Abstract: A method of cladding an internal cavity surface of a metal object is disclosed. The method includes the steps:(a) applying a powder metal layer on said internal surface, the metal powder including metal oxide or oxides, borides and carbides,(b) filling a pressure transmitting and flowable grain into said cavity to contact said layer,(c) and pressurizing said grain to cause sufficient pressure transmission to the powder metal layer to consolidate same.

Abstract: A method of cladding an internal cavity surface of a metal object is disclosed. The method includes the steps:(a) applying a powder metal layer on said internal surface, the metal powder including metal oxide or oxides, borides and carbides,(b) filling a pressure transmitting and flowable grain into said cavity to contact said layer,(c) and pressurizing said grain to cause sufficient pressure transmission to the powder metal layer to consolidate same.

Abstract: The method of forming a cutter, which includes a core and a wear resistant insert defining a body means which includes(a) applying to the body means a mixture of:(i) wear resistant metallic powder, and(ii) binder(b) volatilizing the binder,(d) and applying pressure to the body means and powdered metal, at elevated temperature to consolidate same.

Abstract: A method of cladding an internal cavity surface of a metal object is disclosed. The method includes the steps:(a) applying a powder metal layer on said internal surface, the metal powder including metal oxide or oxides, bordides and carbides,(b) filling a pressure transmitting and flowable grain into said cavity to contact said layer,(c) and pressurizing said grain to cause sufficient pressure transmission to the powder metal layer to consolidate same.

Abstract: A roller bit cutter comprises:(a) a tough, metallic generally conical and fracture resistant core having a hollow interior, the core defining an axis,(b) an annular metallic radial bearing layer carried by said core at the interior thereof to support the core for rotation, said bearing layer extending about said axis,(c) an impact and wear resistant metallic inner layer on the core, at the interior thereof, to provide an axial thrust bearing, and(d) hard metallic inserts having anchor portions carried by the core and partly embedded therein, the inserts protruding outwardly at the exterior of the core to define cutters, at least some of the inserts spaced about said axis,(e) and a wear resistant outer metallic layer on the exterior of said core.

Abstract: A roller bit cutter comprises a tough, metallic, generally conical and fracture resistant core having a hollow interior, the core defining an axis; an annular, metallic, radial bearing layer carried by the core at the interior thereof to support the core for rotation, the bearing layer extending about the core axis; a wear resistant outer metallic layer on the exterior of the core; metallic teeth integral with the core and protruding outwardly therefrom, at least some of the teeth spaced about the axis; and an impact and wear resistant layer on each tooth to provide hard cutting edges as the bit cutter is rotated about the core.

Abstract: A roller bit cutter comprises:(a) a tough, metallic, generally conical and fracture resistant core having a hollow interior, the core defining an axis,(b) an annular, metallic, radial bearing layer carried by said core at the interior thereof to support the core for rotation, said bearing layer extending about said axis,(c) a wear resistant outer metallic layer on the exterior of the core,(d) metallic teeth integral with the core and protruding outwardly therefrom, at least some of said teeth spaced about said axis,(e) and an impact and wear resistant layer on each tooth to provide hard cutting edges as the bit cutter is rotated about said axis.

Abstract: A method of consolidating metallic body means comprises(a) applying to the body means a mixture of:(i) metallic powder(ii) fugitive organic binder(iii) volatile solvent(b) drying the mixture, and(c) burning out the binder and solvent at elevated temperature,(d) and applying pressure to the powdered metal to consolidate same on said body means.

Abstract: A self-sharpening rotary drag bit assembly comprises:(a) a carrier body adapted to be rotated about a first axis, and having a drilling end,(b) cutters carried by the body to be exposed for cutting at the drilling end of the body, the cutters having thereon layers of hard materials defining cutting edges to engage and cut the drilled formation as the body rotates, the cutters also including reinforcement material supporting said layers to resist deflection thereof under cutting loads,(c) said body and said reinforcement material being characterized as abradable by the formation as the bit drilling end rotates in engagement with the formation.