Methods Used for the Compaction and Molding of Ceramic Matrix Composites Reinforced with Carbon Nanotubes

Мешалкин, В.П.; Belyakov, A. V.

doi:10.3390/pr8081004

Cited by 24 publications

(5 citation statements)

References 202 publications

(203 reference statements)

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“…Injection molding is a common process for the shaping of thermoplastics [ 1 , 2 , 3 ], thermoplastic elastomers [ 4 , 5 , 6 ], composites [ 7 , 8 , 9 ], as well as metals [ 10 , 11 , 12 ] and ceramics [ 13 , 14 ]. The central concept around the method is the melting and plasticization of the material and feeding it into a mold cavity, where the material is solidified by cooling [ 15 ].…”

Section: Introductionmentioning

confidence: 99%

Sensorized Robotic Skin Based on Piezoresistive Sensor Fiber Composites Produced with Injection Molding of Liquid Silicone

2021

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Soft robotics and flexible electronics are rising in popularity and can be used in many applications. However, there is still a need for processing routes that allow the upscaling in production for functional soft robotic parts in an industrial scale. In this study, injection molding of liquid silicone is suggested as a fabrication method for sensorized robotic skin based on sensor fiber composites. Sensor fibers based on thermoplastic elastomers with two different shore hardness (50A and 70A) are combined with different silicone materials. A mathematical model is used to predict the mechanical load transfer from the silicone matrix to the fiber and shows that the matrix of the lowest shore hardness should not be combined with the stiffer fiber. The sensor fiber composites are fixed on a 3D printed robotic finger. The sensorized robotic skin based on the composite with the 50A fiber in combination with pre-straining gives good sensor performance as well as a large elasticity. It is proposed that a miss-match in the mechanical properties between fiber sensor and matrix should be avoided in order to achieve low drift and relaxation. These findings can be used as guidelines for material selection for future sensor integrated soft robotic systems.

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Section: Introductionmentioning

confidence: 99%

Sensorized Robotic Skin Based on Piezoresistive Sensor Fiber Composites Produced with Injection Molding of Liquid Silicone

2021

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“…However, on the other hand, the high hardness and brittleness of ceramic materials also make it difficult for shaping and machining. Methods such as slurry casting, dry pressing, and plastic molding have certain disadvantages [8][9][10][11]: forming complex components requires the use of molds with high geometric accuracy. Because high-precision molds are costly to manufacture and have long production runs, it is difficult to continuously improve and upgrade the product; sintered samples often require either laser processing or machining using diamond cutting tools to ensure sufficient accuracy in the dimensions and shape of the finished product; some special shapes and elements are difficult to produce using conventional molding processes, such as internal cavities, holes, and internal grooves.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Statistical Modeling for Effect of Nozzle Diameter, Filling Pattern, and Layer Height of FDM-Printed Ceramic–Polymer Green Body on Biaxial Flexural Strength of Sintered Alumina Ceramic

Smirnov,

Nikitin,

Peretyagin

et al. 2023

J. Compos. Sci.

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This paper deals with the application of statistical analysis in the study of the dependence of the flexural strength of sintered alumina (Al2O3) disks on the parameters (nozzle diameter of the printer print head, layer height, and filling pattern) of the fused deposition method (FDM) printing of ceramic–polymer filament containing 60 vol.% alumina and 40 vol.% polylactide. By means of a correlation analysis applied to the results of flexural tests, a linear relationship was found between the thickness of the printed layer and the strength of the sintered specimens. A statistically significant linear relationship was found between the geometric parameters and the weight of both printed ceramic–polymer and sintered ceramic samples, as well as the diameter of the nozzle used in the printing of the workpiece. It was found that the highest strength is achieved with a layer thickness equal to 0.4 mm, and the smallest scatter of mass values and geometric dimensions of ceramic samples is achieved using a nozzle diameter of 0.6 mm. As a result of the conducted research, linear equations allowing the prediction of changes in the geometry and mass of samples after sintering, as well as the strength properties of sintered samples, taking into account the geometry and mass of FDMed samples, were obtained.

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“…However, due to the compressibility of air, Figures 8 and 9 show that when the compressor speed increased, the forming pressure increased faster at the same time; in contrast, this trend was not apparent for the hydraulic forming process. This indicated that the hydraulic moulding method had better ability to control the forming pressure [40,41].…”

Section: Figure 13mentioning

confidence: 91%

Influence of Moulding Pressure on the Burst Pressure of Reverse-Acting Rupture Discs

Liu

Yuan

et al. 2021

Processes

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Rupture discs, also called bursting discs, are widely used in pressure vessels, pressure equipment, and pressure piping in process industries, such as nuclear power, fire protection, and petrochemical industries. To explore the relationship between the burst pressure of reverse-acting rupture discs and their production, two common manufacturing methods, air pressure moulding and hydraulic moulding, were compared in this study. Reverse-acting rupture discs that complied with the form recommended by API 520-2014 were prepared with four release diameters, and burst pressure tests were carried out. These results showed an obvious negative correlation between the forming pressure of rupture discs and their actual burst pressure for all experimental samples. Further study showed that the main reason for this correlation was a reduction in thickness at the top of the rupture disc caused by large plastic deformation during compression moulding. To explore the relationship between the thickness reduction effect and moulding method, this study defined the “relative ratio of thickness reduction” and concluded that the effect of decreasing the thickness of the rupture disc was more obvious for rupture disc substrates with less flexural rigidity. The above conclusions have important significance for guiding the control of the burst pressure of rupture discs.

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Methods Used for the Compaction and Molding of Ceramic Matrix Composites Reinforced with Carbon Nanotubes

Cited by 24 publications

References 202 publications

Sensorized Robotic Skin Based on Piezoresistive Sensor Fiber Composites Produced with Injection Molding of Liquid Silicone

Sensorized Robotic Skin Based on Piezoresistive Sensor Fiber Composites Produced with Injection Molding of Liquid Silicone

Experimental and Statistical Modeling for Effect of Nozzle Diameter, Filling Pattern, and Layer Height of FDM-Printed Ceramic–Polymer Green Body on Biaxial Flexural Strength of Sintered Alumina Ceramic

Influence of Moulding Pressure on the Burst Pressure of Reverse-Acting Rupture Discs

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