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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: 2005-03-02
BUNTROCK IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0042] 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
  • Investment casting mold and method of manufacture

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0082] The wax strip model 1 of 8 inches x 7 / 8 inches x 3 / 8 inches as shown in FIG. 1 was immersed in the refractory mud. For convenience, the same refractory mortar was used for both the bottom layer and the reinforcement layer.

[0083] Table 1

[0084] Material Amount

[0085] Megasol TM1 1000g

[0086] Tecosil 120F 2 1500g

[0087] Zircon 325 3 400g

[0088] PS 9400 Surfactant 4 2ml

[0089] 1. Megasol TM The colloidal silica sol adhesive was 50% solids and was purchased from Wesbond Corp.

[0090] 2. Fused silica available from C-E Minerals, particle size 44-177 microns.

[0091] 3. Calcined Florida zircon purchased from Continental Materials, particle size -325 mesh.

[0092] 4. A nonionic surfactant purchased from Buntrock Industries, Williamsbug, VA, PS 9400 is a polyethylated decanol having a specific gravity of about 0.1.

[0093] The wax model 1 was dipped in the refracto...

example 2

[0106] Except Megasol TM Diluted with water, except that the colloidal silicon oxide solid content is 45%, the rest are carried out by the operation of example 1. MOR was measured as in Example 1.

example 3

[0108] Except Megasol TM Diluted with water, except that the colloidal silicon oxide solid content is 40%, all the others are carried out by the operation of example 1. MOR was measured as in Example 1.

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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 not to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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