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Silicothermal Synthesis and Densification of X-sialon in the Presence of Metal Oxide Additives by C.M. Sheppard; K.J.D. MacKenzie is a Materials Science article available to read on EtoBox.
What is Silicothermal Synthesis and Densification of X-sialon in the Presence of Metal Oxide Additives about?
The eect is reported of seven inorganic oxide additives on both the formation mechanism and the den-si®cation of X-sialon prepared by a silicothermal process. The oxides were added to the starting mixture of halloysite clay, alumina and elemental silicon at a level of 1 wt% of the calculated ®nal product, and ®red in nitrogen at 1200±1500 C. The formation of X-sialon was monitored by thermal analysis, powder XRD and 27 Al and 29 Si solid state MAS NMR. The eects of the additives are temperature dependent, and in ̄uence the various stages of the reaction by diering degrees. The oxides which best promote the formation of crystalline X-sialon (Y 2 O 3 , CaO and MgO) are also those which facilitate the conversion of initially-formed Si 3 N 4 to SiO 2 N 2 and SiO 3 N units, the latter being particularly enhanced by Y 2 O 3 , Fe 2 O 3 enhances the initial nitridation of Si but suppresses X-sialon formation by stabilising the preceding mullite phase. Densi®cation is most enhanced by Y 2 O 3 , CaO and CeO 2 ; MgO exerts its maximum eect on sintering at lower temperatures. The bene®cial in ̄uence of MgO and Y 2 O 3 on both X-sialon formation and sintering is due to the formation of liquid p
Who reads Silicothermal Synthesis and Densification of X-sialon in the Presence of Metal Oxide Additives?
It is typically read by researchers, students, and practitioners in Materials Science.
- Author
- C.M. Sheppard; K.J.D. MacKenzie
- Publisher
- Elsevier Science; Elsevier ; Elsevier BV (ISSN 0955-2219)
- Published
- 1999
- Language
- EN
- Field
- Materials Science (Physical Sciences)