Filler material and wax composition for use in investment casting
AssigneeThe Kindt-Collins Company
InventorPaul A. Guinn
Life of this patent
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Abstract
A wax composition for use in investment casting having improved properties includes polyethylene terephthalate as a filler material. The amount of polyethylene terephthalate used in the wax composition ranges from about 5 to about 50 parts by weight of the total wax composition. The use of polyethylene terephthalate as the filler material is effective for controlling the expansion and contraction properties of the wax composition providing a high degree of dimensional accuracy. Polyethylene terephthalate is relatively inexpensive compared to other inert filler materials, does not react with the mold, allows the wax pattern to be readily removed from the mold with reduced tendencies for shell cracking and results in little or no appreciable ash residue upon firing.
Claims19
In an investment casting wax composition for use in an investment casting process, the improvement wherein particles of polyethylene terephthalate are present in the wax composition as a filler material, wherein at least about 50% of said polyethylene terephthalate particles have a diameter not greater than 150 microns.
A wax composition for use in investment casting comprising polyethylene terephthalate wherein at least about 50% of said polyethylene terephthalate particles have a diameter not greater than 150 microns and are present in an amount ranging from about 5 to about 50 parts by weight of the total wax composition and waxes in an amount ranging from about 50 to about 95 parts by weight of the total wax composition.
In a method of investment casting comprising forming in a die a wax pattern comprising a wax composition and then investing said wax pattern to form a cast, the improvement comprising suspending a filler material in the wax composition wherein said filler material comprises polyethylene terephthalate.
A method for investment casting comprising:
- injecting into a mold a wax composition to form a solid pattern, said wax composition comprising polyethylene terephthalate in an amount ranging from about 5 to about 50 parts by weight and wax in an amount ranging from about 50 to about 95 parts by weight of the total wax composition;
- and
- investing said pattern to form a cast.
In an investment casting wax composition for use in an investment casting process, the improvement wherein particles of polyethylene terephthalate are present in the wax composition as a filler material in an amount ranging from greater than 10 to about 50 parts by weight of the total wax composition.
Dependencies are inferred from the claim text.