Method for producing a ceramic part with an internal structure
AssigneeHoneywell International Inc.
InventorsChien-Wei Li, Maria Melanie Matic
Life of this patent
Estimating the term…
Abstract
A method for forming a ceramic part with an internal structure includes aqueous slip-casting and a polystyrene foam insert. An aqueous slurry is poured over the insert to form a green body. The insert is shaped to produce the desired internal structure upon being encased by the slurry. The insert is then removed from the green body by dissolving it in trichloroethylene. Because the polystyrene foam does not expand when exposed to trichloroethylene and rapidly dissolves, build up of shrinkage stress in the green body is avoided. The green body is then sintered to produce the ceramic part with an internal structure.
Claims7
A method of forming a ceramic part with an internal structure comprising the steps of:
- a) providing a slurry containing a ceramic;
- b) providing a dissolvable, polystyrene foam insert having a pattern;
- c) pouring the slurry around the insert to form a green body;
- d) dissolving the insert to form the internal structure, said dissolving using trichloroethylene as a solvent so as to dissolve the insert without substantially building up stress in the green body;
- and
- e) drying and sintering the green body to form the ceramic.
Dependencies are inferred from the claim text.