Creep Behavior of Polymer Precursor Derived Si3N4/SiC Nanocomposites

Two batches of plasma sprayed zirconia-alumina-spinel powder (with or without high energy ball milling (HEBM)) were consolidated to full density by spark plasma sintering (SPS). The resulting nanocomposite showed superplasticity with a high activation energy of 945 kJ/mol for the HEBMed batch; the a...

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Bibliographische Detailangaben
Hauptverfasser:	Mukherjee, Amiya K, Zhou, Xinzhang, Hulbert, Dustin M, Kuntz, Joshua D, Sadangi, Rajendra K
Format:	Report
Sprache:	eng
Schlagworte:	ACTIVATION ENERGY ALUMINATES BALL MILLS BEHAVIOR CERAMIC MATERIALS COMPOSITE MATERIALS CREEP GRAIN BOUNDARIES HEBM(HIGH ENERGY BALL MILLING) Laminates and Composite Materials MICROSTRUCTURE NANOCERMAIC NANOCERMAICS NANOCOMPOSITES PLASMA SPRAYING PLASTIC DEFORMATION SINTERING SPINEL SPS(SPARK PLASMA SINTERING) SUPERPLASTICITY ZIRCONIA
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Zusammenfassung:	Two batches of plasma sprayed zirconia-alumina-spinel powder (with or without high energy ball milling (HEBM)) were consolidated to full density by spark plasma sintering (SPS). The resulting nanocomposite showed superplasticity with a high activation energy of 945 kJ/mol for the HEBMed batch; the absence of HEBM treatment resulted in no superplastic behavior. The special grain boundary formed during SPS from nucleation and growth of new phases from metastable matrix in plasma sprayed powder is believed the key microstructure to turn this superplastic triphase ceramics into a non-superplastic one. If TEM analysis currently in process proves our postulation plasma spraying may be a potential technique to make intrinsically creep-resistant microstructures.