Reaction heat utilization potential in mullite and spinel based ceramics synthesis and sintering

    Research output: Contribution to conferenceConference articleScientific

    Abstract

    Typically synthesis of technical ceramics, such mullite and spinels, requires high temperatures and long sintering times. Traditional production routes consume lot of energy, which increases the cost of products and have high environmental burden. Therefore low-energy intensity processing routes are sought for. Self-propagating High-temperature Synthesis (SHS) is offering one energy efficient route for making advanced composites and intermetallic compounds. The SHS process is traditionally limited only to highly exothermic reactions where the released combustion energy is exploited. Present work studies the potential of utilization the heat released from the exothermic reactions in ceramic synthesis and sintering. For example the initialization of the endothermic reaction of mullite formation reaction is studied. Exothermically reactive raw material (aluminium powder) is examined for less external energy requiring synthesis of mullite and magnesium aluminate spinel based ceramics. Thermodynamics calculations and the analysis of the energy balance compared to the conventional sintering bonding are presented for selected materials. In addition thermogravimetry (TGA) combined to Differential Scanning Calorimetry (DSC) is used for examination of thermal behaviour of raw materials and reacted materials. X-ray diffractometry (XRD) and scanning electron microscope (SEM) studies are used for phase structure analysis.
    Original languageEnglish
    Publication statusPublished - 2016
    EventInnovative Manufacturing Technology, IMT 2016 - Krynica Zdrój, Poland
    Duration: 13 Apr 201615 Apr 2016

    Conference

    ConferenceInnovative Manufacturing Technology, IMT 2016
    Abbreviated titleIMT 2016
    CountryPoland
    CityKrynica Zdrój
    Period13/04/1615/04/16

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    Keywords

    • low-energy intensity processing
    • mullite and spinel based ceramics

    Cite this

    Karhu, M., Lagerbom, J., & Kivikytö-Reponen, P. (2016). Reaction heat utilization potential in mullite and spinel based ceramics synthesis and sintering. Paper presented at Innovative Manufacturing Technology, IMT 2016, Krynica Zdrój, Poland.