Preparation method of water-soluble ceramic core

Abstract

The invention discloses a preparation method of a water-soluble ceramic core.The water-soluble ceramic core is prepared from, by mass, 20-60% of sodium chloride powder, 40-80% of zircon powder, ethyl silicate, 15-20% of plasticizer, 30% of baking soda and 10% of talcum powder, wherein the total weight parts of the sodium chloride powder and the zircon powder sum up to 100%, ethyl silicate accounts for 0.5-1% of the total weight parts of the sodium chloride powder and the zircon powder, and the plasticizer is polyethylene glycol with the concentration being 50%.The preparation method of the water-soluble ceramic core comprises the steps of powder preparation and mixing, slurry preparation, compression formation, dewaxing and sintering.The core prepared through the preparation method is high in wet strength, good in compression flowability, small in shrinking percentage, high in surface polishness, the core complex in shape can be made, and the core formed through sintering is high in high temperature strength, large in porosity and quick in depoling.

Description

technical field [0001] The invention relates to a method for preparing a ceramic core, in particular to a method for preparing a water-soluble ceramic core. Background technique [0002] The ceramic core is an adapter for manufacturing investment casting hollow castings. Its function is to form the inner cavity shape of the hollow casting, and together with the shell to ensure the dimensional accuracy of the casting wall thickness, as investment casting moves towards "precision, thin With the development in the direction of "wall and no margin", the performance and engineering reliability of ceramic cores are facing severe challenges. At present, ceramic cores are mainly used in two series of hollow casting cavity structures made of non-ferrous metal alloys and non-ferrous metal alloys. [0003] General ceramic cores are removed by mixed alkali method, alkaline solution method, pressure core removal method, and hydrofluoric acid method. Some of these methods are corrosive t...

AI Technical Summary

Problems solved by technology

Polyethylene glycol with a molecular weight of not more than 1000 has fluidity, and the wet core prepared by the invention has low cohesiveness and poor plasticity, and cannot produce high-precision and complex cores, and cannot meet the requirements of aero-engines, blades, steam turbines, combustion engines, etc. The inner cavity formed by complex ceramic cores such as machines

[0010] The third is that sintering is a very important preparation stage for the manufacture of water-soluble ceramic cores. The sintering process, process, and temperature are extremely important for the production of water-soluble silicon-based ceramic cores with excellent performance. The steps are very simple, and the core performance produced is poor

[0011] In addition, this invention uses tamping or core-shooting methods to prepare wet cores, the accuracy of making cores is not accurate, and it is impossible to make cores with complex structures