摘要:
A carbon material having oxidation resistance is prepared by forming a fi coating constituted mainly by carbon on the surface of a carbon/carbon composite by chemical vapor deposition, then forming on said first coating a second coating of a ceramic or both a ceramic and carbon by chemical vapor deposition, and changing at least one of thermal physical properties or mechanical physical properties of carbon in said first coating continuously or step-wise.
摘要:
A carbon/carbon composite having oxidation resistance is produced by filling the voids of a carbon/carbon composite comprising 10-70% by volume of carbon fibers and 5-90% by volume of a carbonaceous matrix and having a void percentage of 10-55%, with at least one of carbon and a ceramic by chemical vapor infiltration and then coating the deposit surface with a ceramic or both ceramic and carbon by chemical vapor deposition.
摘要:
A process for fabricating a carbon/carbon fiber composite characterized in that one or more kinds of fibers selected from the group consisting of a pitch fiber obtained by spinning a carbonaceous pitch, an infusiblized fiber obtained by subjecting the pitch fiber to an infusiblizing treatment, and a pre-carbonized fiber obtained by subjecting the infusiblized fiber to a pre-carbonizing fiber at 400.degree. to 800.degree. C. in an inert gas atmosphere, are woven, laminated or mix-pulverized together with a pitch-based carbon fiber, and then carbonized under the application of pressure or under pressing.
摘要:
A process for producing a process for producing a two- or three-dimensional carbon fabric, which process includes melt-spinning (a) an optically anisotropic carbonaceous pitch having an optically anisotropic phase content of 60 to 100%, subjecting the thus- infusibilized fibers to a primary heat treatment at a temperature greater than 1000.degree. and not higher than 2500.degree. C. to produce primary heat treated fibers having a tensile strength not lower than 300 kg/mm.sup.2 and a breaking elongation in the range of 0.4% to 10%, preparing a two- or three-dimensional fabric from the primary heat treated fibers and then subjecting the two- or three-dimensional fabric to a secondary heat treatment at a temperature which is at least 50.degree. higher than the temperature used in the primary heat treatment, the temperature in the secondary heat treatment being higher than 1050.degree. C. and no higher than 3300.degree. C.
摘要翻译:一种制备二维或三维碳纤维织物的方法的方法,该方法包括熔融纺丝(a)光学各向异性相含量为60-100%的光学各向异性碳质沥青,将这样的不熔化纤维 在大于1000℃且不高于2500℃的温度下进行一次热处理,以产生拉伸强度不低于300kg / mm 2的一次热处理纤维,并且断裂伸长率在0.4%至10%的范围内 从一次热处理纤维制备二维或三维织物,然后在二次或三维织物在比一次加热中使用的温度高至少50℃的温度下进行二次热处理 二次热处理温度高于1050℃,不高于3300℃。
摘要:
A carbon/carbon composite is prepared by impregnating a bundle of carbon fibers with a polymer of a nitrogen-containing heterocyclic compound, carbonizing the thus-impregnated carbon fiber bundle under pressure or under pressing and, optionally, further carbonizing the thus-carbonized carbon fiber bundle at atmospheric pressure.
摘要:
A carbon/carbon composite is prepared by mixing 100 parts of a carbonaceous pitch with 1-45 parts by weight of at least one aromatic compound containing at least one functional group selected from nitro and hydroxyl groups, then impregnating a bundle of carbon fibers with the resulting mixture, thereafter carbonizing the thus-impregnated carbon fiber bundle under pressure or under pressing, and if necessary, further carbonizing the thus-carbonized carbon fiber bundle at atmospheric pressure.
摘要:
In the process for producing pitch carbon fibers by melt-spinning a carbonaceous pitch, and infusiblizing the resulting pitch fibers followed by carbonization and, additionally as needed, graphitization, the pitch fibers are subjected to infusiblization treatment following application of a dimethyl polysiloxane having a viscosity at 25.degree. C. in the range between 0.5 and 500 cSt and removing said dimethyl polysiloxane by washing prior to the carbonization.
摘要:
Provided is a process for producing a pitch-based graphite fiber, which process comprises treating a pitch fiber in an oxidative gas atmosphere to render it infusible, said pitch fiber being obtained by melt-spinning a carbonaceous pitch, then heat-treating the infusibilized fiber at 400.degree.-750.degree. C. in an inert gas atmosphere to obtain a precarbonized fiber substantially containing oxygen, then raising the temperature to 2,000.degree.-3,000.degree. C. at a rate of 500.degree. C. or higher per minute in an inert gas atmosphere and heat-treating the precarbonized fiber at the raised temperature of 2,000.degree.-3,000.degree. C. in said inert gas atmosphere.
摘要:
A process of manufacturing carbon fibers of high chemical stability comprises reacting feed carbon fibers having an elastic modulus of 30.times.10.sup.3 kgf/mm.sup.2 with a compound of elements capable of forming a carbide ceramics on the carbon fibers peripherally alone or both peripherally and partially internally.
摘要翻译:制造具有高化学稳定性的碳纤维的方法包括使具有30×10 13 kgf / mm 2的弹性模量的进料碳纤维与能够在碳纤维上独立地或外部地和部分内部形成碳化硅陶瓷的元素的化合物反应。
摘要:
In a process for producing carbon fibers from a carbonaceous pitch, the improvement characterized in that an end portion of infusiblized fiber or carbonized fiber to be first subjected to a carbonizing or graphitizing treatment and that of infusiblized fiber or carbonized fiber to be next subjected to the same treatment are bonded together using a composition comprising (a) at least one member selected from the group consisting of phenolic resins and pitches and (b) graphite powder, and the thus-bonded fibers are fed successively to a carbonizing apparatus or a graphitizing apparatus.