Abstract: A drill head having isostatically bonded therein the shank portions of hard, wear-resistant cutting elements. The drill head can include cutting elements of various shapes and contours. The varied shaped cutting elements result in additional resistance to forces encountered under operational conditions.

Abstract: A method is described for producing articles having a metal core, an intermediate powder metallurgy layer, and an exterior wear- and chip-resistant layer on the portions thereof requiring the same, which comprises:applying to a bearing metal core, powdered steel alloy containing about 3.5% nickel by weight by cold isostatic compaction in a compressible mold under a pressure of about 6000 atmospheres to provide an intermediate powder metallurgical layer having a density of about 90%;sintering said intermediate layer on said core in an atmosphere of hydrogen at about 1200.degree. C. for about one hour;applying a wear- and chip-resistant layer to selected portions of said sintered intermediate powder metallurgical layer by plasma spraying; andhot isostatically compacting the sprayed article in a thin-walled deep-drawn vessel of low carbon steel having a wall thickness of about 0.

Abstract: A drill bit with cutting teeth for drilling in rock comprising:a core member having raceways for rolling elements for rotation of the drill bit,a supporting layer exteriorly shaped to define cutting teeth and formed of highly compacted sintered powder material of substantially 90% density, isostatically bonded to said core member,a wear resistant layer applied by thermal spraying and covering only the portions of the cutting teeth which upon drilling directly contact the rock,said wear resistant layer and said supporting layer being isostatically compacted hot which combined are of substantially 99% density,said layers having a solid bond therebetween providing a drill bit of superior mechanical properties including high resistance to wear and chipping.

Abstract: A method for applying a dense, hard, adhesive and wear-resistant layer of cermets or cermic material on a metal object. A mixture of the hard cermet or ceramic material with a bonding metal is sprayed onto the metal object. A gas-tight metal foil is applied over the sprayed on coating and the metal foil and sprayed on coating are isostatically compressed onto the metal object. The metal foil is removed leaving a dense, hard, wear-resistant layer of cermets or ceramic material and bonding metal.

Abstract: The method of manufacturing such drill head by embedding the shank portions of hard, wear-resistant cutting elements in a mold containing metal powder, cold isostatically compacting the powder and shank portions to form the core part of the drill head, and hot isostatically compressing this core part to completely densify same.

Abstract: A roller bit for rock drilling comprising a body having at least one stub axle and a geared cutting element rotatably mounted on said stub axle. The stub axle and cutting element have confronting spaced raceways for a plurality of rolling elements. A shoulder is formed adjacent one end of the raceway in the stub axle to axially fix the rolling elements in one direction. A locking ring is mounted in the cutting element having an abutment shoulder confronting the opposite axial end faces of the rolling elements and axially fixing the rolling elements in a direction in the opposite direction. The locking ring has an outer cylindrical peripheral surface engaging in a complementary cavity in the cutting element adjacent the raceway surface therein. The locking ring has a seat for mounting a resilient sealing member engaging the stub axle adjacent the raceway therein connected in the mounted state to the stub axle.