Design of Experiment in Synthesis of Improved Thermal Stable Sol-Gel Non-Stick Coatings- the Function of Pigment and Filler Par.pdf

1、In many applications involving coatings, functional particles such as pigments and inertfillers/extenders are utilized which are usually impermeable to water and fluids.These particlesinfluence the coating properties and

2、 the precise effect on the coating properties depends on thecharacteristics such as shape, particle size and the pigment volume concentration.
　　 The objective of this project is to use experimental design to investi

3、gate the effect ofincorporating micro-sized inorganic/oxide pigment and filler particles on non-stick property(anti-adhesive property) and thermal stability of sol-gel ceramic coatings.The inorganicpigments and filler pa

4、rticles selected are thermal stable and have excellent barrier properties tothe diffusion of water, oxygen and deleterious ionic fluids.
　　 Sol-gel processing method was used to incorporate fillers such as hollow gla

5、ss (Al2O3, Fe2O3,CaO, MgO, Na2O, K2O), barites/Barytes (BaSO4), wollastonite (CaSiO3), mica (Al6H4K2O4Si6),alumina (Al2O3) and iron oxide red (F2O3) pigment particles into the coating and deposited onaluminum substrate b

6、y air-spraying method and cured at 260℃.In order to determine which ofthe incorporated particles have significant effect on non-stick property (surface energy), PencilHardness, Adhesion, Surface Roughness, Thickness, a t

7、wo-level (23) half-fraction factorialscreening design of experiment was used for the design and coating formulation.The Analysis ofvariance (ANOVA) from the Design of Experiment (DOE) indicates that none of theincorporat

8、ed particles have significant influence on the surface energy or non-stick property ofcoatings.However, Wollastonite fillers caused an increase in coating surface roughness whilstinteraction between Barites filler and ir

9、on oxide pigment were able to reduce coating surfaceroughness.
　　 In contrast, all the five (5) main experimental factors and their ten (10) interactions hadsignificant effect on adhesion and thickness results.To fur

10、ther understand how theseexperimental factors influence coating properties, coating composition and morphology werecharacterized using FTIR, SEM, and Energy Dispersive Spectroscopy (EDS).The resultsobtained indicated tha

11、t densified, non-porous sol-gel ceramic coatings with low surfaceroughness have been deposited.The EDS spectra also confirmed the presence of elements suchas Si, C, O, Ba, and Fe, Al coming from inorganic particles and s

12、ol used in the formulationsignifying deposition of a complex metal-oxide or ceramic coatings.Non-stick cooking testperform for 150 minutes at 260℃ indicate that coatings maintained their thermal stability andsubsequently

13、 recorded a decrease in surface energy after 150 minute of heating.This resultsindicates that repeated sintering, as a result the cooking test culminated in the decomposition oforganic methyl(-CH3) functional groups of t

14、he Polydimethylsiloxane (PDMS) leaving behindinorganic backbone to form a highly densified, fully oxidized siliceous ceramic coatings withreduce porosity which lead to the reduction of the surface energy.This indicate th