Refractory laminate based on negative sols or silicates and polycationic organic compounds

Abstract

Abstract A rapid process for forming a refractory laminate on the surface of a support structure which comprises dipping the structure in a bath comprising a sol of negatively charged collidal particles of an inorganic substance and/or a solution of an alkaline ionic silicate to form a coating on the surface, contacting the coated surface with a polycationic organic setting agent to firmly set the negative sol or silicate solution. This procedure is repeated until a laminate of the desired thickness is built up on the surface. In order to increase the rate of laminate build-up particulate refractory material can be included in the bath and/or the coated surface can be stuccoed between dips. Interaction between the negatively charged colloidal particles or silicate and the polycationic organic setting agent results in the polymerization of the colloid or silicate and aggregation of particles and thereby the immobilization of the coatings. This technique makes it possible to successively apply and set coatings to build ceramic laminates in very short times without intermediate drying and without sloughing of coats. The process is particularly suited for making expendable, refractory shell molds for precision investment casting of metals by the so-called ''''lost wax'''' technnique.

Inventors

• 👤 E Moore

Bibliographic Details