JPS6318698A - Manufacture of laminated ceramic electronic parts - Google Patents

Abstract

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

Description

[Detailed Description of the Invention] [Objective of the Invention] (Industrial Field of Application) The present invention relates to a method for manufacturing a 1 m ceramic electronic component, and more specifically, to a multilayer capacitor using a tetraelectric oxide as an internal electrode. The present invention relates to a method for manufacturing a laminated actuator.

(Prior art) Ceramic cage parts have been developed to have a laminated structure due to the demand for small J and high performance.In parts with this structure, the electrode area increases and the ratio of the material to the part cost is reduced. is increasing.

Conventionally, the method for manufacturing laminated ceramic electronic components has been to print dielectric sheets prepared by the doctor blade method I or noble metal pastes such as Ag, laminate them, and fire them.

Another method is to insert a material that disappears by evaporation and sublimation during firing of dielectric ceramics into the dielectric, and then impregnate it with metallic lead after firing to form electrodes.
The manufacturing process becomes complicated and is not effective.

(Problems to be Solved by the Invention) As described above, in the conventional technology, noble metals are used for electrode materials, which are not only expensive, but also metals used for electrode materials, resulting in heat dissipation caused by dielectric ceramics. Due to expansion and mismatching of elastic constants, the strength of the parts decreased, and there were problems in particular with the bondability at the interface between the electrode and the dielectric.

[Structure of the invention]

(Means and effects for solving the problem) The present inventors
In order to solve the problems in the above-mentioned conventional technology and achieve the purpose of the present invention, as a result of repeated research on the reduction amount, it was found that a B a P b O type material having the same perovskite structure as the dielectric material was used as the electrode material. The inventors discovered that it is possible to obtain better laminated ceramic electronic components using this method, and developed the method of the present invention.

That is, the manufacturing method of the present invention uses a dielectric material containing Pb (P b+
-xAx) BOs and conductive oxide (Bai -uDu) (Pb, -vEv) Os
This manufacturing method is characterized in that each of the above is made into a sheet by a doctor blade method, an fR layer is formed, and the sheet is obtained by simultaneous firing.

The inventors have found that when various sheets having the above compositions were prepared, laminated and fired simultaneously, the diffusion and evaporation phenomena of lead oxide contained in both sheets occurred violently. Therefore, by inserting a sheet of lead oxide between the dielectric and the conductor, it is possible to compensate for the decrease in lead oxide that occurs during firing. In this case, it is effective that the thickness t of the lead oxide sheet satisfies 0.058≦t≦0.55, where S is the thickness of the conductor sheet.

If the thickness of the lead oxide sheet is greater than 0.055 mm, it will not be possible to sufficiently compensate for the decrease in lead oxide during firing. If the thickness is greater than 0.55, a layer made of lead oxide will remain between the dielectric layer and the conductive layer after firing, significantly deteriorating its characteristics.

In particular, it is particularly effective to insert a lead oxide sheet having a thickness of 0.2S≦t≦0.4S.

Furthermore, it is possible to compensate for the decrease in lead oxide during firing by making the composition of the dielectric and the tetraelectric sheet excessive in lead oxide.

(Example) Example 1 As shown in Table 1, the dielectric material and the conductive material were adjusted to have the same composition.
This, the raw materials PbO, BaC0,, 5rCO,, CaC0
,.

La, O,, Nd2O3, B110. , Sb, 0.
,ZrO,,Tie,.

Nb, O, , MgO, SnO, , Coco, , NiO
, WOs, Fe, 0. .

Li, CO, CeO, and ZnO were weighed and mixed, and ground and mixed in pure water using a bottled hole. After drying, the dielectric was calcined in air at 900°C for 3 hours and the conductor was calcined in an oxygen flow for 3 hours at 900°C. These were ground again in pure water using a ball and pot and dried.

A binder was added to these powders, polyvinyl butyral was added, and a sheet was prepared using a doctor blade method. These and lead oxide sheets were laminated and heated for 1000 minutes in an oxygen flow.
It was baked at ℃ for 3 hours.

No blistering or cracking was observed in the fired ceramic parts shown in Table 1. Also, do not perform a three-point bending test on the resulting parts. As a result, no parts were broken at the interface between the dielectric and the conductor.

In the same manner as in Example 1, P bo4c aO,2Tio
, s F etxs O3 powder and B a P b, O
After creating x powders, each powder has an it ratio of 20
% of PbO powder was added, the mixture was crushed and mixed in pure water, and then dried to form a sheet of 40 capes using a doctor blade method.

Ten dielectric sheets were laminated, five conductive sheets were laminated, and these were alternately laminated to create a 50-layer laminate. This was calcined in an oxygen flow at 1000° C. for 3 hours in a furnace increasing the temperature at a rate of 50° C./hr.

As a result, there was no fracture at the interface.

C. Effects of the Invention] As detailed above, according to the present invention, a multilayer ceramic electronic component in which the conductors of the dielectric seven internal electrodes have good matching can be obtained at low cost.

Representative patent attorney Kensuke Chika Same Bamboo Flower Kikuo

Claims (1)

[Scope of Claims] (1) A laminated ceramic electronic component in which the internal electrodes are made of a conductive oxide, which is obtained by laminating dielectric and conductive sheets prepared by a doctor blade method and co-firing the laminated ceramic electronic component. Method of manufacturing ceramic electronic components. (2) The composition of the dielectric is (Pb_1_-_xA_x)BO_3 [where A is Ba, Br, Ca, La, Nd, Bi,
At least one B selected from the group of Sb is Zr, Ti, Sb, Nb, Mg, Sn, Co, Ni
, W, FeTa, and Y. 0≦x≦0.30] The method for manufacturing a dielectric ceramic electronic component according to claim 1, wherein (3) The conductor has a composition of (Ba_1_-_uD_u) (Pb_1_-_vE_v
) O_3 [However, D is at least one type selected from Li, La, and Ce B is at least one type selected from Sn, Zn, Fe, Co, Sb, and Bi 0≦u≦0.3, 0≦v≦0 .3] The method for manufacturing a multilayer ceramic electronic component according to claim 1, characterized in that: (4) The multilayer ceramic electronic component according to claims 2 and 3, characterized in that a lead oxide sheet is inserted between the dielectric and conductor sheets when the sheets are laminated. Production method. (5) The multilayer ceramic electronic according to claim 4, wherein the thickness t of the lead oxide sheet is 0.05s≦t≦0.55, where the thickness s of the conductive sheet is 0.05s≦t≦0.55. How the parts are manufactured.