Abstract: The present invention includes a matrix powder system comprising one or more polycrystalline carbides, binderless carbides, or a combination thereof, a composite comprising the matrix powder system and a metal bond phase, a matrix bit body for a drill bit for oil and gas drilling made of this composite material, and a drill bit for oil and gas drilling comprising the matrix bit body and at least one cutter. The polycrystalline and/or binderless carbides may comprise carbides of W, Ti, V, Cr, Nb, Mo, Ta, Hf, Zr, or a combination thereof. The binderless carbides have less than 3 wt. % binder and the binderless and/or polycrystalline carbides may have a grain size of ?15 ?m and a hardness of ?1900 HV (0.5 kgf). Additional ceramic components and/or metals may also be present in the matrix powder system. Alternatively, the composite material may be present on only a portion of the matrix bit body surface.

Abstract: The present invention includes a matrix powder system comprising one or more polycrystalline carbides, binderless carbides, or a combination thereof, a composite comprising the matrix powder system and a metal bond phase, a matrix bit body for a drill bit for oil and gas drilling made of this composite material, and a drill bit for oil and gas drilling comprising the matrix bit body and at least one cutter. The polycrystalline and/or binderless carbides may comprise carbides of W, Ti, V, Cr, Nb, Mo, Ta, Hf, Zr, or a combination thereof. The binderless carbides have less than 3 wt. % binder and the binderless and/or polycrystalline carbides may have a grain size of ?15 ?m and a hardness of ?1900 HV (0.5 kgf). Additional ceramic components and/or metals may also be present in the matrix powder system. Alternatively, the composite material may be present on only a portion of the matrix bit body surface.

Abstract: An inner covering part for a vehicle is disclosed with a method for producing it. A two-dimensional, fluid-permeable metal structure is used and processed with a barrier layer for limiting penetration of additional or further layers through the metal structure.