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

Nisar, Ambreen; Balani, Kantesh

doi:10.1002/adem.201600713

Cited by 26 publications

(2 citation statements)

References 36 publications

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“…50 This could assist in crack-mitigation under extreme dynamic loading conditions. The evidence of dislocation tangles, low angle grain boundaries, stacking faults during SPS processing in carbides such as TaC and SiC has previously been reported, [51][52][53][54] which shows that there is a tendency of plastic deformation in a MC-UHTC system. As the diffusion rate is faster in MC-UHTCs (see Table 1), the dislocation glide through the lattice (leading to lattice distortion, see Figure 2) may cause one plane to slip over another entailing plastic deformation in the system.…”

Section: Mechanical Integrity and Localized Ductility In Mc-uhtcsmentioning

confidence: 77%

Unveiling enhanced oxidation resistance and mechanical integrity of multicomponent ultra‐high temperature carbides

et al. 2021

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The development of a new class of multicomponent ultra-high temperature ceramics (MC-UHTCs), often referred to as high-entropy UHTCs, has gained increased interest due to the possibility of improved thermomechanical and oxidation properties. In this study, a systematic approach by gradual addition in the UHTC components ranging from a binary to a dense quaternary (Ta,Nb,Hf,Ti)C is synthesized using spark plasma sintering (SPS). The solid solutioning was the critical factor in homogenizing the composition in the multicomponent system. The segregation of NbC and HfC was seen in binary and ternary UHTC systems, while a single-phase homogeneity was observed in the quaternary UHTC improving its hardness up to 34.8 GPa. The presence of closely spaced slip lines in the MC-UHTCs enhances resistance to indentation damage up to 72% at an applied load of 200 N. The formation of complex mixed oxide phase of Hf 6 Ta 2 O 17 ensued in the lower to negligible oxidation even up to 3 min of plasma exposure with temperature exceeding 2800 • C. In sum, though the entropy remains medium (0.96R) for the selected system, the quaternary UHTC system undoubtedly has significantly better thermomechanical performance when compared to established baseline UHTCs. This raises the debate on the justification for calling a multicomponent system a "high entropy" to be seen in a new light. The developed MC-UHTCs elicits the paradigm of this new class of UHTCs expanding their potential in thermal protection systems for hypersonic applications.

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Section: Mechanical Integrity and Localized Ductility In Mc-uhtcsmentioning

confidence: 77%

Unveiling enhanced oxidation resistance and mechanical integrity of multicomponent ultra‐high temperature carbides

et al. 2021

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“…[43][44][45] However, as of now, only a single study has been carried out in the field of UHTCs on Tantalum Carbide-based composites, connecting wear at two different length scales (micro-wear using fretting and meso-wear using micro-scratch). [46] Based on these lacunae in the literature, this study investigates the reinforcement (SiC) size effect on the tribological properties of ZrB 2 at different length scales for the first time.…”

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Engineered Role of SiC Particle Size on Multi‐Length‐Scale Wear Damage of Spark Plasma Sintered Zirconium Diboride

Hassan

Balani

2020

Adv Eng Mater

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Among all the members from different families of ultra-high temperature ceramics (UHTCs), including borides, carbides, and nitrides, zirconium diboride (ZrB 2) is a special one, [1] possessing extraordinary combination of properties, [2-4] such as high mechanical properties viz. hardness (15-29.4 GPa [5-8]), fracture toughness (2.8-4 MPa m 1/2[6,9,10]), high thermal conductivity (57.9-60 W m À1 K À1[11,12]), low electrical resistivity (9.2-10 μΩ cm [13,14]), and also low density (6.1 g cm À3[7,15]). However, for hypersonic applications, hardness, fracture toughness, and tribological properties need to be improved, and the density of monolithic ZrB 2 needs to be reduced further to produce maneuverable hypersonic vehicles. [16] Moreover, poor sinterability of UHTCs, in general, and, thus, in ZrB 2 , due to its strong covalent bonding, adherence of oxide impurities on its particles' surface, and poor self-diffusivity, has always been a matter of concern. [17,18] In this context, reinforcement with a suitable secondary phase, such as SiC, B 4 C, ZrC, and MoSi 2 , has improved not only densification but also mechanical properties, such as hardness and fracture toughness, oxidation resistance, thermal properties, and wear resistance as well. [16,18-21] Among these reinforcements, B 4 C and SiC possess low density (2.52 and 3.16 g cm À3 , respectively [16,22]) and are attracting more interest in enhancing the performance of UHTCs. Enormous research has been carried out to study the effect of reinforcements on the mechanical, oxidation, and thermal performance of ZrB 2. SiCreinforced ZrB 2 composites have received special interest, [23-25] considered as baseline UHTC composites [17,26-29] with 20 vol% SiC as optimal for aerospace applications; [30-33] however, studies regarding the effect of reinforcement on tribological behavior are available in scarce as compared with studies on other aspects, such as mechanical, thermal, and oxidation behavior. One of the earliest studies on the friction and wear of hot pressed (2100 C for 1 h at 34.3 MPa in Ar) ZrB 2-based composites carried out by Umeda et al. [34] in the 1990s showed the coefficient of friction (cof) varied between 0.90 and 0.95. With an increase in relative humidity (RH; from <10 to >70%), cof decreased to 0.2-0.4. The tests were performed in air using reciprocating pin-on-block instrument with pin and block of the same material at 7.8 N load and a sliding speed of 1.5 mm s À1 for 100 cycles. Hertzian cracks were formed perpendicular to the sliding direction in ZrB 2 and ZrB 2 þ B 4 C (50:50 wt%) composite, whereas no cracks developed in the ZrB 2 þ B 4 C þ SiC (46:46:8 wt%) composite, revealing the effective role of synergetic reinforcement of B 4 C and SiC in toughening the ZrB 2 matrix. Recently, Medveď et al. [35] processed ZrB 2-based composites viz. ZrB 2 þ 10 wt% B 4 C, ZrB 2 þ 10 wt% SiC, and ZrB 2 þ 10 wt% ZrC via spark plasma sintering (SPS; sintered from 1800 to 2050 C at 50 MPa for 10 min in Ar) to study the tribological behavior of carbide reinforceme...

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Carbon nanotube functionalization supports mechanical, tribological, and biological response of freeze‐dried ultra‐high molecular weight polyethylene‐based bio‐composites

Rani,

Singh,

Khare

et al. 2024

J of Applied Polymer Sci

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Acetabular cup liners made of ultra‐high molecular weight polyethylene (UHMWPE), in hip implants fail mostly due to wear debris generation and poor wear resistance. Consequently, strengthening UHMWPE becomes essential. The current work exhibits how the addition of 5 vol% carbon nanotubes (CNT) and functionalized carbon nanotubes (fCNT) in UHMWPE (denoted as U) affects the mechanical properties (hardness, elastic modulus) and tribological properties (wear resistance) of biocomposites. To form a composite, powders were mixed using a planetary centrifugal mixer followed by freeze‐drying to disperse‐CNTs, followed by its compression molding at 220°C for 1 h at 10 MPa. With the addition of CNT and fCNT, ≥95% densification was obtained for all samples resulting an increase in hardness and elastic modulus from 74.96 MPa to 168.11 MPa (124%) and 1.65 GPa to 2.96 GPa (79%), respectively, which led to the reduction in wear rate from 12.5 × 10−5 mm3/Nm (U) to 2.5 × 10−5 mm3/Nm (UfCNT). The amount of apatite formation enhanced from U (58.2%) to UfCNT (65.1%) is confirmed via X‐ray diffraction and X‐ray photoelectron spectroscopy. Cell proliferation studies have validated the cytocompatible efficacy of U‐CNT composites with osteoblast‐like MG‐63 cells, making UfCNT as potential material for acetabular cup liners.

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

Cited by 26 publications

References 36 publications

Unveiling enhanced oxidation resistance and mechanical integrity of multicomponent ultra‐high temperature carbides

Unveiling enhanced oxidation resistance and mechanical integrity of multicomponent ultra‐high temperature carbides

Engineered Role of SiC Particle Size on Multi‐Length‐Scale Wear Damage of Spark Plasma Sintered Zirconium Diboride

Carbon nanotube functionalization supports mechanical, tribological, and biological response of freeze‐dried ultra‐high molecular weight polyethylene‐based bio‐composites

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