The melting point of pure zirconia

Latta, Randall; Duderstadt, E. C.; Fryxell, R.E.

doi:10.1016/0022-3115(70)90218-7

Cited by 16 publications

(2 citation statements)

References 6 publications

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“…On heating, m-ZrO 2 undergoes a phase transition into a tetragonal structure (P4 2 /nmc) near 1170 • C. On further heating it transforms into cubic ZrO 2 (Fm3m) near 2370 • C. Two orthorhombic zirconia phases can also form by cooling Mg-stabilized ZrO 2 and by quenching ZrO 2 powder from 600 • C and 6 GPa (Howard et al 1991). ZrO 2 exists as melts above 2680 ± 15 • C (Latta et al 1970). Our data show that the presence of monoclinic and tetragonal ZrO 2 dominates the decomposed materials.…”

Section: Discussionmentioning

confidence: 99%

Vibrational spectroscopy of fast-quenched ZrSiO₄melts produced by laser treatments: local structures and decomposed phases

Zhang

Salje

Wang

et al. 2005

J. Phys.: Condens. Matter

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Rapidly quenched ZrSiO4 melts produced by CO2 and pulsed YAG lasers have been analysed using infrared (IR) and Raman spectroscopy. The quenched melts exhibit decomposition into binary oxides (ZrO2 and SiO2), while other phases or complex SiO4 tetrahedron networks are also observed. The local structures and the phases of the quenched melts depend strongly on the quenching rate and melting conditions. Monoclinic ZrO2 are found to be the main ZrO2 phase in the samples treated by CO2 laser, although tetragonal ZrO2 was found near boundaries between the untreated and melted regions. High concentrations of tetragonal ZrO2 were detected in the samples treated by pulsed YAG lasers. Our observations indicate that the formation of tetragonal ZrO2 is related to relatively high quench rates. Micro-IR and Raman data from areas near the boundaries between the quenched melts and untreated zircon show systematic variations of local structures and compositions. We observe a small region with relatively low density between the untreated and melted boundaries, which consists of tetragonal ZrO2 or glassy ZrO2, and SiO2. Broad vibrational bands occur in the wavenumber region where the characteristic frequencies of zircon are located. This observation could indicate the possible existence of small amounts of glassy ZrSiO4 in the melt state of zircon, although zircon tends to decompose above the melting point. These observations are in sharp contrast with the behaviour of radiation-damaged zircon, the so-called metamict zircon, where no phase separation occurs in samples which have not been subsequently annealed.

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Section: Discussionmentioning

confidence: 99%

Vibrational spectroscopy of fast-quenched ZrSiO₄melts produced by laser treatments: local structures and decomposed phases

Zhang

Salje

Wang

et al. 2005

J. Phys.: Condens. Matter

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“…Zirconia (ZrO 2 ) continuous fibers are the outstanding ultra‐high temperature thermal insulators and reinforced materials due to the characteristics of high melting point (2715°C), low thermal conductivity, and excellent mechanical strength . Generally, ZrO 2 fibers having the lengths larger than 1.0 m are defined as the continuous fibers .…”

Section: Introductionmentioning

confidence: 99%

Effect of high‐pressure vapor pretreatment on the microstructure evolution and tensile strength of zirconia fibers

et al. 2019

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High-strength zirconia (ZrO 2 ) continuous fibers, which are potential candidates as ultra-high temperature thermal insulators and reinforced materials, are typically fabricated by dry spinning an organozirconium precursor. However, the uncontrolled decomposition of organozirconium precursor usually occurs upon heat treatment that breaks the continuous fibers into pieces, resulting in the loss of tensile strength.Herein, in this contribution, we aimed to maintain the integrity of ZrO 2 precursor fibers during heat treatment. For this purpose, novel high-pressure vapor (HPV) pretreatment of ZrO 2 precursor fiber was introduced. The HPV pretreatment is considered to be efficient for the removal of the organics in precursor, promoting the formation of amorphous structures of Zr(OH) 4 and Zr(OH) 3 HCO 3 . Combining the studies of microstructures and tensile strengths, it was found that the amorphous structures played roles of cross-linking points, keeping the fibers integrity during the followed heat treatment. After HPV pretreatment, the high-strength ZrO 2 continuous fibers would be obtained by direct sintering in air without any atmosphere which substantially lowered the cost. The tensile strengths of sintered ZrO 2 continuous fibers pretreated by an optimized HPV procedure could reach up to as high as 1.299 GPa. The HPV pretreatment method provides a high-efficiency, low-cost technique for preparing high-quality ceramic fibers. K E Y W O R D Shigh-pressure vapor pretreatment, polyaceticzirconium, tensile strength, transition process

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High Zirconia Glass Refractories: An Overview

Davis¹,

Wehrenberg²

2008

48th Conference on Glass Problems: Ceramic Engineering and Science Proceedings, Volume 9, Issue 3/4

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The melting point of pure zirconia

Cited by 16 publications

References 6 publications

Vibrational spectroscopy of fast-quenched ZrSiO₄melts produced by laser treatments: local structures and decomposed phases

Vibrational spectroscopy of fast-quenched ZrSiO₄melts produced by laser treatments: local structures and decomposed phases

Effect of high‐pressure vapor pretreatment on the microstructure evolution and tensile strength of zirconia fibers

High Zirconia Glass Refractories: An Overview

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The melting point of pure zirconia

Cited by 16 publications

References 6 publications

Vibrational spectroscopy of fast-quenched ZrSiO4melts produced by laser treatments: local structures and decomposed phases

Vibrational spectroscopy of fast-quenched ZrSiO4melts produced by laser treatments: local structures and decomposed phases

Effect of high‐pressure vapor pretreatment on the microstructure evolution and tensile strength of zirconia fibers

High Zirconia Glass Refractories: An Overview

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Product

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Vibrational spectroscopy of fast-quenched ZrSiO₄melts produced by laser treatments: local structures and decomposed phases

Vibrational spectroscopy of fast-quenched ZrSiO₄melts produced by laser treatments: local structures and decomposed phases