Patent Number: 6,309,749

Title: Ceramic milling media containing tetragonal zirconia

Abstract: The present invention is milling media composed of ceramic particles having an average size of 0.1 to 20 mm. The ceramic particles contain a tetragonal zirconia core and a continuous shell on the core comprising cubic zirconia, monoclinic zirconia, spinel or zircon. The present invention is also a method of manufacturing the milling media which includes providing ceramic particles having an average size of 0.1 to 20 mm. The ceramic particles are tetragonal zirconia. The ceramic particles are coated with a clay material and sintered to form a shell of cubic zirconia, monoclinic zirconia, spinel or zircon over the tetragonal zirconia core.

Inventors: Chatterjee; Dilip K. (Rochester, NY), Blanton; Thomas N. (Rochester, NY), Majumdar; Debasis (Rochester, NY)

Assignee: Eastman Kodak Company

International Classification: C04B 35/626 (20060101); C04B 41/50 (20060101); C04B 35/628 (20060101); C04B 35/488 (20060101); C04B 35/486 (20060101); C04B 41/45 (20060101); B32B 005/16 (); C04B 035/486 (); C04B 035/488 ()

Expiration Date: 10/30/2018