Investment casting shells having an organic component

摘要

A composition for use in investment casting shells and a method of making the composition is disclosed. The composition includes an engineered binder and a refractory flour. The engineered binder comprises a siliceous material and at least one organic component selected from: at least one type of wood pulp; at least one species of cellulose fiber; and combinations thereof. A particular benefit of the investment shell composition is simultaneously increased permeability and load bearing capacity.

主权项

1. A composition for use in investment casting consisting of:
an engineered binder comprising colloidal silica, a polymer, wood pulp, and water; and refractory flour; wherein the engineered binder is present in the composition at a concentration of from about 5 wt % to 38 wt % based on the composition, and the wood pulp comprises fibers having an average length of from about 0.005 mm to about 100 mm, and an average diameter of from about 1 μm to about 100 μm.