Oxidation studies on TaC based ultra-high temperature ceramic composites under plasma arc jet exposure

Nisar, Ambreen; Ariharan, S.; Venkateswaran, T.; Sreenivas, N.; Balani, Kantesh

doi:10.1016/j.corsci.2016.03.013

Cited by 70 publications

(21 citation statements)

References 56 publications

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“…Further, the temperature generated during fretting contact was theoretically estimated to be ≈322–360 °C (see Table ). The dissipation energy increased with reinforcement (from 3 J for TaC to 5.4 J for T15S, 6.2 J for T15C, and 5.8 J for T15S15C), however, the estimated surface temperature decrease (from 360 °C for TaC to 345 °C for T15S, 322 °C for T15C, and 332 °C for T15S15C) is attributed to an increased thermal conductivity with SiC and CNT reinforcement . The absence of any crack either on TaC‐based composites (Figure ) or the Al 2 O 3 ball (Figure ), unequivocally represents that the formed tribolayer is protective in nature leading to lower wear rates with SiC and CNT reinforcement and hence, the energy is dissipated in the form of heat.…”

Section: Resultsmentioning

confidence: 97%

“…According to Archard, the contact temperature rise (Δ T m ) can be estimated using the following equation:

Δ T_{m} = \frac{μ V {(π P_{o} F_{n})}^{0.5}}{(8 κ)}

where μ is the COF, V is the sliding velocity, and κ is the thermal conductivity of the TaC‐based composites. The values of thermal conductivity of TaC‐based composites, which increases with SiC and CNT reinforcement (i.e., κ TaC = 18.5 Wm −1 K −1 , κ T15S = 34.7 Wm −1 K −1 , κ T15C = 35.8 Wm −1 K −1 , and κ T15S15C = 40.8 Wm −1 K −1 ) have been taken from a previous study …”

Section: Resultsmentioning

confidence: 99%

“…TaC starts oxidizing even at 400 °C, but since the theoretically estimated contact temperature lies between 322–360 °C (see Table ), possibility of oxidation may be ruled out. The result reconfirms that the proclaimed tribolayer is protective and which is reflected in terms of crack free surface (Figure ).…”

Section: Resultsmentioning

confidence: 99%

“…It is to be noted that most of the available literature on TaC‐based composites is focused only on processing and their oxidation behavior, but, no study converges on their wear behavior. Fretting may arise from increased vibration and lead to catastrophic failure of the component under service, therefore, assessment of fretting induced wear is essential for predicting the safe service life of components employed to engineering applications .…”

Section: Introductionmentioning

confidence: 99%

“…Authors have recently reported the processing, microstructural, mechanical, and oxidative properties of TaC‐based UHTC composites, therefore, it is imperative to look into the wear behavior of these composites. An effort is made to correlate microstructural, mechanical, and wear properties with synergistic reinforcement of SiC and CNT in TaC‐based UHTC composites.…”

Section: Introductionmentioning

confidence: 99%

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Role of Interfaces on Multi‐length Scale Wear Mechanics of TaC‐based Composites

Nisar

Balani

2017

Adv Eng Mater

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In the current work, contact-mechanics at different length scale is utilized to correlate damage accumulation in TaC-based composites. Upon synergistic reinforcement with silicon carbide (SiC) and carbon nanotubes (CNTs), TaC has shown to reduce the wear rate from 10.5 Â 10 À7 to 4.1 Â 10 À7 mm 3 N À1 m À1 upon fretting (micro-wear) and from 8.0 to 2.7 mm 3 N À1 m À1 upon microscratching (meso-wear). Enhancement in the fracture toughness from 2.9 to 10.7 MPam 1/2 with reinforcement is attributed to the processing induced defects (such as dislocation, stacking fault etc.) in SiC and strong interfacial bonding of CNTs with TaC, as revealed by transmission electron microscopy (TEM). Delineation of the synergistic contribution of SiC and CNT reinforcement in TaC establishes the wear mechanism to be abrasion (via fretting test), brittle tensile cracking, and fracture (via micro-scratch test).

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Section: Resultsmentioning

confidence: 97%

“…According to Archard, the contact temperature rise (Δ T m ) can be estimated using the following equation:

Δ T_{m} = \frac{μ V {(π P_{o} F_{n})}^{0.5}}{(8 κ)}

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Role of Interfaces on Multi‐length Scale Wear Mechanics of TaC‐based Composites

Nisar

Balani

2017

Adv Eng Mater

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Fracture‐Resistant and Thermally Insulating Ultrahigh‐Temperature Carbide Foams

Nisar,

Lopez,

Thomas

et al. 2023

Adv Eng Mater

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Dense ultra‐high temperature carbides (UHTCs) are recognized as potential materials for thermal protection systems (TPS) owing to properties beyond existing structural materials’ capabilities. Recent advances in the fabrication of UHTCs have enabled the development of multiscale porous microstructure. The present study highlights no longer the porosity in UHTCs will be treated as a defect but as a functional property specifically tailored for thermal insulation. It is a promising solution to design and fabricate bulk UHTC foams via a freeze‐drying (FD) approach followed by calibrated pressureless spark plasma sintering (PSPS). Herein, monolithic TaC and HfC UHTC foams and their composite show the partial solid‐solution formation of (Ta, Hf)C with porosity ≥ 50%. TaC‐HfC foam (∽80 to 92 N) showed an intermediate load‐bearing capability compared to monolithic TaC (∽120 to 135 N) and HfC (∽28 to 35 N) foams, with no evident cracking on the sample surface. The thermal conductivity of partial solid‐solution TaC‐HfC foam increased up to 5‐fold compared to parent UHTC foams. The results illustrate solid solutions’ efficacy and pores’ unidirectionality in providing thermal insulation to TaC‐HfC while maintaining its high‐load bearing capability. The developed technique will establish a new paradigm shift in UHTCs, expanding their potential for TPS in extreme environments.This article is protected by copyright. All rights reserved.

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Structure Prediction and Mechanical Properties of Tantalum Carbide (TaC) on ab initio Level

Zagorac,

Škundrić

et al. 2024

Zeitschrift anorg allge chemie

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Tantalum carbide (TaC) is an extremely hard, brittle, refractory ceramic material with excellent physical properties, which makes it a desirable material in e.g. aerospace industries. In order to explore the range of feasible modifications of TaC, we have executed a crystal structure prediction study of the TaC chemical system using a multi‐methodological approach, via enthalpy landscape explorations of pristine TaC at different pressures, supplemented by data mining searches in the ICSD database. Local structure relaxations have been accomplished by using Density Functional Theory (DFT). The global minimum is found to correspond to the equilibrium rock salt (NaCl) type modification. Additionally, eight new phases of tantalum carbide are predicted to be feasible: the WC‐type, the NiAs‐type, the 5‐5‐type, the ZnS‐type, the Ring_TaC‐type, the CsCl‐type, the Ortho_TaC‐type, and the Tetra_TaC‐type. Furthermore, the elastic and mechanical properties of the predicted TaC modifications were explored on the DFT level of computation. The promising values of some of the mechanical properties of the proposed tantalum carbide modifications suggest that various scientific, industrial and technological applications of TaC should be possible.

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Oxidation studies on TaC based ultra-high temperature ceramic composites under plasma arc jet exposure

Cited by 70 publications

References 56 publications

Role of Interfaces on Multi‐length Scale Wear Mechanics of TaC‐based Composites

Role of Interfaces on Multi‐length Scale Wear Mechanics of TaC‐based Composites

Fracture‐Resistant and Thermally Insulating Ultrahigh‐Temperature Carbide Foams

Structure Prediction and Mechanical Properties of Tantalum Carbide (TaC) on ab initio Level

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