Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – Shaping against forming surface
Patent
1978-10-31
1980-07-29
Arnold, Donald J.
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
Shaping against forming surface
264 60, 264 65, 264 66, C04B 3556, C04B 3564
Patent
active
042150884
ABSTRACT:
The present invention is directed to the fabrication of boron carbide articles having length-to-diameter or width ratios greater than 2 to 1. The process of the present invention is practiced by the steps comprising hot pressing boron carbide powder into article segments or portions in which the segments have a length-to-diameter or width ratio less than 1.5, aligning a plurality of the initially hot-pressed segments in a hot-pressing die with the end surfaces of the segments placed in intimate contact with one another, and then hot pressing the aligned segments into an article of the desired configuration. The resulting article exhibits essentially uniform density throughout the structure with the bonds between the segments being equivalent in hardness, strength, and density to the remainder of the article.
REFERENCES:
patent: 2207786 (1936-01-01), Ridgway et al.
patent: 3003885 (1961-10-01), Mandorf
patent: 3632710 (1972-01-01), Jahn
patent: 3729372 (1973-04-01), Matchen et al.
patent: 3730826 (1973-05-01), Matchen et al.
patent: 3859399 (1975-01-01), Bailey
patent: 3976735 (1976-08-01), Benton
patent: 4071372 (1978-01-01), Bird
Ardary Zane L.
Reynolds Carl D.
Arnold Donald J.
Hamel Stephen D.
Larcher Earl L.
Lupo R. V.
The United States of America as represented by the United States
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