Effect of nanosized titanium and silicon carbides on synthesis and consolidation of titanium silicon carbide during spark plasma sintering

International Conference on Synthesis and Consolidation of Powder Materials

Kulmet'Eva, V.B.^1 ; Kachenyuk, M.N.^1 ; Oglezneva, S.A.^1 ; Smetkin, A.A.^1

Perm National Research Politechnical University, Perm

614990, Russia^1

关键词: Isothermal time;    Material structure;    Planetary mills;    Powder mixtures;    Secondary phasis;    Spark plasma sintering method;    Titanium silicon carbide;    X ray structural analysis;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/558/1/012019/pdf
DOI  :  10.1088/1757-899X/558/1/012019

来源: IOP

【 摘 要 】

Using spark plasma sintering method, at temperature T = 1400°C and load of 30 MPa samples of composite material Ti3SiC2/TiC were obtained. Before SPS powder mixtures with molar ratio 3Ti-1.25SiC-0.75C with addition of up to 4% wt of nanopowders of titanium carbide or silicon carbide were mechanically activated in a planetary mill. Material structure was studied using X-ray structural analysis, hardness and fracture toughness was evaluated on basis of Vicker's indentation results. It was established that introduction of nanocarbides up to 1% wt significantly reduces contents of Ti3SiC2, and further on practically has no influence on phase composition. Increase of isothermal time from 5 to 15 min leads to an increase in the TixSiy secondary phases to 11-14%. Introduction of nano-TiC and nano-SiC into mixtures increases crack fracture toughness to 7.06-7.55 MPa•m1/2 for samples after 5 min of SPS and practically does not change it after 15 min of SPS.