Casting centrifugal pressure applied to force the

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Unformatted text preview: ing - centrifugal pressure applied to force the liquid metal - chill molds types: - true centrifugal - semi centrifugal - centrifuged Methods: - Watertown method - Sand spun method - DeLavaud Method Benefit: - slag-metal separation - Rapid solidification processing Synthesis of Bulk Metallic Glasses cooling rate 106 K/s Ar atmosphere after evacuation Methods gas atomization/ spray atomization melt spinning splat quenching Ar gas pressure melt spinning Induction coil Quartz nozzle Benefit - metastable alloys/ non-equilibrium phases - the extension of solid solubility - reduction in the grain size - reduction of number and size of segregation - formation of amorphous structure (metallicFIGURE 4.1 glasses) Melt-spun ribbon Direction Cu roll Schematic illustration of the melt-spinning process. Products powder, foil, ribbon Melt spinners are available commercially from Marco Materials in States, and Nisshin Giken Corporation and Makabe Corporation in In the melt-spinning method, a small quantity of the alloy is m a crucible or by levitation methods, and then ejected by pre through a ne nozzle onto a fast-rotating copper wheel. Every o parameters can be carefully controlled to obtain the desired size, thickness of the ribbon. The crucible material is chosen based on its chemical compat the melt, its temperature handling capability, its resistance to ther its low thermal conductivity, and its low porosity. Dense alumina ium Silicate Gloss man Inuryunic Binder in Foundry Industry Binders and binding action organic / inorganic binder rrous metals and iron . Important advantages of se moulds are the high rates of cooling and the Clay-water system an casting surfaces . Temporary moulds consist of e - Electrochemical binder system and some basic materials, a bonding, interlayer penetration- concept of rigid water ditives. - Surface tension, mechanical interlocking The basic materials are granular substances of shed, classified and dried different silica sands. E basic materials - investment may be esethyl-silicate (moulding sands)molding/ ssified into four different types as follows: casting Natural moulding sand High silica sand linsed oil - core making Special sand such as zircon, olivine, chamotte, chromite, chrome-magnesite, corundum, magnesite, Sodium mullite. sillimanite andsi...
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This note was uploaded on 10/11/2012 for the course MINING 101 taught by Professor K.dey during the Spring '11 term at Indian Institute of Technology, Kharagpur.

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