Fluorophlogopite porcelain based on talc–feldspar mixture

Mustafa, Emad

doi:10.1016/s0272-8842(00)00035-3

Cited by 16 publications

(5 citation statements)

References 17 publications

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“…In the second step, the nucleated body is heated to a higher temperature, frequently above the softening point of the precursor glass, to allow growth of crystals on these nuclei. 9,13 In the present work, the optimum crystallisation temperature was established from the thermal analysis results. The cooling rate was regulated to achieve the desired porcelain.…”

Section: Discussionmentioning

confidence: 99%

“…The crystallised phases are expected to improve the mechanical strength, while retaining good machinability and translucency. 9,10 The crystallisation of platy mica crystals alongside leucite adds strength and reinforces the glassy phase, resulting in flexural strength approximately twice that of leucite porcelain. It thus becomes easier to address the problem of translucency loss through crystallisation of leucite and to improve the strength and machinability through crystallisation of mica in the porcelain.…”

Section: Discussionmentioning

confidence: 99%

“…The prepared porcelain has high enough mechanical strength to substitute porcelain on metal restorations. [8][9][10][11][12] A leucite-mica phase mix crystallised in porcelain was previously prepared with a higher softening point of 820uC, making it too refractory a composition for dental applications. Another disadvantage is the formation of forsterite as a parasitic phase during mica crystallisation.…”

Section: Introductionmentioning

confidence: 99%

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Low fusion fluorophlogopite–leucite containing porcelain

El-Meliegy¹

2004

British Ceramic Transactions

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Low fusion fluorophlogopite-leucite containing porcelain was prepared for use in dental restorations without metal substrates. Simultaneous crystallisation of fluorophlogopite and leucite phases with uniform evenly dispersed grains was achieved. Platy mica crystals and tetragonal leucite colonies crystallised in the porcelain to add strength through reinforcement of the glassy matrix. Further, chemical composition and the crystallisation process were regulated to avoid the formation of a parasitic forsterite phase. Crystallisation of fluorophlogopite begins at 620uC and of leucite at 750uC. Optimum crystallisation of the leucite-mica phase mixture in the porcelain was realised on heating between 850-930uC for 5-15 min.BCT/0419

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Low fusion fluorophlogopite–leucite containing porcelain

El-Meliegy¹

2004

British Ceramic Transactions

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“…At the present time, studies of machinable ceramics were concentrated on fabrication and performance. Little research was conducted on machining technology of machinable ceramics [9,10]. This paper analyzed the wear characteristic of tools wear in turning fluorophlogopite glass-ceramics, through with high-speed steel, tungsten-cobalt carbide and ceramic (Si 3 N 4 ) tools.…”

Section: Introductionmentioning

confidence: 99%

Study on Influencing of Technological Parameter with Tools Wear during Turning Fluorophlogopite Glass-Ceramics

Lian

2008

KEM

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The characteristic of tools wear is analyzed through turning fluorophlogopite glass-ceramics. And the process of tools wear can be divided into three periods. Through single factor test, the influence of tools wear was discussed such as tool material, cooling conditions, cutting depth and feed speed. The study indicates, the tools material and cooling condition are major factors to affect tools wear. The high-speed steel tool is not suitable for turning fluorophlogopite. Because sustaining time of cutting is short and efficiency is low in machining, the tungsten-cobalt carbide tool is not perfect tool. And ceramics tool is better than the both. The tools wear rate can be decreased under cooling conditions. Influential curve of tools wear rate versus cutting depth is a part of parabola curve.

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“…One fundamental shortcoming in all of the synthetic fluormicas is their high coefficient of thermal expansion > 90×10 -7 °C-1 with consequent poor resistance to thermal shock [1][2][3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Compressive Properties of Quartzite Microcrystallite Glass Ceramics

Zhang

2007

KEM

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Quartzite microcrystallite glass ceramics is one of the most promising machinable ceramic materials due to its many outstanding properties. The density of quartzite microcrystallite glass ceramics is smaller than the aluminum alloy and its thermal conductivity approaches to the zirconia and its elastic module is also very small; All these advantages meet the requirements for structural components to work at higher temperature; Compressive properties of quartzite microcrystallite glass ceramics had been studied at room temperature and 500°C in this paper; The specimens had been aged at 1000°C for 5, 10, 20, 30 hours, respectively. Through SEM observations of the fracture surface of the specimens, the microstructural changes had been determined; The tests showed: the compressive property of the machinable glass ceramic declined as the ageing time increasing; but the compressive property of the specimen aged for 10 hours was inferior to that aged for 20 hours; Then compressive property declined as the ageing time increasing. The SEM observation indicated that with the extend of ageing time, the grains grew bigger and microporous and microcracks increased in the specimens; Comparing the compressive property at room temperature with that at 500°C, one found that the change of compressive property was very small when the ageing time was the same; With the extend of ageing time, the curve of the compressive property changed from smooth curves to broken lines.

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Fluorophlogopite porcelain based on talc–feldspar mixture

Cited by 16 publications

References 17 publications

Low fusion fluorophlogopite–leucite containing porcelain

Low fusion fluorophlogopite–leucite containing porcelain

Study on Influencing of Technological Parameter with Tools Wear during Turning Fluorophlogopite Glass-Ceramics

Compressive Properties of Quartzite Microcrystallite Glass Ceramics

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