Abstract:
The present invention provides a low cost preparation of ultra-low CTE and low dielectric loss high temperature co-fired ceramic (HTCC) substrates for highly integrated monolithic millimeter-wave integrated circuits (MMICs) utilized in high temperature environment. This HTCC zircon substrate is advantageous over currently available HTCC substrates in terms of cost effectiveness, excellent dielectric properties, close to zero thermal expansively, high thermal conductivity and good mechanical properties.
Abstract:
Ceramic particles for use in a solar power tower and methods for making and using the ceramic particles are disclosed. The ceramic particle can include a sintered ceramic material formed from a mixture of a ceramic raw material and a darkening component comprising MnO as Mn 2+ . The ceramic particle can have a size from about 8 mesh to about 170 mesh and a density of less than 4 g/cc.
Abstract:
This sintered body has a first material, a second material, and a third material. The first material is a cubic boron nitride. The second material is a compound including zirconium. The third material is an aluminum oxide which includes fine aluminum oxide. The sintered body has a first region in which the fine aluminum oxide is dispersed in an amount of 5% to 50% by volume in the second material. Along any straight line in the first region, an average value of a continuous distance occupied by the fine aluminum oxide is 0.08 μm or less, and a standard deviation of the continuous distance occupied by the fine aluminum oxide is 0.1 μm or less.
Abstract:
The present invention relates to refractories with a composition gradient for lining the interior surface of combustion chambers. The invention envisages the use of refractories characterized by the presence of a number of layers with a different chemical composition to form a gradient along the cross section of the material. The presence of the composition gradient serves to combine the corrosion resistance of the surface layer, facing towards the inside of the combustion chamber, with the shock resistance of the bulk material.
Abstract:
A SiAlON composite according to an embodiment of the present disclosure comprises a SiAlON phase including α-SiAlON phase, β-SiAlON phase and grain boundary phase. The SiAlON composite is prepared from a starting powder mixture including a silicon nitride powder and at least one powder providing aluminum, oxygen, nitrogen, yttrium (Y) and erbium (Er) to the SiAlON composite. The SiAlON composite contains the SiAlON phase of at least 90 vol%, z-value of the β-SiAlON phase ranges between 0.27 and 0.36 and thermal diffusivity of the SiAlON composite is equal to or greater than 2.4 (mm 2 /sec) and equal to or less than 5.2 (mm 2 /sec).
Abstract:
A method of forming a super hard polycrystalline construction comprises forming a liquid suspension of graphene and grains of super hard material, dispersing the graphene and super hard grains in the liquid suspension to form a substantially homogeneous suspension which is dried and from which a pre-sinter assembly is formed and then treated to create a sintered body of polycrystalline super hard material comprising a first fraction of super hard grains and a second fraction of diamond grains,the graphene being at least partially converted to diamond during the sintering stage to form the second fraction. The super hard grains in the first fraction are bonded along at least a portion of the peripheral surface to at least a portion of a plurality of diamond grains in the second fraction, and have a greater average grain size than that of the grains in the second fraction which isbetween 60nm to 1 micron.
Abstract:
Das Verfahren (S1, S1a, S1b, S1c) dient zum Herstellen eines Schlickers, wobei mindestens ein anorganischer Bestandteil mit mindestens einem ersten Binder vermischt wird und der erste Binder eine Mischung aus mindestens einem Epoxidharz und mindestens einem sterisch gehinderten Amin als Härtungsmittel aufweist. Ein Bauteil ist mittels eines solchen Schlickers hergestellt worden. Die Erfindung ist insbesondere anwendbar zur kostengünstigeren Herstellung von komplexen Metallschaufeln in Gas- und Antriebsturbinen aller Art.