Method for integrally casting and molding single crystal part based on gel-casting with seed crystal block embedded structure spiral crystal selector

Abstract

The invention discloses a method for integrally casting and molding a single crystal part based on the gel-casting with a seed crystal block embedded structure spiral crystal selector, and belongs tothe field of rapid casting based on photocuring molding technology. The method comprises the following steps that 1) the single crystal part and an integrated resin mold prototype with the seed crystal block embedded structure spiral crystal selector are manufactured through CAD design by using photo-curing rapid prototyping technology; (2) firstly, ceramic slurry is poured into the integrated resin mold prototype by adopting a gel-casting method, and then vacuum freeze drying and high-temperature sintering strengthening are adopted to obtain the integrated casting mold; and (3) after a seed crystal block is embedded, a directional solidification technology is adopted to realize high-quality molding of the single crystal part. According to the method, the epitaxial growth of the seed crystal block and the crystal selection effect of the spiral crystal selector are utilized, the primary dendrite orientation and the secondary dendrite orientation of the single crystal part are preciselycontrolled, meanwhile, an anti-hybrid crystal structure is arranged to improve the performance and quality of the single crystal part. According to the method, the design is reasonable, the manufacturing cycle of the single crystal part is greatly shortened, and the reliability of part manufacturing is improved.

Description

technical field [0001] The invention belongs to the field of rapid casting based on light-curing molding technology, and relates to a method for forming single crystal parts based on a gel injection molding integrated casting mold with a spiral crystal selector with a seed crystal block embedded structure. Background technique [0002] Single crystal superalloys are widely used in hot-end components of aero-engines and industrial gas turbines, such as single-crystal turbine blades, due to their good high-temperature mechanical properties. When the primary dendrite orientation of the crystal is consistent with the principal stress direction of the blade, it has the best thermal fatigue performance, and the secondary dendrite orientation of the crystal also has a significant impact on the performance of the blade. Therefore, it is hoped that in the process of preparing single crystal superalloy Ability to control primary and secondary dendrite orientation. The manufacturing m...

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Problems solved by technology

[0004] In order to overcome the above-mentioned shortcoming of the prior art, the object of the present invention is to provide a kind of method based on the gel injection molding integrated casting molding single crystal parts with the spiral crystal selector with embedded structure of the seed crystal block, this method solves the problem of traditional When the spiral crystal selection method or seed crystal method is used to manufacture single crystal parts, the controllability of the secondary dendrite orientation is poor, and there are problems of miscellaneous crystals, which improves the performance and quality of single crystal parts and shortens the manufacturing cycle.

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