Abstract:
Die vorliegende Erfindung betrifft eine Vanadiumlegierung mit 2 bis 35 At.% Silizium und 3 bis 50 At.% Bor, die auch bei höheren Temperaturen oxidationsbeständig ist und insbesondere für die Herstellung von hochtemperaturbeanspruchten Bauteilen geeignet ist.
Abstract:
A metal matrix composite material includes a reinforcement phase dispersed in an aluminum or aluminum alloy matrix. The reinforcement phase includes particles having an average particle size (D50) of from 0.1 µm to 0.5 µm.m.
Abstract:
A syntactic metal foam composite that is substantially fully dense except for syntactic porosity is formed from a mixture of ceramic microballoons and matrix forming metal. The ceramic microballoons have a uniaxial crush strength and a much higher omniaxial crush strength. The mixture is continuously constrained while it is consolidated. The constraining force is less than the omniaxial crush strength. The substantially fully dense syntactic metal foam composite is then constrained and deformation worked at a substantially constant volume. The deformation working is typically performed at a yield strength that is adjusted by way of selecting a working temperature at which the yield strength is approximately less than the omniaxial crush strength of the included ceramic microballoons. This deformation causes at least work hardening and grain refinement in the matrix metal.
Abstract:
The invention relates to a method for manufacturing a metal, ceramic, or composite part (PF) by flash sintering, which comprises simultaneously applying, inside a die (M), a uniaxial pressure and an electric current to a device containing a powder constituent material, said uniaxial pressure being applied by means of at least two pistons (P1, P2) which slide toward one another inside said die and each of which has a bearing surface (F1, F2) contacting said material, said bearing surfaces engaging so as to define the shape of the part to be manufactured, characterised in that: said part has a complex shape, including at least one first slender portion (V), such as a rod, plate, bevel, or shell, and a second portion (B), such as a base, plinth, or solid part, which is not slender in the slender direction of said first portion, and in that said uniaxial pressure is applied in a direction (z) substantially parallel to the smallest dimension of said first portion of the part, or to one of the two smallest dimensions thereof if said part is a rod. The invention also relates to a device for implementing such a method, and to a turbine blade made of a TiAl intermetallic alloy or a metal/silicide composite sintered by flash sintering.
Abstract:
A method of forming a powder of a composite material is provided, each composite powder particle comprising both a matrix phase and a reinforcement phase distributed within the matrix phase. The method comprises the step of forming a precursor powder (190) with an average particle size of less than 150 micrometres, each precursor powder particle comprising a matrix precursor material and a reinforcement precursor material. The matrix precursor material comprises a reducible compound comprising a first metal and oxygen. The precursor powder is reduced under conditions in which oxygen is removed from the matrix precursor material, but in which the reinforcement precursor material does not react. Thus, the matrix phase of the composite comprises the first metal, and the reinforcement phase of the composite consists of the reinforcement precursor material. A precursor powder (190) and a powder of a composite material are also provided.
Abstract:
Procédé de fabrication d'une pièce par fusion sélective de poudre, dans lequel: on dépose une première couche (12) d'une première poudre (2) ayant comme élément principal un premier élément; on dépose sur la première couche une deuxième couche (15) d'une deuxième poudre (22) ayant comme élément principal un deuxième élément, différent du premier élément; et on déplace un premier faisceau énergétique (11), par exemple un faisceau laser ou un faisceau d'électrons, sur la deuxième couche (15), l'énergie apportée par le premier faisceau permettant d'initier une réaction exothermique entre le premier élément et le deuxième élément, l'énergie dégagée par cette réaction exothermique permettant de fondre ensemble, localement, les première et deuxième couches (12, 15).
Abstract:
A method for producing a magnesium base composite material, which comprises a step of admixing a matrix powder comprising magnesium and a Si powder to provide a compound, a step of subjecting the compound to a plastic working to prepare a compact product, a heating step of heating the compact product to prepare a hot compact product containing Mg 2 Si through the reaction of Mg and Si, and a warm plastic working step of subjecting the hot compact product to a warm plastic working. The method allows the suppression of the growth of a Mg 2 Si particle to a coarse particle, which results in the production of a magnesium base composite material having high mechanical properties such as strength and hardness, for example, a magnesium base composite material having a tensile strength of 100 to 500 MPa.