From Zircon to High Purity Zirconia for Ceramics

Sinha, H. N.

doi:10.1080/08827509208952715

Cited by 9 publications

(6 citation statements)

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“…Zircon dissociation behavior has been reported in the literature [5][6][7][8][9] and can be influenced by impurity content. Specifically, the more impurities contained in zircon, the lower the onset temperature of dissociation.…”

Section: Introductionmentioning

confidence: 99%

Thermal Decomposition of Zircon Refractories

Pavlik

Holland

Payzant

2001

Journal of the American Ceramic Society

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Zircon can be used to make refractory brick for the glass industry. At elevated temperatures it is known to dissociate into silica and zirconia. This study was undertaken because one of the factors that can adversely affect the quality of the glass melted in zircon-lined tanks is the degree of dissociation. The thermal dissociation of purified and unpurified zircon refractory was studied by ambient-and high-temperature X-ray diffraction (HTXRD) to understand the hightemperature performance of brick made from this material. Most of the data were collected on powders at or below 1650°C; however, data were collected between 1400°and 2000°C. In addition, small pieces of the refractory were heated to 1650°C, cooled to room temperature, and then examined under ambient conditions. The degree of dissociation was shown to be dependent on purity, particle size, peak temperature, and time at temperature. The HTXRD dissociation was monitored using the intensity of the tetragonal zirconia peaks. The monoclinic polymorph was measured in the ambient runs. High-temperature mass spectrometry (HTMS) showed that the silica is vaporized at elevated temperatures.

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Section: Introductionmentioning

confidence: 99%

Thermal Decomposition of Zircon Refractories

Pavlik

Holland

Payzant

2001

Journal of the American Ceramic Society

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“…Generally, zircon was hydrolyzed by fusion digestion with sodium hydroxide resulting in the formation of sodium zirconate and sodium silicate as follows (Eq. 2) (Sinha 1992). Sodium flakes were mixed with zircon mineral in a 1.5/1 alkali/mineral ratio and fused for 2 h at 923 K.…”

Section: Zircon Digestion Resultsmentioning

confidence: 99%

Preparation of zirconium oxide nanoparticles from rosette concentrate using two distinct and sequential techniques: hydrothermal and fusion digestion

et al. 2023

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The preparation of zirconium dioxide nanoparticles (ZrO2-NPs) as hard ceramics was accomplished from rosette zircon concentrate through two consecutive alkaline digestion reactions. The rosette zircon concentration in the Abu Khashaba area consists mainly of zircon and monazite minerals. Using different operating conditions, the hydrothermal digestion by autoclave and the conventional alkaline fusion methods was performed upon the non-magnetic concentrate of rosette in order to complete the removal of monazite firstly and to complete the purification of zircon metal secondly. All monazite content and undesirable impurities were removed by the hydrothermal method using optimal digestion conditions such as 4 mol/L NaOH solutions, 1/6 solid to liquid, 2 h dissolving time, and a temperature of 423 K. The residual zircon (84% Zr) was subjected to complete digestion using NaOH with a zircon-to-alkali ratio of 1/1.5 and a fusion temperature of 923 K. ZrO2-NPs were synthesized using the hydrothermal technique at 473 K for 7 h. The calcined ZrO2-NPs were characterized by X-ray diffraction, scan electron microscope, and transmittance electron microscope. Purified silica was also obtained as a by-product from washing solutions of fused zircon.

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“…Other metal oxides like yttrium (stabilizer), magnesium (stabilizer), calcium (stabilizer), hafnium (reduces pore development) and aluminium (prevents water corrosion) are added to stabilize the material. Various tints are also added to get the desired shade (Sinha, 1992 Fracture toughness is the ability of the material to resist crack propagation (Kanninen, 1974). Cracks generally originate from flaws in the material like porosity, or any damage during finishing (Kawaguchi, Yamade and Kishi, 1992).…”

Section: Core Materialsmentioning

confidence: 99%

Zirconia as A Core Material - A Literature Review

2021

cibg

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Teeth that have become severely compromised by decay, large failing restorations, or fracture most often require full-coverage crowns to restore them to their original form and function. A core buildup is a restoration placed in a badly broken down or grossly decayed tooth to restore the bulk of the coronal portion of the tooth. This facilitates the subsequent restoration by means of an indirect extra coronal restoration. The strength of the tooth can be enhanced with intracoronal support. It should have compressive strength to resist intraoral forces and flexural strength to prevent core dislodgement during function. It should also have sufficient flexural strength, biocompatibility, resistance to leakage of oral fluids at the core-tooth interface, ease of manipulation, and ability to bond to remaining tooth structure. The primary purpose of a core build-up is to replace enough missing tooth structure to permit the creation of ideal retention and resistance form in the crown preparation. Materials used for core restoration after endodontic treatment include amalgam, resin composites, zirconia to name a few. The aim of this review is to evaluate the use of zirconia as a core material by assessing the studies available in comparison to other core materials.

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From Zircon to High Purity Zirconia for Ceramics

Cited by 9 publications

References 0 publications

Thermal Decomposition of Zircon Refractories

Thermal Decomposition of Zircon Refractories

Preparation of zirconium oxide nanoparticles from rosette concentrate using two distinct and sequential techniques: hydrothermal and fusion digestion

Zirconia as A Core Material - A Literature Review

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