Plastic and nonmetallic article shaping or treating: processes – Carbonizing to form article
Patent
1994-11-07
1997-12-09
Fiorilla, Christopher A.
Plastic and nonmetallic article shaping or treating: processes
Carbonizing to form article
264 296, 264 60, C01B 3100
Patent
active
056956975
ABSTRACT:
The process for the producing improved shaped sintered articles by first shaping a) a mixture of a ceramic or metallic powder or mixtures thereof with a moldable thermoplastic composition containing b) a thermoplastic polyoxymethylene binder and c) a second moldable and essentially inert thermoplastic polymer having a melting point between 90.degree. and 220.degree. C., such as a polyether of bisphenol A and an aliphatic diol. The binder is then removed from the shaped article by exposure to a gaseous acid-containing atmosphere, preferably below its softening temperature, while the second inert thermoplastic polymer is retained as a source of elemental carbon in which the ceramic or metallic powder is finely dispersed. This retained polymer is then pyrolyzed under an inert gas at elevated temperatures of at least 600.degree. C. for conversion to a finely dispersed elemental carbon. The resulting pyrolyzed preformed product is then sintered to obtain the desired high density ceramic and/or metallic article as the final product in which elemental carbon is uniformly and finely distributed. The process provides a simpler and more easily controlled method of incorporating elemental carbon into the ceramic/metallic shaped and sintered product while also carefully controlling the initial shaping step to prevent any formaldehyde induced crosslinking in the thermoplastic binder composition.
REFERENCES:
patent: 4004934 (1977-01-01), Prochazka
patent: 4295890 (1981-10-01), Stroke
patent: 5145900 (1992-09-01), Sterzel et al.
patent: 5198489 (1993-03-01), Sterzel et al.
McKee Graham Edmund
Trubenbach Peter
Wohlfromm Hans
BASF - Aktiengesellschaft
Fiorilla Christopher A.
Shurtleff John H.
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