Fabrication of Natural Flake Graphite/Ceramic Composite Parts with Low Thermal Conductivity and High Strength by Selective Laser Sintering

Wu, Haihua; Chen, Kui; Li, Yafeng; Ren, Chao; Yu, Sun; Huang, Caihua

doi:10.3390/app10041314

Cited by 7 publications

(3 citation statements)

References 28 publications

(29 reference statements)

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“…Moreover, with graphite powder, short carbon fibers, and PA12 as the constituents, the composite is most suitable for SLS processing, which facilitates the fabrication of complex functional geometries based on this composite. However, so far, very little has been reported regarding the tribological characteristics of a reinforced thermoplastic filled with a solid lubricant, and very few articles among them are concerned with composites prepared by the SLS technique [15,[24][25][26]. The few reported results showed that inclusion of either PTFE or MoS 2 could effectively reduce the coefficient of friction of laser-sintered PA12 by forming a homogenous transfer film on the counter-surface [15,27], and that a 5-10% weight fraction of graphite was sufficient to significantly improve the tribological characteristics of PA6 [24].…”

Section: Introductionmentioning

confidence: 99%

Dry Friction and Wear Behavior of Laser-Sintered Graphite/Carbon Fiber/Polyamide 12 Composite

Gadelmoula,

Aldahash

2023

Polymers

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Carbon fiber-reinforced polymers (CFRPs) are being used extensively in modern industries that require a high strength-to-weight ratio, such as aerospace, automotive, motorsport, and sports equipment. However, although reinforcement with carbon fibers improves the mechanical properties of polymers, this comes at the expense of abrasive wear resistance. Therefore, to efficiently utilize CFRPs in dry sliding contacts, solid lubricant is used as a filler. Further, to facilitate the fabrication of objects with complex geometries, selective laser sintering (SLS) can be employed. Accordingly, in the present work, graphite-filled carbon fiber-reinforced polyamide 12 (CFR-PA12) specimens were prepared using the SLS process to explore the dry sliding friction and wear characteristics of the composite. The test specimens were aligned along four different orientations in the build chamber of the SLS machine to determine the orientation-dependent tribological properties. The experiments were conducted using a pin-on-disc tribometer to measure the coefficient of friction (COF), interface temperature, friction-induced noise, and specific wear rate. In addition, scanning electron microscopy (SEM) of tribo-surfaces was conducted to specify the dominant wear pattern. The results indicated that the steady-state COF, contact temperature, and wear pattern of graphite-filled CFR-PA12 are orientation-independent and that the contact temperature is likely to approach an asymptote far below the glass transition temperature of amorphous PA12 zones, thus eliminating the possibility of matrix softening. Additionally, the results showed that the Z-oriented specimen exhibits the lowest level of friction-induced noise along with the highest wear resistance. Moreover, SEM of tribo-surfaces determined that abrasive wear is the dominant wear pattern.

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Section: Introductionmentioning

confidence: 99%

Dry Friction and Wear Behavior of Laser-Sintered Graphite/Carbon Fiber/Polyamide 12 Composite

Gadelmoula,

Aldahash

2023

Polymers

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“…Selective laser sintering (SLS) is an additive manufacturing technology initially proposed by American scholars Deckard and Beaman in 1986 [6] . Over the years, researchers have conducted extensive studies in the field of SLS, focusing on equipment development, process optimization, and material advancements within the foundry industry [7][8][9][10][11][12][13][14][15][16] .…”

Section: Introductionmentioning

confidence: 99%

Preparation of coated sand for selective laser sintering and optimization of baking process of sand moulds

Wang,

Yu,

Tan

et al. 2023

China Foundry

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A cold method was used to prepare coated sand for application in the selective laser sintering (SLS) process. Tensile strength, loss on ignition, gas evolution, and accuracy of the SLS samples were tested and analyzed, and the baking process was thoroughly investigated. Compared with coated sand prepared by the hot method, the cold method yields a more uniform and complete resin film on the sand's surface, resulting in enhanced tensile strength and accuracy. Additionally, the cold method requires a lower binder content to meet the same strength requirements, thereby minimizing gas evolution, reducing porosity defects, and ultimately improving casting quality. The coated sand samples prepared through the cold method exhibit superior accuracy, with a size error of within ±0.4 mm. In contrast, the coated sand samples prepared by the hot method display a lower accuracy, with an average negative error of 2.1993 mm. The highest tensile strength could be attained by controlling the baking temperature within a suitable range (180-190 °C), which can effectively reduce the generation of gas, thus contributing to improved overall performance.

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“…Moreover, the research group used selective laser sintering to rapidly prepare a low-density carbon-graphite/silicon carbide composite thermal insulation material and noted that a certain number of closed pores could be formed inside the material through the addition of expandable graphite (200 mesh, 1-1.5 wt%). This framework simultaneously exhibited a low thermal conductivity and high compressive strength, with values of 1.21 WÁm -1 K -1 and 13.87 MPa, respectively [11].…”

Section: Introductionmentioning

confidence: 99%

Mechanical properties and thermal conductivity of lightweight and high-strength carbon-graphite thermal insulation materials

Zhong

et al. 2022

J Mater Sci

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Thermal insulation composites are widely used in civil and military applications; however, it is difficult to achieve the synergy of multiple technical objectives such as lightweight, thermal insulation, high pressure resistance and high-temperature resistance by adopting traditional preparation techniques. In this study, a novel carbon-graphite thermal insulation material was rapidly prepared by exploiting the micro-thermal press additive manufacturing forming technology, and these multiple objectives were simultaneously achieved by introducing a large number of closed pores. It was found that the percentage of closed pores in the carbon-graphite insulation was increased by increasing the forming density or the amount of thermosetting phenolic resin added, but the thermal conductivity increased in parallel with the compressive strength, while the addition of pre-covered expandable graphite was able to achieve the synergy of high compressive strength and low thermal conductivity. When the content of thermosetting phenolic resin was 25 wt%, forming density was 1.2 g·cm−3, and expandable graphite was clad twice, the prepared carbon-graphite insulation exhibited a closed porosity/porosity ratio, compressive strength, and thermal conductivity of 48.92%, 16.432 MPa, and 0.743 W·m −1 K−1, which has the advantages of lightweight, high compressive strength, heat insulation and high-temperature resistance and has good prospects for industrial applications.

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Fabrication of Natural Flake Graphite/Ceramic Composite Parts with Low Thermal Conductivity and High Strength by Selective Laser Sintering

Cited by 7 publications

References 28 publications

Dry Friction and Wear Behavior of Laser-Sintered Graphite/Carbon Fiber/Polyamide 12 Composite

Dry Friction and Wear Behavior of Laser-Sintered Graphite/Carbon Fiber/Polyamide 12 Composite

Preparation of coated sand for selective laser sintering and optimization of baking process of sand moulds

Mechanical properties and thermal conductivity of lightweight and high-strength carbon-graphite thermal insulation materials

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