the annihilation rate of the grain boundaries. © 1977 Springer-Verlag.
Low Order Correction For Subsurface Contributions In Diffusion Experiments, D. Powers, Manfred Wuttig
Low Order Correction For Subsurface Contributions In Diffusion Experiments, D. Powers, Manfred Wuttig
Materials Science and Engineering Faculty Research & Creative Works
No abstract provided.
Glass In The Year 2000, Norbert J. Kreidl
Glass In The Year 2000, Norbert J. Kreidl
Materials Science and Engineering Faculty Research & Creative Works
No abstract provided.
Subsolidus Equilibria And Stabilization Of Tetragonal Zro2 In The System Zro2‐Al2o3‐Sio2, Charles A. Sorrell
Subsolidus Equilibria And Stabilization Of Tetragonal Zro2 In The System Zro2‐Al2o3‐Sio2, Charles A. Sorrell
Materials Science and Engineering Faculty Research & Creative Works
The irreversible reaction between zircon and alumina to form mullite and zirconia was observed to proceed very slowly at 1480°C, confirming the existence of a stable join between mullite and zirconia in addition to the join between mullite and zircon. Attempts to determine equilibrium assemblages in powder samples of several combinations of the constituents at 1300° and 1400°C were unsuccessful. Metastable tetragonal ZrO2 was observed in fired powder samples containing kaolinite, in fired zircon‐alumina samples, and in calcined gels prepared from zirconyl nitrate, aluminum nitrate, and colloidal silica in water. Tetragonal ZrO2 was the dominant crystalline phase in …
Suggested Chemistry Of Zinc Oxychloride Cements, Charles A. Sorrell
Suggested Chemistry Of Zinc Oxychloride Cements, Charles A. Sorrell
Materials Science and Engineering Faculty Research & Creative Works
Solutions of ZnCl2 were prepared from ZnCl2·nH2O and by reaction of zinc metal with HCl. Specific gravities and pH values were determined as a function of composition. A ternary phase, 4ZnO·ZnCl2·5H2O, was precipitated when the ZnCl2 solutions were diluted to a pH of 5.48 ± 0.05. Mixtures of ZnO with ZnCl, and HCI solutions were equilibrated in sealed containers and analyzed by X‐ray diffraction. The resulting phase diagram shows 2 ternary phases, 4ZnO·ZnCl2·5H2O (4·1·5) and ZnO·ZnCl2·2H2O (1.1.2), both of which are soluble …
The Al2o3‐Sio2‐Zro2 Liquidus Surface: A Discussion, Charles A. Sorrell
The Al2o3‐Sio2‐Zro2 Liquidus Surface: A Discussion, Charles A. Sorrell
Materials Science and Engineering Faculty Research & Creative Works
No abstract provided.