Papers by Author: Hong Fei Sun

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Authors: Can Ming Wang, Hong Fei Sun, Qiang Song, Qiong Qiong Yan
Abstract: Coating blade wears seriously in paper coating process. Wear mechanism was analyzed in this article. A new technology of surface coating process was introduced to increase the hardness of the edge of coating blade and thus to prolong its service life. Surface coating preparing process on blade was studied and metal-ceramic compound coating prepared successfully on the edge of coating blade with AT13 (Al2O3+13%TiO2) wear resistant material by plasma spraying process. NiCrAl alloy powder was used as under coat material. Microstructure of the coating is dense. The coating bonds well with the matrix and have high hardness. Results of grain-abrasion testing show that wear-resisting property of the metal/ceramic compound coating is about 7-8 times as that of steel blade.
Authors: Can Ming Wang, Hong Fei Sun, Qiang Song
Abstract: Cr3C2-NiCr compound coating was acquired on 20 steel substrate by plasma spraying process. The microstructure of the coating is dense with low porosity. Carbide lamellartiy inlays into the nickel-base solid solution in the coating. Main phases of the coating are Cr3C2, Cr23C6, Cr7C3 and nickel-base solid solution, etc. Average microhardness of the coating is about HV0.1756.9. Microhardness of some ceramic phases in the coating is as high as HV0.11113, which helps to the improving of wear resistance of the coating. The wear-resisting property of the coating is good under grain-abrasion condition and excellent under lubricated wear condition.
Authors: Qi Fa Tian, Hong Fei Sun
Abstract: Electric arc praying technology was used to produce Fe/B-Fe coating on the carbon steel substrate. The microstructures was studied by means of scanning electronic microscope (SEM), X-ray diffraction (XRD), transmission electron microscope (TEM) and electron probe microanalysis (EPMA). Mechanical performances, wear resistance of coating were tested . The results showed that the resistance to abrasion and corrosion of Fe/B-Fe coating was respectively 16 times and 5 to 6 times higher than those of bare metal.
Authors: Hong Fei Sun, Can Ming Wang, Qiang Song, Qiong Qiong Yan
Abstract: Abrasion mechanism of thermocouple cannula is studied in this article. For different working position and condition, different material should be selected to ensure the working characteristics of thermocouple cannula. Several protection methods were introduced to prolong the sevice life of thermocouple cannula. 1. M-Al series intermetallic compound coating protection method. 2. Metal/ceramic compound coating protection method. 3. Development of new abrasion-resisting material for high temperature according to some special work conditions of thermocouple cannula. With the adoption of those new technologies, thermocouple cannula’s service life can be prolonged to 3~5 times of that untreated.
Authors: Qiang Song, Hong Fei Sun, Can Ming Wang
Authors: Hong Fei Sun, Nana Guo, Can Ming Wang, Zhong Li Li, Hai Yun Zhu
Abstract: The microstructure of high-entropy Alloys AlFeCuCoNiCrTix (x=0, 05, 1.0) with different titanium contents had been studied. The results showed that: (1) The microstructure of AlFeCuCoNiCrTix exhibited the trend from dendritic structure to eutectic-cell structure as the titanium contents increasing and spinodal decomposition, nanoprecipitation and amorphous phase can be also observed; (2) Composition segregation appeared (especially Cu) and Ti promoted the segregation of Cu; (3) Alloys was consisted of FCC and BCC, and phases gradually converted from FCC+BCC1 to FCC+BCC1+BCC2 with addition of titanium and BCC2 became the leading phase; (4) Both ordering and spinodal decomposition coincided due to the difference of atomic size and high entropy effect.
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