High temperature erosion behavior of spark plasma sintered ZrB2-SiC composites

Damage of structural components of hypersonic vehicles by atmospheric particles demands thorough understanding on their wear behavior. In the present work, dense ZrB2-SiC (10, 20, and 30vol%) composites are prepared by spark plasma sintering at 55MPa in two stages: 1400°C for 6min followed by 1600°C...

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Bibliographic Details
Published inCeramics international Vol. 43; no. 12; pp. 8982 - 8988
Main Authors Kumar Sharma, Sandan, Yashpal, Selokar, Ashish W., Kumar, B. Venkata Manoj, Venkateswaran, T.
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 15.08.2017
Subjects
Composites
Erosion wear
Silicon carbide
Wear mechanisms
Zirconium diboride
Zirconium diboride
Composites
Silicon carbide
Wear mechanisms
Erosion wear
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Summary:Damage of structural components of hypersonic vehicles by atmospheric particles demands thorough understanding on their wear behavior. In the present work, dense ZrB2-SiC (10, 20, and 30vol%) composites are prepared by spark plasma sintering at 55MPa in two stages: 1400°C for 6min followed by 1600°C for 2min. With increase in SiC content, microstructures of sintered composites reveal strongly bonded ZrB2 grains with SiC particles. A combination of maximum hardness of 23GPa, elastic modulus of 398GPa and fracture toughness of 5.4MPam1/2 are obtained for the composite containing 30vol% SiC particles. It is found that cracks are bridged or deflected by SiC particles in the composites. When the composites are subjected to SiC particle erosion at 800°C, a 14% decrease in erosion rate is obtained with increase in SiC content from 10 to 30vol%. The formation of large extent of boro-silicate rich viscous surface on eroded surfaces is attributed to reduced fracture or removal of ZrB2 grains of the composites with increased SiC content.
ISSN:0272-8842
1873-3956
DOI:10.1016/j.ceramint.2017.04.039