Results 211 to 220 of about 11,568 (264)
Earth’s inner core composition inferred from the equations of state of Fe-Si-C-H alloys
Kolesnikov E +10 more
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Hardening of Gold-Based Alloys
Journal of Dental Research, 1977The relationships between composition, heat treatment, hardness and microstructure have been investigated for a number of commercial dental casting alloys and for several series of experimental gold-silver-copper compositions. The results indicate that at least two distinct hardening mechanisms must occur in these alloys.
K F, Leinfelder, D F, Taylor
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The gold solder, gold alloy interface
Australian Dental Journal, 1977Abstract— With soldering the physical properties of the basis metal must be maintained and a minimum of molten metal is used. An examination of joints in 17 gauge platinized gold wire is made with 18 k gold solder following quenching immediately after flow and cooling in air; there is a widening of grain boundaries and intergranulation penetration in ...
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Journal of Dental Research, 1972
A neodymium glass laser was used to produce weld joints between test pieces of four different casting gold alloys. The mechanical properties of the welds were determined and their microstructures were evaluated. The results of this study indicate that laser welding of dental casting gold alloys is metallurgically feasible.
D L, Smith, A P, Burnett, T E, Gordon
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A neodymium glass laser was used to produce weld joints between test pieces of four different casting gold alloys. The mechanical properties of the welds were determined and their microstructures were evaluated. The results of this study indicate that laser welding of dental casting gold alloys is metallurgically feasible.
D L, Smith, A P, Burnett, T E, Gordon
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The Colour of Gold and Gold Alloy Electrodeposits
Transactions of the IMF, 1983The thickness of gold required to cover the colour of the substrate has been determined and found to be 0.23 μm for a matt gold deposit on a substrate prepared to 600 grit and 0.06 μm for a bright ...
D. J. Arrowsmith, Geraldine Brown
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Chemical Composition of Dental Gold Casting Alloy and Dental Wrought Gold Alloys
Journal of Dental Research, 1969The chemical composition of dental casting gold alloys and dental wrought gold wire alloys was determined by use of a modification of a previously described X-ray emission method. Since 1928 and 1932 there has been little change in either type of alloy; there has been a decrease in platinum content in both, and 1 % nickel is now found in wire alloys.
J D, Eick +3 more
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Observations on gold-palladium-silver and gold-palladium alloys
The Journal of Prosthetic Dentistry, 1980Properties, heat treatment response, structure, and composition of three high-fusing crown and fixed partial denture alloys were studied. Except for elongation, the properties of two gold-palladium-silver based materials were compared to those of a gold-palladium alloy.
S G, Vermilyea, E F, Huget, J M, Vilca
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Metallographic techniques in gold alloy study: Delamination in a white gold alloy
Metallography, 1984Abstract The structure and phase transformations that occurred during the working and heat treatment of an eighteen-carat gold alloy used in jewel making were studied. A delamination phenomenon encountered during rolling was attributed to the formation of a discontinuous globular phase, clearly observable in the microscope, but chemically ...
Maria Giuseppina Ienco +2 more
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1991
The bulk diffusion of gold into rhodium in thin films has been studied by [13]. Do was found to be 4.2 x 10−11 cm2/s and Q=0.93±0.28 eV. The bulk diffusion coefficients are plotted against reciprocal temperature in Fig. 173. The authors point out that these values of Q and Do are lower than would be expected for lattice diffusion in face-centred cubic ...
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The bulk diffusion of gold into rhodium in thin films has been studied by [13]. Do was found to be 4.2 x 10−11 cm2/s and Q=0.93±0.28 eV. The bulk diffusion coefficients are plotted against reciprocal temperature in Fig. 173. The authors point out that these values of Q and Do are lower than would be expected for lattice diffusion in face-centred cubic ...
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Electropolishing of gold and gold-rich alloys
Micron (1969), 1977Abstract The use of a mixture of sulphuric and hydrochloric acid is proposed for electropolishing gold and gold-rich alloys for study by electron microscopy. The results obtained using the proposed electrolyte are illustrated using an ordered Au4Zn specimen in which different phases of Au3Zn(H) and Au3+Zn can be recognized.
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