Preparation And Characterization Of Resistant Wollastonite / Ali Sehili

Public ISBD Titre : Preparation And Characterization Of Resistant Wollastonite Type de document : document électronique Auteurs : Ali Sehili, Auteur ; Soumia Zaiou, Directeur de thèse Editeur : Setif:UFA Année de publication : 2024 Importance : 1 vol (41 f.) Format : 29 cm Langues : Anglais (eng) Catégories : Thèses & Mémoires:Physique Mots-clés : Wollastonite Silicon dioxide Calcium Oxide Sintering Mechanical properties Index. décimale : 530 - Physique Résumé : The objective of this study is to elaborated of the wollastonite (CaSiO3), prepared from silicon dioxide (SiO2) and calcium oxide (CaO) of the deposit d’El Khroub (Constantine), using synthesis by the solid method. the prepared samples were also characterized by X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy and the mechanical tests was performed The results shows that 1100 °C is the best sintering temepature, it has been found that the density is about 97 % of the theoretical density value of wollastonite, X-ray analysis reveals that the phase appears is only that of wollastonite. This result has been confirmed by Fourier transform infrared spectroscopy. Note de contenu : Sommaire General Introduction.………….………………………………...……..............01 Chapter І: Literature Review I. 1. Ceramics Definition………………...…………………………………………………….03 I. 2. The different types of ceramics………………………………...…………………………03 I. 2. 1. Traditional ceramics………………………………..................................................05 I. 3. General properties of ceramics…………………………...................................................05 I. 3. 1. Chemical bond……………………………………………………………………...05 I. 3. 2. The microstructure………………………………………………………………….06 I. 4. Thermal Treatment of Ceramics-Sintering……………....................................................07 I. 4. 1. Sintering conditions………………………………………………………………....07 I . 5 .The different stages of sintering…………………………………………………………..08 I. 6. Bio-Ceramics……………………………………………....................................................09 I. 6.1. Applications of Bio-Ceramics………………………………………………………..09 I. 7. Wollastonite……………………………………………………………………………….10 I. 7. 1. Wollastonite Definition……………………………...................................................10 I. 7. 2. Properties of Wollastonite……………………………................................................10 I. 7. 3. Crystal structure……………………………………………………………………...11 I. 8. Biological characteristics of wollastonite………………………………………………….12 I .9. Applications of wollastonite in daily life…………………………………………………..13 Chapter ІІ: Wollastonite Elaboration And Characterization Techniques II. Introduction………………………………………………………………………………….14 II. 1. Characterization of raw materials…………………….....................................................14 II. 1. 1. Calcium Oxide……………………………………………………………………...14 â…¡.1.2. Silicon dioxide SiO2 …..………………………………………… ……………………………………………17 â…¡.2. Preparation of wollastonite ..……………………………………………………………...19 â…¡.2.1. Samples preparation……………………………….....................................................19 II.3. Characterization techniques……………………………………………………………….22 II. 3. 1. X-ray diffraction…………………………………....................................................22 II.3.2. Infrared spectroscopy………………………………………………………………...24 II.3.3. Scanning Electron Microscopy (SEM)……………………………………………....25 II. 4. Measurement of apparent density………………………………………………………...26 II. 5. Mechanical properties………………………………….....................................................27 II. 5. 1. Flexural strength…………………………………....................................................27 II.5. 2. Micro-hardness……………………………………………………………………...28 Chapter ІІІ: Results and Discussions III. Introduction ...……………………………………………………………………………...29 III. 1. Densification Properties…………………………………………………………………29 III. 2. Structural properties……………………...……………………………………………...30 III. 2. 1. X-ray diffraction…………………………………………………………………..30 III. 2. 2. Fourier-transform infrared spectroscopy……………………………..…………...32 III. 3. 3. Scanning Electron Microscopy…………………....................................................33 â… â… â… .3. Mechanical properties…………………………………....................................................35 â… â… â… .3.1. Vickers micro-hardnes………………………….......................................................35 â… â… â… .3.2. Flexural strength…………………………………....................................................36 Conclusion ...……………………………………………………………………………….38 References ……………………………………………..…………………………………...39 Côte titre : MAPH/0643 Preparation And Characterization Of Resistant Wollastonite [document électronique] / Ali Sehili, Auteur ; Soumia Zaiou, Directeur de thèse . - [S.l.] : Setif:UFA, 2024 . - 1 vol (41 f.) ; 29 cm. Langues : Anglais (eng) Catégories : Thèses & Mémoires:Physique Mots-clés : Wollastonite Silicon dioxide Calcium Oxide Sintering Mechanical properties Index. décimale : 530 - Physique Résumé : The objective of this study is to elaborated of the wollastonite (CaSiO3), prepared from silicon dioxide (SiO2) and calcium oxide (CaO) of the deposit d’El Khroub (Constantine), using synthesis by the solid method. the prepared samples were also characterized by X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy and the mechanical tests was performed The results shows that 1100 °C is the best sintering temepature, it has been found that the density is about 97 % of the theoretical density value of wollastonite, X-ray analysis reveals that the phase appears is only that of wollastonite. This result has been confirmed by Fourier transform infrared spectroscopy. Note de contenu : Sommaire General Introduction.………….………………………………...……..............01 Chapter І: Literature Review I. 1. Ceramics Definition………………...…………………………………………………….03 I. 2. The different types of ceramics………………………………...…………………………03 I. 2. 1. Traditional ceramics………………………………..................................................05 I. 3. General properties of ceramics…………………………...................................................05 I. 3. 1. Chemical bond……………………………………………………………………...05 I. 3. 2. The microstructure………………………………………………………………….06 I. 4. Thermal Treatment of Ceramics-Sintering……………....................................................07 I. 4. 1. Sintering conditions………………………………………………………………....07 I . 5 .The different stages of sintering…………………………………………………………..08 I. 6. Bio-Ceramics……………………………………………....................................................09 I. 6.1. Applications of Bio-Ceramics………………………………………………………..09 I. 7. Wollastonite……………………………………………………………………………….10 I. 7. 1. Wollastonite Definition……………………………...................................................10 I. 7. 2. Properties of Wollastonite……………………………................................................10 I. 7. 3. Crystal structure……………………………………………………………………...11 I. 8. Biological characteristics of wollastonite………………………………………………….12 I .9. Applications of wollastonite in daily life…………………………………………………..13 Chapter ІІ: Wollastonite Elaboration And Characterization Techniques II. Introduction………………………………………………………………………………….14 II. 1. Characterization of raw materials…………………….....................................................14 II. 1. 1. Calcium Oxide……………………………………………………………………...14 â…¡.1.2. Silicon dioxide SiO2 …..………………………………………… ……………………………………………17 â…¡.2. Preparation of wollastonite ..……………………………………………………………...19 â…¡.2.1. Samples preparation……………………………….....................................................19 II.3. Characterization techniques……………………………………………………………….22 II. 3. 1. X-ray diffraction…………………………………....................................................22 II.3.2. Infrared spectroscopy………………………………………………………………...24 II.3.3. Scanning Electron Microscopy (SEM)……………………………………………....25 II. 4. Measurement of apparent density………………………………………………………...26 II. 5. Mechanical properties………………………………….....................................................27 II. 5. 1. Flexural strength…………………………………....................................................27 II.5. 2. Micro-hardness……………………………………………………………………...28 Chapter ІІІ: Results and Discussions III. Introduction ...……………………………………………………………………………...29 III. 1. Densification Properties…………………………………………………………………29 III. 2. Structural properties……………………...……………………………………………...30 III. 2. 1. X-ray diffraction…………………………………………………………………..30 III. 2. 2. Fourier-transform infrared spectroscopy……………………………..…………...32 III. 3. 3. Scanning Electron Microscopy…………………....................................................33 â… â… â… .3. Mechanical properties…………………………………....................................................35 â… â… â… .3.1. Vickers micro-hardnes………………………….......................................................35 â… â… â… .3.2. Flexural strength…………………………………....................................................36 Conclusion ...……………………………………………………………………………….38 References ……………………………………………..…………………………………...39 Côte titre : MAPH/0643

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