Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – Of inorganic materials
Patent
1977-03-25
1981-05-19
Parrish, John
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
Of inorganic materials
264 51, 264 86, C04B 3558
Patent
active
042684668
ABSTRACT:
A method of forming a slip cast article having at least one zone of cellular construction is disclosed. The method may be utilized to make articles having zones of different cellular size as well as articles having zones of cellular construction adjacent zones of noncellular construction. In its simplest form, the method is carried out by providing a slip casting mold which has a casting volume formed therein. A stabilized casting slip is poured into the casting volume. The pH of the stabilized casting slip is increased until a hydrolysis reaction takes place between the water forming the vehicle and an oxidizable metal forming the casting material. This hydrolysis reaction results in the evolution of gases, some of which are trapped within the slip to develop a zone of cellular construction. The greater the increase in pH, the more vigorous is the hydrolysis reaction and the resulting cellular construction has larger sized cells. The hydrolysis reaction may be terminated to produce a zone of noncellular construction.
REFERENCES:
Ezis, Ceramics for High Performance Applications, pp. 207-222, 1974.
Ford Motor Company
Johnson Olin B.
Johnson William E.
Parrish John
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