Acidic-Thermal Ageing Effect on Compression Stress Relaxation of Silicone Rubber

Li, G.; Gong, Jianming; Tan, Jinzhu; Zhu, Danshi; Jia, Wenhua; Lu, Xiaolong

doi:10.1007/s11223-019-00113-5

Cited by 8 publications

(8 citation statements)

References 21 publications

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“…Its premature degradation will inevitably lead to the decline of fuel cell sealing performance, which is easily causes leakage of the stack and disastrous consequences, especially in specific service environment such as high temperature and high pressure 10 . Therefore, the stress relaxation of seals is one of the parameters that should be focused on when studying the durability of fuel cell stacks 3,23,24 . However, due to the lack of research methods (especially in situ monitoring), there are few reports on seal the impact of stress relaxation, which must be scientifically screened before the seals are installed in a stack for the actual application.…”

Section: Resultsmentioning

confidence: 99%

“…The first is a solution that simulates the real environment of PEMFC, compositing with 12 ppm H 2 SO 4 , 1.8 ppm HF, and reagent grade water having 18 MΩ resistance, called Regular Test (RT) solution. The second is an accelerated aging test solution, compositing with 1 mol/L H 2 SO 4 , 10 ppm HF, and reagent grade water having 18 MΩ resistance, called Accelerated Degradation Test (ADT) solution 15,17,18,23 …”

Section: Experiments and Methodsmentioning

confidence: 99%

“…The hardness of silicone rubber was not listed separately as no significant variation in hardness was observed prior and after the experiment. 15,17,18,23 As displayed in Figure 1, the fixture that applied stress to the sealant sample was customized with polytetrafluoroethylene (PTFE), a material with excellent corrosion resistance to prevent container contamination from interfering with the experiment. A tailor-made 3 L PTFE lined reaction kettle was used as the container, whose inner layer was stainless steel with a thickness of 10 mm.…”

Section: Methodsmentioning

confidence: 99%

“…10 Therefore, the stress relaxation of seals is one of the parameters that should be focused on when studying the durability of fuel cell stacks. 3,23,24 However, due to the lack of research methods (especially in situ monitoring), there are few reports on seal the impact of stress relaxation, which must be scientifically screened before the seals are installed in a stack for the actual application.…”

Section: Compression Stress Relaxationmentioning

confidence: 99%

“…The results revealed that SR and EPDM exhibited the best performance and stability. Afshin et al, 20 Wang et al, 21 Wu et al, 22 and Li et al 23,24 reported the aging and degradation of silicone rubber in acidic solutions under different hydrothermal conditions. The silicone rubber surface gradually erodes with increasing temperature and time, followed by deterioration of its mechanical properties, which may be exaggerated with increasing aging solution concentration.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Screening of sealing materials for PEM fuel cell applications based on weight factor method

Yao,

Yang,

et al. 2023

J of Applied Polymer Sci

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The inexpensive, endurable sealing members are among the key components determining the performance and durability of proton exchange membrane fuel cells (PEMFCs). However, there is a lack of effective in situ measurement to monitor the sealing performance change in the fuel cell operation environment. Therefore, the durability of a sealing material should be assessed previously to its application. The present work investigates four types of commercially available sealing silicone rubbers, and five groups of aging tests are carried out to compare their properties and durability in a simulated PEMFC environment, including compression set, stress relaxation, compression stress–strain, solution soaking, and low‐temperature characterization. Furthermore, to comprehensively evaluate the performance of these four types of silicone rubbers and screen out the most suitable one, a comprehensive evaluation table of sealing materials selection based on weight factor was established through an expert survey method, by which the experimental results of all the silicone rubbers can be weighted and scored. This method can be widely used in the fuel cell industry.

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Section: Resultsmentioning

confidence: 99%

Section: Experiments and Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Compression Stress Relaxationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Screening of sealing materials for PEM fuel cell applications based on weight factor method

Yao,

Yang,

et al. 2023

J of Applied Polymer Sci

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Sealing Performance of Ethylene Propylene Diene Monomer Seals for Proton Exchange Membrane Fuel Cells

Xiaohui,

Lei,

et al. 2024

Energy Tech

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The reliability of the sealing system of a proton exchange membrane fuel cell (PEMFC) is a prerequisite for ensuring the efficient and safe operation of the cell stack. In consideration of the actual assembly process, a local model of single‐cell sealing structure is constructed using a rounded corner rectangular sealing gasket structure. Apart from that, the effects of fluid pressure, bipolar plate offset, sealing gasket size, steady‐state temperature field, and seal structure on the sealing performance of PEMFC are investigated. As shown by results, with the increase of fluid pressure and sealing gasket width, the contact pressure is increased and the sealing performance is also improved. However, the increase of sealing gasket height is unfavorable to the stability and sealing performance of the stack. Meanwhile, excessive offset error leads to a sharp decrease in contact length and contact pressure at the sealing interface, which reduces the stability of the stack. With the increase of the operating temperature, the thermal expansion of the gasket increases and the contact performance improves significantly. Seals with rectangular structure have some advantages in terms of contact stability and standard deviation of contact pressure.

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Sealing performance and mechanical behavior of PEMFCs sealing system based on thermodynamic coupling

Zhang

2020

International Journal of Hydrogen Energy

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Acidic-Thermal Ageing Effect on Compression Stress Relaxation of Silicone Rubber

Cited by 8 publications

References 21 publications

Screening of sealing materials for PEM fuel cell applications based on weight factor method

Screening of sealing materials for PEM fuel cell applications based on weight factor method

Sealing Performance of Ethylene Propylene Diene Monomer Seals for Proton Exchange Membrane Fuel Cells

Sealing performance and mechanical behavior of PEMFCs sealing system based on thermodynamic coupling

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