摘要:
The invention relates to a method for producing an orthodontic component (1) formed by a polycrystalline ceramic structure, wherein the powder that is used is formed into a green body and subsequently sintered in a temperature range having a lower limit of more than 1900ºC, in particular 2100ºC, and an upper limit of 2500ºC, in particular 2400ºC, preferably 2200ºC, over a duration having a lower limit of 3 hours, in particular 5 hours, preferably 7 hours, up to an upper limit of 24 hours, in particular 15 hours, preferably 10 hours. Subsequently, the sintered component (1) is cooled down to room temperature, wherein the material is formed in a thickness of 0.5 mm having inline translucency with a lower limit of 70%, in particular 85%, and an upper limit of 100%.
摘要:
A polycrystalline alumina body includes aluminum oxide, magnesium oxide, zirconium oxide, and lutetium oxide. The lutetium oxide is present in an amount of at least 10 ppm of the weight of the ceramic body, and the magnesium and zirconium oxides are present at a molar ratio of from 0.5:1 to 3:1.
摘要:
The disclosed invention relates to a method of manufacture of transparent ceramics such as yttrium aluminum garnet by tape casting. The method entails forming a mixture of ceramic oxide, dispersant and organic solvent, milling the mixture to produce a first slurry, mixing the first slurry with an organic binder and a plasticizer to form a treated slurry, milling the treated slurry to produce milled slurry, tape casting the milled slurry to produce cast tape, drying the cast tape to produce dried tape, stacking portions of dried tape to form an assembly, compressing the assembly to produce a preform, heating the preform to produce a green preform, and sintering the green preform to produce transparent yttrium aluminum garnet. The method may be used to produce a unitary ceramic product having differing transparent sections as well as transparent ceramic product having a dopant gradient across a portion of the thickness of the product.
摘要:
La presente invención se refiere a un procedimiento de dopaje para Ia sinterización de α-alúmina que comprende las siguientes etapas: Preparar una suspensión de polvo de α-alúmina en un disolvente, que se mantiene en agitación, Añadirle una disolución de alcóxido de aluminio, como dopante, en atmósfera inerte, Secar para eliminar el disolvente, hasta obtener un polvo seco, que se tamiza y calcina, Molienda de atrición del polvo calcinado, secado y tamizado Obtención del cuerpo en verde mediante cualquiera de las técnicas existentes, preferentemente conformado por prensado isostático en frío, y Sinterización del cuerpo en verde obtenido en horno, y al uso del material de α-alúmina policristalina para fabricar componentes ópticos o cerámica técnica estructural.
摘要:
A method for preparing highly dense functional oxides with crystallite size in the range of 10-20 nm. Using a high pressure modification of a the Spark Plasma Sintering (SPS) technique, rapid thermal cycles (
摘要:
A method for preparing highly dense functional oxides with crystallite size in the range of 10-20 nm. Using a high pressure modification of a the Spark Plasma Sintering (SPS) technique, rapid thermal cycles (