摘要:
L'invention se rapporte à une céramique polycristalline uniquement formée à base d'alumine, d'oxyde de chrome et d'oxyde de magnésium permettant d'obtenir une céramique rouge opaque avec une ténacité supérieure à 2,8 MPa.m 1/2 .
摘要:
A single crystal yttrium aluminum perovskite scintillator has a minimum thickness of at least 5 mm and a transmittance of at least 50% at a wavelength of 370 nm. A method for fabricating the yttrium aluminum perovskite scintillator includes acquiring a yttrium aluminum perovskite single crystal boule, annealing the yttrium aluminum perovskite single crystal boule in an oxygen containing environment to obtain a partially annealed crystal, and annealing the partially annealed crystal in an inert environment or a reducing environment to obtain the yttrium aluminum perovskite single crystal scintillator.
摘要:
A handle substrate is composed of a translucent alumina sintered body containing a sintering aid including at least magnesium. A concentration of magnesium at a bonding face of the handle substrate to a donor substrate is half or less of an average concentration of magnesium of the handle substrate.
摘要:
Es wird ein Verfahren zur Herstellung einer polykristallinen Keramik beschrieben, wobei ein Keramikgranulat mit einer Primärkorngröße von ≤ 500 nm, vorzugsweise ≤ 300 nm, durch zyklisches Pressen auf eine Gründichte von ≥ 40% der theoretischen Dichte (TD) verdichtet wird. Anschließend erfolgt eine Vorsinterung und ein Sinterhippen oder ein konventionelles Sintern bis zum Auftreten einer geschlossenen Porosität und ein Nachhippen des zyklisch gepressten Grünkörpers, so dass die hergestellte transparente Keramik eine Dichte von ≥ 99,8% TD besitzt.
摘要:
The invention relates to an α-Al 2 O 3 sintering material that is suitable for producing high-density, submicrocrystalline, ceramic molded bodies having high strength and that combines the advantages of the use of submicrometer or nanometer powder as a starting material and the addition of substances that reduce the dense sintering temperature. The α-Al 2 O 3 sintering material has a content of 95 to 100 mass% of α-Al 2 O 3 , a sintered density greater than 3.93 g/cm 3 , and a dimensionless defect density of the sintered material of no more than 3*10 -2 and is characterized in that metal-fluorine compounds are added to the sintering material. The sintered material has an average microstructure grain size d 50 of less than 0.5 µm. The strength of the sintered material is at least 700 MPa. The invention further relates to a method for producing high-density, submicrocrystalline, ceramic molded bodies having high strength from said α-Al 2 O 3 sintering material and to the use thereof. The method comprises the steps of mixing, dispersing, thermally and pressure treating, and shaping the sintering material and machining the molded body.
摘要:
The invention relates to the field of ceramics, more specifically to a corundum material that is suitable for imitating colored corundum gems (rubies and sapphires) due to the optical properties thereof, and a method for producing molded objects from said material. The aim of the invention is to develop a corundum material that is provided with a corundum grain size which is as small as possible and a chromophoric dopant distribution which is as homogeneous as possible. Said aim is achieved by a colored transparent corundum material which is made of a polycrystalline sub-µm structure having an average particle size of