Submicron alpha alumina high temperature bonded abrasives

A high temperature bonded abrasive component, comprising:

• alumina abrasive grits;
• and
• a vitreous bond matrix that bonds the alumina abrasive grits to each other and in which the alumina abrasive grits are distributed, the vitreous bond matrix having a cure temperature not less than 1000° C., wherein
• the alumina abrasive grits comprise polycrystalline alpha alumina having a fine crystalline microstructure characterized by an alpha alumina average domain size not greater than 300 nm;
• the alumina abrasive grits further comprise a pinning agent, the pinning agent comprising at least one oxide of boron, titanium, zirconium, a rare earth oxide or a combination thereof;
• having an average particulate size not greater than 5 microns;
• and comprising a dispersed phase in the polycrystalline alpha alumina;
• and
• the alumina abrasive grits have a Crystal Stability of at least 1400° C., wherein Crystal Stability is the temperature at which the alumina abrasive grits undergo domain growth quantified by an average domain size not greater than 300 nm, after 5 minutes of exposure at said temperature.