Mechanical and physical charactersations of polytetrafluoroethylene by high velocity compaction

Poitou, B.; Dore, Florence; Champomier, R.

doi:10.1007/s12289-009-0649-8

Cited by 14 publications

(9 citation statements)

References 3 publications

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“…Despite the importance of this material, PTFE parts cannot be structured from its molten state due to its high melt viscosity. , Hence, most of the conventional manufacturing methods used for thermoplastic materials such as injection molding cannot be used for PTFE processing. To overcome these major limitations, fabrication techniques based on the compaction of PTFE powders followed by sintering, machining, and paste extrusion are used to create PTFE parts. , However, these processes have high fabrication costs due to the need for custom-tooling to manufacture parts such as dies and molds. These form-restrictive and slow processes directly impact design complexity, and certain designs are either impractical or not even possible to fabricate.…”

Section: Introductionmentioning

confidence: 99%

“…To overcome these major limitations, fabrication techniques based on the compaction of PTFE powders followed by sintering, machining, and paste extrusion are used to create PTFE parts. 13,14 However, these processes have high fabrication costs due to the need for custom-tooling to manufacture parts such as dies and molds. These form-restrictive and slow processes directly impact design complexity, and certain designs are either impractical or not even possible to fabricate.…”

Section: ■ Introductionmentioning

confidence: 99%

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Direct Ink Writing of Poly(tetrafluoroethylene) (PTFE) with Tunable Mechanical Properties

Jiang

Erol

Chatterjee

et al. 2019

ACS Appl. Mater. Interfaces

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Poly(tetrafluoroethylene) (PTFE) is a unique polymer with highly desirable properties such as resistance to chemical degradation, biocompatibility, hydrophobicity, antistiction, and low friction coefficient. However, due to its high melt viscosity, it is not possible to three-dimensional (3D)-print PTFE structures using nozzle-based extrusion. Here, we report a new and versatile strategy for 3D-printing PTFE structures using direct ink writing (DIW). Our approach is based on a newly formulated PTFE nanoparticle ink and thermal treatment process. The ink was formulated by mixing an aqueous dispersion of surfactant-stabilized PTFE nanoparticles with a binding gum to optimize its shear-thinning properties required for DIW. We developed a multistage thermal treatment to fuse the PTFE nanoparticles, solidify the printed structures, and remove the additives. We have extensively characterized the rheological and mechanical properties and processing parameters of these structures using imaging, mechanical testing, and statistical design of experiments. Importantly, several of the mechanical and structural properties of the final-printed PTFE structures resemble that of compression-molded PTFE, and additionally, the mechanical properties are tunable. We anticipate that this versatile approach facilitates the production of 3D-printed PTFE components using DIW with significant potential applications in engineering and medicine.

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Section: Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Direct Ink Writing of Poly(tetrafluoroethylene) (PTFE) with Tunable Mechanical Properties

Jiang

Erol

Chatterjee

et al. 2019

ACS Appl. Mater. Interfaces

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show abstract

“…However, PTFE parts produced by molding techniques often do not meet the required dimensional tolerances and assembly requirements. In order to improve accuracy, machining such as drilling is used to further process these materials [ 6 , 7 ]. Due to the low intermolecular forces, PTFE suffers from poor creep resistance as well as low stiffness and yield stress [ 8 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Drilling Parameters on Machining Performance in Drilling Polytetrafluoroethylene

Zeng

Al-Furjan

et al. 2022

Materials

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Polytetrafluoroethylene (PTFE) plays an important role in semiconductor manufacturing. It is an important processing material for the key sealing components in the field of immersion lithography. The lack of research related to the mechanical processing of PTFE leads to many challenges in producing complex parts. This paper conducted a drilling experiment on PTFE. The effect of cutting parameters on the drilling performance was investigated. Thrust, torque, surface roughness, and drilling temperature were used to evaluate the influence of cutting parameters on drilling performance. In addition, the empirical mathematical models of thrust and torque were developed using analysis of variance (ANOVA). The results indicated that the spindle speed had the most important effect on the thrust and the feed rate had the most significant effect on the torque. The lowest values of thrust and torque were, respectively, 22.64 N and 0.12 Nm, achieved in the case of spindle speed of 5000 rev/min, and feed rate of 50 mm/min. The surface quality is also best at this cutting parameter. Studies have shown that higher spindle speeds with lower feed rates are ideal parameters for improving the drilling performance and machining quality of PTFE. In addition, it was found that the temperature differences due to different drilling depths were related to chip accumulation. Surface roughness inconsistencies at various locations in the inner wall of the hole were influenced by chip adhesion during machining. This paper provides a suggestion for optimizing cutting parameters and hole quality.

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“…e results revealed that increasing the crystalline content of PTFE restricts the formation of fibres and increases the fracture toughness of JIC fitting. In addition, Poitou [10] compared the mechanical and physical characterisations of PTFE produced by high-velocity compaction and conventional sintering. e results showed that the density, crystal weight fraction, and wear properties of PTFE made by high-velocity compaction were improved.…”

Section: Introductionmentioning

confidence: 99%

Effect of the Fabrication Technique on Compressive Properties of Cu‐PTFE Composites

Tang

Wang

Yin

et al. 2021

Advances in Materials Science and Engineering

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In this paper, the effect of manufacturing methods on the compressive properties of Cu-PTFE (polytetrafluoroethylene) composites was investigated. Two types of specimens were prepared through different manufacturing methods (extrusion forming and hot-press sintering). The specimens were tested using an electrohydraulic press and split-Hopkinson pressure bars for quasi-static loading and dynamic impact, respectively. The specific fracture processes were recorded by using a high-speed camera, and the failure microstructures of the specimens were analysed by SEM. According to the results, hot-press sintered specimens have consistently higher strength and toughness under dynamic compression than the extruded specimens, while the mechanical properties of hot-press sintered specimens are inferior to those of extruded specimens under quasi-static compression. The failure of extruded specimens is primarily caused by the elastic mismatch between the PTFE matrix and Cu particles, as well as the polymerisation of plastic pores, which leads to particle pullout. However, the cracks in the hot-press sintered specimens were caused by the shear deformation and interface sliding of the PTFE matrix, which led to matrix tearing.

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Mechanical and physical charactersations of polytetrafluoroethylene by high velocity compaction

Cited by 14 publications

References 3 publications

Direct Ink Writing of Poly(tetrafluoroethylene) (PTFE) with Tunable Mechanical Properties

Direct Ink Writing of Poly(tetrafluoroethylene) (PTFE) with Tunable Mechanical Properties

Effect of Drilling Parameters on Machining Performance in Drilling Polytetrafluoroethylene

Effect of the Fabrication Technique on Compressive Properties of Cu‐PTFE Composites

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