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    • 1. 发明授权
    • Thermal insulation for high temperature microwave sintering operations
and method thereof
    • 高温微波烧结操作的绝热及其方法
    • US5449887A
    • 1995-09-12
    • US036763
    • 1993-03-25
    • Cressie E. HolcombeNorman L. DykesMarvin S. Morrow
    • Cressie E. HolcombeNorman L. DykesMarvin S. Morrow
    • H05B6/80
    • H05B6/80
    • Superior microwave transparent thermal insulations for high temperature microwave sintering operations were prepared. One embodiment of the thermal insulation comprises granules of boron nitride coated with a very thin layer of glassy carbon made by preparing a glassy carbon precursor and blending it with boron nitride powder to form a mixture. The blended mixture is granulated to form a grit which is dried and heated to form the granules of boron nitride coated with a glassy carbon. Alternatively, grains of glassy carbon are coated with boron nitride by blending a mixture of a slurry comprising boron nitride, boric acid binder, and methyl alcohol with glassy carbon grains to form a blended mixture. The blended mixture is dried to form grains of glassy carbon coated with boron nitride. In addition, a physical mixture of boron nitride powder and glassy carbon grains has also been shown to be an excellent thermal insulation material for microwave processing and sintering.
    • 制备了用于高温微波烧结操作的优异的微波透明绝热材料。 绝热的一个实施方案包括用非常薄的玻璃碳层涂覆的氮化硼颗粒,其通过制备玻璃碳前体制备并与氮化硼粉末混合以形成混合物。 将混合的混合物造粒以形成砂粒,将其干燥并加热以形成用玻璃碳涂覆的氮化硼颗粒。 或者,通过将包含氮化硼,硼酸粘合剂和甲醇的浆料的混合物与玻璃碳颗粒混合以形成混合的混合物,用氮化硼涂覆玻璃碳颗粒。 将混合的混合物干燥以形成用氮化硼涂覆的玻璃状碳颗粒。 此外,氮化硼粉末和玻璃碳颗粒的物理混合物也被证明是用于微波加工和烧结的优异的绝热材料。
    • 4. 发明授权
    • Method for heat treating and sintering metal oxides with microwave
radiation
    • 用微波辐射热处理和烧结金属氧化物的方法
    • US4880578A
    • 1989-11-14
    • US229892
    • 1988-08-08
    • Cressie E. HolcombeNorman L. DykesThomas T. Meek
    • Cressie E. HolcombeNorman L. DykesThomas T. Meek
    • C04B35/64H05B6/80
    • C04B35/64H05B6/80H05B2206/046
    • A method for microwave sintering materials, primarily metal oxides, is described. Metal oxides do not normally absorb microwave radiation at temperatures ranging from about room temperature to several hundred degrees centrigrade are sintered with microwave radiation without the use of the heretofore required sintering aids. This sintering is achieved by enclosing a compact of the oxide material in a housing or capsule formed of a oxide which has microwave coupling properties at room temprature up to at least the microwave coupling temperature of the oxide material forming the compact. The heating of the housing effects the initial heating of the oxide material forming the compact by heat transference and then functions as a thermal insulator for the encased oxide material after the oxide material reaches a sufficient temperature to adequately absorb or couple with microwave radiation for heating thereof to sintering temperature.
    • 描述了微波烧结材料,主要是金属氧化物的方法。 金属氧化物通常在约室温至数百摄氏度的温度范围内不会吸收微波辐射,而不需要使用迄今为止所需的烧结助剂。 该烧结是通过将氧化物材料的密封件封装在由氧化物形成的壳体或胶囊中而实现的,所述氧化物在室温下具有至少微波耦合温度至少达到形成压块的氧化物材料的微波耦合温度。 壳体的加热通过热转移对形成压块的氧化物材料进行初始加热,然后在氧化物材料达到足够的温度以充分吸收或耦合微波辐射以加热之后用作封装氧化物材料的绝热体 至烧结温度。
    • 5. 发明授权
    • Method of preparing thermal insulation for high temperature microwave
sintering operations
    • 高温微波烧结操作保温方法
    • US5536292A
    • 1996-07-16
    • US518067
    • 1995-08-22
    • Cressie E. HolcombeNorman L. DykesMarvin S. Morrow
    • Cressie E. HolcombeNorman L. DykesMarvin S. Morrow
    • H05B6/80C03C23/00
    • H05B6/80
    • Superior microwave transparent thermal insulations for high temperature microwave sintering operations were prepared. One embodiment of the thermal insulation comprises granules of boron nitride coated with a very thin layer of glassy carbon made by preparing a glassy carbon precursor and blending it with boron nitride powder to form a mixture. The blended mixture is granulated to form a grit which is dried and heated to form the granules of boron nitride coated with a glassy carbon. Alternatively, grains of glassy carbon are coated with boron nitride by blending a mixture of a slurry comprising boron nitride, boric acid binder, and methyl alcohol with glassy carbon grains to form a blended mixture. The blended mixture is dried to form grains of glassy carbon coated with boron nitride. In addition, a physical mixture of boron nitride powder and glassy carbon grains has also been shown to be an excellent thermal insulation material for microwave processing and sintering.
    • 制备了用于高温微波烧结操作的优异的微波透明绝热材料。 绝热的一个实施方案包括用非常薄的玻璃碳层涂覆的氮化硼颗粒,其通过制备玻璃碳前体制备并与氮化硼粉末混合以形成混合物。 将混合的混合物造粒以形成砂粒,将其干燥并加热以形成用玻璃碳涂覆的氮化硼颗粒。 或者,通过将包含氮化硼,硼酸粘合剂和甲醇的浆料的混合物与玻璃碳颗粒混合以形成混合的混合物,用氮化硼涂覆玻璃碳颗粒。 将混合的混合物干燥以形成用氮化硼涂覆的玻璃状碳颗粒。 此外,氮化硼粉末和玻璃碳颗粒的物理混合物也被证明是用于微波加工和烧结的优异的绝热材料。
    • 7. 发明授权
    • Container for heat treating materials in microwave ovens
    • 微波炉热处理材料容器
    • US4810846A
    • 1989-03-07
    • US148530
    • 1988-01-26
    • Cressie E. HolcombeNorman L. DykesHarold D. Kimrey, Jr.James E. Mills
    • Cressie E. HolcombeNorman L. DykesHarold D. Kimrey, Jr.James E. Mills
    • H05B6/64H05B6/80
    • H05B6/64
    • The efficiency of a microwave oven of a conventional two-source configuration and energy level is increased by providing the oven with a container for housing a refractory material to be treated. The container is formed of top and bottom walls transparent to microwaves while the sidewalls, in a circular configuration, are formed of a nonmetallic material opaque to microwave radiation reflecting the radiation penetrating the top and bottom walls radially inwardly into the center of the container wherein a casket of heat-insulating material is provided for housing the material to be heat treated. The reflection of the microwave radiation from the sidewalls increases the concentration of the microwaves upon the material being heat treated while the casket retains the heat to permit the heating of the material to a substantially higher temperature than achieveable in the oven without the container.
    • 通过为烘箱提供用于容纳要处理的耐火材料的容器来增加常规双源配置和能级的微波炉的效率。 容器由对微波透明的顶壁和底壁形成,而圆形构型的侧壁由对微波辐射不透明的非金属材料形成,该非金属材料反射穿过顶壁和底壁径向向内进入容器中心的辐射,其中a 提供隔热材料的棺材来容纳待热处理的材料。 来自侧壁的微波辐射的反射增加了微波在被热处理的材料上的浓度,同时棺材保持热量,以允许材料的加热达到比没有容器的烤箱中实现的温度更高的温度。
    • 8. 发明授权
    • Composition and method for brazing graphite to graphite
    • 石墨对石墨进行钎焊的组成和方法
    • US4432821A
    • 1984-02-21
    • US406829
    • 1982-08-10
    • Albert J. TaylorNorman L. Dykes
    • Albert J. TaylorNorman L. Dykes
    • C04B37/00C04B41/50C03B29/00C04B33/34
    • C04B37/005C04B41/5057C04B2111/00637C04B2237/083C04B2237/363C04B2237/60Y10T428/30Y10T428/31536
    • The present invention is directed to a brazing material for joining graphite structures that can be used at temperatures up to about 2800.degree. C. The brazing material formed of a paste-like composition of hafnium carbide and uranium oxide with a thermosetting resin. The uranium oxide is converted to uranium dicarbide during the brazing operation and then the hafnium carbide and uranium dicarbide form a liquid phase at a temperature about 2600.degree. C. with the uranium diffusing and vaporizing from the joint area as the temperature is increased to about 2800.degree. C. so as to provide a brazed joint consisting essentially of hafnium carbide. This brazing temperature for hafnium carbide is considerably less than the eutectic temperature of hafnium carbide of about 3150.degree. C. The brazing composition also incorporates the thermosetting resin so that during the brazing operation the graphite structures may be temporarily bonded together by thermosetting the resin so that machining of the structures to final dimensions may be completed prior to the completion of the brazing operation. The resulting brazed joint is chemically and thermally compatible with the graphite structures joined thereby and also provides a joint of sufficient integrity so as to at least correspond with the strength and other properties of the graphite.
    • 本发明涉及一种用于接合可在高达约2800℃的温度下使用的石墨结构的钎料。由硬质合金和铀氧化物的糊状组合物与热固性树脂形成的钎料。 在钎焊操作期间,氧化铀转化为二硫化铀,然后在约2600℃的温度下,铪碳氢化合物和二氧化铀形成液相,随着温度升高至约2800℃,铀从接合区域扩散和蒸发 以提供基本上由碳化铪组成的钎焊接头。 该碳化铪的钎焊温度明显低于约3150℃的碳化铪的共晶温度。钎焊组合物还包含热固性树脂,使得在钎焊操作期间,石墨结构可以通过热固化树脂暂时粘接在一起,使得 在完成钎焊操作之前,可以将结构加工成最终尺寸。 所得的钎焊接头与由此接合的石墨结构化学和热相容,并且还提供足够的完整性的接头,以便至少对应于石墨的强度和其它性质。