摘要:
Three dimensionally large metallic structures comprised of submicron grain sizes are produced by a process which includes directing a supersonic powder jet against a substrate such that the powder adheres to the substrate and to itself to form a dense cohesive deposit. The powder jet may be comprised of refractory metal powders. The powder may be deposited by a supersonic jet and may be extruded by Equi channel angular extrusion.
摘要:
A high-strength, pre-coated, titanium or titanium-alloy material component is provided that includes a titanium or titanium-alloy material article having ultra-fine, submicron grain size microstructure and an organic coating of phenolic resin applied to the surface of the article. The article is prepared from a coarse grain titanium or titanium-alloy powder material that is cryomilled into an ultra-fine, submicron grain material, degassed, and densified. The densified material is formed or otherwise processed into a article, and pre-coated with an organic coating containing phenolic resin prior to installation or assembly.
摘要:
A mixed powder and a sintered body obtained by sintering the mixed powder. The mixed powder includes a solid-solution powder with complete solid-solution phase. The solid-solution powder includes a carbide or a carbonitride of at least two metals selected, including Ti, from metals of Groups IVa, Va and VIa of the periodic table, or a mixture thereof. A mixed cermet powder and a cermet obtained by sintering the mixed cermet powder are also disclosed. The mixed cermet powder includes at least a cermet powder with complete solid-solution phase. The cermet powder includes a carbide or a carbonitride of at least two metals selected, including Ti, from metals of Groups IVa, Va and VIa of the periodic table, or a mixture thereof, and at least one metal selected from the group consisting of Ni, Co and Fe. Also disclosed are a sintered body and a fabrication method of a cermet.
摘要:
A method of coating a substrate with cryo-milled, nano-grained particles includes forming a face-centered-cubic gamma matrix comprising nickel, cobalt, chromium, tungsten and molybdenum, adding a dispersion strengthening material to the gamma matrix to form a first mixture, cryo-milling the first mixture to form a second mixture to form a nano-grained structure, and cold spraying the second mixture onto a substrate to form a coating having a nano-grained structure.
摘要:
The invention relates to a cemented carbide material having a hard phase including tungsten carbide (WC) grains having an average grain size of 0.3 microns or less and also including cobalt (Co) as a bonding phase. The material also includes cobalt tungsten carbide grains that have a smaller average grain size than that of the tungsten carbide grains. The cemented carbide material has use, among others, in making cutting tools.
摘要:
Three dimensionally large metallic structures comprised of submicron grain sizes are produced by a process which includes directing a supersonic powder jet against a substrate such that the powder adheres to the substrate and to itself to form a dense cohesive deposit. The powder jet may be comprised of refractory metal powders. The powder may be deposited by a supersonic jet and may be extruded by Equi channel angular extrusion.
摘要:
A tool holder assembly and method for intentionally inducing modulation in a machining process. The tool holder assembly is configured for mounting in a tool block on a machining apparatus and includes a tool holder body configured to be secured to the tool block of the machining apparatus, a tool holder mounted on the tool holder body and configured for securing a cutting tool thereto, and a device for imposing a superimposed modulation on the tool holder so as to move the cutting tool relative to the tool holder body and thereby relative to the tool. The tool holder assembly is useful in a process for producing chips having a desired shape and size, and particularly to a method of controllably producing nanocrystalline chips.
摘要:
The iron-based rare-earth nanocomposite magnet of the present invention has a composition T100-x-y-z-nQxRyTizMn, where T is Fe or a transition metal element in which Fe is partially replaced by Co and/or Ni; Q is B and/or C; R is at least one rare-earth element including substantially no La or Ce; and M is at least one metal element selected from Al, Si, V, Cr, Mn, Cu, Zn, Ga, Zr, Nb, Mo, Ag, Hf, Ta, W, Pt, Au and Pb. x, y, z and n satisfy 5≦x≦10 at %, 7≦y≦10 at %, 0.1≦z≦5 at % and 0≦n≦10 at %, respectively. The magnet includes R2Fe14B-type compound phases and α —Fe phases forming a magnetically coupled nanocomposite magnet structure. The R2Fe14B-type compound phases have an average crystal grain size of 30 nm to 300 nm and the α —Fe phases have an average crystal grain size of 1 nm to 20 nm. The magnet has magnetic properties including a coercivity of at least 400 kA/m and a remanence of at least 0.9 T.
摘要:
An object of the present invention is to provide highly crystalline silver powder which is characterized in fine particles, showing high dispersibility, it's particle size distribution is not excessively sharp but relatively broad and crystallites are large; and a method for producing the same. In order to achieve the object, a method for producing highly crystalline silver powder is characterized in that mixing a first aqueous solution and a second aqueous solution, wherein the first aqueous solution contains silver nitrate, a dispersing agent and nitric acid, and the second solution contains ascorbic acid. For dispersing agent, polyvinylpyrrolidone or gelatin is preferred. Highly crystalline silver powder produced by the above-described method is preferred to be a crystallite diameter of 300 Å or more, an average particle diameter D50 in the range from 0.5 μm to 10 μm, and a thermal shrinkage rate for the length direction after heating at 700° C. in the range from −3% to 3%. For ratio D90/D10 of the silver powder is preferred to be in the range from 2.1 to 5.0.
摘要:
The invention provides an aqueous solution-based method for producing nanosized silver platelets, which employs the controlled mixing of a silver ion solution, a reducing solution, and an acidic solution in the presence of palladium ions.