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JPS6386855

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DESCRIPTION JPS6386855
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
mounting apparatus used for mounting a thermal spray substrate such as a metal foil having a
thickness of 200 .mu.m or less on the surface of the thermal spray substrate. (Prior Art) In the
conventional apparatus, when spraying on a thin metal foil having a curved surface, the metal foil
substrate 1 formed as shown in FIG. We use what fixed the circumference with screw 4 and
attach. As shown in FIG. 3, the thermal spray gun 8 melts and sprays the thermal spray powder 8
onto the metal foil substrate fixedly mounted in this manner to form the thermal spray coating 5.
<Problems to be Solved by the Invention) During the thermal spraying, a slight amount of air
confined between the metal foil substrate and the back mold expands with the heat during the
thermal spraying to form the nitrogen cavities 6, and this metal foil It has disadvantages such as
deformation of the substrate and damage to the substrate due to the pressure of the expanded
air. The same phenomenon occurs in the thermal spray base mounting device for fixing the
periphery not only on the curved base shown in FIG. 2 but also on the flat base as shown in FIG.
Since the deformation and breakage that occur during thermal spraying on a thin metal foil
sprayed substrate are more frequent as the energy of the thermal spray jet is higher, it is the
current situation that thermal spraying is performed with relatively low energy to prevent this. In
this case, however, the characteristic is the lower left direction of the curve of Fig., And the dense
Xi strength of the sprayed coating and the substrate is low, the coating is porous and the specific
elastic modulus is small. (Means for Solving the Problems and Actions) The present invention is
made to solve the above-mentioned drawbacks, and in forming a sprayed coating on a sprayed
substrate such as a metal foil having a melting point of n-1, fG spraying The back mold 1c is
made of a porous metal or porous ceramic with continuous fine pores in order to allow a small
amount of air confined between the thermal spray substrate to which the material is mounted
and the back surface of the same shape to escape. It is an object of the present invention to
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provide an apparatus for mounting a thermal spray base material. When applying the thermal
spray coating to applications such as speaker diaphragms, the adhesion strength between the
thermal spray coating and the thermal spray coating substrate is large, and the high specific
elasticity-is-! ! ! The thermal spray substrate attaching apparatus according to the present
invention is particularly effective for thin substrates such as gold 'f 476 which is more easily
deformed due to thermal energy C during thermal spraying ((Example) the present invention An
embodiment will be described. Embodiment 1 FIG. 1 is a schematic diagram of a main part of an
example of the present invention. The surface of the base H obtained by dome-shaped AL foil
with a thickness of 50 μm was treated with 4 # 100 to 120 abrasive powder and used as the
sprayed substrate l, and the back of the same has continuous fine pores 9 of the same shape.
Close to the mold 2 and mount it.
Fix the sprayed base material l and the back mold 2 / g: 3. A screw 4 is used to fix the sprayed
substrate slightly in tension. The thermal spray powder contains AA, O, and T t 02 and C 00 + Aj
B as the main components, and in this example, the characteristic values of the thermal spray
coating using this thermal spray powder will be explained Powder Z ro2. Cr2O3,、
NiCr、Al。 The device of the present invention can be applied to all things such as TlC.
The thermal spray powder is sprayed onto the substrate l by the thermal spray gun 7 and the
thermal spray jet 8 in the same manner as in FIG. Although not shown, the apparatus is
configured to rotate and move so that the thermal spray coating adheres to the thermal spray
substrate to a uniform thickness. The relationship between the A2 foil sprayed substrate and the
back mold during thermal spraying is a metal porous body in which the back mold has fine pores
even if the volume of air existing between the sprayed substrate and the back mold is expanded
by the heat of the spray jet. Because the expanded air is continuous micropores] close to 0,
escaped to the foreigner by the expanded air A, 1! There is no damage caused by deformation of
the foil substrate. EXAMPLE 2 In addition to the present invention, the same effect as in Example
1 can be obtained by applying a porous ceramic such as unglazed as back to the example. Next,
as an example of the characteristics of hot metal rind according to these examples, improvement
in adhesion strength between the sprayed coating and the base material and '+ f property of
specific elastic modulus will be described. FIG. 4 shows the measurement results when the
operating current of the thermal spray gun is changed to 600 to 1200 AK, and the thermal spray
distance is 20 cm + the thickness of the thermal spray coating is 40 μm. As apparent from this
figure, the larger the working voltage and pressure of the thermal spray gun, the more the
adhesion strength and the specific elastic modulus of the thermal spray coating adhere to the
substrate and the thermal conductivity, but the work is more than 1200A. The material is melted
by the heat of the thermal spray jet and can not be used. Incidentally, the coating sprayed by the
conventional mounting apparatus not according to the present invention to the back mold for
mounting the A2 foil sprayed base is deformed as shown in FIG. As a result, both the adhesion
strength and the specific elastic modulus are extremely reduced. For this reason, in the
conventional apparatus, it will spray by 800 or less, and the characteristic is thought. However,
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according to the present invention, since the mounting apparatus formed of porous metal or
ceramic having continuous micropores is used as the back mold for closely attaching the thermal
spray base material when irradiating 61 to the gold rA75, it was expanded by the sensible heat
Because the air trapped between the substrate and the back mold escapes out, the thin sprayed
substrate does not deform even in high energy spraying of 800A or more, and a good sprayed
coating is formed as shown in the upper right of Fig. 4 curve. Can.
Although the above description has been made on the person-one foil sprayed base material, the
same effects can be obtained with other metal foils; The effect of the present invention is
particularly remarkable in foils. (Effects of the Invention) Therefore, the mounting apparatus of
the present invention can form five metal foil spray coatings with a thickness of about 200 μm
or less, which are used for speaker diaphragms etc.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a cross-sectional view of a mounting apparatus in which a back side of a thermal spray
mounting base according to the present invention is formed by a continuous microporous porous
body.
The second section is a cross-sectional view of a substrate mounting apparatus conventionally
used to thermally spray metal foil substrates. FIG. 3 is a cross-sectional view showing the state of
deformation of the base material and the thermal spray coating when thermal spraying is
performed using the conventional apparatus. 4 is a relationship diagram obtained by using the
apparatus of the present invention, the relationship between the operating current of the thermal
spray gun and the adhesion strength and the specific elastic modulus of the thermal spray
coating. 1) Metal foil base 1 'for thermal spraying base 2 deformed by thermal spraying with
conventional equipment N 2 Mounting device back mold 3 of the present invention 3 ... solid
Horingu 4 ...... bis 5 ...... cavity 7 generated by the thermal spray coating 6 ----- spray ...... spray
gun 8 ...... spraying Jet 9 · · · · · · Back-type continuous fine holes 10 according to the present
invention · · · Back-type of the conventional mounting device S Figure 1 ^ 4th factor 4 loss f /) II
Ka shoulder 1 Te L (A) No. 211
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