Process of making an acoustic carbon diaphragm

Details Process of making an acoustic carbon diaphragm Process of making an acoustic carbon diaphragm

1988-09-01

1990-04-24

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

Carbonizing to form article

With carbonizing, then adding carbonizable material and...

264 296, 264 42, 264 49, 264 81, 264 85, 264137, 423449, 427227, 427228, 427249, C01B 3102

Patent

active

049198599

ABSTRACT:
A process for producing an acoustic diaphragm of carbonaceous material including the steps of impregnating nonwoven fabric or woven fabric of carbon fiber having a high degree of elasticity with a thermosetting resin, thermally molding it into a diaphragm shape, calcining the shaped fabric in an inert gas atmosphere to obtain a porous carbon molding, heating the porous molding to a uniform temperature, and depositing vapor phase, thermally decomposed carbon upon a surface of the porous molding. The deposited carbon is generated by thermal decomposition of a hydrocarbon-containing material introduced together with a carrier gas. The process produces an acoustic diaphragm having a dense surface layer of carbonized fiber-carbonized thermosetting resin-thermally decomposed carbon, and a porous interior of carbonized fiber bonded together by carbonized resin and the thermally decomposed carbon. Thus, the process permits manufacture of a diaphragm made of a carbon material having a large E/p value with the carbon material mostly made of a carbon fiber having high elasticity and a carbonized residue of a thermosetting resin.

REFERENCES:
patent: 3233014 (1966-02-01), Bickerdike et al.
patent: 3238054 (1966-03-01), Bickerdike et al.
patent: 3317338 (1967-05-01), Batchelor
patent: 3936535 (1976-02-01), Boder
patent: 4178413 (1979-12-01), DeMunda

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