265 results about "All ceramic" patented technology

A method for electrophoretic deposition of ceramic particles as a green body shaped as a dental appliance, the method comprising the steps of (a) forming a suspension of the ceramic particles in a first polar solvent, the ceramic particles constituting at least about 5% of the first suspension by weight; (b) passing a direct electrical current through the first suspension, using a deposition electrode shaped as the dental appliance to form a green body; (c) coating the green body with glass particles; and (d) sintering the resultant coated body for obtaining a glass coated all-ceramic dental appliance.

Pyrolyzing gasification system and method of use including primary combustion of non-uniform solid fuels such as biomass and solid wastes within a refractory lined gasifier, secondary combustion of primary combustion gas within a staged, cyclonic, refractory lined oxidizer, and heat energy recovery from the oxidized flue gas within an indirect air-to-air all-ceramic heat exchanger or external combustion engine. Primary combustion occurs at low substoichoimetric air percentages of 10-30 percent and at temperatures below 1000 degrees F. Secondary combustion is staged and controlled for low NOx formation and prevention of formation of CO, hydrocarbons, and VOCs. The gasifier includes a furnace bed segmented into individual cells, each cell is independently monitored using a ramp temperature probe, and provided with controlled air injection. Gasifier air injection includes tuyere arrays, lances, or both. The oxidizer includes three serially aligned stages separated by air injecting baffles, and ability to adjust the exit air temperature.

Embodiments of the present invention provide an osseointegrative implant and related tools, components and fabrication techniques for surgical bone fixation and dental restoration purposes. In one embodiment an all-ceramic single-stage threaded or press-fit implant is provided having finely detailed surface features formed by ceramic injection molding and/or spark plasma sintering of a powder compact or green body comprising finely powdered zirconia. In another embodiment a two-stage threaded implant is provided having an exterior shell or body formed substantially entirely of ceramic and/or CNT-reinforced ceramic composite material. The implant may include one or more frictionally anisotropic bone-engaging surfaces. In another embodiment a densely sintered ceramic implant is provided wherein, prior to sintering, the porous debound green body is exposed to ions and/or particles of silver, gold, titanium, zirconia, YSZ, α-tricalcium phosphate, hydroxyapatite, carbon, carbon nanotubes, and/or other particles which remain lodged in the implant surface after sintering. Optionally, at least the supragingival portions of an all-ceramic implant are configured to have high translucence in the visible light range. Optionally, at least the bone-engaging portions of an all-ceramic implant are coated with a fused layer of titanium oxide.

A holding device comprises a cylindrical or prismatic, porous ceramic blank and elements for clamping in a machine tool for processing the blank by removing material, in order to produce a ceramic workpiece. A narrow frame is fixed by an adhesive connection over at least part of the periphery of the blank, which is held without stresses, in the area of a plane encompassing the longitudinal middle axis (A) of the blank. The frame only covers a small part of the surface of the blank and can be detached and held in a stable holder with a clamping adapter, in such a way that it cannot slide. The entire combination is fixed in the machine tool in such a way as to be resistant to twisting and sliding. The ceramic workpiece emerges continuously form the ceramic blank without predetermination of the advance direction, until holding segments which can then only be freely selected according to number and location have been formed. The holding segments end on the residual material of the blank in the area of the frame or on the frame itself. The holding device is used especially as a workpiece for producing fully ceramic dental prostheses, particularly crowns or bridges.

The invention provides a manufacture method of a clinical personalized and integrated all-ceramic post-and-core of dentistry. The manufacture method is characterized in that a high-precision and short-wavelength visible scanner is adopted and directly used for scanning intraoral defected teeth subjected to root canal preparation, the CAD/CAM (Computer Aided Design/Computer Aided Manufacturing) central incisor prosthetic design is adopted, the design of integrating the post and the core is accomplished, and then the incisor back-cut method design is carried out to accomplish the design of the integrated all-ceramic post-and-core, and numerical control processing equipment is adopted and used for processing in order to accomplish the manufacture of the all-ceramic post-and-core.

ESD safe ceramic component is provided which includes a sintered composition which is formed of a base material and a resistivity modifier. The base material includes a primary component and a secondary component, the primary component including Al₂O₃ and the secondary component including tetragonal-ZrO₂.

The invention provides a raw material for an all-ceramic dental restoration system and a rapid prototyping method of the raw material, which belongs to the technical field of materials and preparation methods thereof. The raw material comprises the following components in weight part: 20 to 75 parts of ultrafine ceramic powders, 0.1 to 5 parts of coloring agent, 0.1 to 5 parts of fluorescent agent, 0.1 to 5 parts of dispersant, 0 to 20 parts of flocculating agent, 0 to 5 parts of thickening agent, 0 to 5 parts of flow promoting agent and 0 to 10 parts of strengthening auxiliary. According to the technical scheme of the invention, embryo bodies can be directly molded without the need of adding any binder. Therefore, dental restorations are high in strength after the later sintering process.

A piezoelectric electroacoustic transducer eliminates the need for the interconnection between main surface electrodes and internal electrodes, and is capable of constructing a bimorph diaphragm using a simple connection structure. The piezoelectric electroacoustic transducer includes a laminated body formed by laminating two or three piezoelectric ceramic layers, main surface electrodes each provided on the top and bottom main surfaces, and an internal electrode provided between any adjacent two piezoelectric ceramic layers. In the piezoelectric electroacoustic transducer, all ceramic layers are polarized in the same direction with respect to the thickness direction, and by applying an alternating voltage across the main surface electrodes and the internal electrode, the laminated body generates a bending vibration in its entirety.

The invention discloses a wet forming production method of a dental all-ceramic restoration. According to the method, a prefabricated ceramic block is not used for processing, and in production processes, a support column is not required for fixing the ceramic block and the restoration, so that the process steps of manually removing the support column by milling to separate the formed restoration and the surrounding ceramic block and burnishing and polishing the excessively rough outer surface of the restoration caused by removing the support column by milling are avoided, and the risks of disintegration of the restoration and premature fracture failure are further reduced. A ceramic hard biscuit for milling processing is produced by adopting a wet forming technology, and compared with the ceramic block which is formed by dry pressing and partially sintered, the microscopic structure is more uniform and contains fewer particle packing defects. Through milling processing of the ceramic hard biscuit which is not sintered, the surface finish which is higher than that obtained by processing the ceramic block which is partially sintered can be obtained. The dental all-ceramic restoration produced by adopting the technical scheme of the invention has the advantages of no connection points for the support column on the outer surface, no partial milling marks and ceramic cracks, bright and clean surface, uniform and consistent structure and high reliability.

A provided metal-supported solid oxide fuel cell comprises an electrolyte layer and porous electrode precursor layers at two sides of the electrolyte layer, an anode active material is deposed on the hole inner wall of the porous electrode precursor layer at one side for forming the cell anode, a cathode active material is deposed on the hole inner wall of the porous electrode precursor layer at the other side for forming the cell cathode, and the porous electrode precursor layers at two sides both comprise a porous alloy layer. According to the technical scheme, a rare earth ceramic material in a cell support of a total ceramic structural solid oxide fuel cell is replaced by alloy, so that cost is substantially reduced. The cell support is prepared by utilizing conventional ceramic molding technology, so that the technology is simplified, the cost is low, the operability is high, and batch production is facilitated. The anode material and the cathode material are deposed at the hole inner walls of the porous alloy electrode precursor layers at two side of the electrolyte by employing a chemical liquid-phase deposition process, so that the preparation difficulty of the electrodes of the metal-supported solid oxide fuel cell is solved, and the metal-supported solid oxide fuel cell has good electrochemical properties.

The invention discloses a lithium disilicate glass ceramic used for dental zirconia veneering porcelain and a preparation method and application thereof, the lithium disilicate glass ceramic comprises56%-58% of SiO2, 27%-29% of Li2CO3, 3.7%-3.8% of K2CO3, 2.7%-2.8% of Al2O3, 2.3%-2.4% of ZrO2, 2.5%-2.6% of P2O5, 2.2%-3.8% of B2O3, 0.5% of Ti2O and 0.5% of CeO2. The preparation method comprises the steps that after raw material ball-milling and mixing, melting is performed, a melt is obtained, the melt is poured into a mold, then annealing is performed, and a glass blank is obtained; the glassblank is subjected to crystallization heat treatment, and the lithium disilicate glass ceramic is obtained. The obtained lithium disilicate glass ceramic is high in flexural strength, and the damageprobability of a restoration body due to veneering porcelain cracking can be remarkably reduced. The invention provides a method applying the lithium disilicate glass ceramic as zirconia veneering porcelain, in the restoration body obtained with the method, the bonding strength of the lithium disilicate glass ceramic veneering porcelain with a zirconia substrate is far higher than that of traditional zirconia decoration ceramic porcelain with the zirconia substrate, and the cracking resistance of a zirconia all-ceramic restoration body can be improved remarkably and the service life can be prolonged.

The invention discloses a milling forming production method of a dental all-ceramic restoration. In production processes, a support column is not required for fixing a ceramic block and the restoration, so that the process steps of manually removing the support column by milling to separate the formed restoration and the surrounding ceramic block and burnishing and polishing the excessively rough outer surface of the restoration caused by removing the support column by milling are avoided, and the risks of disintegration of the restoration and premature fracture failure are further reduced. Under the condition of being supported by a model material block, the milling of the ceramic block is more conductive to processing a thin-walled neck edge, and particularly, the milling of a ceramic hard biscuit which is not sintered is more conductive to improving the degree of finish of the outer surface of the dental all-ceramic restoration. The dental all-ceramic restoration produced by adopting the technical scheme of the invention has the advantages of no connection points for the support column on the outer surface, no partial milling marks and ceramic cracks, bright and clean surface, uniform and consistent structure and high reliability.

The invention belongs to the field of all-ceramics materials for the dentistry, and discloses a strengthening-toughening glass ceramic and a preparation method thereof. The strengthening-toughening glass ceramic comprises the following components in percentage by mass: 96 to 99% of basic component, and 1.0 to 4.0% of toughening component, wherein the basic component comprises the following components in percentage by mass: 58 to 62% of SiO2, 28 to 30% of Li2CO3, 3.5 to 4.0% of K2CO3, 2.5 to 3.0% of Al2O3, 11.4 to 1.6% of CeO2, and 2.6 to 3.0% of P2O5, and the toughening component is ZrO2.

The invention relates to a manufacturing process for chemically plating a NiP-Cu electrode on the partial surface of a ceramic element, in particular to a process for manufacturing an electrode by a chemical deposition method for base metal copper or nickel. The process comprises the following steps of: preparing the ceramic element, cleaning, drying, roughening, printing, activating, soaking, preplating, plating copper, dehydrating, drying, performing heat treatment, welding, testing and the like. The invention has the advantages that: a base metal layer on the surface of the ceramic element has high adhesion force and high performance and is easy to weld; the partial surface is chemically plated, so that the process is simple, and adhering, abrading and scattering processes of the conventional full electrode chemical plating process are eliminated; raw materials are saved, and the cost is reduced to one fifth of the original cost; and a plating solution formula is perfected, so that mass production of the electrode which is chemically plated on the partial surface of the ceramic element can be realized. The process is suitable for manufacturing electrodes of all ceramic elements.

High-strength bacteriostatic antibacterial lithium disilicate glass ceramic and a preparation method thereof belong to the technical field of biological materials. In the prior art, a dental department all-ceramic restorative material obtained by doping Ag<+>, Zn<2+> and Cu<2+> in lithium disilicate glass ceramic does not exist. The high-strength bacteriostatic antibacterial lithium disilicate glass ceramic is characterized by preparing materials for matrix glass according to the weight percentage of the matrix glass, additionally determining the total weight of Ag2O, ZnO and CuO in the high-strength bacteriostatic antibacterial lithium disilicate glass ceramic according to the ratio of 0.1 to 8 percent of the weight of the matrix glass, and preparing the matrix glass by adopting a high temperature melting method, wherein the content of the Ag2O is larger than or equal to 0 percent but less than or equal to 2 percent, ZnO is larger than or equal to 0 percent but less than or equal to 5 percent and CuO is larger than or equal to 0 percent but less than or equal to 1 percent, wherein only the content of AgO2, ZnO and CuO is allowed to be equal to 0 at the same time; coring the prepared matrix glass at the temperature of 450 to 550 DEG C for 1.5 to 2.5 hours; performing three-step crystallization: crystallizing at the temperature of 650 to 680 DEG C for 1 to 3 hours, crystallizing at the temperature of 710 to 740 DEG C for 20 to 60 minutes, crystallizing at the temperature of 800 to 830 DEG C for 10 to 20 minutes, so as to obtain the high-strength bacteriostatic antibacterial lithium disilicate glass ceramic.

The invention relates to a making method for a bionic ceramic dental prosthesis. The method comprises the steps that conventional 3mol% yttrium-stabilized zirconium dioxide ceramic with high strengthand low transparency and ceramic with high transparency are selected as prefabricated powder; a blank block/disc is pressed in a layered mode; in a transition buffer layer from the lower surface of ablank to the upper surface, the proportion of the 3mol% yttrium-stabilized zirconium dioxide ceramic is gradually decreased from 100% to 0, and the proportion of the ceramic with low strength and hightransparency is gradually increased from 0 to 100%; an occlusal surface or an attractive area of a CAD digital model of the dental prosthesis is placed on a bionic performance/color layer, and an axial surface area is placed on a high-strength anti-fracture layer; and making is completed by utilizing dental prosthesis manufacturing equipment. The method has the advantages that the problems that ajaw tooth is excessively worn by a high-strength single-layer full zirconia prosthesis, no stress buffer exists in the all-ceramic prosthesis implanting process, and the prosthesis is prone to beingfractured in the long time when totally adopting a bionic abrasion-resistant ceramic material can be solved, and meanwhile, the bionic color effect of the prosthesis can be achieved.

A dental all-ceramic restoration and manufacturing method thereof; the outer surface of the dental all-ceramic restoration has neither visible marks remaining from the removal of the connecting bars (7) nor local grinding traces and chipping, and is smooth with uniform structure. The manufacturing method thereof is wet-forming or milling. No connecting bars are needed to connect the dental restoration bodies (3) with a surrounding mould blank or ceramic blank. This eliminates the need for manually cutting off the connecting bars (7) to separate the forming body from the surrounding ceramic blank, further grinding and polishing process to treat the excessively rough outer surface, and thereby reducing the risk of chipping and premature failure. In the manufacturing processes thereof, the hardened ceramic green body (2) made by wet-forming technique has more homogenous microstructure and less particle packing defects than the dry-pressed blanks and partially sintered blanks. Furthermore, higher surface smoothness can be obtained by milling unsintered hardened ceramic green body than by milling partially sintered blanks. The dental all-ceramic restoration has a high degree of surface finish, and can be directly used without polishing, veneering or glazing.

The invention discloses a compact type hydro-hybrid ceramic main shaft device. On the structural design, the mode of radial middle and thrusting two ends is adopted, simultaneously, the structure that the metal fully includes a ceramic friction pair is adopted, and shape deformation of all ceramic parts can be avoided on design. In the invention, support bearings are taken as ceramic hydro-hybridceramic bearings, and simultaneously have the radial bearing function and axial thrusting function; the ceramic parts are prevented from bearing large tension action, or the condition that the parts are broken due to the overlarge stress of the edges of the parts is prevented, the concentration stress at the inner part of the ceramic parts is reduced, and breakage accidents caused by design flaw of the ceramic parts can be prevented; the lubricating liquid flow is saved as liquid outlet pressure of a radial bearing is taken as the liquid supply pressure of a thrust bearing; the seam of the radial bearing is taken as a choke holder of the thrust bearing, so that the cost of the choke holder is saved; and the radial baring can be tightly combined with the thrust bearing, so that the length is shortened under the condition of unchangeable radial bearing function and axial thrusting function of the main shaft, the structure is more compact and simple and the processing is convenient.

The invention discloses a zirconia tenacity-increasing alumina oxide dental ceramics substrate crown gelcasting forming method; the method comprises the following steps: dipping a special provided ceramic slurry by a stack porcelainsmall brush to compost all ceramic crown inner core on a dental die surface of a clinical patient and standing the dental die; absorbing the water content on the surface of the slurry and densifying to form embryonic core, and then drying the embryonic core at a constant temperature, taking off the all ceramic crown from the dental die, and sintering the all ceramic crown at a high temperature to prepare the ceramics substrate crown. In the invention, gel systems composed of organic monomer and crosslinker are used, high solid content and strongly plastic core biscuit is obtained by the free radical polymerization reaction, nano-ceramic particles are used as dispersed phase to introduce micron ceramic matrix to prepare a nano-composite ceramic, and the nano-composite ceramic has good strenghing and toughing effect, high strength material and high toughness, small change of sintering volume, moreover the forming method of the invention is easy and fast to operate, and can prepare dental ceramics substrate crown into various complicated shapes and approach net size forming.