Combustion chemical vapor deposition (CCVD) of LaPO4 monazite and beta-alumina on alumina fibers for ceramic matrix composites

Crystal chemistry of the monazite structure

“…[12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30] Geochronology: Because natural monazites are often U and Th enriched minerals, radiogenic Pb accumulates quickly through the ␣, ␤ decay sequences in the three natural radioactive families, and reaches, in about 100 Ma, a level where its analysis becomes possible by electron probe microanalysis (EPMA). 31 Assuming that common Pb is negligible, and that radiogenic Pb is kept in the structure all along the time excluding lead loss when ageing, 32,33 the simultaneous measurement of U, Th, and Pb allows to reach the geologically meaningful age from a single electron probe analysis.…”

Combustion chemical vapour deposition of Al2O3 films: Effect of temperature on structure, morphology and adhesion

“…Surface & Coatings Technology j o u r n a l h o m e p a g e : w w w. e l s ev i e r. c o m / l o c a t e / s u r fc o a t distance of droplets in the flame, which is different from the reported burners [13,[15][16][17][18][19][20]. Alumina films were synthesized at various temperatures ranging from 600°C to 900°C.…”

“…Several groups have reported synthesis of alumina coating using C-CVD [13][14][15][16][17][18][19][20]. Among these Hunt et al [13], Hwang et al [16], Hampikian et al [18], Shanmugham et al [19] and Bahlawane [20] have used a neumatic atomizer, and Stollberg et al [15] and Carter et al [17] used an oscillatory capillary nebulizer to generate precursor aerosols.…”

“…Among these Hunt et al [13], Hwang et al [16], Hampikian et al [18], Shanmugham et al [19] and Bahlawane [20] have used a neumatic atomizer, and Stollberg et al [15] and Carter et al [17] used an oscillatory capillary nebulizer to generate precursor aerosols. All of them have used an extra pilot flame to prevent the precursor flame blow off.…”

“…The C-CVD facility was made by coupling the custom made premixed-diffusion type burner with the ultrasonic nebulizer. Though there are reports on synthesis of alumina coatings at high temperatures (1000 to 1250°C) [13,[15][16][17][18][19][20] using C-CVD, reports on synthesis in the low temperature regime (500 to 1000) as well film adhesion strength are scarce. Hence this work was carried out to study the variation of structure, morphology and adhesion of films with deposition temperature below 1000°C.…”