摘要:
A method of manufacturing a component includes additively manufacturing a crucible; directionally solidifying a metal material within the crucible; and removing the crucible to reveal the component. A component for a gas turbine engine includes a directionally solidified metal material component, the directionally solidified metal material component having been additively manufactured of a metal material concurrently with a core, the metal material having been remelted and directionally solidified.
摘要:
A method of assembling a centrifugal casting apparatus includes positioning a wedge on a rotatable axis and positioning at least two molds into sealing engagement with the wedge. Each of the at least two molds includes a front face and defines at least two cavities extending from the front face into the mold. A sprue chamber is defined and is structured to receive molten material, and at least a portion of the sprue chamber is defined by at least a portion of the front faces of the at least two molds.
摘要:
A directional solidification apparatus includes a mold heating chamber, a solidification chamber, and a gas source. The solidification chamber is adjacent the mold heating chamber for solidifying molten metal formed from an air melt allow system as a cast body as the metal is withdrawn from the mold heating chamber. The gas source is in fluid communication with the mold heating chamber for providing a pressurized atmosphere for directionally solidifying metal as a cast body having single crystal or multi-crystal columnar micro structure.
摘要:
An example system for fabricating an infiltrated downhole tool includes a mold assembly having one or more component parts and defining an infiltration chamber to receive and contain matrix reinforcement materials and a binder material used to form the infiltrated downhole tool. One or more thermal conduits are positioned within the one or more component parts for circulating a thermal fluid through at least one of the one or more component parts and thereby placing the thermal fluid in thermal communication with the infiltration chamber.
摘要:
Various embodiments provide an apparatus and methods for containing the molten materials within a melt zone during melting. The apparatus may include a vessel configured to receive a material for melting therein and an induction coil with unevenly spaced turns along its length. Induction coil can have a series of turns acting as a first (e.g., load) induction coil and a series of turns acting as a second (e.g., containment) induction coil. The material in the vessel can be heated and contained by the separated turns of the induction coil. A plunger can also assist in containing material during melting. Once the desired temperature is achieved and maintained for the molten material, operation of the induction coil can be stopped and the molten material can be ejected from the vessel into a mold using the plunger.
摘要:
Various enhanced features are provided for centrifugal casting apparatuses, rotatable assemblies, and molds for casting products from molten material. These enhanced features include, among others, tapered gate portions positioned adjacent to the cavities of a mold, extended and shared gating systems, and detachable mold structures for modifying the thermodynamic characteristics and behavior of molds during casting operations.
摘要:
The invention relates to a method for demoulding a casting from a casting mould having at least one casting core which images a passage opening in the casting connecting two outer sides of the casting and is produced from a moulding material bound by a binder which decomposes under the influence of temperature, wherein the casting mould undergoes a heat treatment in a furnace for the demoulding, during which it is heated to a temperature at which the binder loses its binding effect.In the furnace, hot gas is flowed through a passage formed in the casting core of the casting mould the temperature of the hot gas corresponding at least to the temperature at which the binder of the moulding material loses it binding effect such that the casting core decomposes into fragments or separate sand particles as a consequence of the influence of the hot gas.
摘要:
An article and a method for forming a single crystal casting are disclosed. The article includes a single crystal nickel-based superalloy having a composition including greater than about 80 ppm boron (B) and a substantially single crystal microstructure with at least one grain boundary. A creep rupture strength of the article is substantially maintained up to a mismatched grain boundary of about 40 degrees. The method for forming a single crystal casting includes positioning a mold on a cooling plate, the mold including a single crystal selector, providing a molten nickel-based superalloy composition in the mold, the molten composition including greater than about 80 ppm boron (B), cooling the molten composition with the cooling plate, and forming a unidirectional temperature gradient by withdrawing the mold from within a heat source to form the single crystal casting including a substantially single crystal microstructure having at least one grain boundary.
摘要:
Various embodiments provide an apparatus and methods for containing the molten materials within a melt zone during melting. The apparatus may include a vessel configured to receive a material for melting therein and an induction coil with unevenly spaced turns along its length. Induction coil can have a series of turns acting as a first (e.g., load) induction coil and a series of turns acting as a second (e.g., containment) induction coil. The material in the vessel can be heated and contained by the separated turns of the induction coil. A plunger can also assist in containing material during melting. Once the desired temperature is achieved and maintained for the molten material, operation of the induction coil can be stopped and the molten material can be ejected from the vessel into a mold using the plunger.
摘要:
A casting component comprising essentially no macro porosity by having the casting material fill the mold cavity with a laminar flow is disclosed. In one embodiment, the gas within the mold cavity will not be entrained when the flow is laminar. Control of this flow behavior is directly related to the microstructure and thixotropy of the alloy. The SLC slurry have a thixotropic nature and a non-turbulent way of flowing into a casting die, allowing the process to be capable of producing cast parts having thin sections, geometric complexity and close dimensional tolerances without entrapped gas porosity. The thixotropic aluminum slurry may be characterized by a uniform primary aluminum particle size in the range of 50 to 80 microns. A uniform distribution of this microstructure throughout the injected aluminum volume encourages laminar flow of the aluminum into the die cavity.