67results about How to "Well matched thermal expansion" patented technology

A MEMS microphone system suited for harsh environments. The system uses an integrated circuit package. A first, solid metal lid covers one face of a ceramic package base that includes a cavity, forming an acoustic chamber. The base includes an aperture through the opposing face of the base for receiving audio signals into the chamber. A MEMS microphone is attached within the chamber about the aperture. A filter covers the aperture opening in the opposing face of the base to prevent contaminants from entering the acoustic chamber. A second metal lid encloses the opposing face of the base and may attach the filter to this face of the base. The lids are electrically connected with vias forming a radio frequency interference shield. The ceramic base material is thermally matched to the silicon microphone material to allow operation over an extended temperature range.

A ferritic stainless steel having improved high temperature mechanical properties includes greater than 25 weight percent chromium, 0.75 up to 1.5 weight percent molybdenum, up to 0.05 weight percent carbon, and at least one of niobium, titanium, and tantalum, wherein the sum of the weight percentages of niobium, titanium, and tantalum satisfies the following equation:The coefficient: of thermal expansion of the ferritic stainless steel is within 25 percent of the CTE of stabilized zirconia between 20° C. (68° F.) and 1000° C. (1832° F.), and the steel exhibits at least one creep property selected from creep rupture strength of at least 1000 psi at 900° C. (1,652° F.), time to 1% creep strain of at least 100 hours at 900° C. (1652° F.) under load of 1000 psi, and time to 2% creep strain of at least 200 hours at 900° C. (1652° F.) Under load of 1000 psi. The steel is particularly suited for high temperature applications including, but not limited to, current collecting interconnects in solid oxide fuel cells, furnace hardware, equipment for the chemical process, petrochemical, electrical power generation, and pollution control industries, and equipment for handling molten copper and other molten metals.

The invention relates to a low-temperature solid oxide fuel cell and a making method thereof. The structure of the low-temperature solid oxide fuel cell comprises an anode film deposited on the inner wall of a porous perovskite structure oxide ceramic La1-xSrxGa1-yMgyO3-delta composite film, a cathode film deposited on the inner wall of the porous perovskite structure oxide ceramic La1-xSrxGa1-yMgXO3-delta composite film, and a compact perovskite structure oxide ceramic La1-xSrxGa1-yMgyO3-delta electrolyte film positioned between the anode film and the cathode film, wherein each of x, y and delta is equal to or more than 0 and equal to or lower than 0.2, and the perovskite structure oxide ceramic La1-xSrxGa1-yMgyO3-delta composite film is formed through a porous perovskite structure oxide ceramic La1-xSrxGa1-yMgyO3-delta substrate, the perovskite structure oxide ceramic La1-xSrxGa1-yMgyO3-delta and a porous perovskite structure oxide ceramic La1-xSrxGa1-yMgyO3-delta film. The invention also provides the making method of the low-temperature solid oxide fuel cell.

The invention relates to a preparation process of a carbon fiber concave reflector, which belongs to the technical field of optical element preparation. The invention solves the problems of high manufacturing process cost of the carbon fiber concave reflector, difficult mold processing and the like in the prior art. In the preparation process of the present invention, optical glass is firstly used as a material to prepare a concave reflector mold having the same structure as the carbon fiber concave reflector to be prepared, and then a release agent is applied on the concave reflector mold and multiple layers are spread on the release agent. layer of carbon fiber prepreg, solidify and mold the laid carbon fiber prepreg, and demould to obtain a convex carbon fiber mirror mold, and then apply a release agent on the convex carbon fiber mirror mold and lay multiple layers of carbon fiber prepreg on the release agent. Soak the cloth, solidify and mold the laid carbon fiber prepreg cloth, and demould to obtain a concave carbon fiber reflector blank; finally, carry out surface treatment on the concave carbon fiber reflector blank to obtain a carbon fiber concave reflector. The preparation process is simple and easy, the cost is low, and the prepared reflection mirror has high precision.

A method of fabricating suspended beam silicon carbide microelectromechanical (MEMS) structure with low capacitance and good thermal expansion match. A suspended material structure is attached to an anchor material structure that is direct wafer bonded to a substrate. The anchor material structure and the suspended material structure are formed from either a hexagonal single-crystal SiC material, and the anchor material structure is bonded to the substrate while the suspended material structure does not have to be attached to the substrate. The substrate may be a semi-insulating or insulating SiC substrate. The substrate may have an etched recess region on the substrate first surface to facilitate the formation of the movable suspended material structures. The substrate may have patterned electrical electrodes on the substrate first surface, within recesses etched into the substrate.