摘要:
The present disclosure provides a method for fabricating biocompatible orthopedic prosthesis such as acetabular socket and femoral head with highest possible mechanical properties, wherein the method includes the steps of: a) providing a composite material powder, and placing the composite material powder into a mold cavity; b) applying uniform uniaxial pressure to the powder- filled mold cavity to cause the composite material powder to be compacted and formed into a green compact of acetabular socket or femoral head, and unloading the compact from the cavity; d) pre- sintering the green compact to bond the compacted powder, thereby forming a intermediate solid compact; e) machining the pre-sintered compact; f) sintering the machined compact; and g) polishing the machined compact to produce the acetabular socket or femoral head. The present disclosure further provides an apparatus for near net shape fabrication of acetabular socket and femoral head with patient-specific dimensions and a composite material for producing acetabular socket or femoral head for use in total hip prosthesis, wherein the composite material comprises: 60 to 95 % by weight of alumina; and 1 to 40 % by weight of zirconia. and preferably magnesium nitrate as sintering aid.
摘要:
A hydraulic plant (1) for presses, in particular for presses (2) for manufacturing ceramic products, the presses (2) being of the type comprising a presser unit (3) provided with at least one hydraulic cylinder (4) for pressing products; the plant (1) comprises a plurality of hydraulic power packs (5a,5b,5c,5d) for actuating the presser unit (3), connected together in parallel, adapted to send a flow of pressurised oil to the hydraulic cylinder (4) that can be varied relative to the different operating needs of the press (2).
摘要:
A method of forming a ceramic product, the method comprising producing a ceramic foaming mixture in the form of a slurry, causing the slurry to foam, extruding the foamed slurry to produce a plurality of lengths of extruding material each with a diameter of less than 10mm, firing the extruded material so as to partially sinter the extruded material, forming the partially sintered extruded material into a required shape for a product, and subsequently firing the shaped partially sintered extruded material to form the ceramic product.
摘要:
Bei einer aus Formunterteil und Formoberteil bestehenden Form zur maschinellen Herstellung von Betonformsteinen wird zur Zentrierung der Druckplatten (DP) in den Formnestern (FN) vorgeschlagen, an wenigstens zwei vorzugsweise diagonal entgegen gesetzten Positionen der Gesamtheit der Druckplatten (DP) des zusätzliche Zentriereinrichtungen (ZV) vorzusehen, welche von der Kontur der betroffenen Druckplatten seitlich abstehen und an diesen Stellen die mittlere Breite eines Luftspalts (LS) zwischen Druckplatten (DP) und Formnestwänden (FW) verringern.
摘要:
The structure for presses comprises: a resistant structure constituted by at least one resistance element (1) which in turn comprises a flat annular element (2) internally of which and in diametrically opposite positions two facing surfaces (20) are arranged, between which facing surfaces (20) at least one power tool (5) can be inserted, for exerting a pressing action and compressing between two bodies an object or a material to be pressed, the two facing surfaces (20) receiving equal and opposite reactions to the pressing action. Cuts are made at ends of the facing surfaces (20) which cuts involve a total thickness of the facing surface (20). Each of the cuts comprises a first tract (22) which is parallel to a pressing direction and a second part (23) which is circular in shape; the circular second part (23) of cut constituting a snug seating for discs (24). Means for interpositioning are provided for being interpositioned between ends of the facing surfaces (20) so that two resultants, parallel to the pressing direction, of action exerted on each of the facing surfaces 20 are located externally to centres of corresponding circular second parts (23).
摘要:
A method for pressing powdered material to obtain tiles, comprising distributing powders (1) on flexible conveyor means (3) and advancing said powders along a direction of advance through a pressing station (13), containing said powders on said conveyor means (3) by containing means in said pressing station (13), pressing said powders (1) in said pressing station (13), characterized in that said containing means act on the powders to be pressed during said avancing and those containing means continue to act during said pressing. The compacted layer (14) is transferred towards mould means (4) and a portion (22) of the compacted layer (14) is severed and pressed by descending the punch (18) towards the bottom portion (19) at the mould means (4).
摘要:
Hydraulically settable mixtures are extruded through auger extruder (20) into a variety of objects which are form-stable in the green state. High green strength is achieved by increasing yield stress of the mixture while maintaining adequate extrudability through first and second auger screws (26, 32) in first and second interior chambers (24, 30). Optimizing particle packing density while including a deficiency of water yields a hydraulically settable mixture which flows under pressures typically associated with extrusion of clay or plastic. A rheology-modifying agent can be added to increase yield stress while not significantly increasing viscosity of the mixture extruded through die head (34). Desired strength properties and other performance criteria of the final hardened extruded product having width and thickness dimensions generally corresponding to die width (38) and die thickness (39) of transverse slit (36), are controlled by adding aggregates, fibers, and other admixtures.