摘要:
Die Erfindung betrifft eine Schlichte zur Herstellung einer dauerhaften, fest haftenden Trennschicht auf einem Substrat, umfassend eine Suspension von Feststoffteilchen, wobei die Feststoffteilchen 67-95 Gew.-% Siliciumnitrid und 5-33 Gew.-% eines SiO 2 -basierten Hochtemperaturbindemittels umfassen, wobei das SiO 2 -basierte Hochtemperaturbindemittel aus SiO 2 -Vorstufen abgeleitet ist und durch Temperaturbehandlung in einem Temperaturbereich von 300-1300°C vorbehandelt worden ist. Ferner betrifft die Erfindung Formkörper aus einem Substrat mit einer dauerhaften, fest haftenden Trennschicht sowie Verfahren zu deren Herstellung. Die erfindungsgemäßen Formkörper eignen sich auf dem Gebiet der korrosiven Nichteisenmetallschmelzen.
摘要:
A method is disclosed for manufacturing a zircon composition, the method comprising contacting a zircon powder with a sintering aid, wherein the sintering aid is in the form of a liquid, a sol, or a combination thereof. Also disclosed are methods for forming the zircon composition into a desired shape and for firing a composition to produce a ceramic body. The zircon composition and ceramic body produced by the described methods are also disclosed.
摘要:
Improved silicon carbide particles, improved silicon carbide abrasive particles, and abrasive slurry compositions for use chemical mechanical planarization (CMP) processes, the particles can comprise nano-sized carbide particles, particularly silicon carbide particles having a surface chemistry similar to silica.
摘要:
Superabrasive elements, methods of fabricating such elements, and applications utilizing such elements. In one embodiment, a superabrasive element includes a mass of polycrystalline diamond including ultra-dispersed diamond grain structures present in an amount greater than zero weight percent and less than about 75 weight percent of the mass of polycrystalline diamond. Various structures and apparatuses that utilize the superabrasive elements, such as polycrystalline diamond compacts (PDCs) and drill bits are disclosed. Methods of manufacture are also disclosed.
摘要:
There is provided a metal oxide having a continuous nano-fiber network structure as a negative active material for a secondary battery. A method for fabricating such negative active material for a secondary battery comprises spinning a mixed solution of a metal oxide precursor and a polymer onto a collector to form composite fibers mixed with the metal oxide precursor and the polymer, thermally compressing or thermally pressurizing the composite fibers, and thermally treating the thermally compressed or thermally pressurized composite fibers to remove the polymer from the composite fiber.
摘要:
A transparent yttrium aluminum garnet precursor composition is provided that includes a plurality of calcined particles of yttrium aluminum oxide having a mean particle domain size of between 10 and 200 nanometers and a predominant hexagonal crystal structure. High levels of YAG transparency are obtained for large YAG articles through control of the aluminum:yttrium atomic ratio to 1:06 ± 0.001 and limiting impurity loadings to less than 100 ppm. The composition is calcined at a temperature between 700° Celsius and 900° Celsius to remove organic additives to yield a predominant metastable hexagonal phase yttrium aluminum oxide nanoparticulate having an atomic ratio of aluminum: yttrium of 1:0.6 ± 0.001. With dispersion in an organic binder and a translucent YAG article is formed having a transmittance at a wavelength of 1064 nanometers of greater than 75%. The translucent YAG article is characterized by an average domain size of less than 1 micron and having a density of at least 99% and inclusions present at less than 2 surface area percent. The ability of a batch of yttrium aluminum oxide nanoparticles to serve as a transparent YAG precursor includes collecting an X-ray fluorescence spectrum from a plurality of aluminum oxide nanoparticles having a predominant crystal structure other than garnet to yield an A1:Y raw integrated peak intensity ratio. The nanoparticles are sintered to yield a predominant garnet phase and a secondary phase and optionally isostatic pressing during sintering. By using only precursor nanoparticles with a standard deviation of ±0.003 in the peak ratio exceptionally high transparency YAG is reproducibly produced.
摘要:
The production of ultrafine metal carbide powders from solid metal carbide and nitrogen-containing material is disclosed. The starting materials are fed together or separately to a plasma system where the solid metal carbide is melted and/or vaporized in the presence of nitrogen to form ultrafine metal carbide particles of high purity.
摘要:
Matériau céramique réfractaire possédant une température de solidus comprise entre 25000°C et 28000°C, présentant une compacité supérieure à 85 % et dont la microstructure est telle que le matériau est composite et comprend : des grains de dioxyde de hafnium HfO 2 de structure monoclinique (1); des grains de dioxyde de hafnium HfO 2 de structure cubique (2) stabilisée par de l'oxyde d'yttrium Y 2 O 3 , l'oxyde d'yttrium Y 2 O 3 représentant 0, 5 % à 8 % en moles par rapport au nombre total de moles de dioxyde de hafnium HfO 2 ; des pores fermés (3); des pores ouverts qui ne sont pas interconnectés. L'invention concerne également le procédé de fabrication dudit matériau et une pièce de structure incorporant ledit matériau.
摘要翻译:具有25000℃至28000℃之间的固相线温度的耐火陶瓷具有大于85%的致密度,所述陶瓷的微观结构使得它是复合材料,并且包括:二氧化铪HfO 2单晶单晶晶粒 结构(1); 二氧化铪由氧化钇Y 2 O 3 3稳定的立方结构(2)的二氧化铪HfO 2 2晶体,氧化钇Y 2 < 相对于二氧化铪HfO 2的总摩尔数,代表0,5摩尔%至8摩尔%的N 3 O 3。 闭孔(3)和非互连的开孔。 本发明还涉及制造所述陶瓷的方法和涉及所述陶瓷的结构部件。