JPH0536565A - Internal-electrode material for laminated component contining lead - Google Patents

Abstract

PURPOSE:To obtain an electrode material for a laminated ceramic capacitor, a piezoelectric laminated component and other laminated components which are constituted of a ceramic containing lead and of an electrode material. CONSTITUTION:An internal electrode for a ceramic laminated component containing lead is constituted so as to contain the following: one or two or more kinds of metals or alloys out of Ag, Pd, Ni and Cu; and at least one kind out of Al2O3 and SiO2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrode material for a laminated ceramic capacitor, a piezoelectric laminated component or other laminated components which is composed of a lead-containing ceramic (derivative material) and an electrode material.

[0002]

2. Description of the Related Art Conventionally, Ag / Pd electrode materials have been generally used as internal electrode materials in the manufacture of multilayer ceramic parts such as multilayer ceramic capacitors and multilayer piezoelectric actuators.

[0003]

By the way, in the above-mentioned conventional multilayer ceramic parts, a ceramic containing lead is used. However, Ag / Pd is used as an internal electrode material capable of low temperature firing at around 1100 ° C. Has been used,
Cost reduction is achieved as compared with the Pd electrode.

However, this is because the presence of the lead-excessive phase at the grain boundaries of the ceramic composition and the electrode interface causes a large deterioration of the insulation resistance, and the Ag resistance in the moisture resistance test and the like.
However, there is a problem in that the utility is poor.

Therefore, it is an object of the present invention to provide an internal electrode material for a ceramic laminated component for the purpose of solving the problem of moisture resistance of the laminated component containing lead and improving the electrical characteristics. .

[0006]

In order to achieve the above object, in the present invention, one or more kinds of metals, alloys of Ag, Pd, Ni and Cu are used as internal electrodes in a ceramic laminated component containing lead. It contains at least one of Al ₂ O ₃ and SiO ₂ .

[0007]

[Function] Ceramic dielectric material for laminated ceramic parts,
The piezoelectric material is usually composed mainly of an oxide material, and firing is performed under the condition that the internal electrode material is not oxidized. A for use in lead-containing multilayer ceramic components, as in the present invention.
By using the internal electrode material containing 1 ₂ O ₃ and SiO ₂ , the internal electrode material is partially sintered with the ceramic, and the bonding is likely to proceed at the interface between the internal electrode material and the ceramic, and the excess of the electrode near the electrode Of PbO, which prevents the formation of a PbO-excess phase, which is one of the causes of the deterioration of the moisture resistance. As a result, it becomes easy to manufacture a highly reliable laminated ceramic component such as improved moisture resistance or breakdown voltage.

[0008]

EXAMPLE An example of the present invention will be described. As a monolithic ceramic component, a monolithic ceramic containing lead and a monolithic ceramic capacitor having an internal electrode having a composition ratio of Ag80-Pd20 therein are described.
The electrical characteristics and moisture resistance were evaluated according to the l ₂ O ₃ content.

The electrode material is Ag of 0.5 to 1.0 μm.
Powder, 0.1 μm Pd powder, and about 0.06 μm Al ₂ O ₃ powder were mixed with an organic vehicle, thoroughly kneaded, and prepared as a paste. Table 1 shows the paste sample numbers and respective composition ratios, particularly those obtained by adding 0 to 10 parts by weight of Al ₂ O ₃ .

[0010]

[Table 1]

On the other hand, P having a perovskite crystal structure
Pb (Mg1 / 3 ・ Nb2 / as bO ceramic powder
₃₎ O 3 -PbTiO 3 system ceramic paste is adjusted with an organic vehicle in the green sheet of about 30μm and the electrode paste shown in Table 1 thereon by screen printing, of 500 kg / cm ² 35 ply by After pressing under the conditions and cutting, it was fired at 1000 ° C. to 1060 ° C. for 4 hours in the atmosphere. The firing temperature has an average initial capacitance of 3.0 to
It was adjusted to be 3.5 μF.

Ag and PbO-Al ₂ O are added to the base material after firing.
₃ terminal electrode and the glass consisting -SiO ₂ containing 5 parts by baking the coating after drying 700 ° C. in air to obtain a sample for evaluation.

Capacitance (μF), tan δ (max,%),
Table 2 shows the initial electrical characteristics such as 25 VIR (insulation resistance, min) and breakdown voltage (V, min) measured for the sample number n = 30. Also, 121 ° C, humidity (R
H) 100%, 2 atm, 25 V load 100 hours after, the moisture resistance evaluation results were measured for the sump number n = 15.

[0014]

[Table 2]

[0015]

[Table 3]

Al ₂ O ₃ is 0.5 in the samples Nos. ₂ to 5.
It can be seen that the breakdown voltage tends to be high in the laminated ceramic capacitor using the internal electrode material contained in an amount of up to 6 parts by weight.

In the moisture resistance load test of Table 3, 100
After h, it can be seen that IR deterioration did not occur in the laminated ceramic capacitor using the electrode material containing 0.5 to 6 parts by weight of Al ₂ O _{3 of} Sample Nos. ₂ to 5.

In the above description, Al ₂ O ₃ is replaced with Ag-Pd.
Although the example in which it is contained in the electrode has been described, the similar effect is the same for SiO ₂ and one or more kinds of Ag, Pd, Ni and Cu.
Any substance that reacts with bO and crystallizes can be used.

[0019]

As described above, according to the present invention, Al _{2 is} used as the internal electrode material of lead-containing multilayer ceramic parts.
By containing O ₃ and SiO ₂ , conventional Ag-P
It is possible to provide a multilayer ceramic component having excellent reliability such as an improvement in breakdown voltage and an improvement in moisture resistance as compared with the internal electrode having only d.

Continued front page    (72) Inventor Nobuo Kaihara             1-13-1, Nihonbashi, Chuo-ku, Tokyo             -DAI Co., Ltd. (72) Inventor Kouki Ito             1-13-1, Nihonbashi, Chuo-ku, Tokyo             -DAI Co., Ltd.

Claims (4)

[Claims] 1. In an internal electrode of a ceramic laminated component containing lead, one kind or two or more kinds of metals or alloys of Ag, Pd, Ni and Cu and at least one kind of Al ₂ O ₃ and SiO ₂ are used. An internal electrode material for a laminated component containing lead, which is characterized by containing. 2. The electrode material is metal powder, alloy powder,
The internal electrode material for a lead-containing laminated component according to claim 1, which is composed of a paste composed of an oxide powder, an oxide powder and Al ₂ O ₃ , SiO ₂ powder, or a coprecipitated powder. 3. The electrode material is Al ₂ O ₃ , SiO ₂
At least one of 0.
The internal electrode material for a lead-containing laminated component according to claim 1, wherein the internal electrode material is contained in an amount of 5 to 6 parts by weight. 4. The internal electrode material for a lead-containing laminated component according to claim 1, wherein the Al ₂ O ₃ and SiO ₂ are contained as an organic metal.