Phase changes of ceramic whiteware slip-casting bodies studied by XRD and FTIR

Lavat, Araceli Elisabet; Grasselli, María Cristina; Tasca, Julia

doi:10.1016/j.ceramint.2006.03.016

Cited by 25 publications

(9 citation statements)

References 11 publications

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“…01-089-1471 corresponding to anorthite feldspar or calcium aluminum silicate. These results are consistent with the XRD peak pattern results, as previously reported by Lavat et al 25 The XRD peak patterns of the porcelain clay powder and commercial ceramic hand mold are similar to the XRD peak patterns of stoneware clay powder and stoneware hand mold: mullite or aluminosilicate (Al 2 O 3 .SiO 2 ) and alumina corresponding to the JCPDS file nos. 00-081-0026 and 01-075-1865; silica corresponding Figure 8.…”

Section: Characteristics Of Plaster and Stoneware Hand Moldssupporting

confidence: 92%

Efficient stoneware hand mold for slip casting in natural rubber latex glove preparation

Tangboriboon

Teeraroengrit

Chawhuaymhak

et al. 2020

Progress in Rubber, Plastics and Recycling Technology

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Disposal medical gloves are an important product to maintain hygienic conditions, ensuring security for patients and safeguarding against infections. They are used in many fields, such as dental and medical, beauty and cuisine, food and pharmaceutical industries. Presently, aging populations and an emerging middle class in developing countries require medical gloves at a higher volume. Therefore, the demand for medical gloves increases continuously. In this work, two types of hand molds were prepared from stoneware clay and plaster to be used in the natural rubber glove preparation. The ceramic stoneware and plaster hand molds were prepared by the slip casting. The obtained stoneware hand molds were found to be superior to the commercial hand molds. Natural rubber latex (NRL) gloves were fabricated by dipping the stoneware hand mold coated with a coagulant into the NRL compound using the sulfur curing system at 120°C for 30 min. The latex solid:water weight ratio, drying and firing temperatures, and firing time used to prepare stoneware hand molds were found to affect the adsorption–adhesion properties between the mold surface and the NRL films. The obtained NRL films were further characterized for the physical properties such as appearance, film thickness, tackiness, and effusion of the phase formation by X-ray diffraction, the microstructure by scanning electron microscope, and the mechanical properties. The NRL glove films prepared by the stoneware hand mold possessed the high percentage elongation at break and the maximum load stress equal to 1343.30 ± 78.36% and 12.74 ± 2.34 MPa, respectively. On the other hand, the latex glove films prepared by the plaster hand mold with 80 consistency provided the percentage of elongation at break and the maximum load stress equal to 531.76 ± 2.54 and 21.01 ± 0.08 MPa, respectively.

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Section: Characteristics Of Plaster and Stoneware Hand Moldssupporting

confidence: 92%

Efficient stoneware hand mold for slip casting in natural rubber latex glove preparation

Tangboriboon

Teeraroengrit

Chawhuaymhak

et al. 2020

Progress in Rubber, Plastics and Recycling Technology

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“…18 Illite and muscovite may be characterized by the OH-stretching around 3620 cm -1 , accompanied by the broad absorption at 3400 cm -1 . 16 The peaks in the range 815 and 746 cm -1 indicate the presence of Si-O-Al where Al is in tetrahedral co-ordination supporting the earlier observation of the possible presence of sericite/muscovite minerals. The peaks in the range 539 and 477 cm -1 are due to octahedral AlO 6 sheet vibrations.…”

Section: Characterization Of Pyrophyllitesupporting

confidence: 74%

“…15 The peak at 1120 cm -1 can be assigned to Al-OH vibration. 16 This band is formed by the vibrations of oxygen, common to tetrahedron and octahedron, and the Si-O vibration that is perpendicular to the silicate layers. 17 The peak at 950 cm -1 may be attributed to Al-OH vibrations.…”

Section: Characterization Of Pyrophyllitementioning

confidence: 99%

Non-Isothermal Kinetic Evaluation of Pyrophyllite Dehydroxylation

Shamim

Molla

Mukhopadhyay

et al. 2014

Transactions of the Indian Ceramic Society

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Dehydroxylation of clay minerals is an important process with several applications. Despite the industrial use of several well defined clay minerals, only the dehydroxylation kinetics of kaolinite has been reported. Still, the kinetics of these solid state reactions is yet to be understood using unambiguous model. In the present work, we have performed detailed kinetic analysis of dehydroxylation of pyrophyllite clay using non-isothermal kinetics by thermogravimetry (TG) at different heating rates. The TG data has been analysed initially with model-free methods (ASTM E 698, ASTM 1641, Friedman analysis and Ozawa-Flynn-Wall method). Interestingly, both the model-free methods of analysis have unequivocally indicated that activation energy (E act ) changes very marginally with progress of reaction and a single activation energy barrier is present. This surmises that the dehydroxylation process is a single stage process. A multivariate non-linear regression on the dynamic thermal data at different heating rates has been performed to determine the most probable kinetic model based on statistical fit. It has been found that, TG data provides best fit with regression coefficient (r 2 ) value of 0.994, when a single stage Avrami type diffusion reaction model is assumed, and an activation energy of 159 kJ.mol -1 .

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“…The absorption peaks at 459, 778 and 798 cm -1 correspond to the vibration of non-bridging oxygen (Si-O-). The peaks at 778 and 798 cm -1 correspond also to the vibration of non-bridging oxygen (Si-O-) associated with K + , and the peaks 700, 1081 and 1169 cm -1 correspond to the vibration of bridging oxygen (Si-O-Si) while the peak at 544 cm -1 corresponds to the vibration of (Si-O-Al) for the sample sintered at 1160 °C for 2 h [43][44][45][46]; this peak may belong to the mullite phase. The sharp spitted band corresponding to (Si-O-Si) is a diagnosis to identify quartz.…”

Section: Resultsmentioning

confidence: 99%

Sintering and dielectric properties of a technical porcelain prepared from economical natural raw materials

et al. 2016

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In this study, the production of a technical porcelain, for the ceramic dielectric applications by using economical natural raw materials, was investigated. The basic porcelain composition was selected consisting of 30 wt% kaolin, 45 wt% potash-feldspar and 25 wt% quartz. The obtained phases in the sintered samples were investigated by X-ray diffraction, Fourier transform infrared spectroscopy analysis, and scanning electron microscopy images. It has been confirmed by these techniques that the main crystalline phases were quartz and mullite. Dielectric measurements of technical porcelains have been carried out at 1 kHz from room temperature to 200 °C. The dielectric constant, loss factor, dielectric loss tangent, and resistivity of the porcelain sample sintered at 1160 °C were 22-25, 0.32-1.80, 0.006-0.07, and 0.2-9 x 10 13 W.cm, respectively. The value of dielectric constant was significantly high when compared to that of conventional porcelains which did not exceed generally 9. ResumoNeste estudo, foi investigada a produção de uma porcelana técnica para aplicações cerâmicas dielétricas pelo uso de matériasprimas naturais de baixos custos. A composição básica da porcelana foi selecionada consistindo de 30% de caulim, 45% de feldspato potássico e 25% de quartzo. As fases obtidas nas amostras sinterizadas foram investigadas por difração de raios X, espectroscopia no infravermelho com transformada de Fourier e imagens de microscopia eletrônica de varredura. Foi confirmado por estas técnicas que as principais fases cristalinas foram quartzo e mulita. Medidas dielétricas das porcelanas técnicas foram realizadas a 1 kHz entre a temperatura ambiente de 200 °C. A constante dielétrica, fator de perda, tangente de perda dielétrica e resistividade da amostra de porcelana sinterizada a 1160 °C foram 22-25, 0,32-1,80, 0,006-0,07 e 0,2-9 x 10 13 .cm, respectivamente. O valor de constante dielétrica foi significativamente alto quando comparado ao de porcelanas convencionais que geralmente não excede 9. Palavras-chave: porcelana, caulim, feldspato, quartzo, sinterização, propriedades dielétricas.

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Phase changes of ceramic whiteware slip-casting bodies studied by XRD and FTIR

Cited by 25 publications

References 11 publications

Efficient stoneware hand mold for slip casting in natural rubber latex glove preparation

Efficient stoneware hand mold for slip casting in natural rubber latex glove preparation

Non-Isothermal Kinetic Evaluation of Pyrophyllite Dehydroxylation

Sintering and dielectric properties of a technical porcelain prepared from economical natural raw materials

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