ALON optical ceramic transparencies for window, dome, and transparent armor applications

Goldman, Lee M.; Twedt, Rich; Balasubramanian, Sreeram; Sastri, Suri

doi:10.1117/12.886122

Cited by 33 publications

(15 citation statements)

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“…Transparent aluminum oxynitride ceramic (γ‐AlON) is one of the most useful ceramic materials that attracts broadening interests in many fields due to its excellent physical and chemical properties. Its superior hardness and strength, high transparency, and high corrosion‐resistance properties make γ‐AlON a good candidate for transparent armors, infrared window, domes, and phosphors . Traditionally, transparent AlON ceramic is prepared by the following procedures: synthesizing and milling of powder, then shaping of green body and followed by the sintering of the ceramic.…”

Section: Introductionmentioning

confidence: 99%

Planetary ball‐milling of AlON powder for highly transparent ceramics

Huang

Guo

et al. 2018

J Am Ceram Soc

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A detailed investigation of planetary ball-milling for coarsened AlON powder was carried out. Our results showed that the weight ratios of milling ball-to-powder, the revolution rate and the planetary ball-milling time have significant impacts on the microscopic morphology, particle size distribution and average particle size of powder. The process and mechanism were analyzed, and the outcome of our study can be used to optimize the complicated planetary ball-milling method by controlling the planetary ball-milling time or adjusting the revolution rate at the final stage of planetary ball-milling. Sequentially, using fine and uniform AlON powder by optimized planetary ball-milling with an average particle size below 300 nm and excellent sintering properties, highly transparent AlON ceramic with an in-line transmittance of 84% at 2000 nm was successfully prepared through pressureless sintering at 1880°C for 6 hours using the elaborative treated powder synthesized from carbothermal nitridation method.

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Section: Introductionmentioning

confidence: 99%

Planetary ball‐milling of AlON powder for highly transparent ceramics

Huang

Guo

et al. 2018

J Am Ceram Soc

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“…ALON ceramics is used for infrared and visible windows, abrasives and armor materials, optical coatings [3] and optoelectronic applications [4]. This is because of excellent properties, such as high strength and high hardness [5][6][7], transparency for wavelength from ultraviolet (UV) to mid-infrared (MID-IR) [2,7,8] and high temperature resistance (melting temperature of 2150°C) and corrosion resistance [9].…”

Section: Introductionmentioning

confidence: 99%

Influence of substrate temperature and gas pressure on aluminum oxynitride coatings obtained by pulsed laser deposition

Piwowarczyk

Jędrzejewski

Baranowska

2017

Materials Science-Poland

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The paper presents results of the investigation on the influence of deposition parameters, such as substrate temperature, total gas pressure and reactive gas composition on the structure, chemical composition and mechanical properties of aluminum oxynitride coatings obtained by pulsed laser deposition (PLD) method. Selection of process parameter ranges, which could be promising for aluminum oxynitride (ALON) coatings deposition, was the main objective of the work. Two series of experiments were carried out with varied pressure and temperature. It was found that from the chemical composition viewpoint, the most promising are atmospheres containing 20 % to 40 % oxygen. The nitrogen to oxygen ratios in the coatings can be controlled by increasing the total pressure or substrate temperature. However, increasing the pressure has a negative effect on the O + N:Al ratio, mechanical properties and quality of the coatings. The influence of temperature is much less drastic and more controllable. Increasing the deposition temperature is much more beneficial since it improves the mechanical properties and can compensate to some extent the negative effect of the total pressure. From the coating quality viewpoint, it is possible to establish an optimum temperature range for which the coatings are characterized by a compact structure and a limited number of droplets.

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“…In this investigation, the focus is on cubic, optical isotropic oxynitride ceramics. These oxynitride ceramics possess all the promising properties of a host for advanced scintillators including high mechanical strength, good stability in air and moisture, high sinterability, and lower cost . Traditional scintillators are based on either oxides or halide systems .…”

Section: Introductionmentioning

confidence: 99%

“…Cubic aluminum oxynitride (AlON) has been studied periodically since the 1960s, however, most of the research has been aimed at IR radome and transparent armor applications . AlON has a great potential as a transparent ceramic host for scintillator applications due to its good optical, non‐hygroscopic properties and wide band gap.…”

Section: Introductionmentioning

confidence: 99%

Processing of Transparent Polycrystalline AlON:Ce³⁺ Scintillators

et al. 2015

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A new polycrystalline ceramic scintillator is reported for potential use in radiation detection and medical imaging applications. The goal was to develop cerium-activated aluminum oxynitride (AlON:Ce 3+ ) ceramics, which can be produced using ceramic processes in comparison to the high-cost, low-yield single-crystal growth technique. A phase pure AlON:Ce 3+ powder with cubic symmetry was successfully synthesized at high temperature under a reducing atmosphere to convert Ce 4+ to Ce 3+ in the solid solution. Two different activator concentrations (0.5 and 1.0 mol%) were explored. Fully dense and transparent AlON: Ce 3+ ceramics were produced by a liquid-phase-assisted pressureless sintering. The crystal field splitting around the Ce 3+ activator in the AlON was comparable to the splitting induced by Br -and the Cl -ligands, which produced an emission spectrum perfectly matching the maximum quantum efficiency range of the photomultiplier tube for radiation detection. Both optical excitation and radiation ionizations in AlON:Ce 3+ were demonstrated. Challenges and mechanisms related to the radioluminescence efficiency are discussed.

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ALON optical ceramic transparencies for window, dome, and transparent armor applications

Cited by 33 publications

References 0 publications

Planetary ball‐milling of AlON powder for highly transparent ceramics

Planetary ball‐milling of AlON powder for highly transparent ceramics

Influence of substrate temperature and gas pressure on aluminum oxynitride coatings obtained by pulsed laser deposition

Processing of Transparent Polycrystalline AlON:Ce³⁺ Scintillators

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ALON optical ceramic transparencies for window, dome, and transparent armor applications

Cited by 33 publications

References 0 publications

Planetary ball‐milling of AlON powder for highly transparent ceramics

Planetary ball‐milling of AlON powder for highly transparent ceramics

Influence of substrate temperature and gas pressure on aluminum oxynitride coatings obtained by pulsed laser deposition

Processing of Transparent Polycrystalline AlON:Ce3+ Scintillators

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Product

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Processing of Transparent Polycrystalline AlON:Ce³⁺ Scintillators