초록 ▼

A reinforced tubular core for casting gas turbine engine blades with cooling air passages therein is disclosed. A method of casting is also disclosed in which the blades are directionally solidified to produce columnar grained or single crystal blades and in which non-linear passages can be produced

A reinforced tubular core for casting gas turbine engine blades with cooling air passages therein is disclosed. A method of casting is also disclosed in which the blades are directionally solidified to produce columnar grained or single crystal blades and in which non-linear passages can be produced. The problem in producing such articles is that the moulds and cores used in the casting process are held at temperatures in excess of 1500°for long periods and presently used silica cores deform during the process. Stronger cores of alumina or silicon nitride cannot be easily bent were believed to be non-leachable from the casting. The present invention provides a core having a tubular silica sheath with a solid alumina rod inside it for support. The sheath can be bent and the straight alumina rods can be inserted from opposite ends of the sheath.

대표청구항 ▼

A method of casting a nickel- or cobalt-based superalloy component comprising the steps of: (a) making a mold having a casting cavity in the shape of the component to be cast; (b) locating a core within said casting cavity, said core comprising: (i) a hollow member, said hollow member comprising two

A method of casting a nickel- or cobalt-based superalloy component comprising the steps of: (a) making a mold having a casting cavity in the shape of the component to be cast; (b) locating a core within said casting cavity, said core comprising: (i) a hollow member, said hollow member comprising two straight leachable ceramic refractory material portions interconnected by a bend; and, (ii) a ceramic support member, said ceramic support member comprising material of greater refractoriness than said material of said hollow member, wherein said support member comprises two straight portions extending into said hollow member from opposite ends thereof and terminating adjacent said bend, and wherein said hollow member has a larger inside diameter than the diameter of said support member at the operating temperature of the core; (c) filling the mold with molten superalloy component material and allowing the superalloy component material to solidify; and, (d) removing the core from the component by withdrawing said support member portions from opposite ends of said hollow member and subsequently leaching said hollow member from the component. A mold for casting nickel- or cobalt-based superalloy, said mold comprising a core for defining a passage in a nickel- or cobalt-based superalloy casting component, said core comprising: (a) a hollow member, said hollow member comprising leachable ceramic refractory material, wherein said hollow member comprises two straight portions interconnected by a bend; and, (b) a ceramic support member, said ceramic support member comprising material of greater refractoriness than said material of said hollow member, wherein said ceramic support member comprises two straight portions extending into opposite ends of said hollow member and terminating adjacent said bend; and wherein said hollow member has a larger inside diameter than the diameter of said support member at the operating temperature of the core.