Acoustic vibrating element of graphite and method of manufacturi

Details Acoustic vibrating element of graphite and method of manufacturi Acoustic vibrating element of graphite and method of manufacturi

1981-10-27

1983-08-02

Meros, Edward J.

Metal working

Method of mechanical manufacture

Electrical device making

181167, 423445, 423448, 423458, H04R 3100

Patent

active

043958141

ABSTRACT:
An acoustic vibrating element, such a domed speaker diaphragm A or a phonographic pickup cantilever B, is formed by vapor deposition on an easily separable mold member 5 of tantalum or tantalum alloy when a mixture of a hydrocarbon gas and an inert gas is passed through a furnace heated to a temperature of 1150.degree. C.-1250.degree. C. at a flow rate in excess of 200 cm/min. The c-axis crystalline orientation of the resulting graphite element is substantially perpendicular to its surface, which provides a Young's modulus above 16,000 Kg/cm.sup.2.

REFERENCES:
patent: 3138435 (1964-06-01), Diefendorf
patent: 3297406 (1967-01-01), Diefendorf
patent: 3410746 (1968-11-01), Turkat et al.
patent: 3720499 (1973-03-01), Hirayama et al.
patent: 4254184 (1981-03-01), Tsukagoshi et al.

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