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1309 results about "Amorphous metal" patented technology

An amorphous metal (also known as metallic glass or glassy metal) is a solid metallic material, usually an alloy, with disordered atomic-scale structure. Most metals are crystalline in their solid state, which means they have a highly ordered arrangement of atoms. Amorphous metals are non-crystalline, and have a glass-like structure. But unlike common glasses, such as window glass, which are typically electrical insulators, amorphous metals have good electrical conductivity. There are several ways in which amorphous metals can be produced, including extremely rapid cooling, physical vapor deposition, solid-state reaction, ion irradiation, and mechanical alloying.Previously, small batches of amorphous metals had been produced through a variety of quick-cooling method, such as amorphous metal ribbons which had been produced by sputtering molten metal onto a spinning metal disk (melt spinning). The rapid cooling (on the order of millions of degrees Celsius a second) is too fast for crystals to form and the material is "locked" in a glassy state. Currently, a number of alloys with critical cooling rates low enough to allow formation of amorphous structure in thick layers (over 1 millimeter) have been produced; these are known as bulk metallic glasses (BMG). More recently, batches of amorphous steel with three times the strength of conventional steel alloys have been produced .

Methods for forming amorphous ultra-high molecular weight polyalphaolefin drag reducing agents

A composition including polyalphaolefins that function as drag reducing agents and a process for the preparation of polyalphaolefins that function as drag reducing agents are disclosed. The process includes contacting alpha olefin monomers with a catalyst system, which includes a catalyst and an activator (co-catalyst) in a reactant mixture. The catalyst is a transition metal catalyst, preferably titanium trichloride, and the co-catalyst may include an alkylaluminoxane, alone or in combination, with a dialkylaluminum halide or a halohydrocarbon. The polymerization of the alpha olefin monomers produces a non-crystalline, ultra-high molecular weight polyalphaolefin having an inherent viscosity of at least 10 dL/g. The addition of the alkylaluminoxane during the polymerization process provides for a non-crystalline, ultra-high molecular weight polyalphaolefin and a more uniform molecular weight distribution of the resulting polyalphaolefin, thereby creating a drag reducing agent superior to known drag reducing agents. A process for forming a drag reducing agent comprising a non-crystalline, ultra-high molecular weight polyalphaolefin having an inherent viscosity of about at least 10 dL/g and a process for reducing drag in a conduit are also disclosed.
Owner:MPOWER SPECIALTY CHEM

Amorphous alloy diecasting equipment and amorphous alloy diecasting process

The invention discloses an amorphous alloy diecasting equipment and an amorphous alloy diecasting process. The amorphous alloy diecasting equipment comprises a fixed die, a movable die, a sealed bin, a protection-gas supplying device, a melting container, a pressing and ejecting cylinder, a driving device and a harmful-gas purifying device; the fixed die and the movable die can be opened and closed, and a die cavity is formed between the fixed die and the movable die in a defining way when the fixed die and the movable die are closed; a sealed chamber is formed in the sealed bin in a defining way, and the sealed bin is provided with a feeding opening; the protection-gas supplying device is connected with the sealed chamber and used for supplying a protection gas to the sealed chamber, wherein the protection gas in the sealed chamber is at positive pressure; the melting container is arranged in the sealed bin; the pressing and ejecting cylinder is communicated with the die cavity and provided with a melt inlet; the pressing and ejecting cylinder is internally provided with a pressing and ejecting piston used for ejecting the melted amorphous alloy into the die cavity; and the harmful-gas purifying device is connected with the sealed chamber and used for purifying the harmful gas in the sealed chamber. The amorphous alloy diecasting equipment disclosed by the embodiment of the invention has a simple structure, adopts the protective gas at positive pressure, does not need to establish a high vacuum degree and has low manufacturing and maintaining cost.
Owner:BYD CO LTD
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