Investigation of coating properties in the Al2O3 - TiO2 system obtained by thermal spraying with feedstock powders and water-based suspensions
Investigation of coating properties in the Al2O3 - TiO2 system obtained by thermal spraying with feedstock powders and water-based suspensions
Tuesday, May 28, 2019: 14:30
Annex Hall/F202 (Pacifico Yokohama)
ÿþI n t h i s w o r k , d i f f e r e n t c o a t i n g c o m p o s i t i o n s i n t h e s y s t e m A l 2 O 3 - T i O 2 ( A l 2 O 3 - 3 w t % T i O 2 , A l 2 O 3 - 1 3 w t % T i O 2 a n d A l 2 O 3 - 4 0 w t % T i O 2 ) p r o d u c e d b y d i f f e r e n t t h e r m a l s p r a y i n g m e t h o d s : A t m o s p h e r i c P l a s m a S p r a y i n g ( A P S ) , S u s p e n s i o n A t m o s p h e r i c P l a s m a S p r a y i n g ( S - A P S ) a n d S u s p e n s i o n - H i g h V e l o c i t y O x y g e n F u e l S p r a y i n g ( S - H V O F ) , w e r e i n v e s t i g a t e d . T h e m o t i v a t i o n b e h i n d t h e u s e o f S - A P S a n d S - H V O F l a i d i n t h e d i f f i c u l t i e s w i t h u s i n g c o n v e n t i o n a l A P S f o r p r o d u c t i o n o f f i n e l y - g r a i n e d c o a t i n g s . T h e a i m o f t h i s s t u d y w a s i n v e s t i g a t i o n o f t h e i n f l u e n c e o f s p r a y f e e d s t o c k ( m i c r o - s i z e d p o w d e r s a n d w a t e r - b a s e d s u s p e n s i o n s o f f i n e d i s p e r s e d p a r t i c l e s ) p r o p e r t i e s a n d s p r a y p r o c e s s e s o n t h e c o a t i n g p r o p e r t i e s .
T h e c o a t i n g s w e r e i n v e s t i g a t e d i n t e r m s o f t h e i r m i c r o s t r u c t u r e a n d s e l e c t e d m e c h a n i c a l p r o p e r t i e s ( V i c k e r s m i c r o h a r d n e s s , a d h e s i o n p u l l - o f t e s t ) . T h e s l i d i n g w e a r r e s i s t a n c e w a s i n v e s t i g a t e d b y t h e c o n v e n t i o n a l b a l l - o n - d i s c ( B o D ) i n a c c o r d a n c e t o A S T M G 9 9 " 1 7 s t a n d a r d . T h e s p r a y p r o c e s s h a s a m a j o r i n f l u e n c e o n t h e m o r p h o l o g y a n d c o a t i n g p r o p e r t i e s . C o r r e l a t i o n s b e t w e e n V i c k e r s m i c r o h a r d n e s s , Y o u n g ' s m o d u l u s a s w e l l a s f r a c t u r e t o u g h n e s s ( K C ) a n d t h e c o a t i n g m o r p h o l o g y w e r e f u n c t i o n o f f e e d s t o c k a n d s p r a y p r o c e s s e s w e r e p r o p o s e d .
K e y w o r d s : p l a s m a s p r a y i n g , A P S , S - A P S , S - H V O F , c o a t i n g m i c r o s t r u c t u r e , a d h e s i o n , m i c r o h a r d n e s s , Y o u n g ' s m o d u l u s , f r a c t u r e t o u g h n e s s , s l i d i n g w e a r r e s i s t a n c e