Microstructure and properties of MAX-based composites manufactured from Ti3SiC2-based and Ti/SiC powders by FAST/SPS in vacuum

• DOI: 10.1016/j.vacuum.2023.112425
• Publication Date: 2023-07-20T16:51:56Z
• Authors: Jakub Wiśniewski; Maria Wiśniewska; Wiktoria Krzyżaniak; Volf Leshchynsky; Piotr Siwak; Jarosław Jakubowicz; Dariusz Garbiec
• Keywords: Spark Plasma Sintering; Powder Metallurgy

The synthesis of MAX-based composites from Ti3SiC2-based and non-stoichiometric Ti/SiC powders was developed via field-assisted sintering technology/spark plasma (FAST/SPS) in vacuum at temperatures ranging 1350 to 1450 °C, with a heating rate 200 °C/min, holding time 1.5 15 min, compaction pressure 60 MPa. phase composition the analyzed using X-ray diffraction (XRD), while microstructure examined by means light microscopy (LM) scanning electron (SEM) energy dispersive X-Ray spectroscopy (EDS). specific features MAX formation mechanically alloyed powder were defined. hardness, nanohardness, Young's modulus, strain gradient model parameters determined. Calculations based on load-displacement curves allowed indicate such materials' properties as true characteristic depth. friction wear behavior investigated 20 700 °C test loads 10 40 N, revealing self-lubricating effects during sliding. A near-zero effect high found for sintered powder. resulting exhibited hardness 810–860 HV10 fracture toughness 5.5–6.5 MPa m1/2 samples 1100–1200 5.0–5.3 In both cases, Ti3SiC2 dominant phase, TiSi2, SiC, TiC also present samples.