Simultaneous optimization of linear firing shrinkage and water absorption of triaxial ceramic bodies using experiments design

Correia, Sivaldo Leite; Hotza, Dachamir; Segadães, Ana M.

doi:10.1016/j.ceramint.2003.10.013

Cited by 70 publications

(51 citation statements)

References 7 publications

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“…The mathematic model is valid, when the error (difference between measured and calculated values) is uncorrelated and randomly distributed with a zero mean value and a common variance (Cornell, 2002;Myers and Montgomery, 2002;Correia et al, 2003). (Table 2).…”

Section: Discussionmentioning

confidence: 99%

Simultaneous Optimisation of Drying Parameters of Ceramic Bodies

Mahmoudi¹,

Srasra²,

Zargouni³

2014

American Journal of Geoscience

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This study deals with the mineralogical, physico-chemical and geotechnical analyses of representative Aptian clays in the north-east of Tunisia. X-ray diffraction reveals a predominance of illite (50-60 wt.%) associated to kaolinite and interstratified illite/smectite. The accessory minerals detected in raw materials are quartz, calcite and Na-feldspar. The average amounts of silica, alumina and alkalis are 52, 20 and 3.5 wt.%, respectively. The contents of lime and iron vary between 4 and 8 wt.%. Physical analyses show that the cation exchange capacity is 34.1-45.7meq/100g of air-dried clay. The plasticity test shows medium values of plasticity index (16-a28 wt.%). The linear drying shrinkage is weak (less than 0.99 wt.%) which makes these clays adapt to fast drying. The firing shrinkage and the expansion are limited. A lower firing and drying temperature can be translated into significant energy savings. Currently, these clays are used in the industrial process for the manufacturing of the earthenware tiles. For the better exploitation of the materials and improvement of production conditions, a mathematical formalism is established for the drying parameters. The regression models relate drying shrinkage (d), bending strength after drying (b) and residual moisture (r) with the moisture (m) and the pressing pressure (p).

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Section: Discussionmentioning

confidence: 99%

Simultaneous Optimisation of Drying Parameters of Ceramic Bodies

Mahmoudi¹,

Srasra²,

Zargouni³

2014

American Journal of Geoscience

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“…Para este fim, é necessário em primeiro lugar selecionar as misturas apropriadas a partir da qual da superfície de resposta pode ser obtida. A partir da superfície de resposta uma previsão do valor da propriedade em análise pode ser obtida por qualquer mistura, com base em mudanças nas proporções dos seus componentes [27]. Esta metodologia tem encontrado aplicações importantes em diversas áreas tecnológicas [14,28,29].…”

Section: Introductionunclassified

Efeitos De Aditivos Poliméricos Nas Propriedades Reológicas E De Filtração De Fluidos De Perfuração

Lucena¹,

Lira²,

Amorim³

2014

TMM

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ResumoA influência da carboximetilcelulose, CMC, (redutor de filtrado) e da goma xantana (viscosificante), nas viscosidades aparente e plástica, no limite de escoamento e no volume de filtrado na composição de fluidos de perfuração à base de água foi investigada com base no delineamento estatístico. Cinco formulações compostas por uma faixa de concentração utilizada comercialmente foram utilizadas na concepção da experiência. As formulações foram preparadas de acordo com os padrões da empresa Petrobras. Foram calculados modelos de regressão, correlacionando as propriedades com as composições. A importância e a validação dos modelos foram confirmadas pela análise estatística. O desenho estatístico pode ser aplicado para otimizar as propriedades da lama considerando adição de CMC e da goma xantana, e para obter um melhor entendimento sobre a influência de aditivos sobre as propriedades de polímeros de sistemas de fluidos de base água. A partir do estudo observou-se que os valores das propriedades reológicas variaram com a concentração dos aditivos, aumentando com o aumento da concentração dos mesmos, e que o aumento da concentração dos aditivos promoveu uma diminuição dos valores dos parâmetros de filtração. Palavras-chaves: Fluidos poliméricos; Viscosificante; Redutor de filtrado; Delineamento estatístico. EFFECTS OF PROPERTIES POLYMERIC ADDITIVES IN RHEOLOGIC AND DRILLING FLUIDS AbstractThe influence of carboxymethylcellulose, CMC (filtrate reducer) and xanthan gum (viscosifier) in plastic and apparent viscosity at yield strength and the volume of filtrate in the composition of drilling fluids based on water was investigated based on statistical design. Five formulations consist of a range of concentrations used commercially were utilized in the design of the experiment. The formulations were prepared in accordance with company standards Petrobras. Regression models were calculated and correlated with the properties of the compositions. The relevance and validation of the models were confirmed by statistical analysis. The design can be applied to statistically optimize the mud properties considering the addition of CMC and xanthan gum, and to provide a better understanding of the influence of additives on the properties of polymer-based fluid system water. From the study it was observed that the values of the rheological properties vary with the concentration of additives, increasing with increasing concentration of the same, and that the concentration of the additives caused a decline of parameter values filtration. Keywords: Polymeric fluids; Viscosifier; Filtrate reducer; Statistical design. INTRODUÇÃOA incorporação de polímeros como componentes de fluidos de perfuração figura atualmente como uma das principais alternativas para adequação das propriedades que o fluido deve apresentar na atividade de perfuração de poços de petróleo [1].Os fluidos de perfuração apresentam várias propriedades físico-químicas que devem ser levadas em consideração durante sua aplicação [2]. As soluções poliméricas colocam-se como ...

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“…us, the rubber compound engineer most often needs to produce an optimised formulation, which ts the requirements of physical and mechanical properties, while subjected to processing and cost constraints [18]. In industrially oriented applications of materials like rubbers or ceramics, the technique generally used to optimise equality and inequality property constraints is the graphical overlay of contour plots generated by the regression models of the properties [10,15,[19][20][21]. However, as the number of functions and constraints increases, so do the di culties to handle and design the di erent contour plots, and these strategies begin to have a rather limited performance.…”

Section: Introductionmentioning

confidence: 99%

Property Optimisation of EPDM Rubber Composites Using Mathematical and Statistical Strategies

Correia

Palaoro

Segadães

2017

Advances in Materials Science and Engineering

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is paper describes a study in which EPDM-based rubber composites were investigated aiming at developing formulations subjected to restrictions on cost and the properties of the material. e contents of components other than calcium carbonate, para nic oil, and CBS vulcanising accelerator, as well as additives and processing conditions, were kept constant. Fractional factorial design coupled with computational numerical optimisation was used to minimise the number of mixtures. e results demonstrate that statistical design of experiments and particle swarm optimisation (PSO) algorithms are promising methods to design composition variables. Mixture costs as low as 1.92 US$/kg can be achieved in compositions containing, for example, 107 phr of calcium carbonate, 95 phr of para nic oil, and 1.13 phr of CBS accelerator. e corresponding composite propertypredicted values were 66.8 Shore A for hardness, tensile strength of 7.8 MPa, 570.8% elongation at break, and 23.0% rebound resilience. is demonstrates that, in this way, the desired product with speci ed characteristics can be comfortably manufactured at minimum cost.

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Simultaneous optimization of linear firing shrinkage and water absorption of triaxial ceramic bodies using experiments design

Cited by 70 publications

References 7 publications

Simultaneous Optimisation of Drying Parameters of Ceramic Bodies

Simultaneous Optimisation of Drying Parameters of Ceramic Bodies

Efeitos De Aditivos Poliméricos Nas Propriedades Reológicas E De Filtração De Fluidos De Perfuração

Property Optimisation of EPDM Rubber Composites Using Mathematical and Statistical Strategies

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