Abstract: A process for increasing the resistance to wear of the surface of hard metal parts subject to wear, such as a cutting blade of metal cutting tools, and the product which results from the process, which includes coating the surface of the hard metal, for example, cemented carbide articles with a first layer comprised of one or more layers of a metallic carbide or nitride in a total thickness ranging from 0.01 to 10 .mu.m, a second layer comprised of one or more layers of a refractory oxide, such as an oxide of aluminum, zirconium, silicon, calcium, magnesium, titanium, and hafnium, and stabilized zirconium oxide in a total thickness ranging from 0.5 to 10 .mu.m, and depositing over the refractory oxide coating a third layer comprised of one or more layers of a nitride, carbonitride, oxynitride, oxycarbide or oxycarbonitride and boride of such metals as titanium, zirconium, hafnium, aluminum and silicon in a total thickness ranging from 1 to 10 .mu.m.

Abstract: During the method of preparing tantalum powder from a tantalum rich solution in an organic solvent in which a tantalum salt is precipitated from the tantalum rich solvent and the tantalum salt is reduced to metalic tantalum by an alkali metal, a phosphorus-containing material is added to either the precipitated step or the reduction step or both.

Abstract: A heat exchange assembly which utilizes a central source of a heated fluid, such as steam, and serves as a hot fluid distribution center for a plurality of satellite chambers removably disposed on a supporting rack around the source. Each satellite chamber, arranged in series with the others, receives the hot fluid at one end from the central source and discharges condensate at the other end. Longitudinal pipes in the satellite chamber of the cluster carry the fluid to be processed through the chambers. The series piping permits flow to be reversed in the satellite chambers to even out the deterioration of each chamber.

Abstract: Stainless steel castings having an as-cast hardness of Rockwell B82 to 98, good ductility and high notch toughness, and consisting by weight of 13-19% of Cr, 2.0-3.6% of Ni and 2.0-3.5% of Cu with the sum of Ni plus Cu of at least 5.0%, 0.20-1.4% of Mn, 0.5-1.0% of Si, 0.035% max. of P, 0.035% max. of S, less than 0.10% of Mo, less than 0.10% of Cb, less than 0.10% of Al, 0.20-80% of C when the N is 0.05% max. and 0.10-60% C when the N is 0.05-0.10%, and balance essentially of Fe and any conventional impurities.

Abstract: A drill steel and method of making the drill steel which includes a tube which is opened up at one end by a first punch strike after which a male insertion element with external indentations is mounted on a second punch and driven partially into the opened end of the drill steel while simultaneously striking the drill steel at the end to collapse the walls of the tube around the element and into the indentations to lock the element in the tube. The finished drill steel thus has a male end to insert telescopically into the end of a similar steel to provide necessary extension devices.

Abstract: An improved brazed construction and method for fabrication of equipment having a corrosion resistant liner on a base metal backing is disclosed, and involves incorporating symmetrical convolutions in the liner normal to the direction of maximum thermal expansion.

Abstract: An adjustable multiple blade boring bar with diametrically disposed overlapping blade blocks, each adjustable in and out and a control cartridge having actuator pins movable in opposite directions in response to rotation of a differential screw, the pins being oriented in relation to slots on the blade block to move in a camming relationship to shift the blocks in and out. A differential screw associates the control cartridge and the boring bar to permit radial equalization of the blade block when installed initially or after sharpening.

Abstract: An electrical contact material which is particularly well suited for use in circuit breaker switches consisting essentially of silver in the amount of about 20% to 50% by weight, nickel in the amount of about 2% to 13% by weight, phosphorous in the amount of about 90 ppm to 1000 ppm, and the remainder tungsten. In one embodiment of the contact material forming method provided by the invention, starting particle sizes and liquid phase sintering parameters are selected to yield a relatively coarse grain size in the contact material microstructure with an optimum combination of resistance to oxidation, electrical erosion and distortion associated with high-current interruptions.

Abstract: A cutting insert, especially for milling cutters or the like, which is receivable in a holder and which insert has linear edge portions which meet at the corners of the insert. The insert is indexable in the holder to present a selected edge to work to be done. Each of the edges of the inserts are serrated or notched with respective edges embodying different numbers of serrations or notches so that the inserts can be arranged in the holder to cut completely across a surface with each insert taking only a portion of the surface.

Abstract: A micro-adjustable boring bar with an interchangeable head and cartridge utilizing a micro-adjustable key and a stationary key with an adjustment screw mounted independently on a boring bar, and a replaceable and interchangeable head having a recess for the adjustable key and a slot for the stationary key, the slots in both the boring bar and the head being open ended for easy machining.

Abstract: A tool holder for grooving and parting machining operations and the like having a cutting insert received on a support plate carried by a tool body. Recesses in the bottom and rear edges of the support plate bear on support pins pressed into the body and the support plate is retained in engagement with the pins and a side face of the body by a screw extending through a hole in the plate and threaded into the body. A clamp carried by the body bears on the cutting insert to retain the insert in a seat on the plate.

Abstract: Tantalum and tantalum-rich alloys, particularly in wire form, are stabilized against embrittlement by the addition of 50 to 700 parts per million of silicon and optionally with the further addition of 100 to 500 parts per million of carbon.

Abstract: A process for recovering metal carbide powders from cemented carbides containing a metal binder phase by anodic dissolution of the binder phase under controlled electrochemical potential and current density conditions to produce a greatly accelerated rate of dissolution of the binder phase without significant dissolution of the metal carbide grains.

Abstract: A tool holding device for holding a cylindrical barrel in a cylindrical chamber which includes a two-part barrel with the parts axially oriented having facing chamfers to form a V-groove which receives a split ring. The retaining barrel has a rearwardly facing shoulder which form an annular abutment for the periphery of the ring when the ring is expanded by drawing the parts of the barrel axially toward each other.

Abstract: An adjustable boring bar with a boring head which can be locked, released, readily adjusted radially, removed from the basic bar, replaced in the same position of adjustment and relocked. The boring bar has a self-contained locking device and adjustable index block which cooperate to permit quick disassembly and replacement.

Abstract: The invention relates to a cutting tool especially useful for cut-off, threading and grooving operations. The tool includes a massive block-like body with serrations along one or both sides. An adjustable plate with interengaging complemental serrations is mounted on the side of the body and retained by bolts which transfix the plate and anchor in the body. The plate has a top recess to receive short cutting elements backed up by a similarly shaped rod. A broached out-of-round hole is cut into the body parallel to the serrated wall to receive at one end a threaded anchor nut and at the other end a shank of a clamp bar.

Abstract: A toolholder comprising a body having a segmental shaped recess at one end in which is secured a correspondingly shaped carrier or insert anvil provided with a tool bit accommodating pocket in which an indexable tool bit is adapted to be received, the carrier having a cylindrical depending portion received in a corresponding circular recess in the toolholder to positively locate the carrier when clamped in the recess with a headed screw or top clamp.

Abstract: A heavy duty, indexable insert for use in single-point and multiple-point negative rake holding devices, which includes a polygonal body having conjunctive sides providing cutting edges bounding a flat, narrow, downwardly inclined land which drops off sharply into a wide pocket which inclines at a very low angle to the center or axis of the insert and also narrows in width from the corners of a particular edge to center.

Abstract: A finishing tool for resurfacing railroad axles which incorporates a flat diamond-shaped insert with a short chip indentation in the flat top surface near the cutting corner and adjacent one side to control cuttings.

Abstract: A heavy duty insert for severe machining operations having a generally rectangular body with upstanding walls and rounded corners having a cutting edge extending around the periphery thereof and an upstanding mesa inboard of the cutting edge. To provide improved machining life the cutting edge in cross-section has an arcuate surface with a small radius merging from the walls of the body into an inclined face which is intersected inwardly of the walls by a flat land extending transversely to the walls. The maximum cutting speed and in-feed rate for machining is significantly increased by a groove interposed between the mesa and a cutting edge adjacent each side wall and having a first portion extending inwardly of and downwardly below the land of the cutting edge and a second portion defining in cooperation with a side wall of the mesa a surface extending inwardly of and upwardly above the land of the cutting edge.