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JPS55114097

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DESCRIPTION JPS55114097
Description 1, title of the invention
Carbon diaphragm
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a carbon
diaphragm mainly used for acoustic equipment. In general, a diaphragm for an audio device,
particularly a thin plate used as a diaphragm of a speaker, is light in weight, large in rigidity, and
has a Young's modulus X and a density ρ for efficient and faithful reproduction over a wide
frequency band. And the ratio stiffness E / こ is required to be large. From these points, materials
such as wood pulp, aluminum and titanium have been conventionally used, but it has been
difficult to say that all of them have sufficient characteristics. That is, although there are boron,
beryllium, carbon, etc. as materials with large 冨 / ρ, these materials have poor processability,
and when titanium and aluminum are used, material 6 has relatively good processability.
However, there is a disadvantage that the relative stiffness X / p does not increase in its physical
properties. In addition, although the one in which the diaphragm is made of EndPage: 1
composite material in which synthetic resin carbides are oriented to scaly graphite is light in
weight and high in rigidity, it is formed only by a carbon matrix and the carbon molecules are
separated each other. It is considered to be simply bonded by Delwars Blue, and there is a defect
that the mechanical strength is weakened due to the porous structure due to the generation of a
decomposition gas at the time of firing. The present invention has been made in view of the
above-mentioned point. The object of the present invention is to use a silicon-boron-based
semiconductive composite material of a diaphragm shape composed of a carbon matrix of scaly
graphite and synthetic resin carbide. It is disclosed in JP-A-2007-147118 that the silicon-boron
semi-inorganic polymer and the carbon matrix are bound in an indeterminate state by immersing
in a solution in which an inorganic polymer is dissolved in a solvent and re-baking in a
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nonoxidizing atmosphere. Japanese Patent Publication No. 55 ”114097 (2) It is an object of the
present invention to provide a carbon diaphragm which is strong in mechanical strength and
excellent in machinability, large in stiffness, light in weight and high in rigidity. Hereinafter, the
details of the present invention will be described together with the manufacturing method. First,
an example of the process for producing a composite material comprising a carbon matrix
constituting the present invention will be briefly described. First, the scaly graphite is mixed with
a synthetic resin, and then the scaly graphite and the scaly graphite are oriented in the thickness
direction as a sheet of raw material such as the scaly graphite and the synthetic resin by an
appropriate means such as a roll rolling method. Thereafter, the shape of the diaphragm, for
example, if it is a speaker diaphragm, is molded into an appropriate shape such as a cone shape
or a dome shape and set in a mold in a vacuum furnace and the synthetic resin is carbonized by
gradually raising the heating temperature. To form a carbon matrix composite with the scaly
graphite.
The synthetic resin used in the above-mentioned production may be any of thermoplastic or
thermosetting synthetic resins, but it is important to heat only if it is a synthetic resin which can
be carbonized, for example, polyvinyl chloride, polyimide, phenol Each synthetic resin with a
good carbon yield, such as, is used. Then, the present invention comprises a first step of
immersing the carbon matrix composite produced as described above in a solution in which a
silicon-boron semi-inorganic poly-i is dissolved in a solvent, and then in a non-oxidative
atmosphere. It manufactures through the 2nd process of heating and re-baking. In the above
manufacturing process, when the carbon matrix is manufactured with a weight ratio of scaly
graphite 200: vinyl chloride 100, the carbonization temperature in the vacuum furnace is about
500 ° C. Then, tetrohydrofuran is used as a solvent for dissolving the silicon-boron semiinorganic polymer. Moreover, the non-oxidizing atmosphere in the second step is, for example, an
atmosphere of nitrogen gas, and the heating temperature for re-baking is 600 ° C. to 1200 ° C.
The composite material of the carbon matrix of the graphite and the synthetic resin carbide
produced through the above-described steps is bonded with a silicon-boron semi-inorganic
polymer to form a composite material in an amorphous state containing a covalent bond.
Therefore, the corrosion resistance, heat resistance and mechanical strength are greatly
improved. Moreover, since the carbon matrix is used as the main material, it is lightweight and
highly rigid, and 罵 / ρ is large. EndPage: 2 As described above, the carbon diaphragm obtained
by the present invention is bonded to a carbon matrix composite material using a silicon-polon
semi-inorganic polymer as a binder, thereby forming an amorphous state including a covalent
bond. Thus, the mechanical strength, the corrosion resistance, the heat resistance, and the
processability are excellent as compared with the conventional diaphragm formed only by the
carbon matrix. In addition, since the carbon matrix is formed as the main material, it is effective
in making it lightweight and highly rigid and having high mechanical strength. Patent Issuer
Pioneer Stock Expense Inc. EndPage: 3
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