Abrasive article for high-speed grinding operations

摘要

An abrasive article includes a bonded abrasive body having abrasive particles comprising microcrystalline alumina (MCA) contained within a bond material. In an embodiment, the bonded abrasive body has a strength ratio (MOR/MOE) of at least about 0.80. Additionally, the bonded abrasive body may have a MOR of at least 40 MPa for a MOE or at least about 40 GPa and the bonded abrasive body may be capable of grinding a workpiece that includes metal at a speed of at least about 60 m/s at a material removal rate of at least about 0.4 in3/min/in (258 mm3/min/mm).

主权项

1. An abrasive article comprising:
a bonded abrasive body having abrasive particles comprising microcrystalline alumina (MCA) contained within a single phase vitreous bond material; wherein the bonded abrasive body comprises:
a strength ratio (MOR/MOE) of at least 1.0;a porosity content of at least 42 vol % and not greater than 56 vol % for the total volume of the bonded abrasive body,an abrasive particle content of at least 42 vol % and not greater than 52 vol % for the total volume of the bonded abrasive body; anda bond material content of at least 6 vol % and not greater than 14 vol % for the total volume of the bonded abrasive body; and wherein the single phase vitreous bond material comprises:
a content of boron oxide (B2O3) in an amount of at least 13 wt % and not greater than 17 wt % for a total weight of the bond material; anda content of silicon oxide (SiO2) in a wt % amount of at least about 1.5 times greater than the amount of boron oxide (B2O3) and not greater than about 5 times greater than the amount of boron oxide (B2O3).