摘要:
The high purity C/C composite formed by graphitizing a molded member packed with carbon fibers and carbon material of a matrix. The carbon fibers are high purified under halogen gas atmosphere. The purified carbon fibers are molded into the desired shape on a tool or in die with infiltrating the matrix. The molded member packed with carbon fibers and carbon material of the matrix are either independently or simultaneously graphitized and then high-purification under halogen gas atmosphere. According to the present process, the metal impurities can be very low contents.
摘要:
The present invention is directed to a single crystal pulling crucible of carbon fiber reinforced carbon composite material formed by the filament windings by combination of axially reinforced layers as well as circumberentially reinforced layers, which combination is given in two or more sets, and to the producing method thereof. The circumferentially reinforced layers resist a force tending to exapand a drum portion of the crucible, and the axially reinforced layers resist a force tending to push down a bottom of the crucible. The axially reinforced layers extending from the bottom portion to the drum portion can be formed by at least either of a level winding of a contact angle of 0.degree. to 10.degree. with respect to the center axis and a poral winding, and the circumferentially reinforced layers in area adjacent to the drum portion out of the drum portion and the bottom portion can be formed by at least either of a parallel winding of a contact angle of 70.degree. to 90.degree. with respect to the center axis and a helical winding. When the axially reinforced layers cover the center of the bottom portion, an integral crucible of C/C composite material with no hole is provided. When the surface of the C/C composite material is impregnated and covered with a pyrolytic carbon, improved resistance to forming SiC is provided.
摘要:
A mandrel for producing a large quartz glass body, comprising at least two columnar or cylindrical, carbon fiber-reinforced carbon composite members and joined in series by screw thread parts, wherein preferably the contact surface of the screw thread parts of the mandrel is impregnated and/or coated with carbon, and more preferably a reinforcing member made of a C/C composite is provided on the outer periphery of the screw thread parts.
摘要:
A C/C composite material and a method of manufacturing the same are provided that can improve the thermal conductivity in a stacking direction at room temperature while at the same time improving the flexural strength and the interlaminar shear strength. A C/C composite material includes a laminated material having two or more layered materials (1) laminated on one another, each of the layered materials (1) having a felt (10) and carbon fiber unidirectional cloths (11), (12), and contains a matrix component made of a vapor-phase pyrolytic carbon inside the laminated material. The extending direction of the carbon fibers in the carbon fiber unidirectional cloth (11) is arranged to be at a right angle to the extending direction of the carbon fibers in the carbon fiber unidirectional cloth (12), and the carbon fibers of the felt (10) are disposed in the stacking direction of laminated material by needle punching.
摘要翻译:提供C / C复合材料及其制造方法,其可以提高室温下层叠方向的导热性,同时提高弯曲强度和层间剪切强度。 AC / C复合材料包括具有彼此层叠的两层以上层叠材料(1)的层叠材料,具有毡(10)和碳纤维单向布(11),(12), 并且在层压材料内含有由气相热解碳制成的基体成分。 碳纤维单向布(11)中的碳纤维的延伸方向被布置成与碳纤维单向布(12)中的碳纤维的延伸方向成直角,并且毛毡的碳纤维 10)通过针刺在层压材料的层叠方向上配置。
摘要:
A carbon fiber reinforced carbon composite, obtained by a method comprising impregnating a pitch or a resin into a molded member formed of carbon fibers for densification thereof; forming an impregnated pyrolytic carbon layer by CVI after densification; and forming a coated pyrolytic carbon layer on the impregnated pyrolytic carbon layer by CVD; a method of making the carbon fiber reinforced carbon composite; and a pulling single crystal member made from the carbon fiber reinforced carbon composite.
摘要:
A mandrel for producing quartz glass, comprising at least two columnar or cylindrical, carbon fiberreinforced carbon composite material made members joined in series by screw thread parts. The mandrel is carbonimpregnated and/or carbon-coated on the screw thread parts, and, in addition, may be provided with reinforcing members on the outer sides of the screw thread parts. Quartz glass fine particles obtained by flame-hydrolyzing a volatile silicon compound are deposited, using this mandrel, on the surface of a heat-resisting substratum or on a starting rod at the end of the mandrel to easily form a large porous quartz glass mother material, the porous quartz glass mother material is dehydrated and transparently vitrified to produce a large optical fiber mother material, and further the optical fiber mother material is drawn to produce a low-cost, high-precision optical fiber. In addition, a columnar or cylindrical mandrel for producing quartz glass is disposed at the center of a heat-resisting mold, is filled with silicon dioxide power, and melt in a heating furnace for vitrifying, thereby producing a large, high precision quartz glass body at low costs.
摘要:
A benzylated lignocellulosic substance obtained through benzylation, wherein 46 to less than 97% of lignin-carbohydrate complex (LCC) contained in a wood raw material from which the substance is formed remains.
摘要:
A high-temperature gas reactor control rod is provided that does not degrade the joining state between the control rod elements even when stress is applied thereto, and that can improve the safety of the high temperature gas reactor remarkably by improving the heat resistance thereof.The high-temperature gas reactor control rod has a plurality of control rod elements (1) each having a neutron absorber (7) between an outer cylinder (9) and an inner cylinder (8) that form a double cylindrical tubular shape, the control rod elements (1) joined to each other in a vertical direction, characterized by: a columnar support member (2) for supporting at least the neutron absorber (7), disposed in the inner cylinder (8); and joining means for joining to another control rod element (1), provided at least one of upper and lower ends of the support member (2).
摘要:
A high-temperature gas reactor control rod is provided that does not degrade the joining state between the control rod elements even when stress is applied thereto, and that can improve the safety of the high temperature gas reactor remarkably by improving the heat resistance thereof.The high-temperature gas reactor control rod has a plurality of control rod elements (1) each having a neutron absorber (7) between an outer cylinder (9) and an inner cylinder (8) that form a double cylindrical tubular shape, the control rod elements (1) joined to each other in a vertical direction, characterized by: a columnar support member (2) for supporting at least the neutron absorber (7), disposed in the inner cylinder (8); and joining means for joining to another control rod element (1), provided at least one of upper and lower ends of the support member (2).
摘要:
A high-purity carbon fiber reinforced carbon composite formed by a process which entails graphitizing a molded member packed with carbon fibers, which fibers are subjected to a purification process under halogen gas prior to being graphitized and prior to being packed with a matrix of carbon material, and the matrix of carbon material, the carbon fiber reinforced carbon composite having an impurities content of not more than 30 ppm in ash content and satisfies either or both of the following conditions for impurities: (1) V is not more than 0.12 ppm by ICP-OES; and (2) Fe is not more than 0.10 ppm by ICP-OES.