# US 12,111,282 B2 · Solid electrolyte and gas sensor with thermal shock resistance

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- Number: US 12,111,282 B2
- Document ID: US12111282B2
- Status: Granted
- Kind: B2
- Application number: 17/448,733
- Filed: 2021-09-24
- Published: 2022-01-13
- Granted: 2024-10-08
- Earliest claimed: 2019-03-26
- Assignees: Denso Corporation
- Applicants: Denso Corporation
- Inventors: Mitsuhiro Yoshida; Satoshi Suzuki
- Web page: https://patentgrep.com/patent/US12111282B2

## CPC

- G01N 27/4073: {Composition or fabrication of the solid electrolyte}
- C04B 35/486: Fine ceramics
- H01B 1/06: mainly consisting of other non-metallic substances
- C04B 2235/3225: Yttrium oxide or oxide-forming salts thereof
- C04B 2235/3246: Stabilised zirconias, e.g. YSZ or cerium stabilised zirconia
- C04B 2235/9607: Thermal properties, e.g. thermal expansion coefficient
- G01M 15/102: {by monitoring exhaust gases}
- G01N 27/4071: {using sensor elements of laminated structure}
- G01N 27/409: Oxygen concentration cells
- Y02E 60/50: Fuel cells
- G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q)
- C04B: LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE {(roofing granules E04D7/005)}; CERAMICS (devitrified glass-ceramics C03C10/00); REFRACTORIES; TREATMENT OF NATURAL STONE
- H01B: CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES (selection for magnetic properties H01F1/00; waveguides H01P {; printed circuits H05K})
- G01M: TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

A solid electrolyte includes stabilized or partially stabilized zirconia, and a gas sensor provided with the solid electrolyte. A change rate of a crystallite diameter for at least one of a cubic phase and a tetragonal phase in crystal particles constituting the solid electrolyte configured by a fired body after performing an annealing treatment, before and after heating the solid electrolyte from room temperature to 1200° C., is 10% or less. The solid electrolyte preferably includes partially stabilized zirconia.

## Claims

### Claim 1

A solid electrolyte comprising partially stabilized zirconia,
wherein:
in the solid electrolyte, an yttria content of the partially stabilized zirconia is in a range of 4.5 mol % or more and 8 mol % or less; and
a change rate of a crystallite diameter for a cubic phase in crystal particles constituting the solid electrolyte configured by a fired and annealed body produced after performing an annealing treatment, before heating from room temperature to 1200° C. and after cooling from 1200° ° C. to room temperature in a cold-hot cycle, is 4% or less, and the annealing treatment heats the fired body comprising the partially stabilized zirconia to produce the fired and annealed body.

### Claim 2 (depends on 1)

A gas sensor comprising the solid electrolyte according to claim 1.

### Claim 3 (depends on 1)

The solid electrolyte according to claim 1, wherein
the solid electrolyte is constituted by a mixed phase of the cubic phase and a monoclinic phase.

### Claim 4 (depends on 2)

The gas sensor according to claim 2, further comprising a sensor element that detects gas, wherein:
the sensor element comprises the solid electrolyte, a detection electrode, and a reference electrode;
the detection electrode and the reference electrode are respectively formed on both surfaces of the solid electrolyte; and
the detection electrode and the reference electrode form a pair of electrodes which are formed in positions facing each other.