Method of making a diaphragm of carbonaceous material

Details Method of making a diaphragm of carbonaceous material Method of making a diaphragm of carbonaceous material

1989-06-20

1992-09-22

Tentoni, Leo B.

Plastic and nonmetallic article shaping or treating: processes

Carbonizing to form article

In specific atmosphere

264344, 423448, 423449, C01B 3102, C01B 3104

Patent

active

051494701

ABSTRACT:
The invention relates to a method for manufacturing a full carbonaceous diaphragm for acoustic equipment, which bridging agent which accelerates bridging by reacting, when heated, with a chlorine-containing resin component used as a raw material for carbonation binder binding said graphite powder, kneading the mixture sufficiently to which a resin component dissolution solvent or a plasticizer is added by using a mixer having high shearing force, developing a great affinity for the cloven graphite crystals and the binder resin and dispersing them by a mechanochemical reaction, making the mixture in a sheet form with the graphite crystal face thereof being highly oriented in the face direction of the film, preforming said sheet into a film or a sheet form having a desired thickness by passing it through the calender rolls, molding the preformed film or sheet into a diaphragm shape, removing the contained solvent or plasticizer therefrom by treatment in heated air, accelerating the bridging reaction of the chlorine-containing resin with the bridging agent to obtain a completely hardened molding showing no heat deformation, and sintering the hardened molding in an inert atmosphere, the manufacturing full carbonaceous diaphragm for acoustic equipment having less deformation caused by external forces, less sound distortion, wider reproduced sound range, clearer sound quality and more suitability for a digital-audio are as a diaphragm for speakers and microphones because of its lighter weight, higher elasticity and higher sound propagation velocity compared with the conventional diaphragm materials.

REFERENCES:
Abstract of Japanese Reference 61-151,282.

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