The Experts below are selected from a list of 14010 Experts worldwide ranked by ideXlab platform
Yong Zhou - One of the best experts on this subject based on the ideXlab platform.
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formation of tib2 tin nanocomposite powder by high energy ball milling and Subsequent Heat Treatment
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2002Co-Authors: Yong ZhouAbstract:Abstract TiB 2 /TiN nanocomposite powder was fabricated by high energy ball milling and Subsequent Heat Treatment. The microstructure development of the powder mixtures was monitored by X-ray diffraction, differential scanning calorimeter, scanning electron microscopy and transmission electron microscopy. It was found that TiN formed within 30 h of milling. After 40 h of milling, the resulting powder mixture was composed of a small amount of nanosized TiN particles, nanocrystalline Ti and amorphous phase. The nanocrystalline Ti and amorphous phase were transformed into TiN and TiB 2 after Subsequent Heat Treatment.
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formation of tib2 tin ti cxn1 x nanocomposite powder via high energy ball milling and Subsequent Heat Treatment
Journal of Alloys and Compounds, 2002Co-Authors: Yong ZhouAbstract:Abstract TiB 2 /TiN/Ti (C x N 1− x ) nanocomposite powder was fabricated by high-energy ball milling and Subsequent Heat Treatment. The microstructure development of powder mixtures was monitored by X-ray diffraction and transmission electron microscopy. It was found that TiN and TiC formed within 10 h of milling. After 30 h of milling, the resulting powder mixtures were mainly composed of nanocrystalline Ti, TiN, TiC and TiB 2 . The as-milled powder was transformed into Ti (C x N 1− x ), TiN and TiB 2 after Subsequent Heat Treatment at 1300°C. During annealing, TiC reacted with TiN, and Ti (C x N 1− x ) was thus obtained.
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Formation of TiB2/TiN/Ti (CxN1-x) nanocomposite powder via high-energy ball milling and Subsequent Heat Treatment
Journal of Alloys and Compounds, 2002Co-Authors: Yong ZhouAbstract:Abstract TiB 2 /TiN/Ti (C x N 1− x ) nanocomposite powder was fabricated by high-energy ball milling and Subsequent Heat Treatment. The microstructure development of powder mixtures was monitored by X-ray diffraction and transmission electron microscopy. It was found that TiN and TiC formed within 10 h of milling. After 30 h of milling, the resulting powder mixtures were mainly composed of nanocrystalline Ti, TiN, TiC and TiB 2 . The as-milled powder was transformed into Ti (C x N 1− x ), TiN and TiB 2 after Subsequent Heat Treatment at 1300°C. During annealing, TiC reacted with TiN, and Ti (C x N 1− x ) was thus obtained.
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Formation of TiB2/TiN nanocomposite powder by high energy ball milling and Subsequent Heat Treatment
Materials Science and Engineering: A, 2002Co-Authors: Yong ZhouAbstract:Abstract TiB 2 /TiN nanocomposite powder was fabricated by high energy ball milling and Subsequent Heat Treatment. The microstructure development of the powder mixtures was monitored by X-ray diffraction, differential scanning calorimeter, scanning electron microscopy and transmission electron microscopy. It was found that TiN formed within 30 h of milling. After 40 h of milling, the resulting powder mixture was composed of a small amount of nanosized TiN particles, nanocrystalline Ti and amorphous phase. The nanocrystalline Ti and amorphous phase were transformed into TiN and TiB 2 after Subsequent Heat Treatment.
Wei-kang Huang - One of the best experts on this subject based on the ideXlab platform.
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highly visible light absorbing black tio2 nanocrystals synthesized by sol gel method and Subsequent Heat Treatment in low partial pressure h2
Journal of The Taiwan Institute of Chemical Engineers, 2016Co-Authors: I-chun Chang, Kai-chi Hsiao, Wei-kang HuangAbstract:Abstract We present here a novel method for producing highly visible-light absorbing black TiO2 nanocrystals by combining sol–gel synthesis and Subsequent Heat Treatment in low partial pressure H2. The synthesized black TiO2 nanocrystals with trivalent titanium, oxygen vacancies and structural defects show a significantly lowered optical bandgap in reference to white TiO2. Photodegradation of methyl orange under visible light irradiation indicates the synthesized black TiO2 is superior to the commercial TiO2-P25. The developed process is simple, cost-effective, safe and allows producing a series of visible spectrum active catalysts without the need for metal doping or decoration.
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Highly visible-light absorbing black TiO2 nanocrystals synthesized by sol–gel method and Subsequent Heat Treatment in low partial pressure H2
Journal of the Taiwan Institute of Chemical Engineers, 2016Co-Authors: I-chun Chang, Kai-chi Hsiao, Wei-kang HuangAbstract:Abstract We present here a novel method for producing highly visible-light absorbing black TiO2 nanocrystals by combining sol–gel synthesis and Subsequent Heat Treatment in low partial pressure H2. The synthesized black TiO2 nanocrystals with trivalent titanium, oxygen vacancies and structural defects show a significantly lowered optical bandgap in reference to white TiO2. Photodegradation of methyl orange under visible light irradiation indicates the synthesized black TiO2 is superior to the commercial TiO2-P25. The developed process is simple, cost-effective, safe and allows producing a series of visible spectrum active catalysts without the need for metal doping or decoration.
R. Beygi - One of the best experts on this subject based on the ideXlab platform.
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fabrication of nial al2o3 wc nanocomposite by mechanical alloying and Subsequent Heat Treatment
Ceramics International, 2019Co-Authors: A. Goudarzi, Zarezadeh M Mehrizi, A. Lalianpour, R. BeygiAbstract:Abstract In this study, NiAl–Al2O3-WC nanocomposite has been synthesized from the Al–NiO–W–C powder mixture by mechanical alloying and Subsequent Heat Treatment. Phase development and structural changes were studied by X-ray diffraction technique, field-emission gun scanning electron microscopy, and transmission electron microscopy. XRD results showed that NiO was disappeared after 20 h milling and NiAl and W2C phases were formed. By the increase of milling time, no phase development was observed. So for access to desired compounds, 40 h milled powder thermally treated at 1200 °C for 3 h, and XRD and TEM results confirmed the formation of NiAl-WC-Al2O3 nanocomposite.
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Fabrication of NiAl–Al2O3-WC nanocomposite by mechanical alloying and Subsequent Heat Treatment
Ceramics International, 2019Co-Authors: A. Goudarzi, M. Zarezadeh Mehrizi, A. Lalianpour, R. BeygiAbstract:Abstract In this study, NiAl–Al2O3-WC nanocomposite has been synthesized from the Al–NiO–W–C powder mixture by mechanical alloying and Subsequent Heat Treatment. Phase development and structural changes were studied by X-ray diffraction technique, field-emission gun scanning electron microscopy, and transmission electron microscopy. XRD results showed that NiO was disappeared after 20 h milling and NiAl and W2C phases were formed. By the increase of milling time, no phase development was observed. So for access to desired compounds, 40 h milled powder thermally treated at 1200 °C for 3 h, and XRD and TEM results confirmed the formation of NiAl-WC-Al2O3 nanocomposite.
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synthesis of al tic al2o3 nanocomposite by mechanical alloying and Subsequent Heat Treatment
Ceramics International, 2016Co-Authors: Zarezadeh M Mehrizi, R. Beygi, Gh. EisaabadiAbstract:Abstract In this study, Al/TiC–Al 2 O 3 nanocomposite was synthesized via mechanical alloying and Heat Treatment. Phase development and structural changes were studied by X-ray diffraction technique and field-emission gun scanning electron microscopy. The results showed that the phase evolutions during mechanical alloying were strongly dependent on milling time until 20 h by formation of Al 3 Ti and Al 2 O 3 . After that, by increasing milling time, no new phases formed. Heat Treatment of 60 h milled powder showed that no new phases (especially TiC) were found after annealing at 500 °C. But increasing temperature to 1000 °C caused the Al 3 Ti and TiO 2 peaks disappeared and TiC peaks emerged. These results confirmed that the formation of TiC is not feasible in an Al–TiO 2 –C system with excess Al by mechanical alloying.
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Synthesis of Al/TiC–Al2O3 nanocomposite by mechanical alloying and Subsequent Heat Treatment
Ceramics International, 2016Co-Authors: M. Zarezadeh Mehrizi, R. Beygi, Gh. EisaabadiAbstract:Abstract In this study, Al/TiC–Al 2 O 3 nanocomposite was synthesized via mechanical alloying and Heat Treatment. Phase development and structural changes were studied by X-ray diffraction technique and field-emission gun scanning electron microscopy. The results showed that the phase evolutions during mechanical alloying were strongly dependent on milling time until 20 h by formation of Al 3 Ti and Al 2 O 3 . After that, by increasing milling time, no new phases formed. Heat Treatment of 60 h milled powder showed that no new phases (especially TiC) were found after annealing at 500 °C. But increasing temperature to 1000 °C caused the Al 3 Ti and TiO 2 peaks disappeared and TiC peaks emerged. These results confirmed that the formation of TiC is not feasible in an Al–TiO 2 –C system with excess Al by mechanical alloying.
Morteza Shamanian - One of the best experts on this subject based on the ideXlab platform.
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synthesis of cowsi wsi2 nanocomposite by mechanical alloying and Subsequent Heat Treatment
Ceramics International, 2014Co-Authors: Zarezadeh M Mehrizi, Morteza Shamanian, A SaidiAbstract:In this study, systematic evaluations were performed on the synthesis of CoWSi–WSi2 nanocomposite by mechanical alloying and Subsequent Heat Treatment. In this regard, 25 mol% Co, 35 mol% W, and 40 mol% Si powder mixture was milled for different durations. Then, the mechanically alloyed powders were Heat treated at 1000 °C for 1 h. The phase transformations and structural evolutions of the powders after various milling durations and Heat Treatment were investigated by X-ray diffraction as well as scanning and transmission electron microscopy. The results showed that the phase evolutions during mechanical alloying and Subsequent Heat Treatment were strongly dependent on milling time. After 20 h milling, a Co(ss)–WSi2 nanocomposite was formed. Increasing milling time to 50 h caused the formation of (Co,W,Si) solid solution, WSi2 and CoWSi phases. After Heat Treatment of 3 h ball milled powders, no new phases were detected. On the other hand, Heat Treatment of 5 h, 20 h and 30 h mechanically alloyed powders led to the formation of Co(ss)–WSi2–CoWSi–W5Si3. This means that there was a critical milling time (5 h) for the formation of WSi2 and CoWSi phases after Heat Treatment. Before this milling time, no new phases were formed, but after this time, WSi2 and CoWSi could be formed.
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Synthesis of CoWSi–WSi2 nanocomposite by mechanical alloying and Subsequent Heat Treatment
Ceramics International, 2014Co-Authors: M. Zarezadeh Mehrizi, Morteza Shamanian, A SaidiAbstract:In this study, systematic evaluations were performed on the synthesis of CoWSi–WSi2 nanocomposite by mechanical alloying and Subsequent Heat Treatment. In this regard, 25 mol% Co, 35 mol% W, and 40 mol% Si powder mixture was milled for different durations. Then, the mechanically alloyed powders were Heat treated at 1000 °C for 1 h. The phase transformations and structural evolutions of the powders after various milling durations and Heat Treatment were investigated by X-ray diffraction as well as scanning and transmission electron microscopy. The results showed that the phase evolutions during mechanical alloying and Subsequent Heat Treatment were strongly dependent on milling time. After 20 h milling, a Co(ss)–WSi2 nanocomposite was formed. Increasing milling time to 50 h caused the formation of (Co,W,Si) solid solution, WSi2 and CoWSi phases. After Heat Treatment of 3 h ball milled powders, no new phases were detected. On the other hand, Heat Treatment of 5 h, 20 h and 30 h mechanically alloyed powders led to the formation of Co(ss)–WSi2–CoWSi–W5Si3. This means that there was a critical milling time (5 h) for the formation of WSi2 and CoWSi phases after Heat Treatment. Before this milling time, no new phases were formed, but after this time, WSi2 and CoWSi could be formed.
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synthesis of α mo mo5sib2 mo3si nanocomposite powders by two step mechanical alloying and Subsequent Heat Treatment
Journal of Alloys and Compounds, 2011Co-Authors: Amir Reza Abbasi, Morteza ShamanianAbstract:Abstract A two-step mechanical alloying process followed by Heat Treatment was developed as a novel approach for fabrication of Mo–12.5 mol%Si–25 mol%B nanocomposite powders. In this regard, a Si–43.62 wt.% B powder mixture was milled for 20 h. Then, Mo was added to the mechanically alloyed Si–B powders in order to achieve Mo–12.5 mol%Si–25 mol%B powder. This powder mixture was further milled for 2,5,10 and 20 h. All of the milled powders were annealed at 1100 °C for 1 h. After first step of milling, a nanocomposite structure composed of boron particles embedded in Si matrix was formed. On the other hand, an α-Mo/MoSi 2 nanocomposite was produced after second step while no ternary phases between Mo, Si and B were formed. At this stage, the Subsequent annealing led to formation of α-Mo and Mo 5 SiB 2 as major phases. The phase evolutions during Heat Treatment of powders can be affected by milling conditions. It should be mentioned that the desirable intermetallic phases were not formed during Heat Treatment of unmilled powders. On the other hand, α-Mo–Mo 5 SiB 2 –Mo 3 Si nanocomposites were formed after annealing of powders milled for 22 h. With increasing milling time (at the second step), the formation of Mo 3 Si during Subsequent Heat Treatment was disturbed. Here, an α-Mo–Mo 5 SiB 2 –MoSi 2 nanocomposite was formed after annealing of 30 and 40 h milled powders.
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Synthesis of Mo5SiB2 based nanocomposites by mechanical alloying and Subsequent Heat Treatment
Materials Science and Engineering: A, 2011Co-Authors: Amir Reza Abbasi, Morteza ShamanianAbstract:Abstract In this study, systematic investigations were conducted on the synthesis of Mo5SiB2-based alloy by mechanical alloying and Subsequent Heat Treatment. In this regard, Mo–12.5 mol% Si–25 mol% B powder mixture was milled for different times. Then, the mechanically alloyed powders were Heat treated at 1373 K for 1 h. The phase transitions and microstructural evolutions of powder particles during mechanical alloying and Heat Treatment were studied by X-ray diffractometry and scanning electron microscopy. The results showed that the phase evolutions during mechanical alloying and Subsequent Heat Treatment are strongly dependent on milling time. After 10 h of milling, a Mo solid solution was formed, but, no intermetallic phases were detected at this stage. However, an α-Mo–Mo5SiB2 nanocomposite was formed after 20 h of milling. After Heat Treatment of 5 h mechanically alloyed powders, small amounts of MoB and Mo2B were detected and α-Mo–MoB–Mo2B composite was produced. On the other hand, Heat Treatment of 10 h and 20 h mechanically alloyed powders led to the formation of an α-Mo–Mo5SiB2–MoSi2–Mo3Si composite. At this point, there is a critical milling time (10 h) for the formation of Mo5SiB2 phase after Heat Treatment wherein below that time, boride phase and after that time, Mo5SiB2 phase are formed. In the case of 20 h mechanically alloyed powders, by increasing Heat Treatment time, not only the quantity of α-Mo was reduced and the quantity of Mo5SiB2 was increased, but also new boride phases were formed. Finally, after 5 h Heat Treatment, the Mo phase completely disappeared and a Mo5SiB2-based composite was completely formed.
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Synthesis of α-Mo–Mo5SiB2–Mo3Si nanocomposite powders by two-step mechanical alloying and Subsequent Heat Treatment
Journal of Alloys and Compounds, 2011Co-Authors: Amir Reza Abbasi, Morteza ShamanianAbstract:Abstract A two-step mechanical alloying process followed by Heat Treatment was developed as a novel approach for fabrication of Mo–12.5 mol%Si–25 mol%B nanocomposite powders. In this regard, a Si–43.62 wt.% B powder mixture was milled for 20 h. Then, Mo was added to the mechanically alloyed Si–B powders in order to achieve Mo–12.5 mol%Si–25 mol%B powder. This powder mixture was further milled for 2,5,10 and 20 h. All of the milled powders were annealed at 1100 °C for 1 h. After first step of milling, a nanocomposite structure composed of boron particles embedded in Si matrix was formed. On the other hand, an α-Mo/MoSi 2 nanocomposite was produced after second step while no ternary phases between Mo, Si and B were formed. At this stage, the Subsequent annealing led to formation of α-Mo and Mo 5 SiB 2 as major phases. The phase evolutions during Heat Treatment of powders can be affected by milling conditions. It should be mentioned that the desirable intermetallic phases were not formed during Heat Treatment of unmilled powders. On the other hand, α-Mo–Mo 5 SiB 2 –Mo 3 Si nanocomposites were formed after annealing of powders milled for 22 h. With increasing milling time (at the second step), the formation of Mo 3 Si during Subsequent Heat Treatment was disturbed. Here, an α-Mo–Mo 5 SiB 2 –MoSi 2 nanocomposite was formed after annealing of 30 and 40 h milled powders.
I-chun Chang - One of the best experts on this subject based on the ideXlab platform.
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highly visible light absorbing black tio2 nanocrystals synthesized by sol gel method and Subsequent Heat Treatment in low partial pressure h2
Journal of The Taiwan Institute of Chemical Engineers, 2016Co-Authors: I-chun Chang, Kai-chi Hsiao, Wei-kang HuangAbstract:Abstract We present here a novel method for producing highly visible-light absorbing black TiO2 nanocrystals by combining sol–gel synthesis and Subsequent Heat Treatment in low partial pressure H2. The synthesized black TiO2 nanocrystals with trivalent titanium, oxygen vacancies and structural defects show a significantly lowered optical bandgap in reference to white TiO2. Photodegradation of methyl orange under visible light irradiation indicates the synthesized black TiO2 is superior to the commercial TiO2-P25. The developed process is simple, cost-effective, safe and allows producing a series of visible spectrum active catalysts without the need for metal doping or decoration.
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Highly visible-light absorbing black TiO2 nanocrystals synthesized by sol–gel method and Subsequent Heat Treatment in low partial pressure H2
Journal of the Taiwan Institute of Chemical Engineers, 2016Co-Authors: I-chun Chang, Kai-chi Hsiao, Wei-kang HuangAbstract:Abstract We present here a novel method for producing highly visible-light absorbing black TiO2 nanocrystals by combining sol–gel synthesis and Subsequent Heat Treatment in low partial pressure H2. The synthesized black TiO2 nanocrystals with trivalent titanium, oxygen vacancies and structural defects show a significantly lowered optical bandgap in reference to white TiO2. Photodegradation of methyl orange under visible light irradiation indicates the synthesized black TiO2 is superior to the commercial TiO2-P25. The developed process is simple, cost-effective, safe and allows producing a series of visible spectrum active catalysts without the need for metal doping or decoration.
