# US 8,784,519 B2 · Vitrious bonded abbrasive > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,784,519 B2 - Document ID: US8784519B2 - Status: Granted - Kind: B2 - Application number: 13/504,915 - Filed: 2010-10-27 - Published: 2012-10-25 - Granted: 2014-07-22 - Earliest claimed: 2009-10-27 - Assignees: Saint-Gobain Abrasives, Inc.; Saint-Gobain Abrasifs - Applicants: Ramanujam Vedantham; Rachana Upadhyay; Gilles Querel - Inventors: Ramanujam Vedantham; Rachana Upadhyay; Gilles Querel - Web page: https://patentgrep.com/patent/US8784519B2 ## CPC - B24D 3/10: for porous or cellular structure, e.g. for use with diamonds as abrasives - B24B 37/245: {Pads with fixed abrasives} - B24D 3/18: for porous or cellular structure - C09K 3/1409: {Abrasive particles per se (preparation of diamond C01B32/25)} - B24D: TOOLS FOR GRINDING, BUFFING OR SHARPENING (abrading-bodies specially designed for tumbling apparatus, e.g. abrading-balls B24B31/14; honing tools B24B33/08; lapping tools B24B37/11) - B24B: MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING (grinding of gear teeth B23F, of screw-threads B23G1/36; by electro-erosion B23H; abrasive or related blasting B24C; tools for grinding, buffing or sharpening B24D; polishing compositions C09G1/00; abrasives C09K3/14; electrolytic etching or polishing C25F3/00; grinding arrangements for use on assembled railway tracks E01B31/17); DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS - C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE ## Abstract A vitrified superabrasive product includes a superabrasive component and a vitrified bond component in which the superabrasive component is dispersed. The vitrified bond includes an oxide of a lanthanoid. Additionally, the vitrified bond component defines pores that can be essentially all less than 800 μm in diameter. Seventy percent of the pores are in a range of between about 40 μm and about 500 μm and have an average aspect ratio less than about 2. The porosity is in a range of between about 50% and about 90% of the total volume of the superabrasive product. ## Claims ### Claim 1 A grinding tool, comprising: a) a base; and b) a vitrified superabrasive component at a surface of the base, the vitrified superabrasive component including: i) a superabrasive component; and ii) a vitrified bond component in which the superabrasive component is dispersed, the vitrified bond component including an oxide of a lanthanoid comprising cerium oxide, wherein the vitrified bond component defines pores occupying greater than about fifty percent of the total volume of the vitrified superabrasive component, wherein the oxide of the lanthanoid is present in an amount in a range of between about 0.1 volume percent and about 10 volume percent of the vitrified superabrasive product. ### Claim 2 (depends on 1) The grinding tool of claim 1, wherein the oxide of the lanthanoid includes an element having an atomic number not less than 57 and not greater than 60. ### Claim 3 (depends on 1) The grinding tool of claim 1, wherein a volume ratio of the superabrasive component to the vitrified bond component is in a range of between about 3:2 and about 1:99. ### Claim 4 (depends on 1) The grinding tool of claim 1, wherein the superabrasive component is present in an amount in a range of between about 0.1 and about 20 volume percent of the vitrified superabrasive component. ### Claim 5 (depends on 1) The grinding tool of claim 1, wherein a median particle size of the superabrasive component is in a range of between about 0.1 microns and about 60 microns. ### Claim 6 (depends on 1) The grinding tool of claim 1, wherein the vitrified bond component includes at least one member selected from the group consisting of silicon dioxide (SiO2), boron oxide (B2O3), aluminum oxide (Al2O3), alkali oxides (Li2O, Na2O, K2O) and alkaline earth oxides (CaO, MgO, BaO). ### Claim 7 (depends on 1) The vitrified superabrasive product of claim 1, wherein: the vitrified bond component defines pores that are all less than 800 μm in diameter, seventy percent of which are in a range of between about 40 μm and about 500 μm, and have an average aspect ratio less than about 2, and wherein the vitrified superabrasive product has a Surface Roughness Index of not greater than about 35 Angstroms. ### Claim 8 (depends on 7) The vitrified superabrasive product of claim 7, wherein a majority of the pores are large pores having a average pore size of at least about 100 μm. ### Claim 9 (depends on 8) The vitrified superabrasive product of claim 8, wherein a large pore spacing distance between immediately adjacent large pores is not greater than a radial distance (DR), wherein the radial distance (DR) is defined as a measure of the average radius of the large pores. ### Claim 10 (depends on 9) The vitrified superabrasive product of claim 9, wherein the large pore spacing is not greater than about 0.5(DR). ### Claim 11 (depends on 8) The vitrified superabrasive product of claim 8, wherein a majority of the large pores are abutting each other. ### Claim 12 (depends on 11) The vitrified superabrasive product of claim 11, wherein at least about 75% of the large pores are abutting each other. ### Claim 13 (depends on 8) The vitrified superabrasive product of claim 8, wherein bond bridges comprising the vitrified bond material extend between the large pores. ### Claim 14 (depends on 13) The vitrified superabrasive product of claim 13, wherein the bond bridges comprise small pores having an aspect ratio of less than about 2. ### Claim 15 (depends on 14) The vitrified superabrasive product of claim 14, wherein the small pores have a average pore size of less than about 100 μm. ### Claim 16 (depends on 7) The vitrified superabrasive product of claim 7, wherein the vitrified bond component has a porosity in a range of between about 50% and about 90% of the total volume of the vitrified superabrasive product. ### Claim 17 A method of forming a vitrified superabrasive product, comprising: a) forming a green body that includes a glass powder, a superabrasive grit, a binder, silicon carbide, and an oxide of a lanthanoid comprising cerium oxide, wherein the oxide of the lanthanoid comprises an average particle size within a range between about 0.1 microns and about 30 microns; and b) firing the green body under an atmosphere and pressure, and at a temperature, sufficient to form a porous vitrified superabrasive product. ### Claim 18 (depends on 17) The method of claim 17, wherein the binder includes at least one member selected from the group consisting of polyethylene glycol, water, a mixture of polyethylene glycol and water and colloidal silica.