Joining Process of alumina to the titanium-zirconium-molybdenum alloy : method of elaboration, characterization and numerical modeling of the junction
This thesis aims to examine the feasibility to join massive ceramic and metal parts by the use of the experience acquired in the laboratory on the preoxidation process of the metal substrate, which has been successful in the case of plasma coatings on steels and nickel. We will find the bibliographic positioning of this study, then the reasons that led to interest in the assembly TZM / alumina and to choose the process of thermocompression. Then, the elaboration method is presented, and followed by a whole part devoted to the physicochemical characterization of the assemblies obtained, giving a particular place to the numerical simulation of the constraints, for those remaining in the assembly after its elaboration, and those appearing within when subjected to tensile stresses. Finally, it seemed interesting to append to the appendix the essential elements of a numerical study of the C35 / alumina steel assembly, which served to qualify the simulation method used in this work and which demonstrates the power of this method.
Cette thèse se propose d’examiner la faisabilitĂ© de l’assemblage de pièces massives cĂ©ramiques et mĂ©talliques en mettant Ă profit l’expĂ©rience acquise au laboratoire sur le procĂ©dĂ© de prĂ©oxydation du substrat mĂ©tallique, qui a fait ses preuves dans le cas des revĂŞtements plasmas sur aciers et sur le nickel. On trouvera ainsi le positionnement bibliographique de cette Ă©tude, puis les raisons qui ont poussĂ© Ă s’intĂ©resser Ă l’assemblage TZM / alumine et Ă choisir le procĂ©dĂ© de thermocompression. Ensuite sont prĂ©sentĂ© le mode d’élaboration, et tout une partie consacrĂ©e Ă la caractĂ©risation physico-chimique des assemblages obtenus, en faisant une place toute particulière Ă la simulation numĂ©rique des contraintes, aussi bien celles qui subsistent dans l’assemblage après son obtention, que dans celles qui apparaissent en son sein lorsqu’il est soumis Ă des efforts de traction. Enfin, il a semblĂ© intĂ©ressant de reporter en annexe les Ă©lĂ©ments essentiels d’une Ă©tude numĂ©rique de l’assemblage acier C35 / alumine, qui a servi Ă qualifier la mĂ©thode de simulation employĂ©e dans ce travail et qui dĂ©montre la puissance de cette mĂ©thode.
https://tel.archives-ouvertes.fr/tel-02506433/file/2019LIMO0115.pdf