Densification and grain growth behaviour of high-purity MgO ceramics by hot-pressing

Chen, Miaoqin; He, Junjia; Zhang, Yuli; Ding, Zhaochong; Luo, Juhua

doi:10.1016/j.ceramint.2016.10.129

Cited by 21 publications

(3 citation statements)

References 21 publications

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“…This was similar to the sintering of the liquid phase: the mass transfer rate increased and closed pores could be eliminated by the viscous or plastic flow through the material. 26) Therefore, a high-density sintered film could be obtained by high-pressure N 2 annealing. Since sintering is a complex process, the mechanism by which N 2 pressure affects CZTS films should be studied in greater detail.…”

Section: Effects Of N 2 Pressure On Czts Filmsmentioning

confidence: 99%

Achieving composition-controlled Cu₂ZnSnS₄ films by sulfur-free annealing process

Jiang

Wei

Huang

et al. 2017

Jpn. J. Appl. Phys.

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Cu2ZnSnS4 (CZTS) films were firstly prepared by the nonvacuum spin-coating method, and then annealed at 550 °C in N2 atmosphere. A graphite box was used to inhibit the volatilization of gaseous SnS and S2 to suppress the CZTS decomposition and generation of MoS2 during annealing. The sulfur supplementation carried out in a conventional annealing process was not applied in this work. It was found that Sn loss was overcome and the compositions of postannealed films were close to that of precursor solution. Thus, by this method, the compositions of CZTS films can be controlled by adjusting the elemental ratios of the precursor solution. Besides, the increase in inert atmosphere pressure could further minimize the Sn loss and improve the crystallinity of CZTS films. Furthermore, the resistive MoS2 layer between the CZTS film and the Mo layer was suppressed because sulfur was not used and CZTS decomposition was suppressed.

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Section: Effects Of N 2 Pressure On Czts Filmsmentioning

confidence: 99%

Achieving composition-controlled Cu₂ZnSnS₄ films by sulfur-free annealing process

Jiang

Wei

Huang

et al. 2017

Jpn. J. Appl. Phys.

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“…In these processes, the applied pressure has great importance on the rearrangement of the particles during the compaction as well as the densification. The powder compaction not only depends on the applied pressure, but also the nature of thermal environment, the size, the size distribution, and the shape of the particles greatly determine the densities [19,20]. However, the research was focused on the effect of applied pressure on the densification which were correlated by the grain growth to find optimum conditions [21,22].…”

Section: Introductionmentioning

confidence: 99%

Rapid processes for the production of nanocrystal yttria-stabilized tetragonal zirconia polycrystalline ceramics: ultrasonic spray pyrolysis synthesis and high-frequency induction sintering

KOÇ,

ŞAN

2023

Journal of Scientific Reports-A

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In this study, nanocrystalline 3 mol % yttria-stabilized tetragonal zirconia polycrystalline (Y-TZP) ceramic was produced by sintering with a high-frequency induction heating (HFIH) system of granular powders obtained by ultrasonic spray pyrolysis (USP) at 600 °C. The granular nano-sized powders (10-30 nm) were micron in size (average size: 700 nm), spherical in shape and amorphous. The influences of the HFIH sintering temperature (1400-1600 °C), applied current time (60-300 sec.) and the mechanical pressure (10 MPa and 20 MPa) on the final density and grain size of the products were investigated. The amorphous granular Y-TZP powders compressed with the HFIH system allow very rapid condensation in the tetragonal phase at high density and avoid grain growth. High density (relative density over 95) nanocrystalline Y-TZP ceramic with ∼70 nm size could be obtained from the simultaneous application of 20 MPa pressure and an induced current within 300 sec. of sintering time at 1500 °C. In this condition, the sample’s maximum hardness and fracture toughness values were reached at 14.9 GPa and 3.8 MPa·m1/2, respectively. Y-TZP powders produced in nano-micro structure with the USP system were sintered with the HFIH system and rapid production was achieved by preventing grain growth.

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“…Magnesia (MgO) is an important building material that can be used as cementitious materials (such as Sorel cements, reactive magnesia cements, and magnesium phosphate cements), thermal insulation wall materials, expansion agent for mass concrete, etc. MgO is generally produced by calcining magnesite (Equation ) and classified into three grades according to different calcination temperatures: (a) light‐burned MgO (750‐1000°C) is the most commonly used MgO for cementitious materials due to its high chemical reactivity, (b) hard‐burned MgO (1000‐1400°C) is successfully used as expansion agent in dam concrete due to the volume expansion during its reaction with water (Equation ); (c) dead‐burned MgO (>1400°C) is a major component of magnesium phosphate cement and also usually found as periclase in portland cements .…”

Section: Introductionmentioning

confidence: 99%

Effect of MgO calcination temperature on the reaction products and kinetics of MgO–SiO₂–H₂O system

Yang

Zhang

et al. 2018

J Am Ceram Soc

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MgO‐based binders have been widely studied for decades. Recently, the MgO–SiO2–H2O system was developed as a novel construction material, however, its reaction mechanism remains unclear. This paper investigated the reaction products and kinetics of MgO/silica fume (SF) pastes with MgO calcinated at different temperatures. The results indicate that MgO presented larger grain size after calcination at higher temperature. Mg(OH)2 and magnesium silicate hydrate (M–S–H) gel were formed when using MgO calcined at 850, 950, and 1050°C. However, only M–S–H gel was formed when using MgO calcined at 1450°C. The reaction kinetics of MgO could be described using α = 1 − e−k*t. The reaction rate of MgO increased with decreasing calcination temperature, increasing SF dosage, and the addition of sodium hexametaphosphate. Only M–S–H gel was formed when the reaction rate of MgO was below the demarcation line (about 0.250 × 10−6 s−1), and the corresponding demarcation area was around 14 days.

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Densification and grain growth behaviour of high-purity MgO ceramics by hot-pressing

Cited by 21 publications

References 21 publications

Achieving composition-controlled Cu₂ZnSnS₄ films by sulfur-free annealing process

Achieving composition-controlled Cu₂ZnSnS₄ films by sulfur-free annealing process

Rapid processes for the production of nanocrystal yttria-stabilized tetragonal zirconia polycrystalline ceramics: ultrasonic spray pyrolysis synthesis and high-frequency induction sintering

Effect of MgO calcination temperature on the reaction products and kinetics of MgO–SiO₂–H₂O system

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Densification and grain growth behaviour of high-purity MgO ceramics by hot-pressing

Cited by 21 publications

References 21 publications

Achieving composition-controlled Cu2ZnSnS4 films by sulfur-free annealing process

Achieving composition-controlled Cu2ZnSnS4 films by sulfur-free annealing process

Rapid processes for the production of nanocrystal yttria-stabilized tetragonal zirconia polycrystalline ceramics: ultrasonic spray pyrolysis synthesis and high-frequency induction sintering

Effect of MgO calcination temperature on the reaction products and kinetics of MgO–SiO2–H2O system

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Achieving composition-controlled Cu₂ZnSnS₄ films by sulfur-free annealing process

Achieving composition-controlled Cu₂ZnSnS₄ films by sulfur-free annealing process

Effect of MgO calcination temperature on the reaction products and kinetics of MgO–SiO₂–H₂O system