Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – By mechanically introducing gas into material
Patent
1990-05-08
1991-11-12
Derrington, James
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
By mechanically introducing gas into material
432258, 432259, F27B 914
Patent
active
050645889
ABSTRACT:
A method of manufacturing elongate ceramic articles including a plurality of firing stages.
In a pre-firing stage, an elongate ceramic shaped-body is held in a first attitude and subjected to a pre-firing at a predetermined pre-firing temperature to form a pre-fired-body.
In the final firing stage, the pre-fired-body is held in a second attitude, which is different from the first attitude and in which the longitudinal direction of the pre-fired-body is oriented substantially in a vertical direction, and the pre-fired-body is subjected to a firing at a temperature not less than the pre-firing temperature.
The method of the invention allows elongate ceramic articles to be manufactured, without accompanying formation of cracks or fractures induced by tensile stresses due to dead weight of the shaped-body itself. The article so manufactured has substantial homogeneity dimensions and performances throughout the entire length thereof.
REFERENCES:
patent: 1485132 (1924-02-01), Styffe
patent: 1513617 (1924-10-01), Litt
patent: 3230596 (1966-01-01), Batigne
Derrington James
NGK Insulators Ltd.
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