Zirconia sintered body, zirconia powder, and method for producing zirconia sintered body
A zirconia sintered body stabilized with yttrium and another oxide, such as Ca, Ba, Sr, Dy, Tb, Gd, Eu, Sm, or La, addresses thermal and hydrothermal degradation issues by low-temperature sintering, ensuring superior mechanical properties and resistance to phase transformations.
JP7734268B2Active Publication Date: 2025-09-04DAIICHI KIGENSO KAGAKU KOGYO CO LTD
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Patent Information
- Application Number
- JP2024506126
- Authority / Receiving Office
- JP · JP
- Patent Type
- Patents
- Current Assignee / Owner
- Priority Date
- 2022-03-11
- Filing Date
- 2023-03-03
- Publication Date
- 2025-09-04
- Estimated Expiration
- 2043-03-03
AI Technical Summary
Technical Problem
Existing zirconia sintered bodies suffer from poor thermal degradation resistance and mechanical properties, despite having high hydrothermal degradation resistance, due to uncontrolled phase transformations at high temperatures.
Method used
A zirconia sintered body stabilized with a combination of yttrium and another oxide (M) such as Ca, Ba, Sr, Dy, Tb, Gd, Eu, Sm, Nd, or La, with a controlled molar ratio and grain size of 0.20 μm or less, achieved through low-temperature sintering.
Benefits of technology
The solution provides excellent resistance to both hydrothermal and thermal degradation, along with enhanced mechanical properties, maintaining stability and strength under high-temperature conditions.
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Abstract
A zirconia sintered body containing stabilized zirconia containing zirconia and a stabilizer, in which the stabilizer contains an oxide of yttrium and an oxide of M, M is one or more selected from the group consisting of Ca, Ba, Sr, Dy, Tb, Gd, Eu, Sm, Nd, Pr, and La, the content of stabilizer in the stabilized zirconia is from 1.7 mol% to 2.6 mol% in terms of oxide, the molar ratio [(oxide of M) / (oxide of yttrium)] of the oxide of M and oxide of yttrium is from 0.05 to 1.5, and the crystal grain size is 0.20 μm or less.
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