Abrasive Article Including Shaped Abrasive Particles | Publication Date: 6.2.15
Summary:
A shaped abrasive particle including a body comprising a first major surface, a second major surface, and a side surface extending between the first major surface and the second major surface, the body comprising a sharpness-shape-strength factor (3SF) within a range between about 0.7 and about 1.7 and a Shape Index within a range between at least about 0.01 and not greater than about 0.49. A shaped abrasive particle comprising: a body comprising a first major surface, a second major surface, and a side surface extending between the first major surface and the second major surface, wherein the body comprises a first maximum tip width (Wt1) that defines a maximum width of a first arm of the body, and wherein the first maximum tip width (Wt1) is disposed a distance from a first terminal end of the first arm and between a midpoint of the body and the first terminal end. A shaped abrasive particle comprising a body comprising a first major surface, a second major surface, and a side surface extending between the first major surface and the second major surface, wherein a first portion of the side surface has a partially-concave shape.
Keywords:
Alumina, Alpha-Alumina, shaped abrasive particle (SAP), SAPS, SAPs, polyhedron, pyramid, ellipsoid, sphere, prism, cylinder, cone, tetrahedron, cube, cuboid, rhomohedron, truncated pyramid, truncated ellipsoid, truncated sphere, truncated cone, pentahedron, hexahedron, heptahedron, aoctahedron, nonahedron, decahedron, Greek alphabet character, Latin alphabet character, Russian alphabet character, volcano shape, monostatic, tip sharpness, tip-sharpness, strength, strong, high strength, thin, thin shape, thin shaped, FLT, major surface, shape index, shaprness-shape-strength, 3SF, side surface, strength, MPa, dopant, dopant material, rare earth element, transition metal, alkali element, polycrystalline, crystalline, grains, grain size, average grain size, concave, partially concave, linear section, linear section length, aspect ratio, interior corner, angle, concave shape
Download >>Investigation of Shaped Abrasive Particles Vol. 1: Review of US Pat. No. 6,054,093 April 25, 2000 | Publication Date: 4.2.15
Summary:
Shaped abrasive particles have been known and utilized in various capacities within the field of grinding and finishing technologies for over 15 years. Shaped abrasive particles disclosed in US Pat. No. 6,054,093 (hereinafter the “‘093 Patent”) are formed through a screen printing process, referred to as the Torre Process. The following review characterizes the Torre particles formed according to Example 1 as described in the ‘093 Patent.
The following characteristics of the Torre particles include:
- The radius of curvature
- Grooves and protrusions including the ratio between the groove depth and average thickness
- Raised corners including the ratio between the corner thickness and midpoint thickness
- Perpendicular, obtuse, and acute angles between the surfaces
Keywords:
Inherent features of Shaped Abrasive Particles (SAPs), surface, major surface, contours, concave, convex, scoop-shape, curved, radius of curvature, sloping, sidewall, side wall, hole, holes, groove, grooves, screen printing, protrusions, thickness, artifacts, depth, raised corner, angles, sharpened edge, pattern, openings, body.
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Shaped Abrasive Particle Fractions and Method of Forming Same | Publication Date: 3.30.15
Summary:
Various methods of forming shaped abrasive particles including forming shaped abrasive particles having at least one predetermined stress concentration point and at least one predetermined stress concentration vector. Forming can include processing the precursor and fracturing the precursor shaped abrasive particle substantially along the predetermined stress concentration vector to form a fractured shaped abrasive particle. A shaped abrasive particle of may include a body having a bottom surface, an upper surface, and a side surface extending between the bottom surface and the upper surface, where the upper surface defines a shovel shape including a concave surface having a tip region including at least one tip corner and at least one rear region defining at least one rear corner. The tip corner can have a tip sharpness that is greater than a tip sharpness of the at least one rear corner.
Keywords:
Sol-gel, gel, production tooling, shaped abrasive particle (SAP), screen printing, molding, fracturing, fracture, tip, tip sharpness, shovel, concave surface, tip region, mixture.
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Shaped Abrasive Particle and Method of Forming Same | Publication Date: 3.30.15
Summary:
Methods of forming shaped abrasive particles. One method includes forming a mixture into a sheet and sectioning at least a portion of the sheet using a mechanical object to form a shaped abrasive particle from the sheet. Sectioning can include controlling at least one process parameter consisting of an extrusion height, a moisture content, a sheet solids loading, an orientation of the sheet during sectioning, a pressure differential during sectioning, a blade spacing variation, a blade edge thickness, a ratio of blade edge thickness to blade spacing variation, or a combination of one or more of the process parameters. Forming can include extruding the sheet onto a belt. The sheet can contact a surface of the belt after extruding through an open die. The belt can translate during extrusion. The extrusion height between the belt and a bottom surface of the die can be controlled. The extrusion height can be greater than zero. The mixture can be a gel formed for a ceramic powder material and a liquid. The gel can be characterized as a shape-stable material having the ability to hold a given shape even in the green (i.e., unfired) state. The gel can include a powder material that is an integrated network of discrete particles.
Keywords:
Shaped abrasive particle (SAP), polyhedron, pyramid, ellipsoid, sphere, prism, cylinder, cone, tetrahedron, cube, cuboid, rhomohedron, truncated pyramid, truncated ellipsoid, truncated sphere, truncated cone, pentahedron, hexahedron, heptahedron, aoctahedron, nonahedron, decahedron, Greek alphabet character, Latin alphabet character, Russian alphabet character, volcano shape, monostatic, gel, sectioning, sheet, alumina, ceramic, belt, extrude, extrusion, die, die surface, green, powder, network, discrete particles, moisture content.
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