摘要:
Die vorliegende Erfindung betrifft ein Syntheseverfahren zur Herstellung eines feuerfesten oxidkeramischen Werkstoffes aus CaZrO 3 , insbesondere in Form einer feuerfesten, vorzugsweise mechanisch zerkleinerten, insbesondere gebrochenen und/oder gemahlenen, Körnung, sowie einen Versatz und ein grobkeramisches geformtes oder ungeformtes feuerfestes Erzeugnis enthaltend zumindest eine vorsynthetisierte calciumzirkonathaltige feuerfeste Körnung.
摘要:
A ceramic product which has a very silica content is created by mixing traditional raw materials with a greater than usual proportion (>75%) of ground silica to create a homogenous mixture. The mixture can be extruded, cast, sculpted, or rammed to create a green product of the required shape and dimensions. The green product is then baked at a temperature of less than 700 degrees Fahrenheit for 20-40 minutes to create a finished ceramic product which has between 90-110 parts Ground Silica, 2-4 parts Bentonite and 40-46 parts Sodium Silicate. Processes for creating the ceramic products are disclosed.
摘要:
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.
摘要:
본 발명은 탄화규소 원료물질 및 소결조제 원료물질을 기계적 합금화(mechanical alloying) 공정에 의해 합성 분말로 제조하는 단계; 및 상기 합성 분말을 소결하는 단계를 포함하고, 상기 소결조제는 Al-C계, Al-B-C계 및 B-C 계로 이루어지는 군에서 선택되는 적어도 어느 하나인 것을 특징으로 하는 탄화규소 소결체의 제조방법 및 이에 따른 탄화규소 소결체에 관한 것으로, 저온에서 소결되면서도 치밀화되며, 높은 강도 및 전기전도성을 갖는 탄화규소 소결체를 제조할 수 있다.
摘要:
An abrasive particle includes a body having at least one microstructural characteristic including average crystal size of not greater than 6 microns or a hardness of at least 20 GPa, and wherein the body further has at least one deformation characteristic including a primary deformation amplitude of not greater than 30 percent, a primary deformation time of not greater than 280 minutes, or a secondary deformation characteristic rate of not greater than 6x10-3 percent/minute.
摘要:
The present invention provides a process for the preparation of a prepreg for a ceramic matrix composite material, said process comprising the steps of: a) impregnating an arrangement of ceramic fibers with a slurry of a ceramic powder, which slurry contains: 10 to 40 vol%, based on the total volume of the slurry, of the ceramic powder, 10 to 20 wt%, based on the total weight of the ceramic powder in the slurry, of glycerol, 0 to 2 wt%, based on the total weight of the ceramic powder in the slurry, of an organic binder, and water; b) reducing the water content in the slurry which is retained by the arrangement of ceramic fibers after impregnation so as to increase the volume ratio of the ceramic powder in the slurry and to provide a prepreg containing a slurry of a ceramic powder with a volume ratio of the ceramic powder of 45 vol% or more in the slurry. It further provides a prepreg obtainable from the process. In further aspects of the invention, laminates containing the above prepregs and a process for their production are provided. In yet a further aspect, the invention provides a ceramic matrix composite green body and a process for its preparation, and a process for the preparation of a ceramic matrix composite body, using the prepregs or the laminated prepregs in accordance with the invention.
摘要:
The present application relates to a protective and abradable coating composition for application on rolls and more particularly to conveyor rolls comprising an abradable coating for use in high temperature applications, to a process for making such rolls and to the use thereof. Corrosion by aluminium melt is reduced and build-up substances are removed by friction. The life time of the roll is then increased.
摘要:
The disclosure relates generally to mold compositions and methods of molding and the articles so molded. More specifically, the disclosure relates to silicon carbide-containing mold compositions, silicon carbide-containing intrinsic facecoat compositions, and methods for casting titanium-containing articles, and the titanium-containing articles so molded. A slurry containing silicon carbide and calcium aluminate is introduced in a mold cavity that contains a fugitive pattern. The slurry is cured in the mold, sintered and used for casting a titanium turbine blade.
摘要:
A method of making abrasive particles includes: providing a slurry comprising non-colloidal solid particles and a liquid vehicle; forming at least a portion of the slurry into shaped bodies contacting a substrate; at least partially drying the shaped bodies to provide shaped abrasive precursor particles; separating at least a portion of the shaped abrasive precursor particles from the substrate; and converting at least a portion of the shaped abrasive precursor particles into shaped abrasive particles. The shaped abrasive particles comprise alpha alumina having an average crystal grain size of 0.8 to 8 microns and an apparent density that is at least 92 percent of the true density. Each shaped abrasive particle has a respective surface comprising a plurality of smooth sides that form at least four vertexes. Shaped abrasive particles, abrasive articles including them, and methods of using are also disclosed.
摘要:
The invention relates to a porous dental milling block comprising at least two geometrically defined Material Sections A and B, Material Section A comprising a tetragonal zirconia crystal phase in an amount A-T in % and a cubic zirconia crystal phase in an amount A-C in %, Material Section B comprising cubic zirconia crystal phase in an amount B-T in % and cubic zirconia crystal phase in an amount B-C in %, wherein (amount of tetragonal phase A-T in %) / (amount of cubic phase content A-C in %) > 1 and (amount of tetragonal phase content B-T in %) / (amount of cubic phase content B-C in %)