Metal objects and methods for making metal objects using disposable molds
A technology of metal objects and metal alloys, which is applied in the field of metal objects and used in the manufacture of metal objects using disposable molds, which can solve the problems of cracks, rough surface finish, etc., and achieve the effect of effective cost and rapid adjustment of processing design
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example 1
[0057] Plastic molds for aircraft engine parts are made using 3-D printing techniques such as fused deposition modeling (FDM). The metal powder slurry formulation (Table 1) was introduced into the mold.
[0058] Table 1: Inconel 625 Acrylic Size Recipe
[0059] Element
[0060] The calculated density of the uncured slurry is 6.205 g / cm 3 . The slurry was cured at 55°C for 12 hours under nitrogen. The firmware is in figure 2 shown in (second and fourth parts).
[0061] Cured parts were degreased using the temperature profile and ambient conditions shown in Tables 2 and 3.
[0062] Table 2: Degreasing curve - temperature
[0063] Initial temperature (°C)
[0064] Table 3: Environmental Conditions for Degreasing
[0065] gas
[0066] Total carbon and oxygen contents were determined using Leco CS844(C) and ONH836(O) induction furnace / inert gas fusion instruments with infrared absorption and gas chromatography detectors. Table 4 shows the resu...
example 2
[0079] Silicone molds are made into patterns using LEGO® pieces. Metal powder slurries (Table 1) were introduced into molds to produce green bodies. The green body was cured, degreased and sintered using the conditions described in Example 1. A micrograph showing the grain structure of the metal piece is at image 3 shown in , and photos of the final product at Figure 4 shown in . In particular, it can be seen that the process is able to reproduce very fine details of the molded parts (185.2 μm wide features).
[0080] The roughness of the parts was determined and shown in Table 7.
[0081] Table 7: Surface roughness measurements of metal objects made using silicone molds
[0082] Place
[0083] This example demonstrates that the process described herein is capable of producing fine and equiaxed grain sizes for small, complex geometries.
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Abstract
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