Abstract:
L'invention concerne un procédé de mise en forme d'un alliage comprenant principalement du Ti en phase β ou proche b, comprenant les étapes de : - préparation d'un mélange homogène de poudre de particules comprenant des particules micrométriques de Ti pur et des particules nanométriques d'au moins un élément additionnel ou composé favorisant la phase béta du Ti lors de son refroidissement à partir de sa température de transition de phase a/b - exposition dudit mélange de poudre de particules à une source d'énergie focalisée qui vient chauffer sélectivement au moins une partie d'un lit dudit mélange homogène de poudre à une température comprise entre 850 et 1850°C refroidissement de la partie ayant subi cette exposition avec conservation de la phase b du Ti.
Abstract:
An additive manufacturing method may involve: Providing a first and a second material, the second material capable of reacting with the first material to form a reaction product; forming at least the first material into a first layer; subjecting at least a portion of the first layer to energy in the presence of the second material, the energy being sufficient to initiate a reaction between the first and second materials to form a portion of the article, the portion of the article comprising the reaction product; forming a second layer of at least the first material on the first layer; and subjecting at least a portion of the second layer to energy in the presence of the second material, the energy being sufficient to initiate a reaction between the first and second materials to form an additional portion of the article.
Abstract:
L'invention concerne notamment un alliage intermétallique à base de titane comportant, en pourcentages atomiques, 16 % à 26% d'AI, 18 % à 28% de Nb, 0 % à 3% d'un métal M choisi entre Mo, W, Hf, et V, 0 % à 0,8% de Si, 0 % à 2% de Ta, 1 % à 4% de Zr, avec la condition Fe+Ni
Abstract translation:本发明涉及一种基于钛的金属间合金,其原子百分比包含16%至26%之间的Al,18%至28%之间的Nb,0%至3%之间的金属M,选自Mo,W ,Hf和V,0%和0.8%之间的Si,0%到2%之间的Ta,1%到4%的Zr,条件Fe + Ni <400ppm,其余的是Ti, Al / Nb比的原子百分比在1.05和1.15之间的合金。
Abstract:
A composite particle comprises a core, a shielding layer deposited on the core, and further comprises an interlayer region formed at an interface of the shielding layer and the core, the interlayer region having a reactivity less than that of the core, and the shielding layer having a reactivity less than that of the interlayer region, a metallic layer not identical to the shielding layer and deposited on the shielding layer, the metallic layer having a reactivity less than that of the core, and optionally, an adhesion metal layer deposited on the metallic layer, wherein the composite particles have a corrosion rate of about 0.1 to about 450 mg/cm 2 /hour using an aqueous 3 wt% KCl solution at 200°F. An article comprises composite particles, wherein has a corrosion rates of about 0.1 to about 450 mg/cm 2 /hour using an aqueous 3wt% KCl solution at 200°F.
Abstract translation:复合颗粒包括芯,沉积在芯上的屏蔽层,并且还包括形成在屏蔽层和芯的界面处的层间区域,所述层间区域具有小于芯的反应性,并且屏蔽层 具有小于层间区域的反应性的反应性,与屏蔽层不同并沉积在屏蔽层上的金属层,金属层具有小于芯的反应性的反应性,以及任选的沉积在该层上的粘附金属层 金属层,其中复合颗粒在200°F下使用3重量%KCl水溶液具有约0.1至约450mg / cm 2 /小时的腐蚀速率。 一种制品包括复合颗粒,其中在200°F下使用3wt%KCl水溶液具有约0.1至约450mg / cm 2 /小时的腐蚀速率。
Abstract:
A method for manufacturing a fuel contacting component that facilitates reducing coke formation on at least one surface of the fuel contacting component is disclosed herein. The method includes applying a slurry composition including a powder including aluminum to the component surface, wherein the fuel contacting component is formed by an additive manufacturing process. The slum' composition is heat treated to diffuse the aluminum into the component surface. The heat treatment comprises forming a diffusion aluminide coating on the component surface, wherein the diffusion coating comprises a diffusion sublayer formed on the component surface and an additive sublayer formed on the diffusion sublayer. The method further comprises removing the additive sublayer of the diffusion aluminide coating with at least one aqueous solution such that the diffusion sublayer and the component surface are substantially unaffected, wherein the diffusion layer facilitates preventing coke formation on component surface.
Abstract:
A discontinuously reinforced metal matrix composite wherein the reinforcing material is a particulate binary intermetallic compound is described along with methods for preparing the same. The binary intermetallic compound includes the same type of metal as is the principal matrix metal in combination with one other metal. The particle size of the particulate binary intermetallic compound may be less than about 20 µm and may be between about 1 µm and about 10 µm. The intermetallic particles may be present in the discontinuously reinforced metal matrix composites in an amount ranging from about 10% to about 70% by volume. The discontinuous reinforced metal matrix composites of the invention may be used in structures requiring greater strength and stiffness than can be provided by matrix metal alone. The materials of the invention may be used for vehicle parts, structural materials, and the like.
Abstract:
Disclosed herein are superconducting wires. The superconducting wires can comprise a metallic matrix and at least one continuous subelement embedded in the matrix. Each subelement can comprise a non-superconducting core, a superconducting layer coaxially disposed around the non-superconducting core, and a barrier layer coaxially disposed around the superconducting layer. The superconducting layer can comprise a plurality of Nb3Sn grains stabilized by metal oxide particulates disposed therein. The Nb3Sn grains can have an average grain size of from 5 nm to 90 nm (for example, from 15 nm to 30 nm). The superconducting wire can have a high-field critical current density (J c ) of at least 5,000 A/mm2 at a temperature of 4.2 K in a magnetic field of 12 T. Also described are superconducting wire precursors that can be heat treated to prepare superconducting wires, as well as methods of making superconducting wires.
Abstract translation:这里公开了超导线。 超导线可以包括金属基体和嵌入基质中的至少一个连续子元件。 每个子元件可以包括非超导芯,同轴地设置在非超导芯周围的超导层,以及同轴地设置在超导层周围的阻挡层。 超导层可以包括由设置在其中的金属氧化物颗粒稳定的多个Nb 3 Sn颗粒。 Nb 3 Sn粒子的平均粒径可以为5nm〜90nm(例如15nm〜30nm)。 在12T的磁场中,超导线可以在4.2K的温度下具有至少5,000A / mm 2的高场临界电流密度(J c)。还描述了可以进行热处理以制备的超导线前体 超导线,以及制造超导线的方法。
Abstract:
A method for forming a densified solid object corresponding to a thermoelectric element from a mixture of uncompressed, powdered constituent materials. A powdered precursor material may be selected to cause a shrinkage of at least twenty percent in at least two mutually orthogonal linear dimensions of a densified solid object compared to corresponding dimensions of a mold cavity. In some embodiments, a precursor material is selected to produce a thermoelectric material having electrical and mechanical properties suitable for a thermoelectric module. In some embodiments, at least two thermoelectric elements are electrically connected to conductive plates to form a thermoelectric module.