A fast pressureless sintering method for transparent AlON ceramics by using a bimodal particle size distribution powder

Shan, Yingchun; Xu, Jiwen; Guang, Wang; Sun, Xiannian; Liu, Guanghua; Xu, Jiujun; Li, Jiangtao

doi:10.1016/j.ceramint.2014.11.084

Cited by 62 publications

(34 citation statements)

References 21 publications

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“…Over the next several years, other researchers confirmed that a spinel-type phase named aluminum oxynitride (AlON) indeed exists in this system [11][12][13][14]. As a new ceramic material, AlON offers researchers additional options in oxide-non-oxide systems [15][16][17]. It has great potential as a carbon-free, environmentally friendly refractory.…”

Section: Introductionmentioning

confidence: 85%

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In situ reaction mechanism of MgAlON in Al–Al2O3–MgO composites at 1700°C under flowing N2

Tong

Yan

et al. 2017

Int J Miner Metall Mater

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Abstract:The Al-Al 2 O 3 -MgO composites with added aluminum contents of approximately 0wt%, 5wt%, and 10wt%, named as M 1 , M 2 , and M 3 , respectively, were prepared at 1700°C for 5 h under a flowing N 2 atmosphere using the reaction sintering method. After sintering, the Al-Al 2 O 3 -MgO composites were characterized and analyzed by X-ray diffraction, scanning electron microscopy, and energy-dispersive X-ray spectroscopy. The results show that specimen M 1 was composed of MgO and MgAl 2 O 4 . Compared with specimen M 1 , specimens M 2 and M 3 possessed MgAlON, and its production increased with increasing aluminum addition. Under an N 2 atmosphere, MgO, Al 2 O 3 , and Al in the matrix of specimens M 2 and M 3 reacted to form MgAlON and AlN-polytypoids, which combined the particles and the matrix together and imparted the Al-Al 2 O 3 -MgO composites with a dense structure. The mechanism of MgAlON synthesis is described as follows. Under an N 2 atmosphere, the partial pressure of oxygen is quite low; thus, when the Al-Al 2 O 3 -MgO composites were soaked at 580°C for an extended period, aluminum metal was transformed into AlN. With increasing temperature, Al 2 O 3 diffused into AlN crystal lattices and formed AlN-polytypoids; however, MgO reacted with Al 2 O 3 to form MgAl 2 O 4 . When the temperature was greater than (1640 ± 10)°C, AlN diffused into Al 2 O 3 and formed spinel-structured AlON. In situ MgAlON was acquired through a solid-solution reaction between AlON and MgAl 2 O 4 at high temperatures because of their similar spinel structures.

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Section: Introductionmentioning

confidence: 85%

“…It has great potential as a carbon-free, environmentally friendly refractory. AlON has two crystal structures [15,18]: wurtzite-structured AlN-polytypoids and spinel-structured AlON. However, AlON is only stable at (1640 ± 10)°C or higher temperatures and under a certain oxygen partial pressure and nitrogen partial pressure [19].…”

Section: Introductionmentioning

confidence: 99%

In situ reaction mechanism of MgAlON in Al–Al2O3–MgO composites at 1700°C under flowing N2

Tong

Yan

et al. 2017

Int J Miner Metall Mater

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“…The density increments vary between 0.7 % and 1.8 %; these values are of great importance for the final optical properties[10,41].…”

mentioning

confidence: 99%

Er:YAG polycrystalline ceramics: The effects of the particle size distribution on the structural and optical properties

Moreira¹,

Ponce²,

Posada³

et al. 2015

Ceramics International

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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%

“…There is an extensive research literature available on the production of ALON powders and its subsequent processing [9][10][11][12]. However, these techniques require the use of high * E-mail: Joanna.Piwowarczyk@zut.edu.pl temperatures (above 1600°C), long production times and chemical additives.…”

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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A fast pressureless sintering method for transparent AlON ceramics by using a bimodal particle size distribution powder

Cited by 62 publications

References 21 publications

In situ reaction mechanism of MgAlON in Al–Al2O3–MgO composites at 1700°C under flowing N2

In situ reaction mechanism of MgAlON in Al–Al2O3–MgO composites at 1700°C under flowing N2

Er:YAG polycrystalline ceramics: The effects of the particle size distribution on the structural and optical properties

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

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