A peripheral grinding wheel wherein the peripheral grinding portion contains diamond or cubic boron nitride abrasive particles and is characterised in that it consists of two co-axial sections, the one section being a coarse section and containing coarse particles of between 60/80 mesh and 100/120 mesh and the other being a fine section containing fine particles of between 170/200 and 300/350 mesh, or in that it consists of a fine section sandwiched between two coarse sections, in each case the ...

A batsman box surface made of hard automobile tire-like black rubber in official sizes is placed flush with the playing surface and staked in place. White foul lines are molded or added to the surface. The whole surface fits into the regulation 26 foot dirt circle when placed in alignment with the baseball field diamond boundaries. The batsman box comprises a pair of spaced apart generally oblong plate portions connected by a catchers plate located generally behind and between the batsman plates...

Diamond microtip field emitters are used in diode and triode vacuum microelectronic devices, sensors and displays. Diamond diode and triode devices having integral anode and grid structures can be fabricated. Ultra-sharp tips are formed on the emitters in a fabrication process in which diamond is deposited into mold cavities in a two-step deposition sequence. During deposition of the diamond, the carbon graphite content is carefully controlled to enhance emission performance. The tips or the emi...

A cutting tip for a diamond tool and a diamond tool having the same which serve to cut or perforate various brittle materials such as stone, brick, concrete and asphalt. In particular, the cutting tip for a diamond tool and the diamond tool have diamond particles which are suitably arrayed to improve the cutting rate. A cutting tip for a diamond tool having diamond particles which are distributed in the cutting tip, wherein the diamond particles are inclined in respect to a cutting direction in ...

The present invention provides films and substrates coated with films that comprise a nano-crystalline diamond matrix that is substantially free of graphite inclusions. The present invention also provides a method of chemical vapor deposition to prepare the films. The method of chemical vapor deposition operates at a DC bias voltage that substantially precludes the formation of a plasma ion capable of causing a region of a nano-crystalline diamond matrix within a forming film to allotrope when t...

Disclosed herein is a method for joining a diamond to a metal shank by means of a two stage process in which the diamond is first adhered to a metal blank, using a gold-tantalum or gold-niobium alloy, and then the composite structure is adhered to the metal shank using a different bonding material.

In a signal scanner for the scanning of signals stored on an information carrier which is moving with a velocity relative to the signal scanner, an element including a diamond adapted at least for guiding the signal scanner by following a groove, which diamond has at least one part of its bounding surfaces selected from the natural crystal surfaces of diamond, on which part the crystallographic orientation of the diamond is recognizable.

To synthesize diamond a carbonaceous material in the presence of metals, such as zinc, magnesium, lead, cadmium, bismuth, tin, indium, antimony, thallium, aluminium, mercury and compounds thereof is subjected to a pressure of at least 60 kbar at a temperature of at least 1700.degree.C within the range of diamond stability.

Disclosed herein is a unique carrier for mounting on a rotatable spindle an annular saw blade possessing a cutting edge on its inner periphery and a plurality of annularly distributed mounting holes. The carrier includes a chuck for mounting on the spindle and for clamping the blade to the chuck. Formed in the annular clamp are a plurality of screw holes disposed for alignment with others of the mounting holes. The screw holes are threaded to receive mounting screws and have minimum diameters sm...

A polycrystalline diamond composite and method having diamond to diamond bonds formed between adjacent diamond particles. The composite is produced by mixing diamond particles with a sintering aid and creating direct diamond to diamond bonds under temperature and pressure conditions at which diamond is normally unstable.