# US 10,865,148 B2 · Particulate materials and methods of forming same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,865,148 B2 - Document ID: US10865148B2 - Status: Granted - Kind: B2 - Application number: 16/013,067 - Filed: 2018-06-20 - Published: 2018-12-27 - Granted: 2020-12-15 - Earliest claimed: 2017-06-21 - Assignees: Saint-Gobain Ceramics & Plastics, Inc. - Applicants: Saint-Gobain Ceramics & Plastics, Inc. - Inventors: Samuel S. Marlin; David F. Louapre; Jennifer H. Czerepinski; Lucie Fraichard - Web page: https://patentgrep.com/patent/US10865148B2 ## CPC - C04B 35/1115: {Minute sintered entities, e.g. sintered abrasive grains or shaped particles such as platelets (abrasives C09K3/14)} - C04B 35/117: Composites - C04B 35/6263: {characterised by their solids loadings, i.e. the percentage of solids} - C04B 35/64: Burning or sintering processes (C04B33/32 takes precedence {; powder metallurgy B22F}) - C09K 3/1436: {Composite particles, e.g. coated particles} - C04B 2235/3213: Strontium oxides or oxide-forming salts thereof - C04B 2235/3217: Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina - C04B 2235/3229: Cerium oxides or oxide-forming salts thereof - C04B 2235/5292: Flakes, platelets or plates - C04B 2235/5296: with a defined aspect ratio, e.g. indicating sphericity - C04B 2235/6021: Extrusion moulding - C04B 2235/80: Phases present in the sintered or melt-cast ceramic products other than the main phase - C04B 2235/95: Products characterised by their size, e.g. microceramics - C04B: LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE {(roofing granules E04D7/005)}; CERAMICS (devitrified glass-ceramics C03C10/00); REFRACTORIES; TREATMENT OF NATURAL STONE - C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE ## Abstract A particulate material having a body including a first phase including alumina having an average crystallite size of not greater than 5 microns, and the body further including a second phase having a platelet shape. ## Claims ### Claim 1 A particulate material comprising a body including a first phase including alumina having an average crystallite size of not greater than 5 microns, wherein the body further comprises a second phase having a platelet shape, wherein the second phase consists of Strontium (Sr) and Cerium (Ce) and wherein the body comprises a ratio of Sr:Ce of at least 1:1. ### Claim 2 (depends on 1) The particulate material of claim 1, wherein the platelets have a length (l) and a width (w) as viewed in two dimensions and wherein l>w. ### Claim 3 (depends on 2) The particulate material of claim 2, wherein the platelets have an average primary aspect ratio of length:width of at least 2:1 and not greater than 1000:1. ### Claim 4 (depends on 1) The particulate material of claim 1, wherein the platelets are uniformly distributed throughout the body. ### Claim 5 (depends on 1) The particulate material of claim 1, wherein the body comprises not greater than 50 platelet clusters per 500 square microns. ### Claim 6 (depends on 1) The particulate material of claim 1, wherein the body comprises at least 90 wt % and not greater than 99 wt % alumina for the total weight of the body. ### Claim 7 (depends on 1) The particulate material of claim 1, wherein the body comprises Sr in a range of at least 0.2 wt % and not greater than 5 wt % for a total weight of the body. ### Claim 8 (depends on 1) The particulate material of claim 1, wherein the body comprises a Ce content within a range of at least 0.05 wt % and not greater than 2 wt % for a total weight of the body. ### Claim 9 (depends on 1) The particulate material of claim 1, wherein the body comprises Sr and Ce in a ratio of Sr:Ce of not greater than 100:1. ### Claim 10 (depends on 1) The particulate material of claim 1, wherein the body consists essentially of the first phase and the second phase. ### Claim 11 (depends on 1) The particulate material of claim 1, wherein the body is free of a third phase. ### Claim 12 (depends on 1) The particulate material of claim 1, wherein the body includes at least 0.5 wt % of a third phase for a total weight of the body, wherein the third phase comprises at least one of an oxide, carbide, nitride, boride, or any combination thereof. ### Claim 13 (depends on 1) The particulate material of claim 1, wherein further comprising a fixed abrasive article including the particulate material. ### Claim 14 (depends on 13) The particulate material of claim 13, wherein the fixed abrasive is selected from the group consisting of a coated abrasive, a bonded abrasive, a non-woven abrasive, an abrasive brush, or a combination thereof. ### Claim 15 (depends on 13) The particulate material of claim 13, wherein the fixed abrasive is a coated abrasive article including the particulate material arranged in a single layer overlying a substrate. ### Claim 16 (depends on 1) The particulate material of claim 1, wherein the particulate material is a shaped abrasive particle comprising a body with a two-dimensional shape as defined by a major surface of the body from the group of shapes including polygons, irregular polygons, irregular polygons including arcuate or curved sides or portions of sides, ellipsoids, numerals, Greek alphabet characters, Latin alphabet characters, Russian alphabet characters, Kanji characters, complex shapes having a combination of polygons shapes, shapes including a central region and a plurality of arms, or any combination thereof. ### Claim 17 (depends on 1) The particulate material of claim 1, wherein the particulate material is a controlled thickness abrasive particle having a body of a uniform thickness and an irregular two dimensional shape when viewed in the plane defined by the length and width of the body. ### Claim 18 A particulate material comprising a body including a first phase including alumina and a second phase having a platelet shape, wherein the second phase consists of Strontium (Sr) and Cerium (Ce), wherein the second phase comprises Sr in a range of at least 0.2 wt % and not greater than 5 wt % for a total weight of the body and wherein the body comprises a ratio of Sr:Ce of at least 1:1. ### Claim 19 (depends on 18) The particulate material of claim 18, wherein the second phase comprises a Sr content within a range of at least in a range of at least 1 wt % and not greater than 3 wt % for a total weight of the body, and wherein the second phase comprises a Ce content within a range of at least 0.05 wt % and not greater than 2 wt % for a total weight of the body. ### Claim 20 (depends on 19) The particulate material of claim 19, wherein the body comprises not greater than 50 platelet clusters per 500 square microns and further wherein the body comprises at least 90 wt % and not greater than 99 wt % alumina for the total weight of the body.