Shuai Wang , Mao Chen , Baojun Zhao , Yufeng Guo , Jianfa Jing , Feng Chen , Lingzhi Yang
{"title":"还原条件下cao - sio2 - mgo - 13wt % Al2O3-TiO2体系的相组成和液相温度","authors":"Shuai Wang , Mao Chen , Baojun Zhao , Yufeng Guo , Jianfa Jing , Feng Chen , Lingzhi Yang","doi":"10.1016/j.calphad.2023.102639","DOIUrl":null,"url":null,"abstract":"<div><p>Effects of TiO<sub>2</sub><span>, binary basicity and MgO content on the liquidus temperatures of TiO</span><sub>2</sub>–CaO–SiO<sub>2</sub>–MgO–Al<sub>2</sub>O<sub>3</sub> slags were experimentally studied in equilibrium with carbon. The experimental techniques include high temperature equilibration, quenching and Electron Probe X-ray Microanalysis (EPMA). It was found that the major primary phase in the composition range investigated is M<sub>3</sub>O<sub>5</sub> (M = Ti, Mg, Al). The liquidus temperatures increase with increasing TiO<sub>2</sub> and MgO contents, whereas decrease with increasing CaO/SiO<sub>2</sub> mass ratio. The experimentally determined liquidus temperatures are much higher than the predicted ones by FactSage and the primary phases between the experiment results and predictions are also different. The mole fractions of Al<sub>2</sub>TiO<sub>5</sub> and Ti<sub>3</sub>O<sub>5</sub> in the M<sub>3</sub>O<sub>5</sub> phase decrease, but MgTi<sub>2</sub>O<sub>5</sub> increases with increasing MgO content and CaO/SiO<sub>2</sub> in the samples. Moreover, the proportions of Al<sub>2</sub>TiO<sub>5</sub> and MgTi<sub>2</sub>O<sub>5</sub> in the M<sub>3</sub>O<sub>5</sub> phase decrease, while Ti<sub>3</sub>O<sub>5</sub> proportion in the M<sub>3</sub>O<sub>5</sub> phase increases with increasing the reaction time. The mole ratio of Ti<sup>3+</sup>/Ti<sup>4+</sup> in the M<sub>3</sub>O<sub>5</sub> phase decreases with MgO content and CaO/SiO<sub>2</sub> mass ratio in the samples but increases with increasing reaction time.</p></div>","PeriodicalId":9436,"journal":{"name":"Calphad-computer Coupling of Phase Diagrams and Thermochemistry","volume":null,"pages":null},"PeriodicalIF":1.9000,"publicationDate":"2023-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Phase composition and liquidus temperatures of the CaO–SiO2–MgO-13 wt%Al2O3–TiO2 system in reduction conditions\",\"authors\":\"Shuai Wang , Mao Chen , Baojun Zhao , Yufeng Guo , Jianfa Jing , Feng Chen , Lingzhi Yang\",\"doi\":\"10.1016/j.calphad.2023.102639\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>Effects of TiO<sub>2</sub><span>, binary basicity and MgO content on the liquidus temperatures of TiO</span><sub>2</sub>–CaO–SiO<sub>2</sub>–MgO–Al<sub>2</sub>O<sub>3</sub> slags were experimentally studied in equilibrium with carbon. The experimental techniques include high temperature equilibration, quenching and Electron Probe X-ray Microanalysis (EPMA). It was found that the major primary phase in the composition range investigated is M<sub>3</sub>O<sub>5</sub> (M = Ti, Mg, Al). The liquidus temperatures increase with increasing TiO<sub>2</sub> and MgO contents, whereas decrease with increasing CaO/SiO<sub>2</sub> mass ratio. The experimentally determined liquidus temperatures are much higher than the predicted ones by FactSage and the primary phases between the experiment results and predictions are also different. The mole fractions of Al<sub>2</sub>TiO<sub>5</sub> and Ti<sub>3</sub>O<sub>5</sub> in the M<sub>3</sub>O<sub>5</sub> phase decrease, but MgTi<sub>2</sub>O<sub>5</sub> increases with increasing MgO content and CaO/SiO<sub>2</sub> in the samples. Moreover, the proportions of Al<sub>2</sub>TiO<sub>5</sub> and MgTi<sub>2</sub>O<sub>5</sub> in the M<sub>3</sub>O<sub>5</sub> phase decrease, while Ti<sub>3</sub>O<sub>5</sub> proportion in the M<sub>3</sub>O<sub>5</sub> phase increases with increasing the reaction time. The mole ratio of Ti<sup>3+</sup>/Ti<sup>4+</sup> in the M<sub>3</sub>O<sub>5</sub> phase decreases with MgO content and CaO/SiO<sub>2</sub> mass ratio in the samples but increases with increasing reaction time.</p></div>\",\"PeriodicalId\":9436,\"journal\":{\"name\":\"Calphad-computer Coupling of Phase Diagrams and Thermochemistry\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":1.9000,\"publicationDate\":\"2023-11-22\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Calphad-computer Coupling of Phase Diagrams and Thermochemistry\",\"FirstCategoryId\":\"88\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0364591623001116\",\"RegionNum\":3,\"RegionCategory\":\"材料科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q4\",\"JCRName\":\"CHEMISTRY, PHYSICAL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Calphad-computer Coupling of Phase Diagrams and Thermochemistry","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0364591623001116","RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
Phase composition and liquidus temperatures of the CaO–SiO2–MgO-13 wt%Al2O3–TiO2 system in reduction conditions
Effects of TiO2, binary basicity and MgO content on the liquidus temperatures of TiO2–CaO–SiO2–MgO–Al2O3 slags were experimentally studied in equilibrium with carbon. The experimental techniques include high temperature equilibration, quenching and Electron Probe X-ray Microanalysis (EPMA). It was found that the major primary phase in the composition range investigated is M3O5 (M = Ti, Mg, Al). The liquidus temperatures increase with increasing TiO2 and MgO contents, whereas decrease with increasing CaO/SiO2 mass ratio. The experimentally determined liquidus temperatures are much higher than the predicted ones by FactSage and the primary phases between the experiment results and predictions are also different. The mole fractions of Al2TiO5 and Ti3O5 in the M3O5 phase decrease, but MgTi2O5 increases with increasing MgO content and CaO/SiO2 in the samples. Moreover, the proportions of Al2TiO5 and MgTi2O5 in the M3O5 phase decrease, while Ti3O5 proportion in the M3O5 phase increases with increasing the reaction time. The mole ratio of Ti3+/Ti4+ in the M3O5 phase decreases with MgO content and CaO/SiO2 mass ratio in the samples but increases with increasing reaction time.
期刊介绍:
The design of industrial processes requires reliable thermodynamic data. CALPHAD (Computer Coupling of Phase Diagrams and Thermochemistry) aims to promote computational thermodynamics through development of models to represent thermodynamic properties for various phases which permit prediction of properties of multicomponent systems from those of binary and ternary subsystems, critical assessment of data and their incorporation into self-consistent databases, development of software to optimize and derive thermodynamic parameters and the development and use of databanks for calculations to improve understanding of various industrial and technological processes. This work is disseminated through the CALPHAD journal and its annual conference.