Phase and Morphological Evaluation of Mechanically Activated Sintered YAG Powders

Öksüz, Keri̇m Emre; Apaydin, Fatih; Bozdağ, A. Enbiya; Çevik, Mehmet; Özer, Ali

doi:10.1016/j.mspro.2015.11.067

Cited by 4 publications

(3 citation statements)

References 6 publications

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“…The increasing amount of Y 2 O 3 also leads to the appearance of new phases, as mentioned before for the liquid phase formation, as seen in Fig. 3b, d and f. The grain boundaries got smoother by increasing Y amount, which may be attributed to Al-Y and Ca-Y-P phases existing between the matrix grains [10]. By glassy phase formation, the amount of interfering obstacles of grains decrease and sudden grain growth at relatively high temperature of 1600…”

Section: Micro-hardness and Relative Density Of Compositessupporting

confidence: 66%

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Effect of Yttria on the Phase Formation and Sintering of HA-Al₂O₃Biocomposites

Öksüz

Özer

2017

Acta Phys. Pol. A

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Hydroxyapatite is very-well known as the main component of hard tissues and, as such, it has attracted much attention by researchers in the recent decades. This study was aimed to present the characterization of Y2O3 doped 50 wt.% hydroxyapatite -50 wt.% Al2O3 composite materials fabricated at relatively high temperature of 1600• C. Hydroxyapatite powder was obtained from bovine bones via calcination and ball milling technique. Fine powders (≤ 1 µm) of hydroxyapatite/Al2O3 were admixed with 0.5 and 1 wt.% Y2O3 powders. Powder compacts were sintered at 1600• C for 4 h in air atmosphere. The field emission scanning electron microscopy, energy-dispersive spectroscopy and X-ray diffraction studies following the relative density measurements were conducted. Moreover, the microhardness was studied as the mechanical property of sintered samples. The effect of increasing Y2O3 content on surface morphology, elemental distribution and phase evaluation was investigated in hydroxyapatite/Al2O3 biocomposite materials. It was found that by increasing Y2O3 content, the relative density increased up to 98.8%, while the hardness increased to 863 HV (0.2) . The main phases, which were found, are Hibonite -CaO(Al2O3)6 and beta-tricalcium phosphate -Ca3(PO4)2, according to X-ray diffraction pattern.

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Section: Micro-hardness and Relative Density Of Compositessupporting

confidence: 66%

“…to increase their fracture toughness, incorporation of metallic materials, ceramic oxides [8][9][10] or fibers can be used. The reinforcement of HA matrices with ceramic particles revealed to have considerable potential for improving the mechanical properties [11].…”

Section: Introductionmentioning

confidence: 99%

Effect of Yttria on the Phase Formation and Sintering of HA-Al₂O₃Biocomposites

Öksüz

Özer

2017

Acta Phys. Pol. A

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“…3a and b). The intensities of peaks of Y and A phases go down and other peaks have disappeared [10]. After 3 h of planetary ball milling, the powders formed a high amount of Y-A phases, which is believed to turn into YAG and other deficient phases, after sintering cycle with the aid of SiO 2 .…”

Section: Resultsmentioning

confidence: 99%

High Energy Ball Milling of YAG Powders: Sintering Properties and Microstructural Evaluation

Özer

Kilic

2017

Acta Phys. Pol. A

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Outstanding properties of sintered ceramics due to lower sintering temperatures and smaller grain sizes are of much attention to many researchers. In this study, YAG phase was formed successfully with mechanical activation of powder mixtures by high energy ball milling of powders at different speeds. The powders were compacted and sintered at three different temperatures to evaluate the sintering density, phase formation and grain formation. It was found that increasing activation time, which agitates the powder mixing more accurately, has led to an increase in the relative density, as compared to non-activated samples, sintered at same temperatures. Up to 95% ot the theoretical density were reached, indicating the partial liquid phase formation of Y-A related phases. YAG phase formation and crystallite size were evaluated using XRD and Debye-Scherrer formula. The studies of grain size and surface morphology were conducted using SEM. Since the mechanical activation of ceramic powders occurs by fragmentation and crack propagation, by brittle fracture of powders, the main mechanism of reduction of sintering temperature can be concluded to be the decreasing grain size, as well as the increasing strain on fine powder grains.

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Cement and Clinker Production by Indirect Mechanosynthesis Process

Bouchenafa¹,

Hamzaoui²,

Florence³

et al. 2022

Construction Materials

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Global cement production has reached 3.9 billion tons. However, the clinkerization process, which is the basis of cement production, is responsible for an approximate annual global CO2 emission of 2 billion tons. As part of CEMBUREAU’s 5C strategy, the European cement industry aims to achieve carbon neutrality throughout the cement-concrete value chain by 2050. This article is a continuation of the previous article on the indirect mechanosynthesis clinkerization process, which combines mechanical activation (high-energy milling) and thermal treatment at lower temperatures (from 900 °C) than those used for conventional clinkerization to produce clinker. With this process, we manufactured cement and clinker from industrial and laboratory raw mixes, which had to be rectified by adding kaolinite in compliance with the different cement indicators (LSF, SM, AM). The cement and clinker produced by indirect mechanosynthesis (15 min of mechanical activation and heat treatment 900 °C or 1200 °C) were characterized. In order to test the hydraulic properties of the cement produced, cement pastes were made. Mechanical and structural studies were carried out (between 70 and 90% of C2S). Mechanical tests revealed for 7 curing days, the values of 3.60 and 7.60 MPa at 900 °C and 1200 °C, respectively, in comparison to commercial cements CEM I and CEM III (23.03 and 19.14 MPa).

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Phase and Morphological Evaluation of Mechanically Activated Sintered YAG Powders

Cited by 4 publications

References 6 publications

Effect of Yttria on the Phase Formation and Sintering of HA-Al₂O₃Biocomposites

Effect of Yttria on the Phase Formation and Sintering of HA-Al₂O₃Biocomposites

High Energy Ball Milling of YAG Powders: Sintering Properties and Microstructural Evaluation

Cement and Clinker Production by Indirect Mechanosynthesis Process

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Phase and Morphological Evaluation of Mechanically Activated Sintered YAG Powders

Cited by 4 publications

References 6 publications

Effect of Yttria on the Phase Formation and Sintering of HA-Al2O3Biocomposites

Effect of Yttria on the Phase Formation and Sintering of HA-Al2O3Biocomposites

High Energy Ball Milling of YAG Powders: Sintering Properties and Microstructural Evaluation

Cement and Clinker Production by Indirect Mechanosynthesis Process

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Product

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Effect of Yttria on the Phase Formation and Sintering of HA-Al₂O₃Biocomposites

Effect of Yttria on the Phase Formation and Sintering of HA-Al₂O₃Biocomposites