Method for preparing single-crystal high-temperature alloy by combining solid-solution-state columnar crystals with crystal selection
A high-temperature alloy and columnar crystal technology, which is applied in the field of preparation of single-crystal superalloys, can solve the problems of large crystal orientation deviation and low performance of single-crystal turbine blades, and achieve the effect of reducing difficulty and cost
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Embodiment 1
[0036] Preparation of Ni-14Mo-7AL single crystal high temperature alloy bar, its specific steps are:
[0037] The first step is to prepare a part wax mold and a spirally crystal wax mold; after melting the wax at a temperature of 75 ° C, inject the parts mold, and press molding at a pressure of 0.5 MPa, and produce a part wax mold; The spirally crystallizer mold is injected into the spirally selected crystallizer mold at a temperature of 75 ° C, and is pressed into 0.5 MPa pressure, and the spiral-selected crystal wax mold is prepared, and the spiral-free wax mold comprises a spiral section and a lactone section. Two parts;
[0038] In the second step, the part wax mold is welded at one end of the helical section of the spiral selection wax mold; the welded parts wax mold and the spiral crystallizer wax mold are pulpted, and the pulp is subjected to the shining. The surface of the surface layer used is 65 to 100 mesh mixed sand, repeated turning wax mold, so that the sand is evenl...
Embodiment 2
[0043] Preparation of Ni-13.5Mo-7.6Al-0.05B single crystal high temperature alloy bar, its specific steps are:
[0044] The first step is to prepare a part wax mold and a helical cleavage wax mold; the wax material is melted into the parts mold at a temperature of 100 ° C, and is pressed into the part mold in the pressure of 8 MPa, and the parts wax mold is made; wax material After melting at a temperature of 100 ° C, inward injection into the spirally crystallizer mold, and press molded at a pressure of 8 MPa, prepared a spirally crystallizer wax mold, and the spiral selection of the wax mold including the spiral segment and the lactone section. ;
[0045] In the second step, the welded parts wax mold and the helix-free wax mold are pulpted. After the slurry, the slurry is shaked, the surface layer sand is 65 ~ 100 mesh, and the wax is repeatedly rotated. The mold is evenly distributed on the surface of the wax mold; the surface is floating, and the drying chamber is placed in ...
Embodiment 3
[0050] Preparation of Ni-12Mo-7.2Al-0.02B single crystal high temperature alloy plate, its specific steps are:
[0051] The first step is to prepare a part wax mold and a helical cleavage wax mold; the wax material is melted into the parts mold at a temperature of 120 ° C, and is pressed into the part mold in the pressure of 5 MPa, and the parts wax mold is made; wax material After melting at 120 ° C, the spirally selected crystal mold is injected, and the mold is pressed under the pressure of 5 MPa, and the spiral-selected crystal wax mold is obtained, and the helix-free wax mold includes a spiral segment and a lactone section. ;
[0052] In the second step, the part wax mold is welded to the spiral section of the spiral selection wax mold; 7 mm ceramic refractory slurry is applied to the outside of the part wax mold and the spirally crystallizer wax mold, and then at 150 ° C temperature Death waxing, after 3 hours at 800 ° C for 3 hours, the ceramic shell is obtained, correspond...
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