High strength ceramics with novel fracture mode

US11299428B2 · kind B2 · utility

Assignee

• The Government of the United States of America, as represented by the Secretary of the Navy · US

Inventors

• Michael Hunt · Alexandria, US
• Guillermo R. Villalobos · Springfield, US
• Benjamin Rock · Rockville, US
• Shyam S. Bayya · Ashburn, US
• Woohong Kim · Lorton, US
• Ishwar D. Aggarwal · Waxhaw, US
• Bryan Sadowski · Falls Church, US
• Jasbinder S. Sanghera · Greenbelt, US

Key dates

• Filing date: Apr 27, 2017
• Grant date: Apr 12, 2022
• Expiry date: Nov 14, 2037

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C04B2235/786
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

The present invention provides a method for making a high strength, small grain size ceramic having a trans-granular 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.