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Fig. 9.6 Examples of
enamel coating obtained by
a wet enamel raw material
and by b dry enamel raw
material; in the case (b) the
bubble segregation near the
external coating face is
highlighted by the dashed
line
Table 9.3
Main characteristics of the coating microstructure
Bubbles percentage
Bubbles diameter (lm)
M.V.
S.D.
M.V.
S.D.
Wet enamel
15
4
17
8
Dry enamel
17
6
15
6
In Table 9.3 , the main microstructure characteristics of the enamel coatings are
summarized. In particular, the bubbles density (also known as blistering) and the
bubbles diameter are analyzed in terms of mean value and standard deviation.
The numerical analyses have been performed by considering the physical and
the mechanical properties, respectively for the metal substrate and the enamel
coating, summarized in Table 9.4 .
In particular, the mechanical performance of low carbon steel was assessed by
tensile tests according to UNI EN 10002. The mechanical properties of vitreous
enamel material (E and m) were estimated by four point bending tests [ 3 ]. The
coefficient of thermal expansion of vitreous enamel material was determined by a
heating dilatometer while the coefficient of thermal expansion for the metal was
taken from the literature [ 1 ].
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