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    • 45. 发明授权
    • Method of making thermal-shock resistant molded articles on the basis of
silicon carbide
    • 基于碳化硅制造耐热冲击模制品的方法
    • US4514346A
    • 1985-04-30
    • US418679
    • 1982-09-16
    • Hartmut LuhleichFrancisco J. Dias
    • Hartmut LuhleichFrancisco J. Dias
    • C04B35/64B01J20/28C04B35/573C04B35/34
    • C04B35/573
    • Refractory parts or articles, even of very large dimensions, are made with starting material of carbon particles mixed with silicon particles in a predetermined ratio which is suspended in a solution of a binder, after which the suspension is squirted into a precipitating liquid to coat the particles with the binder, the solids then being separated and dried, molded under slight pressure, and coked (at 800.degree.-1,000.degree. C.), and then rapidly raised in temperature (to 1,400.degree.-1,600.degree. C.) for formation of silicon carbide throughout the article. It is useful to add powdered silicon carbide and mix it in before the coking step and, also, to hold the heated body at a temperature somewhat below 1,400.degree. C. long enough to remove temperature gradients within it, followed by rapid heating up to a carbide-forming temperature. The porous bodies thus formed can be heated to reduce porosity after the coking step by impregnation with a suspension of silicon powder in a resin, after which the body is again coked, or impregnation may be carried out on the completely fired body, with a liquid resin or a molten metal, after evacuation of the porous body and the application of pressure to the impregnating fluid.
    • 即使是非常大的尺寸的耐火部件或制品也是以预定比例的与硅颗粒混合的碳颗粒的原料制成的,悬浮在粘合剂溶液中,然后将悬浮液喷射到沉淀液中以涂覆 颗粒与粘合剂,固体分离和干燥,在轻微压力下成型,并焦化(在800°-1000℃),然后在温度(至1400°-1,600℃)迅速升高以形成 的碳化硅。 添加粉末状碳化硅并在焦化步骤之前将其混合是有用的,并且还将加热体保持在低于1400℃的温度下足够长以除去其内的温度梯度,随后快速加热至 碳化物形成温度。 这样形成的多孔体可以在焦化步骤之后通过用硅粉末悬浮液浸渍在树脂中而减少多孔体,之后再次将炭体焦化,或者在完全烧制的体上进行浸渍,用液体 树脂或熔融金属,在多孔体排空之后并对浸渍流体施加压力。
    • 48. 发明专利
    • MICROWAVE RESISTOR AND PRODUCTION THEREOF
    • JPH0218353A
    • 1990-01-22
    • JP16839188
    • 1988-07-05
    • NEC CORP
    • OKAZAKI TAKEOTAKAMIZAWA HIDEO
    • C01G49/00C04B35/10C04B35/34
    • PURPOSE:To obtain a microwave resistor wherein reflection loss, resistance to electric power property and deflexion strength are improved by mixing alumina powder with cobalt zinc ferrite powder and sintering the mixture at the specified conditions. CONSTITUTION:The aimed microwave resistor is obtained by regulating cobalt zinc ferrite powder to 20-80wt.% and mixing alumina powder of residual ratio with this powder and sintering this mixture while holding it at a temp. range of 1,400-1,500 deg.C for one hour or more. By the above method, the excellent microwave resistor which has mechanical strength (resistance strength) larger at two times or more, allowable electric power larger at 10 times or more and reflection loss not less than 20dB in comparison with cobalt zinc ferrite is obtained. When the ratio of ferrite powder is less than 20%, reflection loss is small and improvement effect is eliminated. When the mixed powder is held at 1,550 deg.C for one hour and sintered, one part is melted and it is made extremely difficult that the mixed powder is worked into a required shape and dimension.