Article (Scientific journals)
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; Francq, B. G.; Cloots, Rudi et al.
2013In Journal of Thermal Spray Technology, 22 (7), p. 1133-1139
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Keywords :
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
Abstract :
[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.
Disciplines :
Chemistry
Author, co-author :
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  ;  Université de Liège - ULiège
Boschini, Frédéric ;  Université de Liège - ULiège > Plateforme APTIS
Language :
English
Title :
Mullite plasma spraying for in situ repair of cracks in mullite refractories: Simultaneous optimization of porosity and thickness by statistical design of experiments
Publication date :
2013
Journal title :
Journal of Thermal Spray Technology
ISSN :
1059-9630
eISSN :
1544-1016
Publisher :
ASM International, United States - Ohio
Volume :
22
Issue :
7
Pages :
1133-1139
Peer reviewed :
Peer Reviewed verified by ORBi
Name of the research project :
Project PLASMAREPA – Grant agreement n°5651
Funders :
DGTRE - Région wallonne. Direction générale des Technologies, de la Recherche et de l'Énergie [BE]
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since 25 November 2013

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