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The present invention relates to a speaker diaphragm having excellent corrosion resistance and
durability, high hardness and high Young's modulus, in which titanium or a titanium alloy is
berylliumized to form a titanium-beryllium fluoride layer on the surface. It is. Prior Art Usually,
titanium, aluminum, beryllium and other light metals such as titanium, aluminum or beryllium
are treated as boride, carbonization, nitridation, etc., or aluminum is treated with alumite
treatment to improve the characteristics, and so on. As a method, a reinforced fiber composite
material containing fibers of high Young's modulus is used. In general, it is desirable that the
weight (ρ) of the diaphragm be as small as possible and the Young's modulus (T) be as large as
possible to achieve high efficiency of the speaker and good transient characteristics. It is difficult
to say that titanium and aluminum, which are usually used because they are easy to process,
have a satisfactory sound velocity f ′ as a high frequency speaker diaphragm. Therefore, as
described above, a diaphragm in which a film such as titanium boride, titanium carbide, titanium
nitride, or alumite is applied by processing these metal surfaces has been developed and put to
practical use as a high-class speaker. Beryllium is also put into practical use by forming it into a
diaphragm by vacuum evaporation. However, titanium boride and titanium carbide. The treated
metal such as titanium nitride and alumite has a thickness of a few μm or less, which is
extremely thin compared to the thickness of the titanium or aluminum base metal, thus
significantly increasing the Young's modulus as shown in Table 1. Has not been reached. −!
Since IJ IJum can not be formed into a diaphragm only by vapor deposition, it requires a large
number of man-hours and is very expensive. The present invention has been made in view of the
above-mentioned present situation, and an object thereof is to provide a material for a speaker
diaphragm which is superior to the conventional one. Means for Solving the Problems In the
present invention, after forming titanium or a titanium alloy as a base material into a desired
shape to achieve this object, the titanium or titanium alloy is embedded in a filling containing
beryllium or a beryllium or germanium IJ IJ compound by heat treatment. It is a diaphragm
material in which a layer of a titanium-beryllium compound is formed on the surface of a base
material. . The present invention is intended to obtain a novel diaphragm material which can not
be obtained by the conventional material having a very large blow rate and low density by
diffusion heat treatment as shown in the following examples. EXAMPLES An example of the
present invention will be described below. EXAMPLE 1 Titanium or an alloy serving as a
diaphragm substrate is formed into a diaphragm shape by using a foil of 30 .mu.
Titanium is a strong metal against oxidation, but it is preferable to expose a new metal surface by
etching prior to beryllium diffusion treatment. First, 5 to 10% by weight of beryllium powder and
about 1% by weight of ammonium fluoride are mixed with 90 to 95% by weight of alumina
powder, and the above-mentioned vibration plate molding is buried in this mixed powder to
obtain 900 in inert gas. When the diffusion heat treatment of IJ IJium at C. is
continued for 1 to 2 hours, titanium-beryllium oxide layers having a diffusion depth of 5 to 10
.mu.m are formed on both sides of the substrate. The diffusion layer can be appropriately
selected depending on the processing temperature of 9 hours. The titanium-beryllium compound
thus formed has a microhardness about 3 to 5 times that of metallic titanium, and the
characteristics are shown in Table 1 in which the Young's modulus is 3 to 3.5 × 10 12 dyne /
err? ', The density is 3.5 to 3.8, which is good as a high-frequency speaker diaphragm material.
Example 2 The same titanium foil molded article as in Example 1 is embedded in a beryllium
powder beryllium fluoride beryllium fluoride, potassium fluoride or potassium chloride molten
salt and the beryllium is infiltrated into titanium at 8.00'-900 ° C.・ Beryllium compounds such
as 1Bez and TiBetz are formed. The material property of this composition is Young's modulus 3
× 1012 dyne / blood 2 ° density 3.8 or so, which is a good diaphragm material as in Example
1. As another example, beryllium compounds are similarly formed also by a method in which
titanium is buried in beryllium powder and heat treatment is performed in a vacuum of 5 × 10
−6 mmHg for 1000 to 1100 ° C. for 3 hours. Effects of the Invention As described above, the
diaphragm material having the beryllium compound layer formed on the titanium surface
according to the present invention is easy to manufacture and the obtained material is excellent
in corrosion resistance, and has high hardness, high Young's modulus, and low density. The
speaker diaphragm is efficient and has excellent transient characteristics. Table 1
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