JPS58209085A - Method of producing positive temperature coefficient porcelain heater - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Invention 14: Positive resistance temperature porcelain (P l' C) with virtually constant resistance at room temperature - Nita's Ill! I have a lot to do with people.

1st 11'L rfuf 1st part)
, the resistance changes greatly. Positive resistance temperature porcelain is used as a heater for this "L resistance horse (using the +Il trade of porcelain to heat up to a certain degree). The manufacturing method for Ichita is to sinter the Relamix raw material containing barium titanate for 1 hour to form a constant-thickness ILE low-resistance, low-temperature porcelain. One layer of ohmic film is formed, and then the second layer is baked onto a silver base film (JT:J, to form a pair of electrodes and a heater is manufactured).

The room temperature resistance of a positive resistance temperature porcelain heater has a negative effect on the output of the heater, so in order to keep the output within a limited range, the room temperature resistance of the heater must be severely controlled.
It is necessary to However, when manufacturing positive resistance temperature porcelain, it is very difficult to control the room temperature resistance to a certain value. Shilζ
Therefore, if electrodes are formed on the entire heat generating surface as in the conventional manufacturing method, the room temperature resistance of the positive resistance temperature porcelain heater is the same as the room temperature resistance of the positive resistance temperature porcelain itself, which is 4τ, which is the positive resistance given by 4r/. My office job was to keep the room temperature of the porcelain heater within a certain range of 11 degrees Celsius.

The present invention overcomes the problems described in 1-1.
By keeping in mind that the buffer 1 of the room temperature resistance of positive resistance temperature porcelain in the tsurad is relatively small, we devised the area ratio and arrangement of the ohmic contact layer of the electrode.
This makes it possible to keep the room temperature resistance of a positive resistance temperature porcelain heater substantially constant.

It is something.

1", the method for manufacturing a positive resistance temperature porcelain heater of the present invention (
, 1. Making a plate-shaped positive resistance temperature porcelain with a constant thickness ■Culm, plate-shaped 1 "The upper and lower surfaces of the resistance temperature porcelain are proportional to the normal temperature specific resistance of the positive resistance temperature porcelain 1) in diameter or width. A step of forming an island-shaped, -3- or band-shaped A-mitsuku contact layer with a change in the positive resistance Flea I porcelain. .about.Fft Jj , 1, and the steps of forming metal electrodes covering all the A-mic contact layers on the lower surface, respectively.

Manufacture of the present invention (, 11, A-Mitsukuko 299
Layers 1 to 1 are formed in the form of islands or 4; By changing the structure of the ohmic contact layer (^), the obtained 1゛resistance y = ra ra & the normal temperature resistance of the heater can be changed, and the positive resistance temperature where Ii'j is substantially constant There is a porcelain heater.

<T, the production of the present invention; 1117j French (: 10, and the forming process of cutting one layer of ohmic to a certain shape is different from the conventional manufacturing method./7 Pj, other positive resistance temperature Steps for making porcelain: 1. The process of forming the layer itself and the process of forming the metal electrodes are the same as in the past.

The plate-shaped positive resistance temperature porcelain according to the present invention has at least one pair of electrodes formed on the upper and lower surfaces of the plate-shaped positive-1-resistance temperature porcelain. For this reason, it is preferable that the porcelain be thin with a thickness T) compared to the area of the upper and lower surfaces of the positive resistance temperature porcelain.

The A-mic contact layers formed on the upper and lower surfaces of the plate-shaped positive resistance humidity porcelain are in the form of islands or bands spaced apart at regular intervals. For example, as shown in FIG. 1, FIG. 2, FIG. 3, and FIG. The island shape refers to a square shape as shown in FIG. 1, a round shape, a star shape, or the like. In addition, a linear shape means that the length is better than the width (1), so it may be a parallel straight line, a curved line, or one with an angle. As shown in FIG. 4, both island-like and linear ohmic contact layers may be included.

The shape of the plate-shaped positive resistance temperature porcelain may be circular, quadrangular or rectangular, and it may be plate-shaped with a large bottom surface area relative to its thickness. More preferably, the ratio S/T of the thickness T cm of the positive resistance temperature porcelain to the total area S cm 2 of the lower surface of the positive resistance humidity porcelain 1 is preferably 40 or more. ,.

Furthermore, L; L represents the size of the layer to the island-like A-mic contact 1, e.g. diameter 1) cIll is the thickness TOI
It is preferable that 1]/unit is 1- with respect to I+.

It is preferable that the width W Cm G;i, W//to, which represents the size of the linear Δ-mic 1-fr4, is 0.5 or more. Further, it is preferable that the distance -11-Cm between adjacent A-mic contact layers is such that l-/1- is 0.3 or more.

If all of these reasonable conditions are satisfied, the resistance value between the electrodes will be approximately inversely proportional to the total area of the layer. The total surface area of the ohmic contact layer is proportional to the resistance value at room temperature of 11℃. In particular, only the positive resistance temperature porcelain heater of 10 has a constant resistance value at room temperature.

Specifically, the first plate-shaped positive resistance temperature porcelain has a low resistance at room temperature of 104-mm, and the second plate-shaped positive resistance ffr
A Ilj &i vessel) hF nJ 1l-flu I
+'t, h< 12 ohm F Al 1, where the second plate I [resistance temperature porcelain, -f'+ - For example 1, f, linear Δ-Mitsuku 1 Inter 91 ~ The width of
2491 ~ the width of the layer], Jζ is to be doubled, the first
．． The normal temperature resistance of the positive resistance temperature porcelain made of 412 plates of 11th grade anti-temperature porcelain is almost the same.
1. It should be noted that the further out of the preferable condition -1, the greater the resistance 1f between the total area of the Δ-Mikyu contact layer and the distance between the electrodes.
fi is less likely to be inversely proportional.

Formation of the layer on the A-Mink contact layer 1 is carried out by printing, etc. a partially activated +1-containing paste on the upper and lower surfaces of the plate-shaped positive resistance temperature porcelain at the positions where the A-Mink contact layer in the form of islands or lines is to be formed. After that, a normal electroless method is applied, and nickel is plated only on the printed surface area to form an ohmic contact layer.

The metal N electrode is formed by baking, for example, silver paste 1 on the A-mink contact layer as in the conventional method. As a result, a positive resistance temperature porcelain heater in which the room temperature resistance between the electrodes is substantially constant can be obtained.

-71 Production of the present invention
Even if the resistivity at room temperature is different for each heater, the undefeatable resistivity is fixed in the electrode forming process. In addition, since the whole body is heated to an even temperature of 91% by using a heater, there is no problem of deterioration of Aq.

In addition, the room temperature resistance is controlled by the area of the A-Mitsuuni 1991~ layer and the b key is pressed! Other 1V such as temperature, maximum resistance, etc.
i f'l does not change, (brui GEL, Ill'IC which can be ignored even if it changes, so there is virtually no problem.

Below, Examples (JJ, Sui (1, Akiraru.

Fresh fLIll (+7 ('Tondo)' please! 20℃
Platy positive resistance temperature porcelains of the 80, 13o, and Go31Φ types with specific resistances of 871-ohms, 10 A-hms, and 12 ohms were prepared3.The relationship diagram between these temperatures 1a and resistance is shown in Figure 5. . J, Takore 3 f! The shape of class II +IE resistance temperature porcelain is [12+nm, 4M'I Omm, I'j
jsu 1mm size (7) teal.

Next, the low resistance temperature of Δ0 is applied to the lower surface of 1-1 with a width of 1 mm and an interval of 1 mm to the instep 1j.
Print the Il paste from Pudding 1 to No. 19.111
(Approximately 5 microfron A-Mitsukuni = 1 contact layer was formed using electrolytic nickel metal. Next, silver base 1 ~ 1 ~ was formed on the ohmic contact layer 1.
A metal electrode was formed by coating and baking at 600°C, and a positive resistance temperature porcelain heater Δ1 was manufactured. For BOJff and Co positive resistance temperature m devices, the width and spacing of the linear printing of activated base 1 ~ 1.25 mm, 0.75 + nm, and 1
．． Positive resistance temperature porcelain heaters B1 and C1 were manufactured in the same manner as A, except for 88 mm x 0.62 mm.

The humidity-resistance diagrams of these three types of positive resistance temperature porcelain heaters are also shown in FIG. FIG. 5, symbols Δ0 and Δ1 are a diagram of heater Δ1 using positive resistance temperature porcelain ΔO and Δ0, BO1B+ is a diagram of heater 1B+ using positive resistance temperature porcelain [30 and BO, CO, C+ is positive resistance temperature porcelain C
A microcosm of Nita C1 using O and CO.

As is clear from FIG. 5, the room temperature resistance of the three types of positive resistance temperature porcelain heaters Δ+, B+, and C+ was approximately constant C, approximately 16 ohms.

[Brief explanation of drawings]

-9- Fig. 1, Fig. 2, negative) Fig. 33 and Fig. 4 respectively show examples of the shape of the A-Mitsukuni 1 contact layer of the present invention. Plan view of resistance temperature porcelain, Fig. 1j It is a diagram showing the relationship. 1...11-resistance side 1α porcelain 2...A-Mick:]24911~layer 1'JW
louta person 1− =+ evening iFI+ tI −I Q
a Ceremony Representation Attorney 1- Hiroshi Okawa Attorney 1-1# Shuben Tani 1- Akio Maruyama-10- Figure 1 2 / Figure 2 (1 7 (2)

Claims (1)

[Claims] (1) The process of making plate-shaped positive resistance temperature porcelain with a constant thickness. Form an island-shaped, or band-shaped ohmic layer 1 or 2 at regular intervals, and all the ohmic layer on the soil surface of the resistor-quenching porcelain. A method for manufacturing a positive resistance temperature porcelain heater with a controlled resistance at room temperature, comprising the steps of forming and covering metal electrodes covering the first layer and all the ohmic contacts 1 on the lower surface. (2) The total area of the positive resistance temperature porcelain heater surface is 3 cm2.
J? The manufacturing method according to claim 1, wherein the ratio S/T of the thickness TCIll is 40 or more. (3〉Diameter of island-shaped ohmic contact layer 1) cm
, = 1 - Width Wcm, 4fl Ratio D/T, W/T of thickness I'cm to distance ml l-cm between adjacent A-mitsukuntak 1-layers. L-/T/J<Each of you, 0. h, 0.3 or more'': The manufacturing method according to item 1 of the scope of the request for special engineering '16^.