High-alumina porcelain with the addition of a Li2O-bearing fluxing agent

Oberžan, M.; Holc, Janez; Buh, M.; Kuščer, Danjela; Lavrač, I.; Kosec, M.

doi:10.1016/j.jeurceramsoc.2009.01.029

Cited by 20 publications

(11 citation statements)

References 23 publications

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“…Os autores conseguiram uma redução de 100-120 ºC na temperatura de gresificação e concluíram que os teores de Li 2 O não devem exceder ~1,5%, para não se perder em densificação das peças [14]. O uso de espodumênio, com aporte de 1 a 1,6% de Li 2 O à massa, mostrou-se benéfico para produção de porcelanas de alta alumina, com ganho de densificação, resistência mecânica e diminuição da temperatura de queima [15].…”

Section: Rocha Com Espodumênio Como Fundente Para Massas Cerâmicas Trunclassified

Rocha com espodumênio como fundente para massas cerâmicas tradicionais

2010

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ResumoInvestigou-se a atuação de uma rocha com espodumênio como fundente em massas cerâmicas, analisando-se sua reatividade com outras matérias-primas, como quartzo e caulim. Primeiramente, caracterizou-se petrograficamente o pegmatito de onde se extrai esse fundente. Posteriormente avaliou-se o comportamento de moabilidade, fundência e deformação piroplástica da rocha com espodumênio. Analisou-se então sua influência nas propriedades tecnológicas finais das peças, principalmente em relação à temperatura de queima, às fases e à microestrutura. Comparou-se a gresificação com outros fundentes comerciais como a albita e o feldspato. O espodumênio mostrou maior capacidade de reduzir a temperatura de gresificação das peças que os fundentes tradicionais, promovendo a densificação por fluxo viscoso. Palavras-chave: cerâmica tradicional, espodumênio, fundentes, queima. Abstract A spodumene rock was used as a flux in ceramic bodies, analyzing its reactivity to other raw materials such as quartz and kaolin. The petrology properties of the pegmatite (parent rock) from which

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Section: Rocha Com Espodumênio Como Fundente Para Massas Cerâmicas Trunclassified

Rocha com espodumênio como fundente para massas cerâmicas tradicionais

2010

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“…16 Thus, the addition of a mineral containing lithium, such as petalite, spodumene, lepidolite, hectorite, etc, is an attractive option to control the amount and viscosity of the liquid phase during porcelain firing. 16,17,18 Particularly, petalite not only softens the glass matrix in the porcelain but also enhances mullite crystallization. Although doping with Li + has significant potential to obtain a low WA and PI, studies on the PD of Li + doped porcelain have rarely been reported.…”

Section: Introductionmentioning

confidence: 99%

Low water absorption and pyroplastic deformation of alumina‐strengthened porcelain with petalite and Gairome clay

Hao

Akatsu

A³

et al. 2020

Int J Applied Ceramic Tech

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The pyroplastic deformation (PD) of porcelain is a key issue for reducing production loss. In this study, material design to realize both a low water absorption (WA) and low PD in alumina‐strengthened porcelain, which have a trade‐off relationship, was proposed. In this porcelain material design, a rigid microstructure composed of entangled needle‐like mullite crystals is formed by the addition of Gairome clay, which has the positive effect of suppressing PD but negatively affects densification. This was balanced by the controlling the amount and viscosity of the liquid phase in the porcelain fired at elevated temperatures with optimized quantities of added petalite and Gairome clay to obtain a low WA and low PD. As a result, a WA below 0.5% and PD index below 1.5 × 10−6 mm−1 in a wide firing temperature range from 1194 to 1384°C were obtained for porcelain containing Amakusa clay at 37.8 mass%, Gairome clay at 17.0 mass%, petalite at 13.7 mass%, and alumina at 31.5 mass%.

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“…The use of lithium-bearing minerals as a liquid-phase sintering aid has been investigated in various ceramics, to reduce the firing temperature or to improve the thermal-shock resistance of the ceramics [10][11][12][13][14][15]. The effects of CaO-Li 2 O-K 2 O-Na 2 O as fluxing agents in porcelain ceramic tiles was discussed by Zhou et al [16], who showed that a multicomponent eutectic system can produce a liquid phase at a lower temperature.…”

Section: Introductionmentioning

confidence: 99%

Sintering Behavior and Technological Properties of Low-Temperature Porcelain Tiles Prepared Using a Lithium Ore and Silica Crucible Waste

Peng

Qin

2019

Minerals

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Porcelain tiles are a building material that has been widely used in recent years and that consumes substantial resources during the sintering process. This study reports on the production of low-temperature porcelain tiles by using low-grade lithium ore (LO) and silica crucible waste (SCW) in a new SiO2–Al2O3–Na2O–K2O–Li2O system. The firing temperature of the porcelain tiles was reduced from 1260 °C to 1070 °C by adding 30% LO instead of feldspar in a modified triaxial ceramic body, and SCW was recycled and used as a raw material. These actions help to reduce the carbon emissions produced during sintering and achieve sustainable development. The effect of phase transitions on the sintering and technological properties of the porcelain tiles was studied by quantitative phase analysis, using X-ray diffraction (XRD). Secondary mullite (0–19%) can be formed at 1040–1100 °C, where more quartz and cristobalite will be retained, which increases the rupture modulus of the porcelain tiles. While the vitreous phase increases rapidly at 1100–1160 °C, the closed pores (0.1–33.1%) will simultaneously expand, causing a decrease in compactness. The results show that low-grade LO (with a cost similar to that of feldspar) allows for the production of porcelain tiles with better process performance at lower temperatures (≤1100 °C).

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High-alumina porcelain with the addition of a Li2O-bearing fluxing agent

Cited by 20 publications

References 23 publications

Rocha com espodumênio como fundente para massas cerâmicas tradicionais

Rocha com espodumênio como fundente para massas cerâmicas tradicionais

Low water absorption and pyroplastic deformation of alumina‐strengthened porcelain with petalite and Gairome clay

Sintering Behavior and Technological Properties of Low-Temperature Porcelain Tiles Prepared Using a Lithium Ore and Silica Crucible Waste

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