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    • 3. 发明授权
    • Core compositions and articles with improved performance for use in castings for gas turbine applications
    • 具有改进性能的核心组合物和制品用于燃气轮机应用的铸件
    • US06345663B1
    • 2002-02-12
    • US09617013
    • 2000-07-14
    • Frederic Joseph KlugRobert Arthur Giddings
    • Frederic Joseph KlugRobert Arthur Giddings
    • B22D904
    • C04B38/0058B22C1/22C04B35/111C04B35/634C04B35/63444C04B35/65C04B2111/00939C04B35/10C04B38/062
    • A method for fabricating a fired ceramic article, a green product, and a fired ceramic article, all for use as a core in the investment casting of directionally solidified eutectic and superalloy material. A ceramic slurry is prepared of alumina, aluminum and a solution of a polymerizable binder in a liquid. The slurry is extruded under low pressure into a closed cavity to form a gelled green product which is subsequently heated in an oxygen-containing atmosphere, wherein the oxygen reacts with the aluminum in the green product to form alumina which advantageously causes an increase in volume of the green product which counters the shrinkage effects of heating. The polymerizable binder is of a type which cross-links with the alumina and upon heating the liquid component of such binder vaporizes and the remaining polymer component subsequently gasifies on further heating to leave desired interstitial pores within the green product, which assist in allowing the oxygen to permeate the green product, which assists in oxidation of the aluminum through the green product. The green product is thereafter sintered to form a substantially dimensionally precise ceramic article suitable for precision-casting of superalloy materials.
    • 一种烧制陶瓷制品,绿色产品和烧制陶瓷制品的制造方法,全部用作定向凝固的共晶和超合金材料的熔模铸造中的核心。 制备氧化铝,铝和可聚合粘合剂在液体中的溶液的陶瓷浆料。 将浆料在低压下挤压成封闭的空腔以形成凝胶状绿色产品,随后在含氧气氛中加热,其中氧气与绿色产品中的铝反应形成氧化铝,这有利地导致体积增加 这是绿色产品,反映了加热的收缩效应。 可聚合粘合剂是与氧化铝交联并且在加热这种粘合剂的液体组分时蒸发的类型,并且剩余的聚合物组分随后在进一步加热下气化以在绿色产品内留下所需的间隙,这有助于允许氧 渗透绿色产品,这有助于通过绿色产品氧化铝。 然后将绿色产品烧结以形成适用于超级合金材料的精密铸造的基本尺寸精确的陶瓷制品。