JPS60153103A - Method of producing zinc oxide nonlinear resistor - 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] 〔Technical field〕 The present invention relates to a method for manufacturing a zinc oxide nonlinear resistor.

[Prior art and problems]

Generally, zinc oxide nonlinear resistor (hereinafter referred to as Z, O element)
For example, a device with a complex formulation of BHOIl as the main additive and several other metal oxides is used. In order to improve the durability of Nippon's elements, a heat treatment process of 400°C to 900°C is applied to the insulating coating on the outer periphery of the element. There is a drawback that the sound quality decreases considerably. The reason for this property deterioration is that the B, O, crystal structure changes due to heat treatment. In addition, the above element has a certain current range (usually 10
The nonlinear characteristic at 0μA-LA) is its nonlinearity index (α)
is 20 or more, but if it is less than or more than 20, there is a drawback that the characteristics are extremely deteriorated. Furthermore, the main additive B,, o, is B, and the Clarke number of the element is 2 x 10-'
and lack of resources.

[Purpose of the invention]

It is an object of the present invention to provide a method for manufacturing a zinc oxide nonlinear resistor that eliminates the above-mentioned drawbacks, prevents deterioration of nonlinear characteristics due to heat treatment, and reduces leakage current even when electricity is applied. purpose.

[Summary of the invention]

In order to achieve the above-mentioned objective t--, this invention has been developed in advance by using PbO
* sb, o, 'fl'' Powder heat-treated at 800 to 1100°C, Z, 0, Mho@ + 5bIlo,
l a, , O, and l are mixed together with zinc silicate glass powder, pressure molded, and the molded product is heat-treated.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

First, Pb O + sb, O,, t - molar ratio of 2:1
A predetermined amount was weighed out at a ratio of 1,000,000 and mixed well in a centrifugal ball mill, and after death, calcining was performed at 1000° C. for 4 hours in an alumina crucible. The calcined powder calcined in this way is pre-mo1%
Weigh a predetermined amount of 0.2 wt% of zinc borosilicate glass, add 2% by weight of the reaction product No. 11 to these, mix these powders well, and press-form them into a disk shape. After that, the molded body was fired in air at 1100°C for 6 hours,
Both end surfaces of the molded body were polished, coated with A1 electrolyte, and heated to 590°C.
, a complete heat treatment of 1 hour is carried out.

FIG. 1 is a characteristic diagram showing the voltage-current characteristics of the 2.0 element manufactured according to the above embodiment and the voltage-current characteristics of a 2°og element made of zinc silicate glass at a power of 1-17. Curve A is for this example, and curve B is for the latter element. As is clear from FIG. 41, the non-linear characteristics in the current domain are not extremely sensitive to V. However, in the latter case, the nonlinear characteristics are extremely arbitrary, as described in the prior art.

Figure 2 shows #1 when varying amounts of zinc silicate glass were added. , 1α21. value (current is 0.1.A and 1.Om
Curve A showing the non-linear index) ft between A and V1mA/□,
FIG. 3 is a characteristic diagram of curve B showing changes in .

Figure 3 shows the leakage current If when a DC voltage of 85 cm of VlmA is applied in a constant temperature chamber at iso°C. In this characteristic diagram, the straight line A in the figure is for this example, and the straight line B is for the element without zinc borosilicate glass added.

As is clear from FIGS. 1 to 3 above, the resistor manufactured according to the present embodiment has superior non-lk line characteristics and life characteristics compared to elements to which zinc borosilicate glass is not added. In addition, the heat treatment temperature of the sintered body is preferably 500°C to 850°C,
Below this temperature, the life characteristics will not improve, and above 850° C., the nonlinear characteristics will deteriorate. Furthermore, the heat treatment time varies depending on the size of the element, but is preferably 1 hour or more, and the rate of temperature increase and cooling is set at a rate of 2 to 300 degrees so that the element is not strained by rapid heating or cooling.
00°C/hour or less is preferable. In addition, the firing temperature is 1000
A temperature of ~1800°C is good, and if it is lower than that, a dense sintered body will not be obtained, and if it is higher than 1800°C, pbo will volatilize and the nonlinearity will deteriorate. The firing time is preferably 1 to 20 hours, but a uniform sintered body cannot be obtained within 1 hour. After 20 hours or more, 1'% O and SbgOs volatilization near the surface cannot be ignored.

From the above results, the range of each additive component in the OX child fragmentation method is PH, O, and the 5blOs reactant is (12 to 20
wt Chi, JillO, is 111~5mo1% +5b
9011 is (ll~5mol%.

'c,,olI is Q, 1 to 5 m o 1%, and zinc silicate glass is preferably 0.01 to 5 wt. If it is less than this range, no effect will be seen, and if it is more than this range, nonlinearity will decrease. do.

In the above embodiments, a centrifugal ball mill, an alumina crucible, etc. tt' were used, but other types of these may be used.

〔Effect of the invention〕

As described above, according to the present invention, the crystal structure does not change even through heat treatment, so the nonlinear characteristics do not deteriorate, and the nonlinear characteristics are high due to the chain acid with a small current of 10 μA. There is little leakage current even when power is applied, and there is little increase in leakage current due to r#JJVc when power is applied, so durability is remarkable. Itoko's (B
+ Clark number 2; PbO compared to (10-6)
(Clark number of Pb: 1.5 x 10゛-'') is used, so it has the advantage of being abundant in °C as a resource.

[Brief explanation of drawings]

Figure 1 shows 2 manufactured according to an embodiment of this invention.
0 element 1 pressure 71L flow characteristics and #1 zinc silicate glass Z that does not paint. Figure 2 is a voltage-current characteristic diagram of an O element, and a characteristic diagram showing changes in the nonlinear index and v, mA/'a ll+ when zinc silicate glass is added.
Figure 8 is a characteristic diagram showing the relationship between the sag and the rate of increase in current capacity by 1 when a DC voltage of 85% of V, . . . , A is applied in a constant temperature oven.

Claims (1)

[Claims] A method for manufacturing a zinc oxide nonlinear resistor, which is patented by adding zinc oxide to glass, mixing it, one-press molding, and heat-treating the molded product. (2) The PbO, Sb, OH reactants are 0.2 to 2
gwt%, M, O, (i) 0.1 to 5 mo1%, S
b, O,1 (11 to 5mol%, a,, allIg,
The zinc oxide nonlinear resistor according to claim 1, characterized in that 1 to 5 mo1% of the hood and zinc borosilicate glass are added to 0.01 to 5 Wt. Production method. (3) The ratio of R0, 84,0, is 2:1 in molar ratio
Claim 1, in which the reactant is 2:1.5
The method for manufacturing the zinc oxide nonlinear resistor described in Section 1.