Research on high temperature friction properties of PTFE/Fluorosilicone rubber/silicone rubber

Qi, Ming; Jia, Xianzhao; Wang, Guangfei; Xu, Zehua; Zhang, Yong; He, Qiang

doi:10.1016/j.polymertesting.2020.106817

Cited by 32 publications

(12 citation statements)

References 9 publications

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“…First of all, according to different materials and devices, the temperature selected is different. For example, the white LED is 85-125 ℃ [7-8], the GaN based device is 85 ℃ [9], the In Pb material is 150 ℃ [10], the erbium ytterbium co doped ber ampli er is 85 ℃ [11], the organic material uorosilicone rubber is 200 ℃ [12], the InGaAs photodiode is 100-300 ℃ [13], and the MEMS gyroscope is 125 ℃ [14]. In general, the in uence of high temperature treatment on devices is mainly re ected in the in uence of temperature stress on electron mobility, which leads to the formation of voids or metal compounds in materials, which changes the electrical properties, the oxidation of metals caused by the presence of air oxygen, and the degradation of electrical and thermal properties caused by the denaturation of packaging materials.…”

Section: High Temperature Annealingmentioning

confidence: 99%

Study on transient photocurrent induced by energy level defect of schottky diode irradiated by high power pulsed laser

Wang

et al. 2023

Preprint

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The transient photocurrent is one of the key parameters of the spatial radiation effect of photoelectric devices, and the energy level defect affects the transient photocurrent. In this paper, by studying the deep level transient spectrum of a self-designed Schottky diode, the defect properties of the interface region of the anode metal AlCu and Si caused by high-temperature annealing at 150 ℃, 200 ℃ and 300 ℃ for 1200 h have been quantitatively analyzed. The study shows that the defect is located at the position of + 0.41 eV on the valence band, the concentration is 2.8×1013/cm2, and the capture cross section is σ = 8.5×1017. The impurity energy level mainly comes from the diffusion of Al atom in anode metal. We found that the defect did not cause the electrical performance degradation and obvious morphology change of the device, but the transient photocurrent increased significantly. The reason is that the high temperature treatment results in a growth in the density of states at the interface between AlCu-Si. The more mismatched dislocations and recombination center increased the reverse current of the heterojunction. The above view is proved by the TCAD simulation test.

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Section: High Temperature Annealingmentioning

confidence: 99%

Study on transient photocurrent induced by energy level defect of schottky diode irradiated by high power pulsed laser

Wang

et al. 2023

Preprint

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“…Even if there is great difficulty in working together, they can reduce phase separation through high-strength physical interactions . In recent years, research on fluororubber and silicone rubber has been actively carried out, − and their composite materials have also appeared. , Sipra Khanra added fluorosilicone rubber and modified silica filler to a combination of fluorosilicone rubber and silicone rubber in different fillers. It could be found that the two are compatible and the mixture can be used in a wide range of applications as a sealing system scope, including oil- and fuel-resistant O-rings and seals.…”

Section: Introductionmentioning

confidence: 99%

Preparation of High-Strength and Excellent Compatibility Fluorine/Silicone Rubber Composites under the Synergistic Effect of Fillers

et al. 2023

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Fluorine/silicone composite rubber is widely used as a sealing material in aerospace, missile, automotive, petroleum, and other industries, but the traditional process does not use synergistic fillers to strengthen the composite system. In this research, fumed SiO2 and black caron (N990) were used as synergistic fillers, fluorine/silicone composite rubber was prepared by mechanical mixing process, and three different fluorine rubber systems were used to find the best composite material. The mechanical properties, thermal properties, aging properties, moderate strength properties, and microstructure of the composites were evaluated. Studies have shown that mixing the two can produce a certain interface interaction and effectively improve the compatibility. The physical properties of the material tended to decrease during the increase in the added amount of silicone rubber (MVQ). The maximum tensile strength of the hybrid material can reach 15 MPa. The optimal mixing ratio is fluororubber/silicone rubber (FKM/MVQ) = 9/1. At this time, the mechanical properties of the composite material are in the best state, and SiO2 and black caron (N990) have a reinforcing effect, which can effectively improve the mechanical properties. After the composite was kept at 200 °C for 48 h, the tensile strength and elongation of the best sample A1 were 99.5 and 97.0%, respectively, showing excellent anti-aging properties. This work provides a method to fabricate high-strength fluorine/silicone composites using synergistic fillers that may be used in heat-medium-sealed environments.

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“…Therefore, many researchers have combined organic silicone and organic fluorine to try to increase the hydrophobicity of the material without sacrificing its flexibility of the material. 16,17 In recent years, some researchers have successfully prepared fluorosilicone materials with excellent hydrophobicity and flexibility by introducing fluorinecontaining groups into polymethylhydrosiloxane. [18][19][20] For example, Wu et al introduced fluorinated side chains into WPU through the click reaction.…”

Section: Introductionmentioning

confidence: 99%

“…With the development of organic fluorine materials, it has been found that fluorine‐containing fragments are enriched and migrate to the surface during the organic fluorine film formation, thereby reducing the surface energy of the film. Therefore, many researchers have combined organic silicone and organic fluorine to try to increase the hydrophobicity of the material without sacrificing its flexibility of the material 16,17 . In recent years, some researchers have successfully prepared fluorosilicone materials with excellent hydrophobicity and flexibility by introducing fluorine‐containing groups into polymethylhydrosiloxane 18–20 .…”

Section: Introductionmentioning

confidence: 99%

Perfluoropolyether methyl propionate polysiloxane coating with high hydrophobicity and low dielectric property

et al. 2023

J of Applied Polymer Sci

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Developing materials with a combination of superior properties such as hydrophobicity and low dielectric is very challenging. This work proposes a design strategy based on the synergistic effect of silicon fluorine to fabricate fluorous silicon materials with excellent hydrophobicity and dielectric properties. Perfluoropolyethyl propionate polysiloxane (PEPS) with different grafting ratios was synthesized by the reaction of polymethylhydrosiloxane (PMHS) and perfluoropolyethyl methacrylate (PPM) hydrosilane. The self-crosslinking perfluoropolyether methyl propionate polysiloxane (PFSP) coating with good hydrophobicity and low dielectric was prepared by further introducing triethoxyvinylsilane (TOVS) into the PEPS and condensing. The fluorine content of two interfaces (film PET and film air) of PFSP-4 film was analyzed by XPS, and it was found that the fluorine content of the film air interface was 46.19% and that of the film PET interface was 17.3%. With the increase of perfluoropolyether content in PFSP, fluorine-containing groups migrate to the coating surface, which is more conducive to enhancing the hydrophobicity of the coating. The results indicate that the film has excellent hydrophobicity with a high water contact angle of up to 117 due to the introduction of PPM. In addition, the dipole moment of perfluoropolyether methyl methacrylate is 2.27, which is lower than that of methyl. Therefore, the introduction of a large number of perfluoropolyether bonds effectively reduces the polarity of the material, which is beneficial to its low dielectric properties. The dielectric constant of PFSP-4 is 2.4, which is 33% lower than that of a fluorine-free silicone coating. The results show that the self-crosslinking perfluoropolyether methacrylate polysiloxane coating has excellent hydrophobicity and low dielectric properties, so it has a feasible application prospect in the electronic industry.

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Research on high temperature friction properties of PTFE/Fluorosilicone rubber/silicone rubber

Cited by 32 publications

References 9 publications

Study on transient photocurrent induced by energy level defect of schottky diode irradiated by high power pulsed laser

Study on transient photocurrent induced by energy level defect of schottky diode irradiated by high power pulsed laser

Preparation of High-Strength and Excellent Compatibility Fluorine/Silicone Rubber Composites under the Synergistic Effect of Fillers

Perfluoropolyether methyl propionate polysiloxane coating with high hydrophobicity and low dielectric property

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