Hot-pressing of bimodally distributed magnesium fluoride powder

Moghim, Mohammad Hadi

doi:10.1016/j.infrared.2010.07.011

Cited by 6 publications

(3 citation statements)

References 15 publications

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“…They could demonstrate that eliminating the pores and increasing the relative density are the main factors that affect transparency. With respect to this result, a second study followed, reporting the preparation of dense polycrystalline MgF 2 ceramics by using MgF 2 powders of two different sizes 21. The first powder was synthesized by a precipitation method with NaF and MgCl 2 , and the second powder was commercial microsized MgF 2 that was treated by milling.…”

Section: State Of the Art Of Mgf2mentioning

confidence: 99%

Tailor‐Made MgF₂‐Based Catalysts by Sol–Gel Synthesis

2011

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In this paper, recent developments in the field of catalysts based on nanosized metal fluorides are presented with special focus on the exciting and promising magnesium fluoride systems. The majority of these new catalyst systems originate from the work of the authors based on the fluorolytic solgel synthesis of metal fluorides, which was developed by this group. They are selected in a way as to highlight the principles and prospects of this new approach to high-surfacearea, strongly distorted metal fluorides. This new fluorolytic

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Section: State Of the Art Of Mgf2mentioning

confidence: 99%

Tailor‐Made MgF₂‐Based Catalysts by Sol–Gel Synthesis

2011

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“…ere are some important point as follows. e peak point at 2.8 µm wavelength corresponds to the hydroxylate absorption stretching band (OH stretching), the peak point at 4.3 µm wavelength corresponds to the carbon dioxide absorption stretching band, the peak point at 5 µm wavelength corresponds to the bifluoride absorption stretching band, the peak point at 6.7 µm wavelength corresponds to the OH-banding, and other peak points at 3 µm and 6.1 µm wavelengths correspond to the bands caused by the humility [7]. In general, it is difficult to manufacture magnesium fluoride ceramic without infrared absorption bands by operating the hot-pressing technique in the open air.…”

Section: Introductionmentioning

confidence: 99%

Enhancing the Quality of the Characteristic Transmittance Curve in the Infrared Region of Range 2.5–7 µm of the Optical Magnesium Fluoride (MgF₂) Ceramic Using the Hot‐Pressing Technique in a Vacuum Environment

Hieu

Thom

Thái

et al. 2020

Advances in Materials Science and Engineering

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This paper carries out an experimental study to enhance the quality of the characteristic transmittance curve in the infrared range of 2.5–7 µm of the optical magnesium fluoride (MgF2) ceramic. This work evaluates the effectiveness of using vacuum environment in the MgF2 ceramic hot-pressing technique by comparing the density and the quality of the transmittance characteristic curve of two types of specimens manufactured by the hot-pressing technique corresponding to open air and vacuum environment under the same technological parameters including temperature 650°C, time 30 min, and pressure 200 MPa. The results present that, in comparison with using the hot-pressing technique in the open air, when using the hot-pressing technique in a vacuum environment, the transmittance increases about 4–10%, the characteristic transmittance curve is smoother and has fewer peak points, and the wide of peak points are smaller. When hot-pressing in a vacuum environment, the temperature can be up to 750°C in order to obtain the magnesium fluoride (MgF2) ceramic with the highest quality of characteristic line in the infrared range of 2.5–7 µm. Seventeen specimens are manufactured to conduct the experimental study in order to figure out the optimal set of technological parameters (temperature T = 640.9°C, time t = 33.0 min, and pressure P=231.4 MPa) when hot-pressing in a vacuum environment by the experimental planning approach.

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“…The most mature medium wave infrared window materials used in missile are sapphire [5], magnesia aluminum spinel [6], MgF 2 [7], AlON [8] and so on. MgF 2 is the most mature infrared window material, but its hardness and thermal shock resistance is low.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Dispersed Y<sub>2</sub>O<sub>3</sub>-MgO Nanopowder from Stearate

Wang¹,

Sun²,

Yang

et al. 2018

SSP

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Dispersed Y2O3-MgO nanopowder was synthesized by calcining the stearate. XRD, TG-DTA, FT-IR, BET and FE-SEM were employed to analyze The formation mechanism of the precursor and the Y2O3-MgO nanopowder. Pure and dispersed Y2O3-MgO nanopowder with an average particle size of 40 nm was produced by calcining the precursor at 600 °C. The particle size increases to about 70 nm with the increase of the calcination temperature to 700 °C. In the preparation of Y2O3-MgO from stearate, no water medium is involved, thus capillarity force and bridging of adjacent particles by hydrogen bonds can be avoided, resulting in good dispersion of the particles. The dispersed Y2O3-MgO nanopowder prepared in this work has potential application in infrared transparent ceramic materials.

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Hot-pressing of bimodally distributed magnesium fluoride powder

Cited by 6 publications

References 15 publications

Tailor‐Made MgF₂‐Based Catalysts by Sol–Gel Synthesis

Tailor‐Made MgF₂‐Based Catalysts by Sol–Gel Synthesis

Enhancing the Quality of the Characteristic Transmittance Curve in the Infrared Region of Range 2.5–7 µm of the Optical Magnesium Fluoride (MgF₂) Ceramic Using the Hot‐Pressing Technique in a Vacuum Environment

Preparation of Dispersed Y<sub>2</sub>O<sub>3</sub>-MgO Nanopowder from Stearate

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Hot-pressing of bimodally distributed magnesium fluoride powder

Cited by 6 publications

References 15 publications

Tailor‐Made MgF2‐Based Catalysts by Sol–Gel Synthesis

Tailor‐Made MgF2‐Based Catalysts by Sol–Gel Synthesis

Enhancing the Quality of the Characteristic Transmittance Curve in the Infrared Region of Range 2.5–7 µm of the Optical Magnesium Fluoride (MgF2) Ceramic Using the Hot‐Pressing Technique in a Vacuum Environment

Preparation of Dispersed Y<sub>2</sub>O<sub>3</sub>-MgO Nanopowder from Stearate

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Product

Resources

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Tailor‐Made MgF₂‐Based Catalysts by Sol–Gel Synthesis

Tailor‐Made MgF₂‐Based Catalysts by Sol–Gel Synthesis

Enhancing the Quality of the Characteristic Transmittance Curve in the Infrared Region of Range 2.5–7 µm of the Optical Magnesium Fluoride (MgF₂) Ceramic Using the Hot‐Pressing Technique in a Vacuum Environment