Abstract:
Gegenstand der Erfindung ist ein einen flüssigphasengesinterter Werkstoff auf Basis von Siliziumnitrid sowie die Verwendung des Werkstoffes in der Gießereitechnik, insbesondere der Gießerei von Nichteisenmetallen, beispielsweise Edelmetallen, Leichtmetallen, Schwermetallen, Halbmetallen oder Legierungen aus diesen Metallen. Der Werkstoff enthält bevorzugt eine amorphe Korngrenzphase und hat eine Enddichte größer 90 %.
Abstract:
The present invention relates to a novel coloring solution and to the use of the coloring solution for impregnating a spray dried granulate. Further, the invention relates to a process for the preparation of a colored spray dried granulate and to a colored spray dried granulate obtainable according to this process. The invention also relates to a process for the preparation of a colored shaped ceramic blank; to a colored shaped ceramic blank obtainable according to this process; and to the use of the colored shaped ceramic blank for the preparation of dental articles. Preferred dental articles are crowns, bridges, inlays, onlays, veneers, facings, crown frameworks, bridged frameworks, implants, abutments, copings or orthodontic appliances.
Abstract:
A method of making a hot surface igniter is described. A silicon carbide composition that includes both fines fraction and a coarse fraction is sintered in a nitrogen and argon reducing atmosphere in a manner that controls the incorporation of nitrogen with in the lattice of recrystallized silicon carbide. The controlled incorporation of nitrogen in the lattice provides enhanced control over heating and electrical properties, while simultaneously achieving a lower surface area fully recrystallized structure for oxidation resistance and long service life.
Abstract:
A multi-layer fiber coating is provided which, in an illustrative embodiment, includes: a ceramic grade Nicalon preform; a silicon carbide coat applied over the fibers; a boron nitride interface coat applied over the silicon carbide coat; wherein the boron nitride coat has a thickness of about 0.5 micron; a silicon carbide coat applied over the boron nitride coat; and wherein the silicon carbide has a thickness of about 2 micron. A multi-layer fiber coating, comprising: a Tyranno Lox-M fiber coated in tow form with 1 micron of silicon carbide by a chemical vapor deposition process and about 1 micron of silicon nitride; a silicon doped boron nitride coat is applied over the about 1 micron of silicon nitride; and wherein the doped boron nitride coat has a thickness of 0.3 micron is also provided. A multi-layer fiber coating, comprising: a T-300 carbon fiber preform; a coat that is graded from PyC to SiC is applied over the T-300 carbon fiber preform; wherein the graded PyC to SiC coat has a thickness of about 1.5 micron; a silicon doped boron nitride interface coat is applied over the graded PyC to SiC coat; wherein the silicon doped boron nitride interface coat has a thickness of about 0.5 micron; and a silicon carbide coat of 2 micron is applied over the silicon doped boron nitride interface coat, is also provided.
Abstract:
A polycrystalline diamond compact (PDC), which is attached or bonded to a substrate to form a cutter for a drill bit, is comprised of sintered polycrystalline diamond interspersed with a seed material which has a hexagonal close packed (HCP) crystalline structure. A region of the sintered polycrystalline diamond structure, near one or more of its working surfaces, which has been seeded with an HCP seed material prior to sintering, is leached to remove catalyst. Selectively seeding portions or regions of a sintered polycrystalline diamond structure permits differing leach rates to form leached regions with differing distances or depths and geometries.
Abstract:
The present invention provides a ceramic to ceramic joint and methods for making such a joint. Generally, the joint includes a first (15) ceramic part and a second (20) ceramic part, wherein the first (15) and second (20) ceramic parts each include a ceramic-carbide or a ceramic-nitride material. In some cases, an aluminum-initiated joint region joins the first (15) and second (20) ceramic parts. This joint region typically includes chemical species from the first (15) and second (20) ceramic parts that have diffused into the joint region. Additionally, the first (15) and second (20) ceramic parts each typically include a joint diffusion zone that is disposed adjacent to the joint region and which includes aluminum species from the joint region that have diffused into the joint diffusion zone. Other implementations are also described.
Abstract:
Die vorliegende Erfindung betrifft einen monolithischen Keramikkörper mit Mischoxid-Randbereich und metallischer Oberfläche, wobei der Keramikkörper das Oxid eines ersten Metalls (I), einen Mischoxid-Randbereich, welcher das Oxid des ersten Metalls (I) und das Oxid eines weiteren Metalls (II), welches eine hohe Affinität zu Sauerstoff hat, umfasst, und eine metallische Oberfläche aus dem Metall (II) auf dem Mischoxid-Randbereich aufweist, wobei der Mischoxid-Randbereich einen kontinuierlichen Konzentrationsgradienten des ersten Metalls (I), ausgehend von 100% im Kern bis zu 0% im Übergangsbereich zu der metallischen Oberfläche des Keramikkörpers, bezogen auf den Gesamtmetallgehalt (I+II), und einen kontinuierlichen Konzentrationsgradienten des weiteren Metalls (II), ausgehend von 0% im Kern bis zu 100% im Übergangsbereich zu der metallischen Oberfläche des Keramikkörpers, bezogen auf den Gesamtmetallgehalt (I+II), aufweist, die Sauerstoffkonzentration indem Mischoxid-Randbereich konstant bleibt, und die monolithische Struktur des Keramikkörpers phasengrenzenlos ausgebildet ist.
Abstract:
Composite materials comprising titanium diboride and boron nitride that are used to line electrolytic aluminum production cells (10) are disclosed. The composite materials may be used to line the side walls (14, 16) and/or bottom wall (12) of the cell (10). The ratio of titanium diboride to boron nitride may be controlled in order to provide the desired level of electrical conductivity depending upon the particular region of the cell (10) in which the liner plate (12, 14, 16) is installed. The titanium diboride/boron nitride composite materials exhibit desirable aluminum wetting behavior, and are capable of withstanding exposure to molten cryolite (20), molten aluminum (22) and oxygen at elevated temperatures during operation of the electrolytic aluminum production cells (10).
Abstract:
A method of forming a PDC cutter having solvent metal catalyst located adjacent the diamond and/or in the diamond and a layer of reactive material on the layer of diamond, the layer of reactive material for promoting the flow of the solvent metal catalyst material from the layer of diamond under high pressure and high temperature.
Abstract:
Die Erfindung betrifft eine Verwendung einer keramischen Schicht (12) mit Partikeln (16), die an der Kondensationsfläche (13) die Benetzbarkeit durch Wasser (W) herabsetzen bei einem Kondensatorbauteil (11) für Wasserdampf, wie dieses beispielsweise in der Kraftfahrttechnik Verwendung findet. Weiterhin betrifft die Erfindung ein Verfahren zum Erzeugen einer solchen Schicht, wobei die Partikel (16) sowie Vorstufen der Keramik in einem Lösungsmittel gelöst, auf die Innenwandungen des Kondensatorrohres (11) aufgebracht und durch eine Wärmebehandlung in eine Keramik umgewandelt werden. Es hat sich gezeigt, dass derartig erzeugte Beschichtungen auch über eine größere Betriebsdauer des Kondensatorbauteils (11) hinweg die Benetzbarkeit der Kondensatorfläche (13) herabsetzen und damit den Wirkungsgrad der Kondensation vorteilhaft erhöhen.