Method for producing ceramic die core

Abstract

The invention provides a method for producing a ceramic die core. The method comprises the following steps of (1) producing a ceramic die core blank; (2) pre-treating a filler for the shaping of the ceramic die core, specifically adding the filler to be treated into a nonmetal material hopper with de-ionized water, continuously stirring slurry obtained by mixing powder and de-ionized water, continuously dropwise adding analytically pure hydrochloric acid to adjust the pH value of the slurry to 4 to 6, stopping adding analytically pure hydrochloric acid when the pH value is changed by less than or equal to 0.2 within 5 minutes, continuing stirring the slurry for 10 to 60 minutes, standing and settling the slurry for 4 to 12 hours, pouring an upper-layer solution, washing settled powder for 1 to 3 times by using de-ionized water until the pH value of an obtained solution is 6 to 8, drying the powder finally sinking to the bottom at 100 to 140 DEG C, calcining the powder for 4 to 6 hours at 1200 to 1500 DEG C, and crushing and sieving the powder; (3) performing shaping calcination; (4) performing reinforcement reconditioning. The method is simple, economical and low in time consumption, manpower is saved, energy consumption is eliminated, the production efficiency of the ceramic die core is greatly improved, and the quality of the ceramic die core is improved.

Description

technical field [0001] The invention relates to a manufacturing method of a ceramic core, in particular, simple pretreatment is performed on fillers for ceramic core molding, which saves multiple steps of firing fillers with cores, and the surface of the ceramic core baked by the processed fillers is smooth and free of Bumps, peeling, cracks and other defects. Background technique [0002] The ceramic core is a key transition piece for the formation of complex inner cavities during precision casting of gas turbine blades, aeroengine turbine blades and other precision metal parts, which determines the shape and accuracy of the inner cavity of the casting. In order to meet the requirements of precision casting, ceramic cores generally need to meet the following conditions: high refractoriness; Low thermal expansion rate, stable size; Sufficient high temperature strength and low temperature strength; Good chemical stability; Easy to remove. For this reason, the produ...

AI Technical Summary

Problems solved by technology

The disadvantages of this method are low efficiency, heavy workload, and high energy consumption. A batch of materials needs to be roasted five or six times to have a good roasting effect; and each time the core is roasted, it is necessary to use several waste Ceramic core, investing a lot of manpower, material resources and financial resources

At the same time, roasting will reduce the particle size of the filler and reduce the service life of the filler.