Plastic and nonmetallic article shaping or treating: processes – Carbonizing to form article – Agglomeration or accretion
Patent
1985-12-18
1987-06-02
Thurlow, Jeffery
Plastic and nonmetallic article shaping or treating: processes
Carbonizing to form article
Agglomeration or accretion
264 27, 264 293, 264 295, 264 296, 264 85, 264105, 264125, 423448, B29C 3512
Patent
active
046702016
ABSTRACT:
High density composites consisting of graphite and metal borides by pressing blended powders of pitch-free coke and boride powder. The pressing may be hot pressing at temperatures of about 2200.degree. C. and pressure of about 1500 psi or cold pressing at about room temperature followed by high temperature sintering. Some of the boron from the boride diffuses substitutionally into the structure at the processing temperatures promoting graphitization; whereby densification and bonding the resulting degree of graphitization of the shapes is comparable to that of conventional graphite articles processed at temperatures in excess of 2800.degree. C. The mechanical strength of these composites is equivalent to and often exceeds the strength of conventional graphites and the oxidation resistance in dry air is much superior at temperatures as high as 800.degree. C. Overall processing time is reduced from months to days thus improving the economics of the process.
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Criscione John M.
Montgomery Lionel C.
Sonntag James L.
Thurlow Jeffery
Union Carbide Corporation
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