摘要:
The invention provides an assembly structure for facilitating assembly of laminated cells, for reducing the possibility of gas leakage and for preventing the reduction of generating efficiency of cells due to gas leakage. In a disclosed embodiment, a plate-shaped electrochemical cell 9 made of a ceramic material with a through hole 9a formed therein is held by a holding member 1. The member 1 is made of a ceramic material and has a plate-shaped main body 1a of a shape of a flat plate and a protruded portion 1b. A first supply hole 2A for supplying one gas and a second supply hole 2B for supplying the other gas are formed in the holding member 1. The main body 1a has a sealing surface 1c against the one main face 9a of the cell 9 while the protruded portion 1b is inserted into the through hole 9a.
摘要:
The invention provides an assembly structure for facilitating assembly of laminated cells, for reducing the possibility of gas leakage and for preventing the reduction of generating efficiency of cells due to gas leakage. In a disclosed embodiment, a plate-shaped electrochemical cell 9 made of a ceramic material with a through hole 9a formed therein is held by a holding member 1. The member 1 is made of a ceramic material and has a plate-shaped main body 1a of a shape of a flat plate and a protruded portion 1b. A first supply hole 2A for supplying one gas and a second supply hole 2B for supplying the other gas are formed in the holding member 1. The main body 1a has a sealing surface 1c against the one main face 9a of the cell 9 while the protruded portion 1b is inserted into the through hole 9a.
摘要:
An assembly structure for facilitating assembly of laminated cells, for reducing the possibility of gas leakage and for preventing the reduction of generating efficiency of cells due to the gas leakage is provided. A plate-shaped electrochemical cell made of a ceramic material with a through hole formed therein is held by a holding member. The holding member is made of a ceramic material having a planar main body with a protruded portion. A first supply hole for supplying a first gas and a second supply hole for supplying a second gas are formed in the holding member. The planar main body of the holding member has a first sealing surface against a first surface of the electrochemical cell while the protruded portion is inserted into the through hole.
摘要:
To improve the precision of the cooling fine holes of a large-sized and complex-shaped ceramic gas-turbine nozzle with fine cooling holes, a ceramic gas-turbine nozzle with fine cooling holes has a profile degree of 1.0% or less relative to the blade length, a roundness of the fine cooling holes of 0.3 mm or less, and a straightness of the fine cooling holes of 1% or less relative to the blade length. This nozzle is prepared by a method in which two compacts of shroud portions and at least one compact of a blade portion and separately molded are joined by isotropic press molding to be calcined, and the predetermined positions of the resulting calcined compact are subjected to supersonic processing to bore cooling fine holes. The resulting compact is then fired.
摘要:
To improve the precision of the cooling fine holes of a large-sized and complex-shaped ceramic gas-turbine nozzle with fine cooling holes, a ceramic gas-turbine nozzle with fine cooling holes has a profile degree of 1.0% or less relative to the blade length, a roundness of the fine cooling holes of 0.3 mm or less, and a straightness of the fine cooling fine holes of 1% or less relative to the blade length. This nozzle is prepared by a method in which two compacts of shroud portions and at least one compact of a blade portion and separately molded are joined by isotropic press molding to be calcined, and the predetermined positions of the resulting calcined compact are subjected to supersonic processing to bore cooling fine holes, the resulting compact is then fired.
摘要:
A ceramic blade for a hybrid type gas turbine blade has a dovetail portion, a platform portion formed on the dovetail portion and blade portions formed on the platform portion. The number of the blade portions formed on one platform portion is two or more. The upper surface of the platform portion is shaped into an arc-like form, and the dovetail portion is linearly formed in a tangential direction to a turbine rotation direction. By the utilization of this blade, the hybrid type gas turbine blade can inhibit the leakage of a gas and can be easily manufactured and is excellent in durability.
摘要:
A method for manufacturing a ceramic shell-and-tube type heat exchanger having a plurality of heat transfer tubes and tubular plates joined to both the end portions of these heat transfer tubes which has the steps of inserting the heat transfer tubes of sintered tubular ceramics into through-holes of the tubular plates of unsintered plate-like ceramics having a plurality of the through-holes, standing the heat transfer tubes vertically to a floor surface, and then firing them in a condition where the tubular plates are positioned at both the upper and lower end portions of the heat transfer tubes, thereby integrally joining the tubular plates to both the end portions of the plurality of heat transfer tubes by the utilization of a difference between firing shrinkage ratios of both the members, the method having the steps of interposing at least one tubular plate between the tubular plate positioned at the upper end portions and the tubular plate positioned at the lower end portions of the heat transfer tubes, and then firing them to integrally join them. The ceramic shell-and-tube type heat exchanger can be obtained in which the deformation of the heat transfer tubes can be remarkably inhibited and which is free from the deterioration of joining strength due to the deformation of the heat transfer tubes in the firing join step and the occurrence of gas leakage due to a joining failure.
摘要:
A method for manufacturing a ceramic shell-and tube type heat exchanger provided with fins includes the steps of: inserting heat transfer tubes of sintered tubular ceramic into throughholes of tubular plates of unsintered plate-like ceramic each having a plurality of the throughholes for fixing the heat transfer tubes inserted thereinto; standing the heat transfer tubes vertically to a floor surface; positioning the tubular plates at both the upper and lower end portions of the heat transfer tubes; disposing between the tubular plates many fin plates of unsintered ceramic so as to pile up the fin plates in the direction of a length of the heat transfer tubes, each of the fin plates including a thin plate having a plurality of throughholes for fixing the heat transfer tubes inserted thereinto, and protrusions formed on both edge portions of the thin plate; firing the components so as to unitarily join them by the utilization of differences of firing shrinkage ratios among the heat transfer tubes, the tubular plates, and the fin plates; and removing the protrusions from the fin plates.
摘要:
In a manufacturing method of a valve plate for a compressor according to this invention, a punch die 43 formed with a convex and concave configuration at its tip end face 42 is set at a press machine 41, and the punch die 43 is depressed against a surface of a valve plate 9 to transfer the convex and concave configuration of the tip end face 42. Thus, peripheral portions of a suction port and a discharge port of the valve plate 9 are roughened.
摘要:
A method for manufacturing ceramics with fine hole(s) includes the steps of: forming independently ceramic compacts, said ceramic compacts having their shapes corresponding to the divided parts of one integrated body having at least one fine hole along which the integrated body is divided; joining said compacts into an integrated form by cold isostatic pressing (CIP); and firing the integrated compact. Another method for manufacturing ceramics with fine hole(s) includes the steps of: forming independently ceramic compacts; grooving said compacts to make at least one desired partial hole in given places of each cross section by machining; joining said compacts into an integrated form by cold isostatic pressing (CIP); and firing the integrated compact. According to these methods, there can be obtained a sintered ceramic body with holes, each having a very small diameter and an unrestricted depth, or holes in a complex or curved shape.