Magnesium doped .beta.-aluminum titanate thin film coating

Coating processes – Immersion or partial immersion

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427226, 1062862, 1062864, 1062865, 501127, 501128, 501131, 501134, 501136, B05D 118

Patent

active

055652450

ABSTRACT:
Mg.sub.x Al.sub.2-2x Ti.sub.1+x O.sub.5 (x.ltoreq.0.2) protective coatings have been developed for both dense and porous substrates, such as SiC and Si.sub.3 N.sub.4, using a chemical solution processing method involving the hydrolysis and condensation of magnesium, aluminum and titanium precursors. The solution viscosities, pH values, H.sub.2 O/alkoxide molar ratios, and dip coating withdrawal rates which are optimum for crack-free Mg.sub.x Al.sub.2-2x Ti.sub.1+x O.sub.5 (x.ltoreq.0.2) are 1.0 to 6.2 cP, pH 1-4.5, molar ratio 1.5-10, and withdrawal rate of 2.2-8.0 cm/min, respectively. Conversion of the amorphous coating to crystalline Mg.sub.x Al.sub.2-2x Ti.sub.1+x O.sub.5 (x.ltoreq.0.2) is achieved by a succession of calcination below 450.degree. C. and a final heat treatment above 1000.degree. C. for ten hours with controlled heating and cooling rates.

REFERENCES:
patent: 5008222 (1991-04-01), Kameda
patent: 5153153 (1992-10-01), Freudenberg et al.
patent: 5407479 (1995-04-01), Sun et al.
Prasadarao et al., "Enhanced Densification by Seeding of Sol-Gel-Derived Aluminum Titanate", J. Am. Ceram. Soc., 75(6) 1529-33 (1992).

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