Evaluation of Kalalani vermiculite for production of high strength porcelain insulators

Ngayakamo, B.; Park, S. Eugene

doi:10.2298/sos1902223n

Cited by 7 publications

(5 citation statements)

References 13 publications

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“…Secondary Mullite (SM) characterised as elongated needle-shaped crystals from Primary Mullite crystals [27]. As mentioned before, the addition of alumina and zircon together with the spodumene increasing mullite crystals contributed to increase hardness, elastic modulus and strength [28]. Both needles and cuboidal mullite crystals are common in all bodies.…”

Section: Microstructural Analysis (Sem)mentioning

confidence: 90%

Development of optical, microstructural and mechanical properties of porcelain stonewares

et al. 2021

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New production systems developed in recent years made it possible to improve different aesthetic appearance and large sizes for porcelain stonewares. In order to produce these tiles, optical and mechanical properties of the porcelain stonewares should be improved. Optical and mechanical properties also related with microstructure. In this study, spodumene, alumina and zircon were used to improve the microstructure of the porcelain stonewares and consequently their optical and mechanical properties. The wear resistance of porcelain stonewares is the one of the most important mechanical properties. In this study, a different test method was used because the existing wear test methods on the tiles were insufficient. The solid particle impingement method using alumina particles was used to determine wear resistance of the porcelain stoneware bodies.

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Section: Microstructural Analysis (Sem)mentioning

confidence: 90%

Development of optical, microstructural and mechanical properties of porcelain stonewares

et al. 2021

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“…The needle morphology is similar to the mullite grains [28,40,44], under certain condition of growth stress strain induction in material during crystallization, crystals from in which the growth is rapid in one direction, developing filamentary crystals that are presumably free from gross imperfection [42]. This morphology might present a reinforcement mechanism in the materials [24,35,37], specially taking into account that these needles are generally monocrystalline, because they grow in situ during the thermal treatment [43]. Further analysis of this particular needle phase should be of interest, but falls out of the scope of this article.…”

Section: Sintering Parameters and Textural Propertiesmentioning

confidence: 91%

“…No other phase was identified, and no important thermal effect was observed in the 1350-1500 °C range. The typical thermochemical processes of the kaolinite alumina mixtures occur below this temperature [12,35,36]. The amount of mullite developed (primary and secondary) [37] corresponds to the kaolinite present in the starting raw material [2].…”

Section: Developed Crystalline and Non-crystalline Phasesmentioning

confidence: 99%

High macroscopic neutron capture cross section ceramics based on bauxite and Gd2O3

et al. 2020

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The effect of the addition of Gadolinium oxide (Gd2O3) up to 10 wt.% in bauxite was studied and its thermal behavior compared with pure bauxite. The incorporation of Gd2O3 is of technological interest for the design of smart traceable ceramic proppants used for unconventional gas and oil well stimulation. These high macroscopic neutron capture cross section proppants are used to obtain relevant information, such as the location and height of the created hydraulic fractures, through a neutron based detection technology. The study comprised a set of thermal and sintering behavior analyses up to 1500 ?C of mixtures up to 10 wt.% addition of Gd2O3. The developed texture and microstructure was also assessed. A simple mechanical characterization was performed as well. Fully-dense pore-free microstructures were developed, with alumina and mullite as the main crystalline phases. Gadolinium secondary and ternary alumino-silicate phases were also observed after thermal treatment. These present a needle morphology that might result in reinforcement mechanisms. No important glassy phase was detected; although sintering was enhanced, the Gd2O3 oxide main role was found to be as a sintering aid rather than a strict flux agent. The mechanical behavior remained fragile with the rare oxide addition. In fact, the mechanical resistance increased up to 20 wt.% for the 10 wt.% added sample. The oxide addition together with the bauxite dehydroxilation mass loss resulted in materials with up to 1.5 x 105 (c.u.) macroscopic neutron capture cross section materials. The obtained results permit to define design strategies of high macroscopic neutron capture ceramic materials for wellbore and developed fractures description.

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“…Due to its exceptional thermal, fire, and sound insulation properties, it is also suitable for use as an aggregate in lightweight concrete and plaster. According to Park and Ngayakamo, Kalalani vermiculite can be used as a raw ingredient in the production of porcelain insulators of high strength Ngayakamo & Park (2019).…”

Section: Introductionmentioning

confidence: 99%

The Relationship Between Bending Strength and Porosity in Ceramic Brick That Contains Vermiculite

Önen,

Boyraz

2024

Int. J. Eng. Sci. Tech

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This study focused on the characterization, product, and relationship between bending strength and porosity of ceramic bricks with added vermiculite. To achieve this goal, pre-made bodies containing 0%, 10%, and 20% calcined vermiculite by weight were mixed in to create the body compositions. Alumina ball manufactories homogenized fusions (60 rpm, 24 hours) were molded through uniaxial dry pressing (100 MPa). Additionally, the arranged samples were heated to a temperature of 800-1000 °C for a duration of 1 hour. Tests involving phase analysis (XRD), microstructure (SEM), mechanical properties (three point bending), and physical characteristics (Porosity, water absorption, shrinkage and bulk density) were carried out on the demitasse bodies that were manufactured. The data that was collected was displayed in graphs and tables, showing the results. As a result, the packages containing samples of vermiculite were effectively created, and the best parameters were easily displayed. The findings indicate that the quality of flawed packages improves as calcined vermiculite levels rise. Following the characterization results, the correlation between bending strength and porosity was investigated. Correlations, t-tests, and p-values were computed. The inclusion of vermiculite in ceramic bricks results in a significant negative correlation of -0.769 between their bending strength and porosity characteristics.

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Evaluation of Kalalani vermiculite for production of high strength porcelain insulators

Cited by 7 publications

References 13 publications

Development of optical, microstructural and mechanical properties of porcelain stonewares

Development of optical, microstructural and mechanical properties of porcelain stonewares

High macroscopic neutron capture cross section ceramics based on bauxite and Gd2O3

The Relationship Between Bending Strength and Porosity in Ceramic Brick That Contains Vermiculite

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