JPS58143513A - Laminated ceramic condenser - 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 The present invention relates to a multilayer ceramic capacitor having base metal electrodes.

In recent years, with the development of electronics, the miniaturization of electronic components has progressed steadily. In the case of ceramic capacitors, electrodes are printed on green sheets, and the green sheets are layered to form a laminate so that the electrodes are alternately exposed on the end faces and face each other, and the laminate is bonded under heat and placed in air. The trend towards miniaturization of so-called multilayer capacitors, which are obtained by methods such as firing at 1,200 to 1,400 tons, is progressing. However, since the electrodes of the loading dock condenser tube are fired simultaneously with the dielectric porcelain, they must be made of a metal that does not react with the porcelain material and does not oxidize at high temperatures of 1200 to 1400°C. Platinum, babdium, and an alloy of both have been used as metals that meet these conditions, but these metals are extremely expensive and are a major obstacle to widespread use of multilayer capacitors. Become a friend.

As an alternative to such expensive electrical materials, a method has been proposed in which the use of expensive metals such as steel metal electrodes has been proposed.1 These electrode metals oxidize when fired in air. However, when firing in a reducing atmosphere, conventional barium titanate bioelectric porcelain materials become semiconducting, resulting in problems such as insulation resistance, dielectric loss, etc. The disadvantage is that the electrical properties of the capacitor deteriorate severely, making it impossible to use it as a capacitor.

The present invention eliminates these drawbacks and provides a ceramic condensate having base metal electrodes, which immediately exhibits ft* electrical properties even when fired in a reducing atmosphere.

The present invention will be explained below with reference to Examples.

Barium carbonate, strontium carbonate, titanium oxide, #1
Zirconium oxide, chromium oxide, saponified vanadium, manganese oxide, tin oxide, etc. No. 1111
The composition was blended to have a composition shown in K, mixed for 16 hours, and then dried. This mixed raw material was placed in the air for 10
Calcined for 2 hours at sO~1200t, then wet-pulverized, then dried.

An organic binder was added to this powder, and it was granulated and molded to a thickness of 10 mm and a thickness of 018 mt. Small (1000 ppm or less) neutral (e.g. N, medium) or reducing atmosphere (Ng/H
t-10010~90/10) middle 1800~1400
t", keep it open at 2 o'clock, let it cool naturally, stop the gas input below IIO, and turn the fired body into wXX Idetomo.

Show the electrical characteristics of the dielectric porcelain having nine Ni electrodes obtained in this way, and show the results in Table 11!1.

The electrostatic capacity (Cap) and dielectric loss (mJ) in Table 1 are I
Vrms*IKHs is Om, insulation resistance (IR) is 5°V
, DC! , respectively, showed a constant value after application for 1 minute.

'& O, Keichu's sample number KO mark is attached and the good one is the present invention 0
(It is outside of III), and all other works are within Reimeihanen. It can be seen that the material according to the present invention can be formed in a neutral or reducing atmosphere, and can immediately obtain superior electrical characteristics.

＃＃１”lO＠＠＄ l ah＠＠ l Hoe l
NQ c′! NNN ga town se ~he dormitory hehe~he package 00
C5d o ci o o ci (50ci c:;
ci c5 ci ci::::::::”::::
:::: The reasons for limiting the composition range in the present invention are as follows. That is, Muyite (Ba” ion) and B site (
If the ratio (A/B) of Ti4''' ions is less than 1.00, it will be reduced and the insulation resistance will drop sharply.

When X exceeds 0.4, trench 9 y does not sinter when it exceeds 0.3. SaraKMnb Or%Snb Vb Mg
Insulation resistance decreases when ζn metals or metals other than their compounds or their compounds are added * 1 for Mn s Cr, ■, and Sn
．． If it exceeds 0 wt%, not only will fusion of &a noodles occur, but also the insulation resistance will decrease. On the other hand, Mg has 1. This is because if the content exceeds Owt%, sintering will not occur. In addition, in the lottery, N
As a result of analyzing the cross section using an X-ray microanalyzer using the 1-electrode paste, it was found that there was no diffusion of N1 into the porcelain, and furthermore, as electrodes other than the N1 electrode base, W%
Similar results have been obtained using Mo.

In the case of the Nil paste of the present invention as an electrode, the insulation resistance is 1011 or more and -1 is 2.0% or less.
Even better dielectric properties can be obtained.

As described above, according to the present invention, excellent electrical properties can be obtained even when fired in a neutral or reducing atmosphere. Electrically converts cheap and base metal materials such as Shitomo Katsuki and Tenizukeru
Since it is used in the production of ceramic capacitors, it has a significant industrial effect by significantly reducing the manufacturing cost of ceramic capacitors.

Claims (1)

[Claims] General formula (Bad-mart)
) In B+iwt%M, violet, 7% A/B% zs
A multilayer ceramic capacitor characterized in that a base metal electrode is formed on a dielectric ceramic in which M is in the following range. 0<x≦0.4 0≦y≦0.31.
00<A/B≦1.05 0<z≦1,0M-Mls
Cr%V% M118”%In, Wtv oxide