Specialized metallurgical processes – compositions for use therei – Compositions – Consolidated metal powder compositions
Patent
1984-08-06
1986-04-08
Lieberman, Allan M.
Specialized metallurgical processes, compositions for use therei
Compositions
Consolidated metal powder compositions
75228, 75245, 419 8, 419 23, 419 5, 420555, 420563, 420587, 428546, 428570, 428929, B22F 300, B22F 312, B22F 324
Patent
active
045810702
ABSTRACT:
An acoustical transducer is provided with an acoustically absorbant backing material having an acoustical impedance precisely matching the impedance of the piezoelectric element in the transducer. The backing material is a multiphase mixture of selected materials, such as a low melting point alloy (InPb) and one or more powders having high impedance characteristics (tungsten and copper). The slope of the curve impedance versus volume fraction of the backing components is low, thus allowing the impedance of the material to be precisely controlled. The backing material is preferably electrically conductive and is fuzed to one surface of the piezoelectric element to further improve the output characteristics of the transducer.
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patent: 3663842 (1972-05-01), Miller
Article entitled "Ultrasonic Properties of Transducer Backings," by C. M. Sayers and C. E. Tait, published in Ultrasonics, Mar. 1984, pp. 57-60.
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J. D. Larson and J. G. Leach, "Tungsten-Polyvinyl Chloride Composite Material-Fabrication & Performance"; and S. Lees, R. S. Gilmore and P. R. Kranz, Acoustic Properties of Tungsten-Vinyl Composites, IEEE Transactions on Sonics and Ultrasonics, SU-20, 1 (1973).
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Bar-Cohen Yoseph
Hoppe Wally C.
Stubbs David A.
Lieberman Allan M.
Systems Research Laboratories Inc.
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