ALUMINA-ZIRCONIA CERAMIC

Abstract

A ceramic consisting essentially of from 1 to 15 percent of glass and 99 to 85 percent of a mixture of particulate Al2 O3 and particulate ZrO2 is disclosed. ZrO2 is present in a sufficient amount, usually from 1/4 to 6 percent based on the weight of the ZrO2 and Al2 O3, to strengthen the ceramic significantly, by comparison with an otherwise identical ceramic where the particulate ZrO2 is replaced either by the glass or by particulate Al2 O3. The glass constitutes a vitreous phase bonding the particulates into a dense, gas impervious structure, and can be a calcium magnesium silicate glass containing from 45 to 80 percent of SiO2, from 8 to 55 percent of CaO and MgO, and not more than 15 percent of Al2 O3.

Source: Google Patents

35 USC §181 Secrecy Order

Inventor

• 1WILLIAM R. MANNIING