ISSN:
1573-4803
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract Bubble-encapsulated silver or gold spheres ranging in size from less than 1 to about 500 μm in diameter can be prepared in quenched oxide glasses. High metal concentrations (〉 1% Ag2O, Au2O3, etc. equivalent), imperfect batch mixing and melting procedures, and melt viscosities between 10 and 5000 poise, all favour metal sphere formation over either complete agglomeration or colloidal dispersion. The release of the latent heat of fusion when the metal freezes can, apparently, expand either small amounts of residual gases or the small void created by metal solidification to form a bubble. Rapid quenching appears to freeze the bubble. In contrast, subsequent slow cooling below the melting point of the metal may allow each bubble to collapse around its sphere.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00550092
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