Browsing NTNU Open by Author "Tang, Kai"
Now showing items 1-20 of 34
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A thermodynamic assessment of the Nd-C system
Bian, Yuyang; Tang, Kai; Tranell, Gabriella (Journal article; Peer reviewed, 2015)The Nd–C binary system has been assessed based on the experimental investigation, thermodynamic calculations and the literature survey. The intermediate compounds Nd2C3 and βNdC2 (high-temperature form of NdC2 phase) were ... -
Boron Removal from Silicon by Humidified Gases
Safarian-Dastjerdi, Jafar; Tang, Kai; Hildal, Kjetil; Tranell, Gabriella (Journal article; Peer reviewed, 2014)Boron (B) is one of the most problematic impurities to remove from metallurgical grade silicon in the production of more pure solar grade silicon (SoG-Si). In the present work, recent progresses in the application of ... -
Boron Removal from Silicon Melt by gas Blowing Technique
Hoseinpur Kermani, Arman; Andersson, Stefan; Müller, Michael; Tang, Kai; Safarian, Jafar (Peer reviewed; Journal article, 2022)Due to the detrimental effects of boron (B) on the efficiency of silicon (Si) photovoltaic cells, complete boron removal from Si is necessary to produce solar grade Si (SoG–Si, with a maximum limit of 0.1 ppmw boron). Gas ... -
Combined silicon refining for boron removal and Si-Kerf recycling using K2O-CaO-SiO2 slags
Zhu, Mengyi; Wu, Guixuan; Tang, Kai; Müller, Michael; Safarian, Jafar (Peer reviewed; Journal article, 2024) -
Combined silicon refining for boron removal and Si-Kerf recycling using K2O-CaO-SiO2 slags
Zhu, Mengyi; Wu, Guixuan; Tang, Kai; Müller, Michael; Safarian, Jafar (Peer reviewed; Journal article, 2024)It is crucial for the photovoltaic (PV) industry to establish a circular materials flow for more sustainable solar silicon production. In the present work, a series of K2O-SiO2 and K2O-CaO-SiO2 slags were examined for the ... -
Effects of La2O3 Addition into CaO-SiO2 Slag: Structural Evolution and Impurity Separation from Si-Sn Alloy
Zhu, Mengyi; Wu, Guixuan; Azarov, Alexander; Monakhov, Eduard; Tang, Kai; Müller, Michael; Safarian, Jafar (Peer reviewed; Journal article, 2021)Boron (B) and phosphorus (P) are the most problematic impurities to be removed in the production of solar-grade silicon by the metallurgical process. In this work, the distribution of B and P between CaO-(La2O3)-SiO2 slags ... -
High temperature interaction between Si–B alloys and Si3N4
Jiao, Jian Meng; Tang, Kai; Safarian, Jafar; Grorud, Bettina; Sellevoll, Kathrine; Tangstad, Merete (Peer reviewed; Journal article, 2021)Si3N4 is a candidate crucible material for Si–B alloys in high temperature thermal energy storage system. In this regard, the phase formation in the Si–B alloys and the interaction between the alloys and Si3N4 were ... -
Impurity removal from Si by Si-Ca-Mg ternary alloying-leaching system
Zhu, Mengyi; Wan, Di; Tang, Kai; Safarian, Jafar (Peer reviewed; Journal article, 2020)In this work, Si-Ca-Mg alloys were made with different compositions and solidification conditions to investigate the impurity segregation and separation performance from Si, especially for the crucial P impurity at several ... -
Investigation of Two Immiscible Liquids Wetting at Elevated Temperature: Interaction Between Liquid FeMn Alloy and Liquid Slag
Bao, Sarina; Tangstad, Merete; Tang, Kai; Einarsrud, Kristian Etienne; Syvertsen, Martin; Onsøien, Morten Ingar; Kudyba, Artur; Bublik, Sergey (Peer reviewed; Journal article, 2021)The goal of the current work is to develop a methodology to study the wetting behaviour of two immiscible liquids at high temperatures, and to investigate the parameters which influence the wetting properties. The wetting ... -
Kinetic study of vacuum evaporation of elements from ternary melts; case of dilute solution of P in Si-Al melts
Hoseinpur Kermani, Arman; Tang, Kai; Safarian, Jafar (Journal article; Peer reviewed, 2019)This research is devoted to study phosphorus removal from Si-Al alloys by vacuum refining of the ternary system of dilute solutions of P in Si-20 wt%Al. The experiments were carried out in an induction furnace and after ... -
Magnesiothermic Reduction of Silica: A Machine Learning Study
Tang, Kai; Rasouli, Azam; Safarian, Jafar; Ma, Xiang; Tranell, Maria Gabriella (Peer reviewed; Journal article, 2023)Fundamental studies have been carried out experimentally and theoretically on the magnesiothermic reduction of silica with different Mg/SiO2 molar ratios (1–4) in the temperature range of 1073 to 1373 K with different ... -
Mechanisms and Kinetics of Boron Removal from Silicon by Humidified Hydrogen
Safarian, Jafar; Tang, Kai; Olsen, Jan Erik; Andersson, Stefan; Tranell, Gabriella; Hildal, Kjetil (Journal article; Peer reviewed, 2016)The removal of boron from silicon by top blowing of humidified hydrogen has been studied in the present work through experimental work, thermodynamic calculations, computational fluid dynamic modeling, and quantum chemistry ... -
Microstructure and Mechanical Properties of 6013 Aluminum Alloy Processed by a Combination of ECAP and Preaging Treatment
Jiang, Jiawei; Liu, Manping; Liu, Yang; Tang, Kai; Wang, Zibo; Li, Yichao; Yu, Yingda; Skaret, Pål Christian; Roven, Hans Jørgen (Journal article; Peer reviewed, 2017)Microstructure and mechanical properties of a 6013 Al-Mg-Si-Cu aluminum alloy processed by a combination of equal channel angular pressing (ECAP) and preaging treatment were comparatively investigated using quantitative ... -
Modeling over-ageing in Al-Mg-Si alloys by a multi-phase CALPHAD-coupled Kampmann-Wagner Numerical model
Du, Qiang; Tang, Kai; Marioara, Calin Daniel; Andersen, Sigmund Jarle; Holmedal, Bjørn; Holmestad, Randi (Journal article, 2017)The formation of the equilibrium precipitation phase during ageing treatment of Al-Mg-Si alloys is preceded by a series of metastable phases. Given longer ageing time, higher ageing temperature or elevated temperature ... -
Modeling Viscosity of High Titania Slag
Hu, Kai; Tang, Kai; Lv, Xuewei; Safarian, Jafar; Yan, Zhiming; Song, Bing (Peer reviewed; Journal article, 2020)TiO2-FeO-Ti2O3 slag system is the dominant system for industrial high-titania slag production. In the present work, viscosities of TiO2-FeO and TiO2-FeO-Ti2O3 systems were experimentally determined using the concentric ... -
Modelling and experimental validation of microstructure evolution during the cooling stage of homogenization heat treatment of Al-Mg-Si alloys
Du, Qiang; Jia, Lina; Tang, Kai; Holmedal, Bjørn (Journal article; Peer reviewed, 2018)A CALPHAD-coupled multi-component multi-phase Kampmann–Wagner Numerical modelling framework has been adapted and coupled with a homogenization model to predict the competitive nucleation and growth of multi-sized ... -
Modelling microstructure evolution during casting, homogenization and ageing heat treatment of Al-Mg-Si-Cu-Fe-Mn alloys
Tang, Kai; Du, Qiang; Li, Yanjun (Journal article; Peer reviewed, 2018)Understanding microstructural evolution occupies one of the central positions in the discipline of materials science and engineering. In this review we summarize the recent research activities on modelling microstructure ... -
New Insights into Silicon Purification by AlloyingLeaching Refining: A Comparative Study of MgSi, CaSi, and CaMgSi Systems
Zhu, Mengyi; Shengying, Yue; Tang, Kai; Safarian, Jafar (Peer reviewed; Journal article, 2020)In the present work, a comparative study of the silicon alloying–leaching purification process was carried out on the recently developed Mg–Si system, the Ca–Si system, and the novel ternary Ca–Mg–Si system. Insights were ... -
P removal from Si by Si-Ca-Al alloying-leaching refining: Effect of Al and the CaAl2Si2 phase
Zhu, Mengyi; Yue, Shengying; Wu, Guixuan; Tang, Kai; Xu, Yijiang; Safarian, Jafar (Peer reviewed; Journal article, 2021)Phosphorus (P) is a critical impurity in metallurgical-grade Si that needed to be removed for solar-grade Si production. The Si-Ca-Al-P system is one of the most crucial alloy systems for Si refining, where P can be separated ... -
Phosphorus separation from metallurgical-grade silicon by magnesium alloying and acid leaching
Zhu, Mengyi; Azarov, Alexander; Monakhov, Eduard; Tang, Kai; Safarian, Jafar (Peer reviewed; Journal article, 2020)n this paper, the separation of phosphorus from metallurgical-grade silicon was investigated based on an Mgalloying and HCl leaching approach. Experimental results show that P concentration was reduced from initial15.1pp ...