Abstract: A composite cylinder for use in injection molding or extrusion operations, wherein a lining having excellent wear resistance and corrosion resistance is applied to the inside of an outer housing by a centrifugal casting process utilizing an alloy having tungsten-carbide particles in a nickel-chromium based alloy matrix. The casting alloy has a composition of up to about 57 weight percent tungsten carbide, with the balance a mixture of nickel and chromium and possibly minor amounts of other elements, but without any significant amount of cobalt. Particularly satisfactory results are obtained from an alloy having a composition by weight of 46-57 percent tungsten carbide, 28-40 percent nickel, 5.1-9.5 percent chromium, 1.5-2.9 percent iron, 1.5-2.9 percent silicon, 1.0-2.3 percent boron and 0.5 percent maximum carbon, the total of constituents being 100%.

Abstract: A method of fabricating a rock bit insert which has improved wear characteristics is disclosed. Selected surfaces of the insert are implanted with a harder grade of tungsten carbide and sintered thereto. The special insert then would find application in the gage row of, for example, a roller cone rock bit.

Abstract: A die (10, 40) for extrusion of optical grade fibers includes an insert (12, 42) placed under compression within a sleeve (14, 44). Tapered surfaces (18, 20 & 48, 50) between the insert and the sleeve enable axial assembly of the components when the insert is forced within the sleeve. Lubrication and interlocking between the components comprise either general lubricant and an interlocking ring (30) residing within grooves (26, 28) in the tapered surfaces, or a metal (60) which provides first a lubrication during assembly of the components and then a metallurgical diffusion bond therebetween.

Abstract: A ceramic cutting tip which is applicable to a cutting tool of a lathe, a milling machine and the like is disclosed. The ceramic cutting tip comprises a ceramic sintered body including at least a cutting blade portion covered with a metal coating having a thickness of 1-10 .mu.,wherein the metal employed in the metal coating is selected from the group consisting of nickel, cobalt, aluminum and copper.

Abstract: The rock cutting tip insert of a rock cutting tool comprises two layers, the front layer being harder than the backing or base layer by at least one hundred units on the Vickers Hardness scale.

Abstract: A coated steel product, namely, a cutting instrument such as a band saw blade, in which the body of the blade is of steel, the tooth tip is of impulse hardened steel and the tip is covered with a coating of titanium carbide or refractory metal carbide, the coating metal or compound having been deposited by ion plating onto the surface of the tip. The process through which the cutting tool is produced includes preshaping and sharpening the tool, then ion cleaning the tips, bombarding the tips with ions of the titanium or refractory metal followed by reacting the titanium or refractory metal with a carbon containing chemical or their carbides and then simultaneously subjecting both the coating and the steel tip to a magnetic flux for impulse hardening primarily the steel tip. Other coatings of metal carbides, nitrides, borides and metal compounds are described.

Abstract: A multi-material earthworking ripper tip having a leading nose portion comprised of a material having greater wear resistance and strength at elevated temperatures than the material which comprises the rearward shank supporting portion of the tip. In one embodiment, a bi-metallic nose portion is inertial welded to the shank support portion of the tip. In another embodiment powdered tungsten carbide is sintered in situ within a hollow bore of a steel nose portion. Alternately, a solid core of tungsten carbide could be soldered, brazed or press fitted within said hollow bore.

Abstract: A method for producing a cutting face from a hard cutting material for engineer's tools comprising, essentially, presenting the metal stock to a feed slot within a forming core, heating the same to its deformation temperature and then forcing now deformed stock through said forming core into the desired shape. A helical cutting face produced by such method having a length greater than one-third its total lead; a helix angle in the range of 10.degree.-45.degree.; being of a length of one and one-half inches upward depending upon the particular tool requirement; and being of any desired cross-section.