A method and equipment capable of improving the efficiency of ceramic core removal

Abstract

The invention discloses a method and device capable of improving ceramic core removal efficiency. Firstly, according to the method, alkali liquor is used as core removal liquid, and clear water is used as a medium for regularly removing core removal products. The device adopting the method comprises an alkali liquor cavity, a clear water cavity, a reaction cavity and a pressure bearing cavity. During work, the alkali liquor is sucked back to the alkali liquor cavity through a vacuum air pump after being injected in the reaction cavity to react for a period of time, then, clear water is injected in the reaction cavity and violently boils at the moment, the core removal products attached to the surface of a core are removed through the boiling flushing force, then, the clear water is sucked back to the clear water cavity, the alkali liquor is injected to the reaction cavity again, and the steps are repeatedly executed till the core is completely removed. According to the type of device, pressure inside a system is kept constant through a pressure stabilization air pump. Because no pressure difference exits between the interior and the exterior of the reaction cavity, the wall thickness is decreased, and safety is improved. Because the core removal products on the surface of the core can be flushed away by injecting the clear water periodically, the core removal speed is substantially increased, and the method and the device can be used for removing the ceramic core of any complex structure.

Description

technical field [0001] The invention belongs to the technical field of rapid removal of hollow turbine blade ceramic cores, and in particular relates to a method and equipment capable of improving the efficiency of ceramic core removal, and is suitable for hollow turbine blade alumina-based ceramic cores with complex inner cavity structures. Removes quickly. Background technique [0002] Modern aero-engines and gas turbines all use hollow turbine blades. The operating temperature of the turbine blades is extremely high, and the internal cooling channels must be optimized to meet the operating temperature requirements. Therefore, the cooling channels inside the hollow turbine blades are becoming more and more complex. In order to shape the complex structure cooling channel inside the blade, it is necessary to manufacture and use a ceramic core with a corresponding complex structure. At present, ceramic core materials are mainly alumina and silica. Compared with silica-based ...

AI Technical Summary

Problems solved by technology

However, due to the high chemical stability of alumina, the core removal rate is slow under normal pressure alkali boiling conditions

High temperature and high pressure core removal is an effective method to increase the core removal rate, but under high temperature and high pressure, the core removal reaction products often adhere to the core surface and hinder the further progress of the core removal reaction

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