Effect of zirconia and iron on the mechanical properties of Al2O3/TiC composites processed using combined self-propagating synthesis and direct consolidation technique

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:696

Article

Ahmed, Y. M. Z.¹  Zaki, Z. I.^1,2  Besisa, D. H. A.¹  Amin, A. M. M.¹  Bordia, R. K.³ 

[1] CMRDI, Refractory & Ceram Mat Dept, POB 87, Helwan 11421, Helwan, Egypt

[2] Taif Univ, Fac Sci, Chem Dept, Mat Sci & Engn Grp, POB 888, Al Haweiah, Taif, Saudi Arabia

[3] Clemson Univ, Mat Sci & Engn, Clemson, SC 29634 USA

关键词: TiC/Al2O3 composite;    Self propagating high temperature synthesis;    Microhardness;    Fracture toughness;   

DOI  :  10.1016/j.msea.2017.04.059

来源: Elsevier

【 摘 要 】

Self-propagating high temperature synthesis combined with direct consolidation technique was used to synthesize high density Al2O3/TiC composites from mixture of TiO2, Al and graphite powders. The effect of controlled amount of zirconia and iron addition on the density, microstructure and the mechanical properties of the composites was investigated. The results revealed that, addition of either 1.0 mol zirconia or 5.0 wt% of iron metal powder led to a significant decrease in the sample porosity from 7.0 to less than 1.0 vol% together with a remarkable enhancement in the microhardness from 6.0 to 11.0 and 12.0 GPa with 1.0 mol zirconia and 5.0 wt% iron additions, respectively. Moreover, the fracture toughness increased from 3.5 to 6.0 and 7.0 MPa m(1/2) with 1.0 mol zirconia and 15 wt% iron additions, respectively. However, addition of 1.0 mol zirconia with 5.0 wt% iron powder led to a composite with higher porosity and reduced mechanical properties.

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