A mass of diamond crystals in contact with a mass of eutectiferous silicon-rich alloy are disposed in a container and placed within a pressure transmitting powder medium. Pressure is applied to the powder medium resulting in substantially isostatic pressure being applied to the container and its contents sufficient to dimensionally stabilize the container and its contents. The resulting shaped substantially isostatic system of powder-enveloped container is hot-pressed whereby fluid eutectiferous...

Abrasive particles are prepared by milling diamond particles, metal compound and milling balls to smear a coating of the compound on the diamond particles and firing the compound-coated diamond particles producing a rough granular adherent covering of metal and/or metal carbide surface coating chemically bonded to the diamond surface by metal carbide.

The present invention describes a novel abrasive tool that contains abrasive particles distributed in a predetermined pattern. Such a pattern is produced by fabricating two-dimensional slices and subsequently assembling and consolidating them into a three-dimensional tool. Abrasive particles 20 may be incorporated during the process of making these two-dimensional slices, or they may be planted afterwards into these slices 100 that contains matrix powder. In the latter case, the planting may be ...

Thermally stable diamond constructions comprise a diamond body having a plurality of bonded diamond crystals, a plurality of interstitial regions disposed among the crystals, and a substrate attached to the body. The body includes a working surface and a side surface extending away from the working surface to the substrate. The body comprises a first region adjacent the side surface that is substantially free of a catalyst material and that extends a partial depth into the diamond body. The firs...

The method of making a diamond product in accordance with the present invention comprises the steps of forming a diamond substrate (50) with a mask layer (52), and etching the diamond substrate (50) formed with the mask layer (52) with a plasma of a mixed gas composed of a gas containing an oxygen atom and a gas containing a fluorine atom, whereas the fluorine atom concentration is within the range of 0.04% to 6% with respect to the total number of atoms in the mixed gas.

A diamond with molybdenum bonded or linked thereto comprises a diamond structure subjected to a pre-sputtering process by causing gaseous ions to impinge on a selected portion of its surface, and molybdenum bonded to said diamond structure, which has been subjected to said pre-sputtering process, by a sputtering process, forming a molybdenum film of 10 to 50 A in thickness bonded or linked with the diamond and which cannot be dissolved with hydrogen peroxide. The diamond may be in the shape of a...

An adherently bonded polycrystalline diamond body is produced by forming a charge composed of a mass of diamond crystals in contact with a mass of eutectiferous silicon-rich alloy wherein the alloy is in contact or in association with hexagonal boron nitride, confining such charge within a reaction chamber, subjecting the confined charge to a pressure of at least 25 kilobars, heating the pressure-maintained charge to a temperature sufficient to melt the alloy and at which no significant graphiti...

A diamond drill bit construction for drilling bores in earth formations and the like, according to the present invention, comprises a drill body that is adapted for connection thereof with a drill stem and defines internal fluid passage means through which drilling fluid flows during drilling operations. A plurality of spaced stabilizer pads are formed on the drill body defining a portion of the external surface area thereof and defining a plurality of fluid courses between adjacent stabilizer p...

Playing cards are disclosed having a unique diamond shape that facilitates the handling and display of the cards. A three-letter sequence is imprinted centrally on the front face of each card, the letters forming a natural alphabetic sequence. The second letter in the sequence is also imprinted near the upper and lower corners of each card in mutually inverted orientations so as to be readily visible and recognizable from either end of the card. The cards are divided into four suits such as diam...

A method for manufacturing a diamond tool having a shank, comprising accurately arranging a diamond chip on an upper surface of a base body in such a manner that the cutting edge of the chip projects from the end of the body by a predetermined distance, provisionally securing the chip to the upper surface of the body by means of an adhesive, fitting the body and an insert having an exposed clayish fixture in a U-shaped channel of a lower die to penetrate and position the cutting edge portion of ...