Metal founding – Process – Shaping a forming surface
Patent
1992-02-12
1993-12-28
Seidel, Richard K.
Metal founding
Process
Shaping a forming surface
164522, B22C 100, B22C 910
Patent
active
052730980
ABSTRACT:
A method for the manufacture of salt cores is described. The cores are used for the production of cavities in articles which have been made by a pressure casting technique. The cores are resistant to impregnation and fracture during, for example, the application of pressure during squeeze casting. In particular, the method comprises mixing coarse and fine particle salt powders in the ratio from 50/50 to 70/30 coarse/fine, the coarse powder having a maximum particle size of 250 micrometers, the fine powder having a maximum particle size of 25 micrometers. A lubricant, for example, oleic acid is added, possibly the quantity thereof being in the range 0. 1 to 1.0 wt %. A surfactant, such as a silane, also may be added, possibly the quantity thereof being in the range 0.1 to 1.0 wt %. The mixture is pressed to form a core having a density of at least 1.90 g/cm.sup.3 ; and is sintered at a temperature between 650.degree. C. and 775.degree. C., for a time in the range 15 minutes to 1 hour.
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Hyndman Christopher P.
Wordsworth Robert A.
AE Piston Products Limited
Puknys Erik R.
Seidel Richard K.
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