Aluminum Borate Whiskers Growing by Compensation of TiB2

2006 ◽  
Vol 313 ◽  
pp. 115-120
Author(s):  
Dong Ming Zhang ◽  
You Jun Li ◽  
Lian Meng Zhang ◽  
Jing Kun Guo
Keyword(s):  
Phase Transformation ◽  
Transformation Process ◽  
Aluminum Borate ◽  
Phase Transformation Process ◽  
Higher Temperature ◽  
Lower Temperature

Aluminum borate whiskers with TiB2 as borate source were prepared in this paper. The phase transformation process was analyzed by XRD and TG-DSC. The results indicate that TiB2 was decomposed into TiO2 and B2O3 in the calcining process in the active [O] atmosphere. 2Al2O3.B2O3 was formed in the lower temperature with reaction of Al2O3 and B2O3, while 9Al2O3.2B2O3 whiskers were grown by compensation of 2Al2O3.B2O3 at higher temperature (above 1050oC)

High efficient phosphate removal by lanthanum modified hydroxyapatite with a phase transformation process

2021 ◽  
Vol 216 ◽  
pp. 211-219
Author(s):  
Zhongjun Li ◽  
Qiwu Wei ◽  
Guisheng Zeng ◽  
Zhong Ren ◽  
Baojin Huang
Keyword(s):  
Phase Transformation ◽  
Transformation Process ◽  
Phosphate Removal ◽  
Phase Transformation Process ◽  
High Efficient

Removal and recovery of Pb from wastewater through a reversible phase transformation process between nano-flower-like Mg(OH)2 and soluble Mg(HCO3)2

2019 ◽  
Vol 6 (2) ◽  
pp. 467-477 ◽  
Author(s):  
Xueming Liu ◽  
Kainan Song ◽  
Weizhen Liu ◽  
Yuecheng Xiong ◽  
Yunyun Xu ◽  
...  
Keyword(s):  
Phase Transformation ◽  
Transformation Process ◽  
New Technique ◽  
Phase Transformation Process ◽  
A New Technique ◽  
Reversible Phase ◽  
Removal And Recovery

This study investigated the effectiveness of a new technique for recovering Pb as highly pure PbCO3 nanoparticles from wastewater by using a nano-Mg(OH)2 adsorbent.

scholarly journals Acid–base sites synergistic catalysis over Mg–Zr–Al mixed metal oxide toward synthesis of diethyl carbonate

RSC Advances ◽  
2018 ◽  
Vol 8 (9) ◽  
pp. 4695-4702 ◽  
Author(s):  
Tingting Yan ◽  
Weihan Bing ◽  
Ming Xu ◽  
Yinwen Li ◽  
Yusen Yang ◽  
...  
Keyword(s):  
Phase Transformation ◽  
Catalytic Performance ◽  
Transformation Process ◽  
Mixed Metal Oxide ◽  
Diethyl Carbonate ◽  
Mixed Metal Oxides ◽  
Acid Base ◽  
Phase Transformation Process ◽  
Mixed Metal ◽  
Synergistic Catalysis

Mg/Zr/Al mixed metal oxides were prepared via a facile phase transformation process of hydrotalcite precursors, which showed acid–base sites synergistic catalytic performance toward the synthesis of diethyl carbonate from ethanol and urea.

Phase transformation process of Tb2O3 at elevated temperature

2019 ◽  
Vol 171 ◽  
pp. 108-111 ◽  
Author(s):  
Junyu Zhang ◽  
Hetuo Chen ◽  
Junping Wang ◽  
Dewen Wang ◽  
Dan Han ◽  
...  
Keyword(s):  
Phase Transformation ◽  
Elevated Temperature ◽  
Transformation Process ◽  
Phase Transformation Process

Phase Transformation during the Hot Pressing of WC-40vol.% Al2O3 Composites

2012 ◽  
Vol 152-154 ◽  
pp. 260-265 ◽  
Author(s):  
Hai Xia Qu ◽  
Shi Gen Zhu
Keyword(s):  
Phase Transformation ◽  
Hot Pressing ◽  
Metal Particle ◽  
High Energy ◽  
Transformation Process ◽  
Matrix Composites ◽  
Pressing Temperature ◽  
Phase Transformation Process ◽  
Vacuum Degree ◽  
Energy Ball

WC matrix composites toughened by commercial Al2O3composed of AlOOH, χ-Al2O3and amorphous Al2O3were prepared by high energy ball milling and then hot pressed at 769°C, 984°C, 1100°C, 1540°C for 90min, respectively, to investigate the phase transformation process. Microstructure and mechanical properties of WC-40vol.%Al2O3composites were studied as well. The results showed that, with the increasing hot pressing temperature, the commercial Al2O3 transformed to α-Al2O3completely through γ-Al2O3. WC could be oxidized and decarburized to W, C and W2C at low temperature when the vacuum degree was very low. The existence of W in the composites sintered at 1540°C for 90min could contribute to a metal particle toughening effect to the composites, resulting in the achievement of an excellent fracture toughness of 10.43MPa•m1/2, combining a Vickers hardness of 18.65GPa with a relative density of 97.98% for WC-40vol.%Al2O3composites.

A new polymorph of Cd3B2O6: synthesis, crystal structure and phase transformation

RSC Advances ◽  
2014 ◽  
Vol 4 (25) ◽  
pp. 13195-13200 ◽  
Author(s):  
Xingwen Zhang ◽  
Hongwei Yu ◽  
Hongping Wu ◽  
Shilie Pan ◽  
Anqing Jiao ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Phase Transformation ◽  
High Temperature ◽  
Transformation Process ◽  
High Temperature Phase ◽  
Temperature Phase ◽  
Phase Transformation Process

A new high-temperature phase of Cd3B2O6 (β-Cd3B2O6) has been discovered and the phase transformation process between α- and β-Cd3B2O6 was investigated.

Electropulsing-Induced α to β Phase Transformation of Ti–6Al–4V

2019 ◽  
Vol 141 (11) ◽  
Author(s):  
Jihui Huang ◽  
Zhutian Xu ◽  
Yujun Deng ◽  
Linfa Peng
Keyword(s):  
Phase Transformation ◽  
Transformation Process ◽  
Transformation Rate ◽  
Avrami Model ◽  
Β Phase ◽  
Specific Effects ◽  
Heating Treatment ◽  
Transus Temperature ◽  
Lower Temperature ◽  
Electropulsing Treatment

Abstract Electrically assisted forming (EAF) has been increasingly utilized as an effective auxiliary processing technology to improve the formability of hard-to-deform metals. Previous works have revealed that the phase transformation of titanium alloys subjected to electropulsing treatment (EPT) can occur at a lower temperature and in a remarkably shorter time compared with those subjected to the traditional heating treatment (THT). However, an in-depth experimental verification and further analysis is still missing so far. Therefore, to characterize the specific effects of EPT on α → β transformation process, both EPT and THT experiments were conducted on Ti–6Al–4V sheet specimens. After that, a calculation method based on the analysis of optical microscopic (OM) metallographs was developed to characterize the amount of phase transformation in EPT and THT. According to the results, it was found that the pulse current can significantly reduce the phase transus temperature and accelerate the transformation process in EPT compared with that in THT. Furthermore, the specific effects of EPT on transus temperature and phase transformation rate were investigated in detail. Based on that, the transformation kinetics of the electropulsing-induced α → β phase transformation was also analyzed using the Johnson–Mehl–Avrami model. It is revealed that the activation energies of both nucleation and growth of phase transformation are reduced by electric current. Hence, the phase transformation can start at a lower temperature and with a higher rate in EPT. The mechanism behind the effects was also discussed in detail in the present work.

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