Oriented particles in hard surfaces
OwnerEllis E. Robertsinventor
Life of this patent
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Abstract
An article having a hard surface of oriented particles for abrasive or wear-resistant applications is provided and includes a plurality of synthetic single crystals of diamond or cubic boron nitride, or like materials, oriented in a formation so that their corresponding crystallographic directions of maximum hardness, i.e., maximum abrasive resistance, are aligned, whereby the group of crystals, which form a working surface, exhibits a common direction of maximum hardness across the surface, and to a method of making such an article.
Claims16
An article of manufacture, comprising:
- a plurality of particles each having a predetermined directional line of maximum hardness,
- said particles being oriented in a formation so that all of said predetermined directional lines of maximum hardness are aligned in the same direction, and
- means holding the particles in said formation so that they can engage a workpiece while resisting displacement from the formation when there is relative movement between the workpiece and the particles.
An article having abrasive and wear-resistant qualities, comprising:
- a plurality of synthetic single crystals of the same material, of substantially the same size, and of polyhedral shape,
- each of said crystals having faces and edges and a predetermined axis of symmetry,
- said faces and edges constituting workpiece-engaging elements of the crystals, and
- means mounting the crystals in a formation in which their axes of symmetry are generally perpendicular to a common plane,
- each crystal having the same orientation about its axis of symmetry as all the other crystals and having ,one of its workpiece-engaging elements protruding from said common plane for contact with a workpiece.
An abrasive article, comprising:
- a backing member having a mounting surface,
- a group of synthetic single crystals secured to the backing member in spaced relationship and distributed about said mounting surface,
- each of said crystals being a polyhedron with side faces meeting in edges of the crystal, each crystal also having predetermined directions of hardness along lines in the plane of each face and tangential to each edge whereby said faces and edges constitute abrading portions of the crystals,
- the crystals being oriented on the backing member with a selected abrading portion of each crystal projecting outwardly from the mounting surface with all the corresponding lines of hardness being either in substantial alignment or substantial parallelism so that the group of crystals exhibits a common direction of hardness.
An article of manufacture having the qualities of abrasiveness and wear-resistance including a plurality of synthetic single crystals of substantially the same polyhedral shape and of substantially the same size, wherein each of said crystals has a workpiece-engaging portion having at least one crystallographic direction of hardness which has substantially the same direction and degree of hardness as the corresponding crystallographic direction of hardness in the workpiece-engaging portions of the other crystals, said crystals being oriented in a group said crystals being oriented in a group so that said corresponding crystallographic directions of hardness are aligned and so that the workpiece-engaging portions are positioned to collectively exhibit a common crystallographic direction of hardness and for collectively engaging a workpiece;
- and
- means for securing the crystals together in said oriented group.
An article of manufacture comprising a formation of synthetic single crystals each having a predetermined crystallographic direction of hardness, said crystals being held in the formation with said predetermined crystallographic directions oriented in the same direction, said formation being created by physically moving the crystals from disoriented positions into their oriented positions in said formation.
Dependencies are inferred from the claim text.