摘要:
A porous and permeable composite for treatment of contaminated fluids characterized in that said composite includes a body of iron particles and 0.01-10% by weight of at least one functional ingredient distributed and locked in the pores and cavities of the iron body. Also, methods of making a permeable porous composite for water treatment. Also, use of a permeable porous composite for reducing the content of contaminants in a fluid, wherein said fluid is allowed to pass through the permeable composite.
摘要:
Disclosed herein are embodiments of a hard weld overlay which can be resistant to cracking. The alloys can be able to resist cracking through prevention of the precipitation and/or growth of embrittling carbide, borides, or borocarbides along the grain boundaries at elevated temperatures. By controlling the thermodynamics of the boride and carbide phases, it is possible to create an alloy which forms hard wear resistant phases that are not present along the grain boundaries of the matrix.
摘要:
A family of materials wherein nanostructures and/or nanotubes are incorporated into a multi-component material arrangement, such as a metallic or ceramic alloy or composite/aggregate, producing a new material or metallic/ceramic alloy. The new material has significantly increased strength, up to several thousands of times normal and perhaps substantially more, as well as significantly decreased weight. The new materials may be manufactured into a component where the nanostructure or nanostructure reinforcement is incorporated into the bulk and/or matrix material, or as a coating where the nanostructure or nanostructure reinforcement is incorporated into the coating or surface of a “normal” substrate material. The nanostructures are incorporated into the material structure either randomly or aligned, within grains, or along or across grain boundaries.
摘要:
Disclosed herein is a method for manufacturing a composite having nanofibers uniformly dispersed in a metal, polymer or ceramic matrix. The method comprises mixing the nanofibers with a metallic, polymeric or ceramic material, followed by uniformly dispersing the nanofibers in the material via deformation of the metal, polymer or ceramic matrix by application of mechanical energy to the material; and imparting a directionality to the nanofibers via application of a mechanical mass flowing process to a composite material with the nanofibers uniformly dispersed in the metal, polymer or ceramic matrix. With the method, since the nanofibers can be uniformly dispersed in the metal, polymer or ceramic matrix via a simple mechanical process, the composite can be manufactured through a simple process, thereby enhancing manufacturing efficiency.
摘要:
The present invention contemplates an internally reinforced high-speed magnetic thrust disk. In one embodiment the internally reinforced composite thrust disk comprises a plurality of high strength fibers coupled together by a soft magnetic alloy. Further, in one aspect the disk having internally reinforced zones for controlling bore growth and counteracting forces associated with the reaction between the stator and the rotor of the electromagnetic thrust bearing system.
摘要:
The invention relates to a composite hard metal body of hard material, a binder and embedded reinforcing material, as well as to a process for the production of the composite hard metal body by methods of powder metallurgy.In order to create a composite hard metal body with improved toughness under load, improved hardness and a lower fracture susceptibility, the invention proposes to build in monocrystalline, preferably needle-shaped and/or platelet-shaped reinforcing materials, coated with an inert layer with respect to the binder metal phase and consisting of borides and/or carbides, and/or nitrides and/or carbonitrides of the elements of Groups IVa or Va or mixtures thereof and/or coated monocrystalline reinforcing material of SiC, Si.sub.3 N.sub.4, Si.sub.2 N.sub.2 O, Al.sub.2 O.sub.3, ZrO.sub.2, AlN and/or BN.The composite hard metal body is produced by powder-metallurgical methods, whereby the reinforcing material in a deagglomerated and graded state, optionally coated by CVD or PVD with a layer which is inert with respect to the binder metal phase, is blended with the ground mixture of hard materials and binder, dried, granulated, uniaxially pressed or isostatically pressed at low temperatures and then the composite body is produced by sintering, respectively a combined or separate sintering/HIP-process or through axial hot-pressing. The axial hot-pressing is preferred in cases where the reinforcing material surpasses 20% by volume, under this level the other mentioned processes are preferred.
摘要:
A heat-resistant aluminum alloy sinter comprises 5 to 12% by weight of Cr, less than 10% by weight of at least one selected from the group consisting of Co, Ni, Mn, Zr, V, Ce, Fe, Ti, Mo, La, Nb, Y and Hf, and the balance of Al containing unavoidable impurities. A silicon carbide fiber is included for reinforcing the sinter in a fiber volume fraction range of 2 to 30%.
摘要:
A process is described for forming a composite cast article comprising an aluminum-silicon alloy matrix containing a modifying amount of strontium and a preform of bonded-together reinforcing fibres incorporated in the matrix, in which the preform of reinforcing fibres is infiltrated under pressure by a melt of the alloy and the composite article thus formed is allowed to solidify by cooling. According to the novel feature, the fibres of the preform are coated with strontium, preferably in the form of SrO, before being infiltrated by the alloy melt. The strontium on the fibres is free to react with the Al-Si melt and thus modify the structure in the region of the preform such that an excess of silicon particles adjacent the fibres is avoided.
摘要:
A unidirectionally solidified anisotropic metallic composite body of improved stability and high temperature properties is provided with a solid solution matrix of a superalloy of the nickel-base or cobalt-base type and comprising, by weight, at least about 2% Re and less than about 0.8% Ti. Embedded in the matrix is an aligned carbide reinforcing fibrous phase, preferably one selected from carbides of Ta, V or their alloys and mixtures.