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Effects of metal-ceramic anticorrosion coating on the performance of ballastless tracks at high temperature

Zhang Jiwen, Jiang Hailou, Ding Feng, Zhang Pingze, Zhou Fei, Li Tao, Duan Ning

Archives of Civil and Mechanical Engineering

2020

Vol. 20, no. 4

329--342

A highly reflective metal-ceramic anticorrosion coating is proposed to address temperature-induced track arching and concomitant damage of the China Railway Track System II ballastless tracks. The term ceramic refers to the inorganic phosphate coating binder and the metal pertains to the aluminite powder filler. Its thermal properties were studied through finite element modeling and heat radiation testing of uncoated and coated concrete samples and 1:1 ballastless track slab models. The metal–ceramic anticorrosion coating microstructure and constituent characterization were considered in its cooling efficacy analysis. The insulation temperature of the concrete test pieces increased as the thickness of the primer layer increased. At a primer layer thickness of 100 μm, 200 μm, and 300 μm, the corresponding insulation temperature was 8 °C, 18 °C, and 25 °C, respectively. Moreover, the temperature gradient, longitudinal stress, and vertical displacement of a track slab coated with a 300-μm metal-ceramic anticorrosion coating layer decreased by 29%, 57%, and 51.9%, respectively, which agreed well with the simulation results. The reduction in temperature transfer to the substrate, realized by the metal-ceramic anticorrosion coating, holds great promise for application in the construction industry.

Badanie wykrywania mieszanin węglowodanów metodą nieliniowego chemicznego fingerprintu

Ding Feng, Li Jirui, She Yuanyuan, Zhang Timing, Cheng Shu, Liang Yizeng, Si Shihui

Przemysł Chemiczny

2019

T. 98, nr 1

34--40

Badano chemiczną reakcję oscylacyjną zachodzącą w roztworze kwasu siarkowego, bromianu sodu, siarczanu manganu i węglowodanów (glukoza, sacharoza, fruktoza) w celu uzyskania nieliniowych chemicznych map oscylacyjnych w różnych warunkach. Parametry fingerprintu (okres indukcji, pierwszy cykl i czas oscylacji) wykazywały regularne zmiany po dodaniu substancji organicznych. Wykazano, że nieliniowy chemiczny fingerprint (NCF) może być wykorzystywany do analizy i różnicowania węglowodanów.

Oscillation reaction in aq. soln. of H₂SO₄, NaBrO₃, MnSO₄ and glucose, sucrose (saccharose) or fructose was followed to acquire its nonlinear chem. oscillating map and det. the induction period, first cycle shape and oscillation life. The particular sugars used showed their fingerprint parameters and were recommended for practical use in chem. anal. for their differentiation.