Coating processes – Direct application of electrical – magnetic – wave – or... – Pretreatment of substrate or post-treatment of coated substrate
Patent
1992-03-30
1993-08-24
Pianalto, Bernard
Coating processes
Direct application of electrical, magnetic, wave, or...
Pretreatment of substrate or post-treatment of coated substrate
427226, 427237, 427238, 427253, 427255, 427274, 427294, 4273835, 427557, 427585, 427595, B05D 302
Patent
active
052387100
ABSTRACT:
A method for the production of ceramic matrix composites by chemical vapor infiltration. The method includes exposing an infiltrated preform to microwave energy, with pressure variation of the reactant gases in the processing chamber and/or temperature variation of the preform during processing, to produce substantially improved composites. The process provides higher deposition rates within the core of the ceramic matrix composite, higher densification which advantageously initiates within the interior of the ceramic matrix composite and proceeds radially outward, and a thick wall ceramic matrix composite with an overall reduced density gradient.
REFERENCES:
patent: 4580524 (1986-04-01), Lackey, Jr. et al.
patent: 4596741 (1986-06-01), Endou et al.
patent: 4663230 (1987-05-01), Tennent
patent: 4929328 (1990-05-01), Besmann et al.
patent: 4960640 (1990-10-01), Paquette et al.
Evans et al., A Mathematical Model for Microwave-Assisted Chemical Vapor Infiltration, Mat. Res. Soc. Symp. Proc. vol. 189, pp. 101-107 (1991).
I. Ahmad, "Effect of Microwave Heating on the Solid State Reactions and Mass Transport in Ceramics", Abstract of Doctoral Dissertation, University of Florida, 1991.
A. S. De, et al. "Microwave (Hybrid) Heading of Alumina at 2.45 GHz: II. Effect of Processing Variables, Heating Rates and Particle Size" Ceramic Transactions, vol. 21, p. 329 (1991).
Ahmad, et al., Microwave Power and Electromagnetic Energy, vol. 26, No. 3, p. 128 (1991).
A. S. De, et al., "Microwave (Hybrid) Heating of Alumina at 2.45 GHz: I Microstructural Uniformity and Homogeneity" Ceramic Transactions, vol. 21. p. 319, (1991).
Ahmad Iftikhar
Paquette Edward L.
Silberglitt Richard
Pianalto Bernard
Technology Assessment & Transfer, Inc.
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