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Investment casting mold and method of manufacture

A shell mold and model technology is applied in the field of improved investment casting to achieve the effect of increasing stability

Inactive Publication Date: 2001-04-04
BUNTROCK IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0038] Although these methods of the art change the degree of efficiency in preparing ceramic shell molds for use in PICs, they still require multiple catalytic steps or considerable time intervals between successive coatings of refractory slurry materials

Method used

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  • Investment casting mold and method of manufacture
  • Investment casting mold and method of manufacture

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0072] The wax strip model 1 of 8 inches×7 / 8 inches×3 / 8 inches as shown in FIG. For convenience, the same refractory mortar was used for both the bottom layer and the reinforcement layer.

[0073] Table 1

[0074] Material Dosage Megasol TM1 1000g Tecosil 120F 2 1500gZircon 325 3 400gPS 9400 Surfactant 4 2ml

[0075] 1. Megasol TM Colloidal silica sol binder with 50% solids was purchased from Wesbond Corp. Buy.

[0076] 2. Fused silica commercially available from C-E Minerals, particle size 44-177 microns.

[0077] 3. Calcined Florida zircon was purchased from Continental Materials with a particle size of -325 mesh.

[0078] 4. A nonionic surfactant commercially available from Buntrock Industries, Williamsbug, VA, PS 9400 is a polyethyldecanol having a specific gravity of about 0.1.

[0079] The wax model 1 was dipped in the refractory mud for 5 seconds, removed, and drained for 10 seconds to for...

example 12

[0099] The procedure of Example 10 was followed except that NYACOL 830 was diluted with water to provide a colloidal silica solids content of 24%. MOR was measured as in Example 1.

example 13

[0102] Except for Ludox with an average particle size of 14 nm and a colloidal silica solids content of 35% _ HS40 colloidal silica sol instead of Megasol with 50% solids content TM Other than that, proceed as in Example 1. Ludox _ HS 40 is available from E. I. Dupont de Nemours, Inc. Buy. The green and fired MORs were measured as in Example 1.

[0103] example

[0104] 1. After firing the shell at 1800°F for 1 hour, the resulting post-firing modulus of rupture.

[0105] *Total bake dry time for 5 reinforcement layers was 141 minutes.

[0106] **Total bake dry time for 5 reinforcement layers is 236 minutes.

[0107] example

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Abstract

A process for rapidly forming a ceramic shell mold on an expendable pattern (1) is disclosed. The process entails use of refractory slurries which include a large particle size colloidal silica sol binder. The colloidal silica sol binder has an average particle size of about 40 nanometers, i.e., about 3-4 times larger than colloidal silica sol binders heretofore employed in manufacture of ceramic shell molds. The use of the large particle sols yields unfired ceramic shell molds (20) which have about 40% to about 70% greater unfired strengths compared to ceramic shells made with prior art small particle size silica sols. Prime coats and refractory back-up coats which use the large particle size sol dry about 30% to about 40% faster than prime coats and back-up coats which employ the smaller particle size silica sols of the prior art.

Description

technical field [0001] The present invention relates to improved processes and compositions for investment casting. Background technique [0002] Investment casting using wax patterns can be traced back to ancient Egypt and China. However, as currently practiced, it was a relatively new process until the 1930s and represented a rapidly growing business and science. Investment casting technology simplifies the production of complex metal shapes by casting molten metal into a non-reusable ceramic shell mold formed around a disposable wax pattern that matches the desired metal shape exactly the same. "Precision Investment Casting", or PIC, is the technical term that refers to this process. [0003] The conventional PIC method applies six main steps: [0004] (1) Model preparation [0005] The male mold of the desired metal casting for one application is made of a thermoplastic material such as wax which will melt, evaporate or burn completely so as no...

Claims

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Application Information

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IPC IPC(8): B22C1/08B22C1/00B22C1/16B22C1/18B22C9/04
CPCC04B2235/3418B22C1/00C04B2235/3201C04B35/6263C04B2235/6028B22C1/165C04B2235/3427C04B2235/5454C04B35/6316C04B35/14C04B35/638C04B35/632C04B2235/96C04B2235/61C04B2235/3248C04B35/62665C04B2235/5427B22C1/183C04B2235/5436B82Y30/00B22C1/18
Inventor 约翰·范德米尔
Owner BUNTROCK IND INC
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