JPH04280601A - Ptc-ntc integrated element and manufacture thereof - Google Patents

Abstract

PURPOSE:To obtain a single structure PTC-NTC integrated element. CONSTITUTION:The title PTC-NTC integrated element 1 is formed by integrating a PTC element 2 mainly composed of V2O3, an NTC element 3 mainly composed of V2O3 and electrode 4, 5 and 6 in laminated layer state. The positive and negative resistance temperature characteristics can be properly displayed by a single structure using the above-mentioned constitution.

Description

[Detailed description of the invention]

[Purpose of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a PTC/NTC integrated device and a method for manufacturing the same.

0002

[Prior Art] Conventionally, a PTC having a positive resistance-temperature characteristic
(Positive Temperature Coe
NTC (Nagatve Temperature C) element with a negative temperature coefficient of resistance
Attempts have been made to integrate these elements. By integrating both elements, positive and
This is because by realizing one current control element having negative resistance-temperature characteristics, space can be saved and the circuit configuration can be simplified compared to the case where both of these elements are used individually.

0003

[Problems to be Solved by the Invention] However, in the past, although it was possible to simply mechanically join and integrate a PTC element and an NTC element, it was impossible to integrate them to include electrodes. It was possible. That is, P.T.
C elements and NTC elements usually have different compositions, and
Since the electrodes are also made of materials different from those of these two elements, their coefficients of thermal expansion are different.Furthermore, the baking conditions for the electrodes are also different between the PTC element and the NTC element, resulting in
It has been impossible to integrate the TC element and the NTC element while maintaining their respective resistance-temperature characteristics appropriately.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a PTC/NTC integrated element and a method for manufacturing the same, which can appropriately exhibit their respective resistance-temperature characteristics.

[Configuration of the invention]

[0006]

[Means for solving the problem] The PTC according to claim 1.
The NTC integrated element is a PT whose main component is V2 O3.
A C element, an NTC element mainly composed of V2O3, and an electrode are integrated in a laminated state.

[0007] The manufacturing method according to claim 2 provides V2 O3
The process includes a step of manufacturing a PTC element and an NTC element each having as a main component, and a step of integrating the manufactured elements and electrodes into a laminated state using a bonding material.

[0008] The manufacturing method according to claim 3 provides V2 O3
A step of obtaining a PTC element and an NTC element from raw materials containing as the main component and adding 1 to 10% by weight of high melting point metal powder, respectively;
The method includes a step of arranging electrodes containing the same components as the high melting point metal powder between the two elements and on both end faces so that these are stacked, and firing and integrating the electrodes.

[0009]

[Operation] According to the PTC/NTC integrated element according to claim 1, the PTC and NTC elements share V2 O3 as a main component.
Since the element, NTC element, and electrode are integrated in a laminated state, it is possible to exhibit positive and negative resistance-temperature characteristics, respectively, although it is a single structure.

According to the manufacturing method according to claim 2, V2
The above-mentioned effect can be achieved through a simple process in which a PTC element and an NTC element, each containing O3 as a main component, are manufactured separately, and these elements and electrodes are sequentially bonded using a bonding material to form a laminated state. A PTC/NTC integrated element can be obtained.

According to the manufacturing method according to claim 3, V2
Main component is O3, 1 to 10% by weight of high melting point metal powder
A PTC element and an NTC element were manufactured from the added raw materials, and a total of three electrodes containing the same components as the high melting point metal powder were placed between these elements and on each end face, and the whole was laminated. After that, by firing these, each electrode and P
The TC element, each electrode, and the NTC element are joined by the fusion action of the high melting point metal powder, thereby obtaining a PTC/NTC integrated element that exhibits the above-mentioned effects.

0012

EXAMPLES Examples of the present invention will be described in detail below.

[0013] The PTC/NTC integrated element 1 shown in Fig. 1 has a plate-shaped plate made of tungsten or molybdenum between a PTC element 2 and an NTC element 3 which are formed in the shape of a rectangular parallelepiped of the same size and whose main component is V2O3. The first electrode 4 formed in
At the same time, plate-shaped second and third electrodes 5 and 6 made of tungsten or molybdenum are placed on the end surface (upper surface) side of the PTC element 2 and the end surface (lower surface) side of the NTC element 3, respectively. It has an integrated structure in a laminated state.

Next, a method of manufacturing the PTC/NTC integrated element 1 will be explained with reference to FIGS. 2 to 4.

First, PTC elements 2 and N shown in FIGS.
The manufacturing process of the TC element 3 will be explained.

Both the PTC element 2 and the NTC element 3 are formed of an oxide material represented by the chemical formula (Crx V1-x)2 O3.

That is, first, V2 O3 and C are used as raw materials.
r2 O3 in a predetermined ratio, and a rare earth oxide or a metal element such as Fe or Sn is added as a firing aid. In this case, it is important to use an alkoxide as a starting material for V and Cr and hydrolyze it to form vanadium oxide in a predetermined ratio in order to obtain a compositionally uniform raw material.

The oxide material is synthesized in this manner and fired in a normal hydrogen atmosphere at a temperature of 1300° C. to 1500° C. to produce a PTC element 2 and an NTC element 3.

The PTC element 2 is made of an oxide raw material (Cr
For example, if x of x V1-x )2 O3 is 0.002
For example, as the NTC element 3, one in which x is set to 0.01 to 0.02 is used.

Next, as shown in FIG. 4, the PTC element 2 and the second electrode 5 are arranged on the upper surface side of the end of the first electrode 4 with the first electrode 4 in the middle. By arranging the NTC element 3 and the third electrode 6 on the lower surface side of the end of the first electrode 4, and further joining these bonding regions by silver brazing in hydrogen or vacuum, the structure shown in FIG. Indicated PTC・NT
A C-integrated element 1 can be obtained. Note that the first electrode 4
The protruding direction of the electrode 5 and the protruding direction of the second and third electrodes 5 and 6 are opposite to each other to facilitate wiring connections and the like.

[0021] PTC obtained through such a simple process
According to the NTC integrated element 1, although it has a single configuration, the PTC element 2 and the NTC element 3 have the same main component, and the positive resistance temperature characteristic due to the PTC element 2 and the N
It becomes possible to appropriately exhibit the negative resistance-temperature characteristics of the TC element 3.

Next, a method for manufacturing a PTC/NTC integrated element 1A having a slightly different composition from the above-described case will be described with reference to FIGS. 5 and 6.

[0023] Using raw material powder in which 1 to 10% by weight of high melting point metal powder such as tungsten or molybdenum is added to the oxide material described above, these are pressed at a predetermined pressure to form PT.
A C element 2A and an NTC element 3A are each manufactured, and both elements 2A and 3A are combined with a first one made of tungsten or molybdenum.
As shown in FIG. 5, the third electrodes 4 to 6 are pressed and stacked in the same order as in FIG. Next, as shown in FIG. 6, this pressed stacked state is placed in a furnace 7, and
Firing is performed at a temperature of 0.000 to 1700° C. in a hydrogen atmosphere. During this firing process, PTC element 2A, NTC element 3
A fusion action of the tungsten or molybdenum metal powder contained in A occurs, and as a result, each of the electrodes 4 to 6 is tightly joined to the PTC element 2A or NTC element 3A, respectively, and the whole is integrated. PTC・N shown in Figure 1
A TC integrated element 1 can be obtained.

In addition to the above-described case, the PTC/NTC integrated element 1 can also be obtained by making the high melting point metal powder into a paste, applying it to each bonding area, and firing.

Furthermore, as mentioned above, the PTC elements 2A, N
In order to avoid the adverse effects of heat during these operations due to the integration of the TC element 3A, it is necessary to shift the operating temperature of the PTC element 3A to a higher temperature side or to provide heat shielding using a heat insulating material. Just do it like this.

In addition to the embodiments described above, the present invention can be modified in various ways within the scope of its gist.

For example, in the above-mentioned embodiment, a case was explained in which a PTC element and an NTC element were integrated one by one, but it is also possible to integrate a larger number of these elements, such as three or four, in a laminated state. By having such a multilayer structure, PT with various ratings can be used.
A C/NTC integrated device can be provided.

[0028]

[Effects of the Invention] According to the present invention described in detail above, the following effects are achieved.

According to the invention set forth in claim 1, by having the above-described structure, it is possible to provide a PTC/NTC integrated element that properly exhibits both positive and negative resistance temperature characteristics despite having a single structure. can do.

According to the second aspect of the invention, it is possible to provide a manufacturing method capable of manufacturing a PTC/NTC integrated element that exhibits the above-mentioned effects through simple structural steps.

[0031] According to the third aspect of the invention, the PTC element and the NTC element and the electrode material composition are made common, so that the PTC element and the NTC element can achieve the above-mentioned effects by simultaneous firing.
A manufacturing method capable of manufacturing an NTC integrated element can be provided.

[Brief explanation of the drawing]

[Fig. 1] Side view showing a PTC/NTC integrated element that is an embodiment of the present invention.

[Figure 2] Perspective view of the PTC element same as above

[Figure 3] Perspective view of the NTC element same as above

[Figure 4] A perspective view showing the manufacturing process of the PTC/NTC integrated element shown in Figure 1.

[Fig. 5] A perspective view showing another manufacturing process of the PTC/NTC integrated element shown in Fig. 1.

[Fig. 6] A perspective view showing another manufacturing process of the PTC/NTC integrated element shown in Fig. 1.

[Explanation of symbols]

1 PTC/NTC integrated element 2 PTC element 2A PTC element 3 NTC element 3A NTC element 4 First electrode 5 Second electrode 6 Third electrode

Claims (3)

[Claims] [Claim 1] A PTC/NT characterized in that a PTC element whose main component is V2 O3, an NTC element whose main component is V2 O3, and an electrode are integrated in a laminated state.
C integrated element. 2. A method comprising the steps of manufacturing a PTC element and an NTC element each containing V2O3 as a main component, and integrating the manufactured elements and electrodes into a laminated state using a bonding material. A method for manufacturing a PTC/NTC integrated element. 3. A step of obtaining a PTC element and an NTC element, respectively, from raw materials containing V2O3 as a main component and adding 1 to 10% by weight of high melting point metal powder; A method for manufacturing a PTC/NTC integrated element, comprising a step of arranging electrodes containing the same components as the powder so that they are stacked, and firing and integrating the electrodes.