Method for manufacturing surface compact internal loose ceramic core for precision casting of hollow turbine blade

Abstract

The invention relates to a method for manufacturing the surface compact internal loose ceramic core for precision casting of the hollow turbine blade, and effectively solves the problems of insufficient deformability and difficulty in core removal of the ceramic core. The method comprises the following steps of 1, preparing a resin mold, specifically, manufacturing a core resin mold by adopting aphotocuring rapid molding method; 2, preparing a ceramic slurry, specifically, preparing the ceramic slurry for gel injection molding; 3, manufacturing a ceramic core, specifically, pouring the ceramic slurry into a ceramic core resin mold; 4, carrying out first dipping treatment, specifically, carrying out impregnation treatment on the pre-sintered degreased ceramic core by adopting a low-concentration silica sol; and 5, carrying out secondary impregnation treatment, specifically, carrying out dipping treatment on the core by adopting a high-concentration silica sol. According to the method,a ceramic core blank is manufactured on the basis of a photo-curing rapid molding technology and a gel injection molding technology, silica sol with different concentrations is impregnated twice, thedipping depth of the silica sol is controlled, and therefore the preparation of the aluminum oxide-based ceramic core with dense surface layer and central porous is realized.

Description

technical field [0001] The invention relates to the technical field of precision casting of hollow turbine blades, in particular to a method for manufacturing a ceramic core with dense surface layer and loose interior used for precision casting of hollow turbine blades. Background technique [0002] Hollow turbine blades are one of the core components of aero-engines and industrial gas turbines, which contain complex cooling channel structures. Currently, the blades are mainly shaped by the precision casting method. In order to form the cooling channel structure inside the blade by precision casting, it is necessary to prepare the ceramic core first. Alumina-based ceramic cores have excellent chemical stability in high-temperature environments, and are not easy to chemically react with molten metal, so they are widely used. [0003] However, during the blade casting process, the molten metal will shrink when it solidifies, and the metal blade will also shrink during the co...

AI Technical Summary

Problems solved by technology

[0015] The purpose of the present invention is to address the deficiencies of the prior art, and to provide a method for manufacturing an alumina-based ceramic core with a dense surface and a loose center, which is based on light-curing rapid prototyping technology and gel injection molding technology to manufacture ceramic core blanks body, and then impregnate different concentrations of silica sol twice, and control the impregnation depth of silica sol, so as to realize the manufacture of alumina-based ceramic core with dense surface and porous center, and solve the problem of insufficient yield of ceramic core and difficulty in core removal question

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