High strength ceramics with novel fracture mode
US-11299428-B2 · Apr 12, 2022 · US
High strength ceramics with novel fracture mode
US11807580B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11807580-B2 |
| Application number | US-202217716085-A |
| Country | US |
| Kind code | B2 |
| Filing date | Apr 8, 2022 |
| Priority date | Apr 27, 2016 |
| Publication date | Nov 7, 2023 |
| Grant date | Nov 7, 2023 |
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Abstract
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The present invention provides a method for making a high strength, small grain size ceramic having a transgranular fracture mode by rapid densification of a green body and subsequent cooling of the densified ceramic. The ceramic may include dislocations, defects, dopants, and/or secondary phases that are formed as a result of the process and resulting in stress fields capable of redirecting or arresting cracks within the material. This ceramic can maintain transparency from ultraviolet to mid-wave infrared.
First claim
Opening claim text (preview).
What is claimed as new and desired to be protected by Letters Patent of the United States is: 1. A method for making a ceramic having transgranular fracture behavior, comprising: forming a green body comprising lutetium oxide powder; densifying the green body using microwaves to heat the green body at a rate of 100° C./min to 1500° C. and then holding at 1500° C. for 15 minutes, wherein the microwave frequency is greater than 30 GHz, wherein a ceramic is formed, and wherein there are dislocations within the ceramic; and cooling the ceramic to room temperature to trap the dislocations in the ceramic, resulting in a ceramic having a transgranular fracture mode. 2. The method of claim 1 , wherein said green body is formed by cold isostatic pressure, slip casting, tape casting, or any combination thereof. 3. The method of claim 1 , wherein said green body is densified using a cavity designed to produce uniform heating throughout said green body. 4. The method of claim 1 , wherein the microwaves are used without the use of a susceptor or indirect heating. 5. The method of claim 1 , wherein said ceramic powder is doped with calcium prior to green body formation.
Assignees
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Classifications
- C04B35/505Primary
based on yttrium oxide · CPC title
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based on BaTiO3 perovskite phase · CPC title
based on rare-earth compounds {(non-oxide rare earth compounds C04B35/5156)} · CPC title
Removal thereof · CPC title
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- What does patent US11807580B2 cover?
- The present invention provides a method for making a high strength, small grain size ceramic having a transgranular fracture mode by rapid densification of a green body and subsequent cooling of the densified ceramic. The ceramic may include dislocations, defects, dopants, and/or secondary phases that are formed as a result of the process and resulting in stress fields capable of redirecting or…
- Who is the assignee on this patent?
- Us Gov Sec Navy
- What technology area does this patent fall under?
- Primary CPC classification C04B35/505. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Nov 07 2023 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 2 related publications on this page (citations in our corpus or others sharing the same primary CPC).