Preparation method for precision casting of mold shell through directional solidification investment casting of titanium-aluminum based alloy
An investment precision casting and directional solidification technology, which is applied in casting molding equipment, metal processing equipment, casting molds, etc., can solve the problems of deteriorating casting quality and affecting the mechanical properties of castings, and achieve long-term preservation, stable size, and stable performance Effect
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[0031] Example 1
[0032] The implementation steps of the preparation method of the titanium-aluminum-based alloy directional solidification investment casting mold shell are as follows:
[0033] ⑴Isolation layer slurry preparation
[0034] Mix titanium boride powder with a powder particle size of 200 mesh with yttrium sol, stir evenly, and set aside, the weight ratio of the powder to yttrium sol is 3:1, and the flow cup viscosity of the isolation layer slurry is 98s;
[0035] ⑵ Preparation of back layer slurry
[0036] Mix 200 mesh zirconia powder and zirconia sol at a weight ratio of 2:1, stir evenly, and set aside. The flow cup viscosity of the back layer slurry is 78s;
[0037] ⑶ Mold shell isolation layer preparation
[0038] Spread the prepared isolation layer slurry on a wax mold, and then evenly spread the powder with 30 mesh yttrium oxide sand, dry it for 12 hours at 20°C and 30% humidity, and repeat the above-mentioned coating and spreading. Sprinkle and dry 4 times to form a h...
Example Embodiment
[0043] Example 2
[0044] The implementation steps of the preparation method of the titanium-aluminum-based alloy directional solidification investment casting mold shell are as follows:
[0045] ⑴Isolation layer slurry preparation
[0046] Mix the titanium boride powder with a powder particle size of 325 mesh with yttrium sol, stir evenly, and set aside, the weight ratio of the powder to yttrium sol is 5:1, and the flow cup viscosity of the isolation layer slurry is 55s;
[0047] ⑵ Preparation of back layer slurry
[0048] Mix the zirconium oxide powder with a particle size of 325 mesh and zirconium sol in a weight ratio of 4:1, stir evenly, and set aside. The flow cup viscosity of the back layer slurry is 42s;
[0049] (3) Preparation of mold shell isolation layer
[0050] Spread the prepared isolation layer slurry on a wax mold, and then evenly spread the powder with 100 mesh yttrium oxide sand, dry it for 20 hours at 23°C and 60% humidity, and repeat the above coating and spreading. ...
Example Embodiment
[0055] Example 3
[0056] The implementation steps of the preparation method of the titanium-aluminum-based alloy directional solidification investment casting mold shell are as follows:
[0057] ⑴Isolation layer slurry preparation
[0058] Mix titanium boride powder with a powder particle size of 500 mesh with yttrium sol, stir evenly, and set aside. The weight ratio of the powder to yttrium sol is 8:1, and the flow cup viscosity of the isolation layer slurry is 34s;
[0059] ⑵ Preparation of back layer slurry
[0060] Mix the zirconia powder with a particle size of 500 mesh and the zirconia sol at a weight ratio of 6:1, stir evenly, and set aside. The flow cup viscosity of the back layer slurry is 23s;
[0061] ⑶ Mold shell isolation layer preparation
[0062] Spread the prepared isolation layer slurry on a wax mold, and then evenly spread the yttrium oxide sand with a particle size of 150 mesh, and dry it for 36 hours at 25°C and a humidity of 90%. Repeat the above coating and spreadin...
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