首页>
外国专利>
Ceramic cores for casting superalloys and refractory metal composites, and related processes
Ceramic cores for casting superalloys and refractory metal composites, and related processes
展开▼
机译:用于铸造高温合金和难熔金属复合材料的陶瓷芯及相关工艺
展开▼
页面导航
摘要
著录项
相似文献
摘要
A rare earth-based core for use in the casting of a reactive metal is described. The core contains a ceramic composition which includes at least about 10% by weight of monoclinic rare earth aluminate (RE4Al2O9), wherein RE represents at least one rare earth element; and at least about 10% by weight of at least one free rare earth oxide. The ceramic phase of the composition may include a microstructure which comprises a multitude of substantially spherical pores which are formed as a result of the removal of aluminum metal from the core composition during a heat treatment step. Additional embodiments relate to a method for the fabrication of a ceramic core, employing a rare earth oxide, aluminum metal, and a binder. Methods for removing cores from a cast part are also described.
展开▼
机译:描述了用于铸造反应性金属的稀土基芯。芯部包含陶瓷组合物,该陶瓷组合物包含按重量计至少约10%的单斜晶稀土铝酸盐(RE 4 Sub> Al 2 Sub> O 9 Sub>),其中RE表示至少一种稀土元素;至少约10重量%的至少一种游离稀土氧化物。组合物的陶瓷相可以包括微观结构,该微观结构包括大量基本球形的孔,这些孔是由于在热处理步骤中从芯组合物中除去铝金属而形成的。另外的实施方式涉及一种采用稀土氧化物,铝金属和粘合剂的陶瓷芯的制造方法。还描述了从铸件去除芯的方法。
展开▼