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    • 2. 发明授权
    • Cores for investment casting process
    • 投资铸造工艺的核心
    • US4093017A
    • 1978-06-06
    • US644939
    • 1975-12-29
    • John J. Miller, Jr.Donald L. EppinkTed A. Loxley
    • John J. Miller, Jr.Donald L. EppinkTed A. Loxley
    • C04B35/14B22C1/00B22C1/08B22C9/04C04B35/16B22C1/02B22C9/10B22C9/12
    • B22C1/00B22C9/04B22C9/10B22D27/045B22D27/15B22D29/002
    • A porous high-silica core is disclosed for use in directional solidification casting processes having exceptional thermal stability at temperatures above 1650.degree. C. and containing mineralizers which promote the formation of cristobalite. The cores may be made by mixing at least 75 parts of essentially pure fused silica particles with 1 to 25 parts of activating particles containing a mineralizer, such as an alkali metal or alkaline earth metal compound, may be fired at a temperature of 1000.degree. to 1300.degree. C. until they contain 35 percent or more of cristobalite and may then be cooled to room temperature. They may thereafter be incorporated in a shell mold in accordance with the "lost-wax" process and preheated with the shell mold at a temperature of 1300.degree. to 1600.degree. C. to provide a cristobalite content of 60 to 85 percent or more within a short period of time, such as 10 to 30 minutes, and before a molten superalloy is allowed to flow into the mold. The core has exceptionally high thermal stability and may be maintained at a temperature of 1550.degree. to 1600.degree. C. or higher for one hour or more during the directional solidification process without substantial deformation. The high ultimate use temperature of the core makes it possible to produce better castings by carrying out the D.S. process at a temperature 50.degree. to 100.degree. centigrade higher than previously used.
    • 公开了一种用于定向凝固铸造工艺的多孔高二氧化硅芯,其在高于1650℃的温度下具有优异的热稳定性,并且含有促进方英石形成的矿化剂。 芯可以通过将至少75份基本上纯的熔融二氧化硅颗粒与1至25份含有矿化剂如碱金属或碱土金属化合物的活化颗粒混合来制备,可以在1000℃至 1300℃,直到它们含有35%或更多的方英石,然后可以冷却至室温。 然后根据“失蜡”方法将它们并入壳模中,并在1300℃至1600℃的温度下用壳模预热,以提供在85℃以内的方晶石含量为60-85% 短时间,如10至30分钟,并且在熔融的高温合金流入模具之前。 该芯具有非常高的热稳定性,并且在定向凝固过程中可以在1550℃至1600℃或更高的温度下保持1小时或更长时间,而不会发生实质变形。 芯的最高使用温度可以通过在比以前使用的温度高50至100℃的温度下进行D.S.工艺来生产更好的铸件。