Engis Corporation

Ion C Benea

Benjamin R Rosczyk

Ralph Doyle

Stephen Griffin

Laura Fitzgerald

Clement N Onyenemezu

A fixed abrasive three-dimensional plate includes micron size diamond beads or a mixture of abrasive particles and metal oxide beads, ranging in size from a few microns to a few tens of microns, incorporated into a matrix of one or more inorganic binders and fillers. The composition is formed into a rigid plate blank, and the abrasive plate is mounted on a substrate forming a lapping/polishing plate. The abrasive plate is capable of delivering high material removal rates coupled with reduced surface roughness when lapping/polishing advanced materials, including sapphire, titanium carbide reinforced alumina, silicon carbide, gallium nitride, aluminum nitride, zinc selenide, and other compound semiconductor materials, as well as, glass, ceramic, metallic, and composite workpieces. The diamond beads incorporated in the fixed abrasive three-dimensional plate include diamond particles ranging in size from a few nanometers to a few tens of microns, bonded with one or more inorganic binders and additives.

Fixed abrasive three-dimensional lapping and polishing plate and methods of making and using the same

A method is provided of etching a diamond particle including the step of heating the particle at a temperature of about 700&#xb0; C. or greater in the presence of water vapor to form an etched particle. Also provided is an etched particle having a core and a surface. The core is formed of sp3 hybridized carbon atoms covalently bonded together, and the surface has substantially no chlorine atoms, oxygen atoms or oxygen species.

Surface etched diamond particles and method for etching the surface of diamond particles

A method and apparatus are provided for measuring the crushing strength of an abrasive, comprising particles, used in a lapping process. Embodiments include a crushing strength tester having a cup for holding the abrasive; a first motor for rotating the cup in a first direction; a piston having a face for rotatably fitting within the cup and contacting the abrasive; a second motor for rotating the piston in a second direction opposite the first direction; and a press for pressing the piston against the abrasive and crushing the particles while the first and second motors are rotating. An initial particle size distribution for the particles is determined, then the abrasive is subjected to a crushing force approximately equal to that of the lapping process using the crushing strength tester. A post-crushing particle size distribution for the particles is determined, and the initial and post-crushing particle size distributions are compared.

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Wheeling, IL, United States of America

Ion C Benea