Hardened cobalt alloys for forming jewelry, including finger rings as well as methods and processes for producing such alloys. In one illustrative embodiment, such an alloy can contain cobalt in an amount of from about 35 wt % to about 65 wt %, in combination with chromium in an amount of from about 16% wt to about 32 wt %, and molybdenum in an amount of from about 8 wt % to about 31 wt %. Aluminum, silicon, boron, titanium, and other hardness enhancing materials may also be present. Hot investment casting may be used to form items from the alloys, which may then be shaped or polished to a final form. Annular finger rings constructed from these materials may have a white appearance similar to white gold or platinum, may have increased resistance to scratching compared to traditional cobalt chromium rings, and may be easily be removed by cracking in an emergency situation.

Hardened cobalt alloys for forming jewelry, including finger rings as well as methods and processes for producing such alloys. In one illustrative embodiment, such an alloy can contain cobalt in an amount of from about 35 wt % to about 65 wt %, in combination with chromium in an amount of from about 16% wt to about 32 wt %, and molybdenum in an amount of from about 8 wt % to about 31 wt %. Aluminum, silicon, boron, titanium, and other hardness enhancing materials may also be present. Hot investment casting may be used to form items from the alloys, which may then be shaped or polished to a final form. Annular finger rings constructed from these materials may have a white appearance similar to white gold or platinum, may have increased resistance to scratching compared to traditional cobalt chromium rings, and may be easily be removed by cracking in an emergency situation.

A process for high integrity large thin-walled castings of metals and their alloys using a single downsprue includes the steps of providing at least a sand mold at desired elevated temperatures, delivering a molten metal into the mold, and supplying a predetermined amount of coolant to contact the surfaces of the casting at desired rates, times, and durations to achieve an acceptable level of progressive solidification from the distal end of the casting towards the riser until the casting has reached desired temperatures.

The kit of construction elements includes a plurality of construction elements and a plurality of rod-like binding elements for connecting said construction elements, wherein the construction elements are in the form of square-based rectangles, and wherein on at least one of the faces of each construction element perpendicular to the base thereof at least one groove is formed in parallel to its base, and along at least one edge of each construction element a groove is formed for receiving a binding element, wherein each binding element is formed to fit into a groove along at least a part of its entire length and further provided with securing members formed to engage with complementary securing members of said groove by form-fitting or force-fitting, and wherein the grooves of the construction elements and the binding elements are sized so that during use the construction elements are substantially in contact along their connecting surfaces.

Techniques are disclosed for casting high-strength and highly formable metal products from recycled metal scrap without the addition of substantial or any amounts of primary aluminum. Additional alloying elements, such as magnesium, can be added to metal scrap, which can be cast and processed to produce a desirable metal coil at final gauge having desirable metallurgical and mechanical properties, such as high strength and formability. Thus, inexpensive and recycled metal scrap can be efficiently repurposed for new applications, such as automotive applications and beverage can stock.

A nodular cast alloy, a casting made therefrom, and a production process therefor, which has a perlitic-ferritic microstructure for cast iron products and has a high strength combined with good ductility and toughness even in the cast state, including, as nonferrous constituents, C, Si, Ni, Mn, Cu, Mg, Cr, Al, P, S and normal impurities, characterized in that the nodular cast alloy in the cast state without subsequent heat treatment achieves a high static strength of a 0.2% offset yield strength of 600 MPa and a tensile strength of 750 MPa combined with good ductility of an elongation at break A5 of from 2 to 10%.

Provided is a catalyst suitable for curing a composite resin composition that includes comprising a blend of at least two tertiary amines selected from dimethylethylamine (DMEA), diethylmethylamine (DEMA), dimethylisopropylamine (DMIPA), and dimethyl-n-propylamine (DMPA), where each of the at least two tertiary amines is present in the blend in an amount of not less than 10% by weight and not more than 90% by weight.

Provided is a catalyst suitable for curing a composite resin composition that includes comprising a blend of at least two tertiary amines selected from dimethylethylamine (DMEA), diethylmethylamine (DEMA), dimethylisopropylamine (DMIPA), and dimethyl-n-propylamine (DMPA), where each of the at least two tertiary amines is present in the blend in an amount of not less than 10% by weight and not more than 90% by weight.

A method for obtaining a product made of titanium alloy or a titanium-aluminum intermetallic compound by plasma torch melting, the alloy having an oriented structure, the method including heating the molten alloy surface in a casting ring with a plasma torch; cooling a cold zone of the casting ring over a length L1, the cooling forming a semi-solid crown of alloy; heating a hot zone of the casting ring over a length L2, thereby forming a solidification front, the flatness of which relative to a plane perpendicular to a drawing direction is less than 10?; and drawing the solidified alloy at a speed of more than 10.sup.?4 m/s in the drawing direction. The present disclosure also relates to a plant having one or more devices for implementing the method.

Methods of manufacturing or repairing a turbine blade or vane are described. The airfoil portions of these turbine components are typically manufactured by casting in a ceramic mold, and a surface made up of the cast airfoil and at the least the ceramic core serves as a build surface for a subsequent process of additively manufacturing the tip portions. The build surface is created by removing a top portion of the airfoil and the core, or by placing an ultra-thin shim on top of the airfoil and the core. The overhang projected by the shim is subsequently removed. These methods are not limited to turbine engine applications, but can be applied to any metallic object that can benefit from casting and additive manufacturing processes. The present disclosure also relates to finished and intermediate products prepared by these methods.