Characterisation of porcelain compositions using two china clays from Cameroon

Kamseu, Elie; Leonelli, Cristina; Boccaccini, Dino Norberto; Veronesi, Paolo; Miselli, Paola; Pellacani, Gian Carlo; Melo, Uphie Chinje

doi:10.1016/j.ceramint.2006.01.025

Cited by 115 publications

(86 citation statements)

References 9 publications

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“…The result is also in agreement with previous work reported by other authors [1,9]. The result of porosity tests carried out on the samples is as presented in figure 3.…”

Section: Resultssupporting

confidence: 93%

“…The shrinkage test was carried out on the samples by determining the initial length before firing (Lo) and the length after firing (Lf) using digital venier caliper. The Percentage linear shrinkage was determined using equation (1). The flexural strength was determined using a universal testing machine (MTS 810.23M), in three-point bending fixture, 70 mm support span and with a crosshead speed of s0.5mm min-1.…”

Section: Characterization Of the Samplesmentioning

confidence: 99%

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Development and Characterization of Parian Bodies Using Feldspar from Two Selected Deposits in Nigeria

Toluwalope¹

2016

APJES

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Self glazed bodies also called Parian Bodies are chiefly composed of Feldspar which majorly acts as flux in reducing the melting temperature of the particular ceramic body thereby reducing the stress of double firing a ceramic product. In this present research work, Okpella and Ijero-Ekiti feldspar deposits in Nigeria together with other raw materials were utilized to develop parian bodies which are very suitable for making ceramic tiles, dolls and figurines. Chemical analyses were carried out on the raw materials using X-ray fluorescence (XRF) in order to ascertain their suitability for developing parian bodies. Six compositions were made from these two deposits using a standard parian body composition of 70% feldspar. The samples were shaped, dried and sintered between 1050 o C -1250 o C at the interval of 50 0 C. Flexural strength, fired shrinkage, porosity and water absorption tests were used to characterize the samples. The results showed that samples fired at 1200 0 C and 1250 0 C exhibited technological properties that meet up with ISO standards. The two feldspar deposits were found to be suitable for developing parian bodies.

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“…The result is also in agreement with previous work reported by other authors [1,9]. The result of porosity tests carried out on the samples is as presented in figure 3.…”

Section: Resultssupporting

confidence: 93%

Section: Characterization Of the Samplesmentioning

confidence: 99%

Development and Characterization of Parian Bodies Using Feldspar from Two Selected Deposits in Nigeria

Toluwalope¹

2016

APJES

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“…Data for this study was collected from 12 articles [29][30][31][32][33][34][35][36][37][38][39]. It is reported in these articles that mineralogical analyses were carried out using the X-Ray Diffraction (XRD) method, whereas major oxides were determined using one of the following: X-Ray Fluorescence (XRF) spectrometry, Inductively Coupled Plasma-Mass Spectrometry (ICP-MS) or Atomic Absorption Spectroscopy (AAS).…”

Section: Methodsmentioning

confidence: 99%

Geochemistry of Selected Kaolins from Cameroon and Nigeria

et al. 2017

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Abstract:The geochemical characteristics of selected kaolins from Cameroon and Nigeria are presented, with an attempt to elucidate on their possible industrial applications by comparing them to world-known kaolin deposits. Major oxides concentrations were subjected to factor analyses in interpreting their relationships. Geochemical indices, including chemical index of alteration (CIA), chemical index of weathering (CIW) and the index of compositional variability (ICV) were computed and plotted on binary and ternary diagrams to determine the intensity of weathering of the kaolins and discriminate their different source rock types. Kaolinite was the major phase, followed by quartz, illite and goethite as minor phases. Minerals in trace phases included smectite, anatase, muscovite, gibbsite, microcline, palygorskite and calcite. Mean abundances of major oxides in wt% were: SiO 2 (56.96)>Al 2 O 3 (24.09)>Fe 2 O 3 (3.78)>TiO 2 (1.53)> K 2 O (1.26)> MgO (0.27)>CaO (0.20)>Na 2 O (0.17)>P 2 O 5 (0.05)>MnO (0.04). The CIW versus CIA and ICV versus CIA plots showed that most of the kaolins clearly depicted extreme silicate weathering. The current applications of kaolins from Cameroon and Nigeria include ceramics and manufacturing of bricks and tiles. Low MgO, CaO, Na 2 O, K 2 O and TiO 2 further position the kaolins for pharmaceutics, cosmetics, rubber and plastic applications. Thus, the studied kaolins have the potential to contribute to improved economic development of these countries.

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“…Em um desses poucos trabalhos, Piva et al [11] observou que o efeito deletério na constante dielétrica e tangente de perdas causado pela presença do Fe 2 O 3 está vinculado a não solubilização deste óxido nas fases da porcelana. De acordo com seus resultados, a utilização de matérias-primas com maiores concentrações de Fe 2 O 3 do que a atualmente utilizada não traria grandes alterações nas propriedades dielétricas, porém possibilitaria ganhos econômicos significativos em relação à aquisição de insumos e na etapa de sinterização, uma vez que a presença deste óxido reduz o preço das matérias-primas e diminui a temperatura de queima [12].…”

Section: Introductionunclassified

Microestrutura, fases cristalinas e propriedades elétricas de porcelanas aluminosas contendo diferentes concentrações de Fe2O3sinterizadas em atmosfera redutora e oxidante

Piva

Venturini

et al. 2015

Cerâmica

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INTRODUÇÃOPorcelanas triaxiais têm sido por década utilizadas como isoladores elétricos. Essa hegemonia se da devido as suas propriedades dielétricas combinadas com suas excelentes propriedades mecânicas e, principalmente, a capacidade de manutenção dessas propriedades em condições severas, como: umidade e alta temperatura [1]. De uma maneira geral, as porcelanas elétricas são essencialmente compostas de caulim e/ou argila, feldspato e quartzo [2]. Frequentemente, em porcelanas de alta tensão, o quartzo é parcialmente ou totalmente substituído por coríndon para aumentar a resistência mecânica do produto final [3]. Quando tratada termicamente de forma adequada, essas matérias-primas formam uma matriz vítrea com cristais de quartzo/coríndon, mulita e porosidade remanescente [4]. A ação sinérgica destas fases é responsável pelas propriedades acima mencionadas, ao passo que uma adequada seleção das matérias-primas é de suma importância para as características finais do produto.Um dos pré-requisitos na seleção de matérias-primas

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Characterisation of porcelain compositions using two china clays from Cameroon

Cited by 115 publications

References 9 publications

Development and Characterization of Parian Bodies Using Feldspar from Two Selected Deposits in Nigeria

Development and Characterization of Parian Bodies Using Feldspar from Two Selected Deposits in Nigeria

Geochemistry of Selected Kaolins from Cameroon and Nigeria

Microestrutura, fases cristalinas e propriedades elétricas de porcelanas aluminosas contendo diferentes concentrações de Fe2O3sinterizadas em atmosfera redutora e oxidante

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