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US 9,669,517 B2Granted
Submicron alpha alumina high temperature bonded abrasives
AssigneeSaint-Gobain Ceramics & Plastics, Inc.
InventorsRalph Bauer, Margaret L. Skowron
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Abstract
A high temperature bonded abrasive includes alumina abrasive grits, and a vitreous bond matrix in which the alumina abrasive grits are distributed, the vitreous bond matrix having a cure temperature not less than 1000° C. The alumina abrasive grits include polycrystalline alpha alumina having a fine crystalline microstructure characterized by an alpha alumina average domain size not greater than 500 nm, and the alumina abrasive grits further include a pinning agent that is a dispersed phase in the polycrystalline alpha alumina.
Claims19
A high temperature bonded abrasive component, comprising:
- alumina abrasive grits;
- and
- a vitreous bond matrix that bonds 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 comprising polycrystalline alpha alumina having an average domain size of not greater than 300 nm, and wherein the alumina abrasive grits further comprise a pinning agent, the pinning agent comprising a dispersed phase in the polycrystalline alpha alumina,
- and wherein the alumina abrasive grits have a Crystal Stability of at least 1400° C., where 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.
2 more elements
Dependencies are inferred from the claim text.