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Download PDF by R. W. Ford: Ceramics Drying

By R. W. Ford

ISBN-10: 0080334679

ISBN-13: 9780080334677

Describes the drying behaviour of clay-based and non-clay ceramics by way of the exterior stipulations influencing the speed of evaporation, and the interior mechanism almost about moisture circulate and shrinkage. The paintings in most cases considers the sensible points in terms of difficulties and faults which come up throughout the drying of a preshaped article, even supposing a theoretical remedy of the drying strategies is equipped for these requiring a deeper wisdom of this crucial topic.

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W i t h clay, t h e r a t e o f s e t t l i n g is u s u a l l y m u c h s l o w e r , b e c a u s e its p a r t i c l e s a r e s m a l l e r a n d t h e final s e d i m e n t e d v o l u m e is m u c h g r e a t e r t h a n t h e v o l u m e o c c u p i e d b y t h e dry p o w d e r . W h e r e a s t h e s e d i m e n t e d clay r e t a i n s a h i g h d e g r e e o f fluidity, t h e s e d i m e n t e d b e d o f q u a r t z is r i g i d a n d difficult t o r e d i s p e r s e b y s h a k i n g .

8 % . O v e r w h a t r a n g e a r e t h e lengths o f t h e dry unfired bricks likely to vary o w i n g to variations in m o i s t u r e c o n t e n t at t h e t i m e o f extrusion? (The volumetric drying-shrinkage ML characteristics o f t h e clay were = 1 0 . 9 % S = 3 7 . 7 , VD = 4 8 . 2 ) . V o l u m e t r i c d r y i n g - s h r i n k a g e (dry basis) = + M — Vo ι 1 X 100% (see p a g e 3 7 ) . C o n s i d e r a b r i c k d r i e d from t h e m i n i m u m m o i s t u r e c o n t e n t ( 1 9 .

T h e s e forces p r o b a b l y arise f r o m t h e negative electrical charges o n the surface of the particles, with the particles a t t e m p t i n g to distribute themselves within the liquid m e d i u m s o as t o g i v e m a x i m u m s e p a r a t i o n . Since plastic clay has a yield p o i n t a n d retains a n y s h a p e i m p r e s s e d u p o n it b y a n e x t e r n a l f o r c e , r e p u l s i v e f o r c e s b e t w e e n p a r t i c l e s a t t h e surface o f the s h a p e m u s t be balanced by s o m e force h o l d i n g the The Internal Mechanism of Drying 33 Φ Α Clay particle Clay particle Fig.

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Ceramics Drying by R. W. Ford


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