Reference : Mullite plasma spraying for in situ repair of cracks in mullite refractories: Simulta...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Chemistry
Mullite plasma spraying for in situ repair of cracks in mullite refractories: Simultaneous optimization of porosity and thickness by statistical design of experiments
Schrijnemakers, Audrey [Université de Liège - ULiège > Département de chimie (sciences) > LCIS - GreenMAT >]
Francq, B. G. [ISBA, Institute of Statistics, Biostatistics and Actuarial Sciences, University of Louvain-la-Neuve, 1348 Louvain, Belgium]
Cloots, Rudi [Université de Liège - ULiège > Département de chimie (sciences) > LCIS - GreenMAT >]
Vertruyen, Benedicte mailto [Université de Liège - ULiège > > >]
Boschini, Frédéric [Université de Liège - ULiège > > Plateforme APTIS >]
Journal of Thermal Spray Technology
Yes (verified by ORBi)
[en] Additional experiments ; Experimental parameters ; Interaction term ; Measured properties ; Prediction interval ; Simultaneous optimization ; Stand-off distance (SoD) ; Statistical design of experiments ; Coatings ; Cracks ; Design of experiments ; Mullite ; Optimization ; Plasma jets ; Plasma spraying ; Porosity ; Refractory materials ; Silicate minerals ; Repair
[en] We report a laboratory-scale study about the suitability of the plasma spraying process for "in situ" repair of cracks in mullite refractories of industrial furnaces. The "design of experiments" approach is used to investigate how the coating porosity and thickness are influenced by six experimental parameters. Arc current, secondary gas (H 2) flow rate, and stand-off distance are the most significant parameters for both responses. Several interaction terms also affect significantly the thickness response. The validity of the model equations is discussed both from a statistical point of view and regarding the physical credibility of the main model terms. Additional experiments confirm that the measured properties lie into the prediction intervals provided by the model. Using a set of parameters optimized for minimal porosity and high thickness (relevant for the crack repair application), coatings with 6% porosity and 1070 μm thickness can be prepared reproducibly. © 2013 ASM International.
Région wallonne : Direction générale des Technologies, de la Recherche et de l'Energie - DGTRE
Project PLASMAREPA – Grant agreement n°5651
Researchers ; Professionals

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