Abstract:
A Si uN u polycrystalline ceramic body consisting essentially of a first phase of Si uN u and a second intergranular phase comprising SiO u and a densifying additive, wherein the intergranular phase is substantially completely crystalline. The Si uN u body is prepared by sintering a body of particulate material which is free of glass forming impurities or sintering and heat treating a body of particulate material which contains glass forming impurities.
Abstract translation:一种基本上由SiuNu的第一相组成的Si u U u多晶陶瓷体和包含SiO 2的第二晶间相和致密化添加剂,其中晶间相为 基本上完全结晶。 通过烧结不含玻璃形成杂质或烧结和热处理含有玻璃形成杂质的颗粒材料的体的颗粒材料体来制备硅酸盐体。
Abstract:
Die vorliegende Erfindung betrifft eine gesinterte Siliziumnitridkeramik, welche insbesondere eine Komponente eines Wälz- oder Gleitlagers bildet. Im Weiteren betrifft die Erfindung ein Verfahren zur Herstellung einer solchen Siliziumnitridkeramik. Das Verfahren umfasst zunächst einen Schritt, in welchem Siliziumnitrid Si 3 N 4 bereitgestellt wird. Weiterhin wird ein erstes Additiv bereitgestellt, welches in Form von Primärpartikeln einer durchschnittlichen Primärpartikelgröße von weniger als 1µm vorliegt. Das erste Additiv fungiert als Sinterhilfe. In einem weiteren Schritt des erfindungsgemäßen Verfahrens werden das Siliziumnitrid und das erste Additiv zu einer Mischung vermischt. Die Mischung wird anschließend zu einem Grünling geformt, welcher daraufhin zu einer Siliziumnitridkeramik gesintert wird. Dabei wird neben dem Siliziumnitrid auch das erste Additiv zu einem Bestandteil der Siliziumnitridkeramik.
Abstract:
A method is disclosed for forming a blended phosphor composition. The method includes the steps of firing precursor compositions that include europium and nitrides of at least calcium, strontium and aluminum, in a refractory metal crucible and in the presence of a gas that precludes the formation of nitride compositions between the nitride starting materials and the refractory metal that forms the crucible. The resulting compositions can include phosphors that convert frequencies in the blue portion of the visible spectrum into frequencies in the red portion of the visible spectrum.
Abstract:
Light emitting device with a light source to emit primary light and a light conversion layer to convert at least a part of the primary light into secondary light comprising a CaAlSiN light converting material with a transmissivity of > 10% to ≤ 80% for a light in the wavelength range from > 580 to ≤ lOOOnm.
Abstract:
A rolling unit which has rolling elements comprising a sintered compact of alumina having an alumina content of 99.5 mass % or more and exhibiting a flexural strength of 320 MPa or more as measured by a three-point bending test according to JIS-R1601, wherein the sintered compact of alumina is composed of crystal grains having an average grain diameter of 2 mum or less and a ratio of the standard deviation thereof to the average grain diameter of 0.4 or less, and has an inner ring and an outer ring both comprising the above sintered compact of alumina, a sintered compact of zirconia or a synthetic resin. The rolling unit allows the provision of a rolling bearing which has an excellent corrosion resistance and also is free from the occurrence of dry friction between a rolling element and a raceway groove even when a liquid present within the bearing is of a trace amount, and thus can maintain stable performance for a long period of time.