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; Vertruyen, Benedicte; Boschini, Frédéric

doi:10.1007/s11666-013-9952-5

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.

2013 • In Journal of Thermal Spray Technology, 22 (7), p. 1133-1139

Peer Reviewed verified by ORBi

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https://hdl.handle.net/2268/158735

DOI
10.1007/s11666-013-9952-5

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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 :

Issue :

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

Available on ORBi :

since 25 November 2013

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