Acidic-Thermal Ageing Effect on Compression Stress Relaxation of Silicone Rubber
- 8 Downloads
The compression properties of silicone rubbers used as gaskets in PEM fuel cells are studied. The specimens are aged under different test conditions, viz, high temperature, humid air, and acidic solutions, prepared to match real PEM fuel cell operation conditions. The compression and stress relaxation tests are conducted. Temperature, humid air and acidic solution exert a serious effects on the mechanical performance of silicone rubbers. All the three factors can cause an increase in the stress relaxation modulus and permanent compression deformation. The effects of high temperature and an acidic solution are more pronounced. This can accelerate the deterioration of mechanical properties and decrease the sealing efficiency of gaskets, which would influence the durability of PEM fuel cells. It creates the basis for life prediction of silicone rubbers under appropriate accelerated durability test conditions.
Keywordsstress relaxation compression silicone fuel cell
This study was sponsored by the National Natural Science Foundation of China (Nos. 51505212, 51505211, and 11302097) and Open Research Fund of Jiangsu Collaborative Innovation Center for Smart Distribution Network, Nanjing Institute of Technology, China (No. XTCX201609).
- 3.G. Li, J. Z. Tan, J. M. Gong, and W. H. Jia, “Degradation mechanism of the silicone rubber in simulated PEM fuel cell environments,” J. Chem. Ind. Eng. (China), 65, No. 9, 3669–3675 (2014).Google Scholar
- 9.T. Cui, Y. J. Chao, and J. W. Van Zee, “Stress relaxation behavior of a liquid silicone rubber seal subjected to temperature cycling,” J. Electrochem. Soc., No. 16, 1037–1037 (2011).Google Scholar
- 23.GB/T 7759.1-2015. Rubber, Vulcanized or Thermoplastic – Determination of Compression Set – Part 1: At Ambient or Elevated Temperatures, National Standards of People’s Republic of China (2015).Google Scholar
- 24.GB/T 1685-2008. Rubber, Vulcanized or Thermoplastic – Determination of Stress Relaxation in Compression at Ambient and at Elevated Temperatures, National Standards of People’s Republic of China (2008).Google Scholar