Thermistor high reliability in high temperature

Available in high temperature also has a thermistor element with high reliability. Thermistor element of the invention,has an inner clamping the internal electrode layers more than two thermistor layer of the element body, formed in the element the outer surface of the main body, a pair of the internal electrode layers are respectively connected to theopposite terminal electrode, and is connected to the end sub electrode terminals of, characterized by, the thermistorlayer has the expression consists of YaCabCrcAldM1eO3 oxides. The thermal resistor layer substantially does not contain Sr and Mn.

1 a thermistor, thermistor layer is sandwiched inside the internal electrode layer two or more of the element body,

Formed in the element the outer surface of the main body, the electrode layer and the internal electrode layers are respectively connected to the opposite to each other on a pair of

Terminal electrode, and a lead connected to the terminal electrode terminal, which is characterized in that,

The thermistor layer is composed of YaCabCrcAldM1eO3 expression in the oxide,

The relation between a and B type from a+b = 1 indicates,

The composition of C, D and E are related by c+d+e = 1,

At least one of the components in Co, Sn, M1 selected for Nd, Pr, Ga and Ni,

The composition of a for 0.5 ≤ a ≤ 0.99,

The composition of B for 0.01 ≤ B ≤ 0.50,

The composition of C for 0.06 ≤ C ≤ 0.64,

The composition of D for 0.01 ≤ D ≤ 0.94,

The composition of E for 0 ≤ e ≤ 0.35,

The thermistor layer substantially does not contain Sr and Mn.

Thermistor element 2 as described in claim 1, characterized in that, the inner electrode containing Pt.

According to claim 3 thermistor element 1 or the 2, characterized in that, but at least has a coating of the lead

Part of the insulating layer terminal connecting to the terminal electrodes.

Technical field

[0001]

The invention relates to a thermistor element, more specifically, relates to the use of a high reliability in hightemperature

Thermistor.

The technical background

[0002]

As the thermistor element determination of automobile exhaust gas temperature, has always been to 800 ℃temperature sensitive detection

The resistance element is the mainstream. But recently, more and more requirements for determination of gas inplace more close to the engine temperature, hope

Research and development of 850 ~ 1100 ℃ can measure temperature thermistor.

[0003]

For example, patent 1 discloses sintered electroconductive oxide conductive material used as thermal resistance,this paper

Conductive oxide sintering embodiment is disclosed in the offering of yttrium oxide, strontium carbonate, chromium oxide, manganese oxide, alumina as raw material

Body. However, the thermistor using such conductive oxide sintered body temperature, high temperature over 900 ℃under

There is the problem of low reliability test.

[0004]

[1] the Japanese patent documents opened 2003-183075 statement No.

The content of the invention

[0005]

The invention is in view of the actual situation that made, its purpose is to provide, use at relatively hightemperatures

Thermistor has high reliability.

[0006]

In order to realize the aim, the thermistor element of the invention has an internal clamp with the thermal resistor layer containing more than two

The electrode layer of the element body formed in the element, the outer surface of the main body, the inner electrode layer is connected to the opposite of the

The electrode layer of a pair of terminal electrodes, and the lead is connected to the terminal electrode terminal,which is characterized in that,

The thermistor layer is composed of YaCabCrcAldM1eO3 expression in the oxide,

The composition of a and B by a+b = 1,

The composition of C, D and E are related by c+d+e = 1,

At least one of the components in Co, Sn, M1 selected for Nd, Pr, Ga and Ni,

The composition of a for 0.5 ≤ a ≤ 0.99,

The composition of B for 0.01 ≤ B ≤ 0.50,

The composition of C for 0.06 ≤ C ≤ 0.64,

The composition of D for 0.01 ≤ D ≤ 0.94,

The composition of E for 0 ≤ e ≤ 0.35,

The thermistor layer substantially does not contain Sr and Mn.

[0007]

The thermistor is best the internal electrode layer containing Pt.

[0008]

The thermistor is best and at least has a coating of the lead terminals connected to the terminal electrode part

An insulating layer of.

[0009]

If the use of the invention, can use at higher temperature also has the high reliability of the thermistor element

Piece. Specifically, can provide even in high temperature conditions, the thermistor resistance element values before and after use

Thermistor changes also small.

Description of figures

[0010]

Figure 1 is a thermistor element of the invention embodiment to longitudinal profile.

Figure 2 is a cross section of thermistor elements are shown in Figure 1 of the II-II line..

Symbolic description

2. Thermistor (laminated type thermistor)

4. The element body

6, 6a... The thermal resistor layer

8. The internal electrode layers

10. Terminal electrode

12. Lead terminal

14. The insulating layer

16. The metal shell

The specific way of implementing

[0011]

According to the form shown in the figure of the invention is described.

As shown in Figure 1, 2 shows, thermistor element is the embodiment of the 2 elements is main body 4, 10, aterminal electrode

The pair of lead terminals 12, and an insulating layer 14.

[0012]

The whole surface of two end of each terminal electrode 10 is formed along the Z axis in the component body of 4,but not necessarily have to shape

In the end.

[0013]

A pair of lead terminals 12 front end use adhesive plaster or