Abstract:
A super hard polycrystalline construction comprises a body of polycrystalline super hard material, said body having an exposed working surface. The body of polycrystalline super hard material comprises a first region adjacent the working surface and a second region adjacent the first region; the first region being more thermally stable than the second region; and a plurality of apertures or channels, one or more of said apertures or channels extending from the exposed working surface of the body into the second region.
Abstract:
A super hard polycrystalline construction comprises a body of polycrystalline super hard material, said body having an exposed working surface, a substrate attached to the body of polycrystalline super hard material along an interface and a plurality of apertures or channels (50). One or more of said apertures or channels extend(s) from the exposed working surface of the body into the substrate.
Abstract:
A polycrystalline super hard construction has a first region comprising a body of thermally stable polycrystalline super hard material having an exposed surface forming a working surface, and a peripheral side edge, said polycrystalline super hard material comprising a plurality of intergrown grains of super hard material; a second region forming a substrate to the first region, the second region comprising a hard phase and a binder phase; and a third region interposed between the first and second regions, the third region extending across a surface of the second region along an interface. The third region comprises a composite material having a first phase comprising a plurality of non-intergrown grains of super hard material, and a matrix material. The super hard polycrystalline construction further has a fourth region interposed between the second region and the third region, a major proportion of the fourth region comprising one or more components of the binder material of the second region, the fourth region further comprising one or more reaction products between the binder material of the second region and one or more components of the third region.
Abstract:
A method of manufacturing a polycrystalline abrasive construction comprises providing a plurality of particles of a superhard material, the particles coated with a first matrix precursor material, providing a plurality of second matrix precursor particles having an average size less than 2 micron, the second matrix precursor particles including a liquid phase sintering agent, mixing together the plurality of particles of superhard material with particles of the second matrix precursor material and consolidating and sintering the particles of superhard material and the particles of matrix precursor material.A polycrystalline abrasive construction comprises a particles of a superhard material dispersed in a matrix material comprising a material derived from a liquid phase sintering aid and chemical barrier particles having an average particle size of less than 100nm dispersed in the matrix. Greater than 50% of the chemical barrier particles are located substantially at boundaries between superhard particles and the matrix.
Abstract:
A method of forming a super hard polycrystalline construction comprises forming a liquid suspension of a first mass of nano-ceramic particles and a mass of particles or grains of super hard material having an average particle or grain size of 1 or more microns, dispersing the particles or grains in the liquid suspension to form a substantially homogeneous suspension, drying the suspension to form an admix of the nano-ceramic and super hard grains or particles, and forming a pre-sinter assembly comprising the admix. The pre-sinter assembly is then sintered to form a body of polycrystalline super hard material comprising a first fraction of super hard grains and a second fraction, the nano-ceramic particles forming the second fraction. The super hard grains are spaced along at least a portion of the peripheral surface by one or more nano-ceramic grains, the super hard grains having a greater average grain size than that of the grains in the second fraction which have an average size of less than around 999nm.