JPH11339932A - Electrode of sintered conductive body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stably connect electrode terminal boards with a simple structure in no defective contact by fixing the electrode terminal boards arranged in face contact with electrode thermal spraying faces formed on both side faces of a sintered conductive body with a metal conductor film formed on the electrode terminal boards by thermal spraying. SOLUTION: An aluminum film is fixed by thermal spraying to both end faces 11 of a sintered honeycomb conductive body 10 to form electrode thermal spraying faces 12. Electrode terminal boards 13 are arranged in face contact with the electrode thermal spraying faces 12, the portions of the upper faces of the electrode thermal spraying faces 12 over the upper faces of the electrode terminal boards 13 and their electrode end sections 13a are covered with a metal conductor film 14 by thermal spraying, and the electrode thermal spraying faces 12 and the electrode terminal boards 13 are fixed in the face contact state. The electrode end sections 13 are tapered, and the metal conductor film 14 is uniformly welded with no step even at the electrode end sections 13a. The metal conductor film 14 is connected to the electrode thermal spraying faces 12 through multiple tapered holes 13b provided on the electrode terminal boards 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrode of a conductive sintered body (ceramic heater) used for an electric resistance heating device.

[0002]

2. Description of the Related Art Conventionally, an electric heater used for an electric resistance heating device such as a hot air generator or the like uses a metal-based electric resistor, a barium titanate-based positive characteristic ceramic heater, or a silicon carbide-based heater. There is a type using a ceramic heater and the like, and the shape of the ceramic heater includes a type formed into a plate shape, fins adhered in a sandwich shape, and a type formed into a honeycomb shape.

FIG. 4 is a partially exploded perspective view of a conventional hot-air generator using a ceramic heater. The honeycomb-shaped conductive sintered body 1 formed in a cubic shape has two end faces 2, 2 on both sides.
Planar electrode 3, made of conductive paste or aluminum
3 is formed, and the electrode terminals 5 and 5 are constantly pressed against the sheet electrodes 3 and 3 at a constant pressure by springs 6 and 6 with a conductive sheet 4 and 4 having good adhesion therebetween. The electrode of the conductive sintered body 1 is configured. Note that 7
Reference numeral denotes an air passage for blowing hot air to the honeycomb-shaped conductive sintered body 1 by a fan 9 driven by a motor 8 to obtain hot air.

[0004]

In the above-mentioned conventional electrode of a conductive sintered body, a conductive sheet is interposed between a planar electrode formed by applying a conductive paste or the like to a side end surface of the conductive sintered body. In order to press the electrode terminal plate with a spring, a metal fitting for fixing the spring is required, or the insulation of the members of the electrode terminal plate is required, which complicates the configuration.
Since contact failure and the like due to oxidation of the electrode surface due to heat are likely to occur, an electrode structure with a simple configuration and no contact failure has been demanded.

[0005]

SUMMARY OF THE INVENTION In order to solve this problem, the present invention provides an electrode terminal plate which is provided in surface contact with electrode sprayed surfaces formed on both side end surfaces of a conductive sintered body. An electrode of a conductive sintered body that is fixed on the electrode terminal plate by a metal conductor film formed by thermal spraying. An electrode of a conductive sintered body having a simple configuration and having no contact failure can be obtained.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is to provide an electrode terminal plate which is provided in surface contact with electrode sprayed surfaces formed on both end surfaces of a conductive sintered body. An electrode of a conductive sintered body that is fixed on the terminal plate with a metal conductor film formed by thermal spraying, and the electrode sprayed surface of the conductive sintered body and the electrode terminal plate are fixed with a metal conductor film formed by thermal spraying. In addition, there is an effect that an electrode of a conductive sintered body having a simple structure and having no contact failure can be obtained without requiring a complicated structure.

According to a second aspect of the present invention, an electrode end portion of an electrode terminal plate which is disposed so as to be in surface contact with electrode sprayed surfaces formed on both end surfaces of a conductive sintered body is tapered. The electrode of the conductive sintered body according to claim 1, wherein the electrode end portion of the electrode terminal plate that is in contact with the electrode sprayed surface of the conductive sintered body has a tapered shape, so that a metal conductive film covering the electrode end plate is provided. Has the effect of uniformly welding without any step and increasing the surface contact strength between the electrode sprayed surface and the electrode terminal plate.

According to a third aspect of the present invention, there is provided a tapered hole in a central surface portion of an electrode terminal plate which is disposed so as to make surface contact with electrode sprayed surfaces formed on both end surfaces of a conductive sintered body. 2. The electrode of a conductive sintered body according to claim 1, wherein the electrode sprayed surface and the electrode terminal plate are connected by a metal conductor film formed by spraying through the tapered hole. Since the electrode sprayed surface and the electrode terminal plate are connected by the metal conductor film sprayed on the tapered hole of the electrode terminal plate in contact with the surface, the joint strength is improved, and furthermore, since the joint portion is a hole, thermal spraying is performed. Thermal stress is distributed,
This has the effect of preventing thermal breakdown of the electrode sprayed surface of the conductive sintered body.

According to a fourth aspect of the present invention, there is provided the conductive sintered body according to the first aspect, wherein the electrode terminal plate is fixed to the electrode sprayed surface by a claw-shaped fixing portion provided on a side of the electrode terminal plate. Since it is an electrode and a claw-shaped fixing part is provided on the side of the electrode terminal plate, the metal conductor film is sprayed without temporarily fixing with another fixing tool to fix the electrode terminal plate to the electrode sprayed surface This has the effect that the mounting strength of the electrode terminal plate can be improved.

An embodiment of the present invention will be described below with reference to the drawings. (Embodiment) FIG. 1 is a partially exploded perspective view of a hot air generator using electrodes of a conductive sintered body according to an embodiment of the present invention, and FIG. 2 is a conductive sintered body according to an embodiment of the present invention. FIG. 3 is a partial cross-sectional view taken along line AA of FIG. 2. FIG. 3 is, for example, a silicon carbide-based honeycomb-shaped conductive sintered body formed in a cubic shape. 1
Ceramic heaters that generate heat when a voltage V is applied to the electrodes 11 and 12 are fixed to both end surfaces 11 and 11 of the honeycomb-shaped conductive sintered body 10 by thermal spraying. Face, 13, 13
Is an electrode terminal plate made of, for example, an aluminum metal plate and disposed so as to be in surface contact with the electrode sprayed surfaces 12 and 12.

Further, a detailed description will be given of a state in which the electrode terminal plates 13 for current supply are connected to the honeycomb-shaped conductive sintered body 10. And an aluminum coating is fixed by thermal spraying to form electrode sprayed surfaces 12, 12, and electrode terminal plates 13, 13 are disposed so as to be in surface contact with the electrode sprayed surfaces 12, 12, and upper surfaces of the electrode terminal plates 13, 13 are provided. And the electrode sprayed surfaces 12, 12 beyond the electrode ends 13a, 13a.
Metal conductor coatings 14 and 1
4, the electrode sprayed surfaces 12, 12 and the electrode terminal plate 13,
13 are fixed in a surface contact state. In this case, the electrode end portions 13a of the electrode terminal plates 13, 13 are tapered, and the metal conductor films 14, 14 extending from the upper surfaces of the electrode terminal plates 13, 13 to the upper surfaces of the electrode sprayed surfaces 12, 12 are formed. Even at the electrode end portions 13a, 13a, even welding is performed without any step, and the surface contact strength between the electrode sprayed surfaces 12, 12 and the electrode terminal plates 13, 13 is increased.

Further, a plurality of tapered holes 13b are provided in the central surface portions of the electrode terminal plates 13, 13 which are in surface contact with the electrode sprayed surfaces 12, 12, and the metal conductor films 14, 14 are passed through the tapered holes 13b. Are connected to the electrode sprayed surfaces 12, 12 by spraying, so that the electrode sprayed surfaces 12, 1 are connected.
2 and the metal conductor films 14, 14 are joined together, and the surface contact strength between the electrode sprayed surfaces 12, 12 and the electrode terminal plates 13, 13 is increased.

Further, the metal conductor film 14, 14 is sprayed by spraying through the tapered holes 13b of the electrode terminal plates 13, 13.
Numeral 14 is bonded to the electrode sprayed surfaces 12, 12, and since the bonding portion is a hole, thermal stress due to spraying is dispersed, and the electrode sprayed surfaces 12, 12 of the honeycomb-shaped conductive sintered body 10 are dispersed.
Prevent damage.

In order to fix the electrode terminal plates 13, 13 to the electrode sprayed surfaces 12, another fixing tool is provided by fixing the electrode terminal plates 13, 13 with claw-shaped fixing portions 13 c provided on the sides of the electrode terminal plates 13, 13. Thus, the metal conductor films 14, 14 can be thermally sprayed without being temporarily fixed, and the mounting strength of the electrode terminal plates 13, 13 can be improved.

In FIG. 1, reference numeral 15 denotes an air passage for blowing hot air to the honeycomb-shaped conductive sintered body 10 by a fan 17 driven by a motor 16; Since the electrode terminal plates 13 and 13 are integrally formed on the body 10, the mounting of the electrode portions and the connection configuration can be simplified.

[0016]

As described above, according to the electrode of the conductive sintered body of the present invention, the bonding strength between the electrode and the conductive sintered body is improved and the contact resistance is reduced as compared with the normal electrode structure. Thus, it is possible to provide an electrode of a conductive sintered body that can perform more stable joining and has a simplified structure of the electrode portion and reduced cost.

[Brief description of the drawings]

FIG. 1 is a partially exploded perspective view of a hot air generator using an electrode of a conductive sintered body according to an embodiment of the present invention.

FIG. 2 is an enlarged perspective view of an electrode of a conductive sintered body according to the embodiment of the present invention.

FIG. 3 is a partial cross-sectional view taken along line AA of FIG. 2;

FIG. 4 is a partially exploded perspective view of a conventional hot air generator using a ceramic heater.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1,10 Honeycomb-shaped electrically conductive sintered body 2,11 Both end surfaces 3 Plane electrode 4 Conductive sheet 5,13 Electrode terminal plate 6 Spring 7,15 Blast path 8,16 Motor 9,17 Fan 12 Electrode sprayed surface 13a Electrode Extreme part 13b Tapered hole 13c Claw-shaped fixing part 14 Metal conductor film

Claims (4)

[Claims] 1. An electrode terminal plate provided in surface contact with electrode sprayed surfaces formed on both side end surfaces of a conductive sintered body is fixed by a metal conductor film formed on the electrode terminal plate by thermal spraying. Electrode of conductive sintered body. 2. The conductive sintered body according to claim 1, wherein an electrode end portion of the electrode terminal plate disposed so as to be in surface contact with the electrode sprayed surfaces formed on both side end surfaces of the conductive sintered body is tapered. Body electrodes. 3. A tapered hole is provided in a central surface portion of an electrode terminal plate disposed so as to be in surface contact with electrode sprayed surfaces formed on both side end surfaces of a conductive sintered body, and is sprayed through the tapered hole. The electrode of the conductive sintered body according to claim 1, wherein the electrode sprayed surface and the electrode terminal plate are connected by the formed metal conductor film. 4. The electrode of a conductive sintered body according to claim 1, wherein the electrode terminal plate is fixed to the electrode sprayed surface by a claw-shaped fixing portion provided on a side of the electrode terminal plate.