Surface Oxidation Study of ZrB2–SiC Composite for Re-entry Applications Using Free Piston-Driven Shock Tube

Vishakantaiah, Jayaram; Venketeswaran, T.; Venkateswaran, C.; Ajith, M.R.; Natarajan, Suraj; Reddy, K. P. J.

doi:10.1007/978-3-319-46213-4_107

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“…18 In another earlier study, Jayaram et al carried out shock tube experiments in oxygen environment with hot pressed ZrB 2 -SiC-MoSi 2 composite and observed the formation of zirconium dioxide and silicon dioxide. 19 Likewise, Monteverde et al reported the oxidation and thermal shock resistance of ZrB 2 -based UHTC under the dissociated flow, simulating the aerothermal heating in hypersonic re-entry conditions and reported the formation of a protective SiO 2 layer at a test temperature of ∼2100 K. This improves the oxidation resistance and thermomechanical properties. 20 In the case of hot pressed and spark plasma sintered TiB 2 -based ceramics, surface oxidation is reported as a result of shock wave exposure.…”

Section: Introductionmentioning

confidence: 97%

Computational and Microstructural Stability Analysis of Shock Wave Interaction with NbB₂-B₄C-Based Nanostructured Ceramics

Maity

Gopinath²,

Janardhanraj³

et al. 2019

ACS Appl. Mater. Interfaces

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Despite extensive research on developing different transition metal boride composites for aero-thermostructural applications, the understanding of the shockwave interaction using high pressure shock testing facilities and computational simulation of such interactions are much less explored. This aspect is even more important for much less explored ceramics, like NbB 2 -based materials. While addressing this aspect, the present investigation reports the thermostructural stability of spark plasma sintered NbB 2 -(0-40) mol % B 4 C composites under the hypersonic aerothermodynamic conditions using a miniature detonation-driven shock tube facility. All the ceramic discs underwent mild surface oxidation, as a consequence to impulsive load together with the thermomechanical shock. Using the in situ recorded pressure pulse data together with conjugate heat transfer analysis, spatiotemporal evolution of ceramic surface temperature was computationally analyzed for the given test conditions. Importantly, the NbB 2 -(0 and 20) mol % B 4 C composite retained structural integrity even after exposure to 10 shock pulses with maximum reflected shock temperature and pressure of 5000 K and 37.5 MPa, respectively. In contrast, NbB 2 -40 mol % B 4 C underwent structural failure by shattering to pieces. An attempt has been made to rationalize such results on the basis of thermal shock resistance parameters, estimated using the Kingery and Hasselman model. It is observed that NbB 2 -(0 and 20) mol % B 4 C shows higher crack propagation resistance, that is, 20 and 30%, respectively, under thermal shock (R″) than NbB 2 -40 mol % B 4 C. Interestingly, all the shock exposed NbB 2 -B 4 C ceramics show a measurable increase in hardness, which is attributed to transient melting and solidification of constituent phases due to interaction with shock heated gas, for a short duration of ∼5 ms. Taken together, the present study establishes the potential of NbB 2 -B 4 C composites for aero-thermostructural applications.

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Section: Introductionmentioning

confidence: 97%

Computational and Microstructural Stability Analysis of Shock Wave Interaction with NbB₂-B₄C-Based Nanostructured Ceramics

Maity

Gopinath²,

Janardhanraj³

et al. 2019

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

show abstract

Surface Oxidation Study of ZrB2–SiC Composite for Re-entry Applications Using Free Piston-Driven Shock Tube

Cited by 1 publication

References 7 publications

Computational and Microstructural Stability Analysis of Shock Wave Interaction with NbB₂-B₄C-Based Nanostructured Ceramics

Computational and Microstructural Stability Analysis of Shock Wave Interaction with NbB₂-B₄C-Based Nanostructured Ceramics

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Surface Oxidation Study of ZrB2–SiC Composite for Re-entry Applications Using Free Piston-Driven Shock Tube

Cited by 1 publication

References 7 publications

Computational and Microstructural Stability Analysis of Shock Wave Interaction with NbB2-B4C-Based Nanostructured Ceramics

Computational and Microstructural Stability Analysis of Shock Wave Interaction with NbB2-B4C-Based Nanostructured Ceramics

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Computational and Microstructural Stability Analysis of Shock Wave Interaction with NbB₂-B₄C-Based Nanostructured Ceramics

Computational and Microstructural Stability Analysis of Shock Wave Interaction with NbB₂-B₄C-Based Nanostructured Ceramics