摘要:
Method for the production of an element subject to wear (10), comprising a metal matrix (14) and at least a core (12) of hard material. The method provides a first step in which a temporary aggregation structure (17) is prepared with at least partly open pores, which volatilize or in any case eliminate at least partly when subjected to heating. A second step in which, on the whole internal and external surface of said temporary aggregation structure ( 17), a liquid mixture of a binder with metal powders which contain hard elements or their precursors is uniformly distributed. A third step in which the temporary aggregation structure (17) is deteriorated by means of a thermal action of controlled heating, so as to take at least part of the temporary aggregation structure (17) to evaporation, rendering free a volume inside the core (12), and to consolidate the mixture according to the conformation of the temporary aggregation structure (17). A fourth step in which the core (12) is disposed in a mold (16) so as to only partly occupy the free volume of the mold (16). A fifth step in which a molten metal material is cast in the mold (16), which metal occupies the free volume and the volume that has been made free, both inside and outside the core (12), so as to anchor to the latter and thus form a single body.
摘要:
Provided here is a method of producing a monolithic body from a porous matrix, comprising: (i) providing a porous matrix having interstitial spaces and comprising at least a first reactant; (ii) contacting the porous matrix with an infiltrating medium that carries at least a second reactant; (iii) allowing the infiltrating medium to infiltrate at least a portion of the interstitial spaces of the porous matrix under conditions that promote a reaction between the at least first reactant and the at least second reactant to provide at least a first product; and (iv) allowing the at least first product to form and fill at least a portion of the interstitial spaces of the porous matrix, thereby producing a monolithic body, wherein the monolithic body does not comprise barium titanate.
摘要:
A composite material that includes a ceramic with or without a fiber and a metal with the metal being magnesium, wherein the magnesium infiltrates the ceramic to form a continuous matrix, encapsulates the ceramic, or both infiltrates and encapsulates the ceramic or encapsulates the ceramic and fiber.
摘要:
Die Erfindung betrifft ein Formkörper, insbesondere von Sorbensformkörper aus mikro- und mesoporösen Adsorbentien sowie aus Kompositadsorbentien, die zur Speicherung von Nutzwärme und Nutzkälte dienen. Der Formkörper weist dabei einen verminderten Anteil an Bindemitteln auf. Die Sorbensformkörper weisen ungleich verteilte Hohlräume in Form von Lückenvolumen ausbildenden Vakuolen auf. Die Formkörper werden dadurch erhalten, dass die festen vorgemischten Bestandteile des Formkörpers auf einen porösen oder perforierten Träger gebracht werden und nach Zugabe des Bindemittels der Vorgang der Vorverfestigung des Bindemittels durch Einwirkung eines äußeren Kraftfeldes erfolgt und dieses Kraftfeld dazu führt, dass die ungleich verteilten Hohlräume entstehen und dass der Bindemittelanteil an dem Träger, der die Wandung des Formkörpers darstellt, höher ist als im Inneren des Formkörpers. Die Vorteile des erfindungsgemäßen Sorbensformkörpers bestehen in einer optimal möglichen Zusammenführung der reaktionstechnischen Wirksamkeit von modifizierten Alumosilicaten und/oder Aluminiumsilicaten und ihrer strömungstechnischen Wirkung beim Stoff- und Wärmeaustausch mit dem Ziel, hohe Raum-Zeit-Ausbeuten bei der Speicherung von Nutzwärme und Nutzkälte zu erreichen.
摘要:
The invention relates to a bioceramic coated apparatus and method of forming the same. The apparatus may be a medical implant such as, for example, an orthopedic implant or a dental implant. The bioceramic coating is designed to increase tissue and/or bone growth upon implantation of the apparatus. The apparatus has a valve metal substrate having a nanoporous valve metal oxide surface layer. The nanoporous surface layer contains a plurality of nanopores. The nanopores have adsorbed phosphate ions on at least their interior surfaces. A bioceramic coating is formed on the nanoporous surface and anchored into the nanopores. Optionally, the nanopores are formed into a tapered shape in order to increase adhesion to the bioceramic coating.
摘要:
A ceramic structure having a scaffold with at least one opening and at least one porous filler material at least partially filling the at least one opening is described. The porous ceramic filler includes a plurality of pores. The pores have an average size in a range from about 2 nm to about 100 nm. The plurality of pores includes at least one pore architecture. For each pore architecture, the average pore size does not vary by more than about 100% when the average pore size is in a range from about 2 nm to about 50 nm, and the average pore size does not vary by more than about 50% when the average pore size is greater than about 50 nm. The plurality of pores includes at least two pore architectures when the porous filler material is silica. Also described is a method of making the ceramic structure.
摘要:
A composite material that includes from about 18 wt% to about 22 wt% of a thermosetting polymeric resin; and from about 82 wt% to about to about 78 wt% of an inorganic filler, wherein the inorganic filler comprises a mixture of particles wherein about 20 parts by weight of the mixture has an average particle size of about 10 gm or larger, about 15 parts by weight of the mixture has an average particle size of from less than 10 µm to about 5 µm, and about 10 parts by weight of the mixture has an average particle size of from about 3 to about 1 gm.
摘要:
Schichtsystem nach dem Stand der Technik, bei dem eine keramische Schicht auf einer metallischen Schicht des Schichtsystems aufgebracht ist, weisen oft eine schlechte Verbindung zwischen Metall und Keramik auf.Ein erfindungsgemäßes Schichtsystem (20) weist eine poröse Schicht (4) auf, in der zumindest teilweise eine Keramik (7) angeordnet ist, so dass die Verbindung zwischen Keramik (7) und dem Metall der porösen Schicht (4) verbessert ist.