Coating processes – Solid particles or fibers applied – Applying superposed diverse coatings or coating a coated base
Patent
1987-12-07
1990-01-09
Bell, James J.
Coating processes
Solid particles or fibers applied
Applying superposed diverse coatings or coating a coated base
427193, 427204, 427226, 427370, B05D 136
Patent
active
048927554
ABSTRACT:
A porous substrate is formed from an agglomeration of fibers preferably has a carbonaceous composition and a binder is applied to the substrate. The binder may illustratively be an acrylic or beeswax to vaporize during pyrolysis or may illustratively be a phenolic resin, a furfural resin or pitch to retain pyrolyzed carbon on the fibers after pyrolysis. A mixture of particles having the same approximate size as the diameter of the fibers is then applied to the fibers to become mechanically locked in the substrate pores. The mixture may contain (a) a first material (preferably a compound containing boron) which oxidizes and melts at a relatively low temperature and is relatively viscous when melted, (b) a second material (preferably a compound containing silicon) which oxidizes and has an increased melting temperature and is more viscous than the first material when melted and (c) a refractory material (preferably a compound containing zirconium) having a considerably higher melting temperature oxide than the first and second materials. The first material may be obtained from group 3a of the periodic table, the second material from group 4a of the periodic table and the third material from groups 4b and 5b of the periodic table. An impermeable coating such as a carbide, oxide or a nitride is thereafter applied to the substrate. The impermeable coating tends to crack at elevated temperatures. The adjacent particles in the mixture melt and flow into the cracks to inhibit crack amplification, the ease of flow is dependent upon the proportions of the first, second and third materials on the mixture. The particles displaced in the mixture from the cracks remain mechanically looked to the substrate.
Bell James J.
Roston Ellsworth R.
Schwartz Charles H.
Science Applications International Corporation
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