Nanocomposites for Machining Tools

Сидоренко, Д. А.; Логинов, П.А.; Mishnaevsky, Leon; Левашов, Е. А.

doi:10.3390/ma10101171

Cited by 7 publications

(3 citation statements)

References 96 publications

(104 reference statements)

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“…The results showed that an addition of less than 0.1% concentration of CNTs increased hardness, strength, and Young’s Modulus, but led to a decrease in grain size. This was due to the binder recrystallisation process being hindered due to the nanotube particles at grain boundaries, which also prevented coating oxidation [ 5 ]. Coatings on PcBN tools are typically 2–3 μm in thickness, therefore they cannot compensate for a poor substrate with surface defects and nonhomogeneous surface roughness.…”

Section: Introductionmentioning

confidence: 99%

Ultrasonic Deposition of Carbon Nanotubes on Polycrystalline Cubic Boron Nitride Composites

2021

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Polycrystalline cubic boron nitride (PcBN) are super-hard materials with high hardness and excellent abrasive resistance, widely used in cutting tools for precision machining of automotive and aerospace parts; however, their brittle properties make them prone to premature failure. Coatings are often applied to PcBN to extend their range of applicability and durability. Conventional coating methods are limited to the thickness range of a few hundred nanometres, poor adhesion to the substrate, and limited stability under ambient conditions. To further the properties of PcBN composites, in this paper, we explore the use of ultrasonic bonding to apply thick coatings (30–80 μm) on PcBN cutting tools. For the first time, a multi-walled carbon nanotube (MWCNT) powder is preplaced on a PcBN substrate to allow an unconventional coating technique to take place. The effects of ultrasonic bonding parameters on the change of mechanical properties of the coated tools are investigated through scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), micro-hardness analyses, and white light interferometry. The structure of the carbon nanotubes is investigated through transmission electron microscopy (pre coating) and cross-section of the bonded MWCNTs is studied via focused ion beam milling and SEM to evaluate the bonding between the multi-walled nanotubes. Optimum processing windows (i.e., bonding speed, energy, and pressure) are discovered for coating MWCNTs on PcBN. Focus ion beam milling analyses revealed a relationship between consolidation parameters and porosity of MW(pCNT) bonds. The proposed method paves the way for the novel design of functional coatings with attunable properties (i.e., thickness and hardness) and therefore improved productivity in the machining of aerospace and automotive parts.

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Section: Introductionmentioning

confidence: 99%

Ultrasonic Deposition of Carbon Nanotubes on Polycrystalline Cubic Boron Nitride Composites

2021

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“…In recent years, there have been some interesting works focused on how to improve the rigidity and strength of WC‐Ni hardmetals . Inter alia, some scientists improved the mechanical performance of WC‐based hardmetals by developing submicrometer or even nanometer WC powders, and/or by mixing certain additives of high rigidity/strength into the WC matrix . Also, specific fast sintering techniques and/or grain growth inhibitors (GGIs) have been used to develop ultrafine hardmetals .…”

Section: Introductionmentioning

confidence: 99%

Spark plasma sintering of ultrafine WC‐10Ni‐ZrC hardmetals: Effects of adding ZrC nano‐powder

Ren

Wang

et al. 2020

Int J Applied Ceramic Tech

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Novel WC-Ni hardmetals with divergent adding amounts (0-9 wt%) of ZrC nanopowder were fabricated by spark plasma sintering the samples at 1350°C under a pressure of 50 MPa. Through systematic characterizations by X-ray diffraction (XRD) and scanning electron microscopy (SEM) as well as physical properties measurements, the effects of adding ZrC nano-powder on the microstructure and mechanical properties of the samples were explored. In the sintered samples with ZrC nano-powder, ZrO 2 instead of ZrC could be monitored by XRD in the detection limit. SEM observation revealed that the addition of ZrC nano-powder could suppress the grain growth of WC to a certain degree. As the adding amount of ZrC nano-powder increased, the relative density of the specimens initially rose and subsequently declined, attaining a maximum of 98.6% for the specimen with 3 wt% ZrC nano-powder. With the enhancement of the adding amount of ZrC nano-powder, the Vickers hardness of the acquired specimens initially increased and then decreased, reaching a maximum of about 1800 HV 10 for the one with 3 wt% ZrC nano-powder.As the adding amount of ZrC nano-powder increased, the measured flexural strength gradually decreased from approximately 1500 to 1100 MPa. K E Y W O R D Saddition effects, spark plasma sintering, WC-Ni hardmetals, ZrC nano-powder

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“…Carbon-fiber-reinforced polymer composites (CFRPs) have been increasingly used during the past decades due to their potential for significant weight saving [ 1 , 2 , 3 ]. Historically, thermoset resins have been used as matrix for CFRPs [ 4 , 5 , 6 ], but the requirements for thermoplastic matrix have been elevated during the past decade [ 7 , 8 , 9 ]. Compared with thermosets, thermoplastics are inherently tough [ 10 , 11 , 12 ], recyclable, and have an unlimited shelf life [ 13 ].…”

Section: Introductionmentioning

confidence: 99%

Effects of Styrene-Acrylic Sizing on the Mechanical Properties of Carbon Fiber Thermoplastic Towpregs and Their Composites

et al. 2018

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Thermoplastic towpregs are convenient and scalable raw materials for the fabrication of continuous fiber-reinforced thermoplastic matrix composites. In this paper, the potential to employ epoxy and styrene-acrylic sizing agents was evaluated for the making of carbon fiber thermoplastic towpregs via a powder-coating method. The protective effects and thermal stability of these sizing agents were investigated by single fiber tensile test and differential scanning calorimetry (DSC) measurement. The results indicate that the epoxy sizing agent provides better protection to carbon fibers, but it cannot be used for thermoplastic towpreg processing due to its poor chemical stability at high temperature. The bending rigidity of the tows and towpregs with two styrene-acrylic sizing agents was measured by cantilever and Kawabata methods. The styrene-acrylic sized towpregs show low torque values, and are suitable for further processing, such as weaving, preforming, and winding. Finally, composite panels were fabricated directly from the towpregs by hot compression molding. Both of the composite panels show superior flexural strength (>400 MPa), flexural modulus (>63 GPa), and interlaminar shear strength (>27 MPa), indicating the applicability of these two styrene-acrylic sizing agents for carbon fiber thermoplastic towpregs.

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Nanocomposites for Machining Tools

Cited by 7 publications

References 96 publications

Ultrasonic Deposition of Carbon Nanotubes on Polycrystalline Cubic Boron Nitride Composites

Ultrasonic Deposition of Carbon Nanotubes on Polycrystalline Cubic Boron Nitride Composites

Spark plasma sintering of ultrafine WC‐10Ni‐ZrC hardmetals: Effects of adding ZrC nano‐powder

Effects of Styrene-Acrylic Sizing on the Mechanical Properties of Carbon Fiber Thermoplastic Towpregs and Their Composites

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