Soluble core and preparation method thereof

Abstract

The invention provides a soluble core and a preparation method thereof. Main components of the core comprise silica sol binder, mica powder filler, active agents and plasticizer, wherein the mass ratio of the silica sol binder to the mica powder filler is 20:80-30:70; the active agents account for 10 to 30 percent of the sum of the silica sol binder and the mica powder filler; the plasticizer content accounts for 1 to 5 percent of the total mass of the silica sol binder, the mica powder filler and the active agents; and the mass ratio of paraffin to polyethylene in the plasticizer is 5:95-20:80. The preparation method significantly reduces the cost of the soluble core by adopting silica sol as binder. In addition, the soluble core has high strength and certain toughness, can guarantee thesmooth molding of wax molds, can be easily lost in aqueous media under the condition without damaging the performances and shapes of the wax molds, and can meet the requirements of manufacturing high-quality castings.

Description

technical field [0001] The invention belongs to the technical field of casting, and in particular relates to a soluble core for investment precision casting and a preparation method thereof. Background technique [0002] With the increasingly high requirements for precision casting parts in the fields of electronics, automobile industry and aerospace, the shape of parts is becoming more and more complex, especially the complex inner cavity structure brings great difficulty to investment precision casting. If a ceramic core is used to form the inner cavity structure, the cost is high and time-consuming, especially after the casting is formed, it is difficult to remove the ceramic core. In addition, the chemical substance will also damage the casting itself when the ceramic core is removed; If the cavity is relatively large, the inner cavity can be formed with a soluble core, which can greatly reduce the difficulty of manufacturing wax molds for precision casting. The wax mold...

AI Technical Summary

Problems solved by technology

Urea has poor thermal stability, the formed inner cavity has low dimensional accuracy, poor surface quality, low strength, high brittleness, and releases ammonia gas, which not only pollutes the environment, corrodes the mold, but is also harmful to the human body; molten salts are prone to cold shrinkage, Cracking, high brittleness, difficult processing, and low dimensional accuracy; polyethylene glycols are of good quality, but the price is high, so it is necessary to develop a new type of soluble core that is cheap and can guarantee the production of castings with an inner cavity structure