摘要:
A method of smoothing the surface of a ceramic matrix composite part presenting a surface that is undulating and rough. The method includes forming a ceramic coating on the surface of the part, the coating being made by applying a liquid composition on the surface of the part, the composition containing a ceramic-precursor polymer and a factory solid filler, curing the polymer, and transforming the cured polymer into ceramic by heat treatment. The method further includes impregnating the ceramic coating with a liquid metallic composition.
摘要:
A base plate for power module, comprising an aluminum-silicon carbide composite and aluminum layers made of a metal containing aluminum as the main component formed on respective principal planes of the aluminum-silicon carbide composite, wherein the aluminum-silicon carbide composite is produced by forming or fabricating a flat plate-shaped silicon carbide porous body to have a thickness difference of at most 100 μm in the entire porous body and piling such porous bodies as they are each sandwiched between mold-releasing plates so that the fastening torque in the plane direction becomes from 1 to 20 Nm, and infiltrating a metal containing aluminum as the main component into the silicon carbide porous bodies,wherein the aluminum layers each has an average thickness of from 10 to 150 μm, the difference between the maximum thickness and the minimum thickness of the aluminum layer in each principal plane is at most 80 μm, and the difference between average thicknesses of the aluminum layers on the respective principal planes is at most 50 μm, and wherein the shape of the silicon carbide porous body is rectangle or a rectangle from which peripheral portions encompassing holes are removed.
摘要:
A composite article of ceramic and plastic is provided. The composite article comprises a ceramic substrate defining a receiving portion therein, and at least one plastic member made of thermoplastic resin positioned in the receiving portion.
摘要:
The invention relates to a process of coating fibers with a metal by a liquid method. In this process, a fiber (3) is drawn through a bath (15) of molten liquid metal so as to coated with the latter, the liquid metal bath (15) being maintained in a crucible (9) of the “levitation” type, which at least partly eliminates contact between the liquid metal and the crucible (9). The bath (15) is fed with metal, during the process, by a metal powder (16). Thanks to the invention, the molten metal bath is fed in a simple and effective manner.
摘要:
Surface metallization technology for ceramic substrates is disclosed herein. It makes use of a known phenomenon that many metal-metal oxide alloys in liquid state readily wet an oxide ceramic surface and strongly bond to it upon solidification. To achieve high adhesion strength of a metallization to ceramic, a discrete metallization layer consisting of metal droplets bonded to ceramic surface using metal-metal oxide bonding process is produced first. Next, a continuous metal layer is deposited on top of the discrete layer and bonded to it using a sintering process. As a result a strongly adhering, glass-free metallization layer directly bonded to ceramic surface is produced. In particular, the process can be successfully used to metallize aluminum nitride ceramic with high thermal and electrical conductivity copper metal.
摘要:
The present invention provides a method for applying a tribological coating to a carbon composite substrate. The method includes providing the carbon composite substrate, depositing a layer of carbon on the substrate, applying a layer of aluminum on the layer of carbon, annealing the substrate at a temperature greater than a melting temperature of aluminum, and applying a layer of silver. A layer of mixed aluminum and silver may be substituted for the layer of silver.
摘要:
The invention relates to a method for metallic coating of fibers by liquid technique, in which a fiber, coated with a material forming a diffusion barrier with the metal, is drawn through a liquid metal bath to be coated therewith. The method is characterized in that prior to the passage of the fiber into the bath, the fiber is coated with a compound wettable by the metal. The coating of the fiber by the metal is facilitated by the presence of the compound, forming an interface wettable by the metal.
摘要:
The present invention relates to dielectric ceramics, thin and/or thick layers produced therefrom and a method for the production thereof and the use of the dielectrics and of the thin and/or thick layers.
摘要:
A non-lead composition for use as a thick-film resistor paste in electronic applications. The composition comprises particles of Li2RuO3 of diameter between 0.5 and 5 microns and a lead-free frit. The particles have had the lithium at or near primarily the surface of the particle at least partially exchanged for atoms of other metals.
摘要:
A ceramic composition including a first ceramic material and a second ceramic material that is in the form of nano-, submicron-, or micron-sized particles, in which the first ceramic material has a lower melting point than the second ceramic material, and, when the first ceramic material melts into a liquid and the second ceramic material remains particulate, the second ceramic material floats at the top of the liquid. Also disclosed is a variant of this composition including a first ceramic material and a second ceramic material, in which the second ceramic material has a melting point higher than the first ceramic material, and, when the first ceramic material melts into a liquid, the second ceramic material partially or completely dissolves in the liquid.