A shell and method for preparing large-scale nickel-based single crystal superalloy rods
A nickel-based single crystal and high-temperature alloy technology, applied in chemical instruments and methods, single crystal growth, single crystal growth, etc., can solve the problems of low yield and many miscellaneous crystals, and avoid miscellaneous crystal defects. The method is simple and effective Effect
Active Publication Date: 2019-06-18
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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Problems solved by technology
[0003] In order to solve the problems of many miscellaneous crystals and low yield in the preparation of large-size single-crystal alloy parts, the present invention provides a shell and method for preparing large-size nickel-based single-crystal superalloy rods. Cooperate with the appropriate process to obtain single crystal rods with diameters ranging from 30mm to 50mm and lengths ranging from 100mm to 200mm. At the same time, the formation of miscellaneous crystals can be effectively avoided, and the yield rate is significantly improved.
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Embodiment 1
[0022] Alumina (Al 2 o 3 ) as the material to prepare the composite ceramic shell, wherein: the Al of the surface layer of the shell 2 o 3 The purity is 95%, the particle size is 300 mesh; the Al 2 o 3 The purity is 99%, and the particle size is 20-40 mesh. The shell includes a starting end 4, a spiral section 3 and a rod section 1, and the spiral section 3 and the rod section 1 are connected by a tapered transition section (the spiral section 3 is connected with the thin end of the tapered transition section 2, The rod section 1 is connected to the thick end of the tapered transition section 2, and the starting end 4 is connected to the helical section 3), by controlling the distance between the rod section 1 and the helical section 3, the tapered transition between the two is ensured The cone angle θ of section 2 is not greater than 45°, such as figure 1 shown. The optimal height of the starting end is 10mm and the diameter is 8mm. The optimum height of the spiral se...
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Abstract
The invention discloses a shell and a method for producing large-size nickel-based monocrystalline high temperature alloy bars, and belongs to the technical field of high temperature alloy production. The method adopts a Al2O3 ceramic shell with a specific structure, and the cone angle of a transition segment between a spiral segment and a bar segment is not greater than 45DEG. Monocrystalline alloy melting and production are carried out in an industrial directional solidification device, the withdrawal rate of an initial end is 6mm / min, the withdrawal rate of the spiral segment is 6mm / min, and the withdrawal rate of the bar segment is 2mm / min. The problem of formation of stray crystals in the large-size bar monocrystalline high temperature alloy produced through traditional casting methods is solved, and the monocrystalline bars with the diameter of 30-50mm and the length of 100-200mm are successfully produced. Formation of solidified stray crystals is effectively avoided. The method is simple and effective, and is suitable for producing large-size monocrystalline high temperature alloy cylindrical parts.
Description
Technical field: [0001] The invention relates to the technical field of single crystal superalloy preparation, in particular to a shell and method for preparing large-sized nickel-based single crystal superalloy rods. The method is simple and effective, and is suitable for preparing large-scale single crystal superalloy cylindrical parts. Background technique: [0002] As we all know, single crystal superalloys have significantly improved high temperature performance compared with ordinary equiaxed crystal alloys due to the elimination of grain boundaries and grain boundary strengthening elements. Therefore, the development of nickel-based single crystal superalloys has also become a hot spot in the field of modern material research. Usually single crystal superalloys are prepared by directional solidification, but in the actual production process, due to the unreasonable directional solidification process technology, single crystal parts often lead to miscellaneous crystals...
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IPC IPC(8): C30B11/00C30B29/52
CPCC30B11/001C30B29/52
Inventor 刘纪德周亦胄李金国孟祥斌赵乃仁金涛孙晓峰
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI