JPS62215860A - Measuring device for oxygen ion conductivity properties - Google Patents

Abstract

PURPOSE:To make it possible to rapidly measure a characteristic, by a method wherein a disc-shaped specimen is held between metal rings and tightened by a ceramic pipe and nut having the electric paths applied to the inner and outer surfaces thereof. CONSTITUTION:Both of a ceramic pipe 1 and a ceramic nut 2 are coated with a metal as shown by dotted lines. A specimen 4 is held between metal O-rings 3 at both sides thereof and strongly tightened by the pipe 1 and the nut 2. Therefore, the oxygen pressures inside and outside the pipe 1 can be respectively set independently by changing the oxygen partial pressure in the gas supplied from the left and right of an apparatus. The potential of the right side surface of the specimen 4 is transmitted to the metal applied to the inside of the pipe 1 through the right O-ring to be guided to the outside of a furnace while the potential of the left side surface of the specimen 4 is transmitted to the metal applied to the outside of the nut 2 through the left O-ring and further transmitted to the metal applied to the outside of the pipe 1 through a screw part to be guided to the outside of the furnace. Therefore, an electric wire for measuring electromotive face becomes unnecessary.

Description

[Detailed description of the invention] Industrial applications The present invention relates to an apparatus for measuring oxygen ion conductivity properties.

Substances exhibiting oxygen ion conductive properties have been developed as oxygen concentration measuring devices and solid-state batteries, and are widely used in the automobile industry and the like. However, research is being conducted to develop new oxygen ion conductive materials, and measurement of oxygen ion conductivity properties is important for research and development.

Prior Art A conventional device for measuring oxygen ion conductivity characteristics had a structure in which the circumference of a disk-shaped sample and the end of a ceramic pipe were glass-welded to make it airtight.

Therefore, a process of connecting the sample and the ceramic pipe is necessary before measuring the characteristics, and once the sample is used for measurement, it is difficult to use it for other measurements. Furthermore, since the welded part is made of glass, it is not possible to measure temperatures above the softening point of glass. Another problem was that lead wires had to be drawn from the electrodes coated on both sides of the disk-shaped sample.

Purpose of the Invention The present invention was made to solve the problems in conventional devices, and does not require the process of connecting the sample and the ceramic pipe or the operation of pulling out lead wires from the electrodes provided on both sides of the disk-shaped sample. The goal is to provide a device that can be measured immediately.

Structure of the Invention The present invention solves the difficulties of the conventional method by connecting a disk-shaped oxygen ion conductive sample and a ceramic pipe using a metal ring as a banking, and by connecting a metal ring coated on the inside and outside of the ceramic pipe. This problem was solved by using it as an electric path for measuring electromotive force.

The gist of the present invention is that a disk-shaped sample is held between metal rings, and the sample is tightened with a ceramic pipe and a nut, each of which has an electric circuit coated on the inner and outer surfaces of the pipe and nut. Located in a device for measuring ionic conductivity properties.

To explain the oxygen ion conductivity measuring device of the present invention with reference to the drawings, Fig. 1 is a schematic cross-sectional view of the device, where 1 is a ceramic pipe with a male thread at the end, and 2 is a ceramic pipe with a male thread at the end. A ceramic nut with a female thread, 3 a metal O-ring, 4 an oxygen ion conductive disc-shaped sample, and 5 an electric furnace.

FIG. 2 is an assembled diagram of the sample insertion, and the dotted line indicates the part coated with metal. The sample is held on both sides by metal O-rings 3, and is strongly tightened by a ceramic pipe 1 and a ceramic nut 2. Therefore, the O-ring maintains airtightness between the inside and outside of the pipe. The oxygen pressure inside and outside the pipe can be set independently by changing the partial pressure of oxygen in the gas supplied from the left and right sides of the device. The potential on the right side of the sample is
Pass through the metal O-ring on the right and insert ceramic pipe 1.
It is transmitted to the metal coated on the inside of the furnace and guided out of the furnace. Also, the potential on the left side of the sample is the metal O on the left.
It is transmitted through the ring to the metal coated on the outside of the ceramic nut 2, further through the threaded part to the metal coated on the outside of the ceramic pipe 1, and is led out of the furnace. Therefore, an electric wire for measuring the electromotive force is unnecessary for this apparatus, and a step of connecting the electric wire to the sample is also unnecessary.

Effects of the Invention According to the device of the present invention, oxygen ion conductivity characteristics can be measured quickly with a simple device, the sample used for measurement can be used for other measurements, and measurement can be performed at temperatures higher than conventional measurement temperatures. It becomes possible. Further, an electric wire for measuring the electromotive force is not required, and therefore, there is no need to connect the sample to the electric wire.

Example Alumina was selected as the ceramic material, and gold was used as the O-ring and electric circuit material. Stabilized bismuth oxide was used as a sample, and the apparatus shown in FIG. 1 was used.

The temperature of the sample is from 2oo℃ to 750℃, and the rate is 2℃ per minute.
The temperature was raised. When the right side of the sample is exposed to 1 atmosphere of oxygen and the left side is exposed to 1 atmosphere of high-purity argon, the oxygen pressure on the left side is less than 1 ppm during the test, and the airtightness between the sample and the ceramic pipe is well established. I understand.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of the apparatus of the present invention, and FIG. 2 is an assembly diagram for inserting a sample. l; Ceramic pipe. 2: Ceramic nut. 3: Metal O-ring, 4: Disc-shaped sample. 5: Electric furnace. Patent Applicant Science and Technology Agency Research Institute for Inorganic Materials

Claims (1)

[Claims] A device for measuring oxygen ion conductivity characteristics, characterized in that a disk-shaped sample is held between metal rings and then tightened with a ceramic pipe and a nut, each of which has an electrical circuit coated on the inner and outer surfaces of the pipe and nut. .