Papers by Author: Qiang Song

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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: Qiang Song, Shu Qing Qin
Abstract: In the present paper, the effects of two-step annealing on the soft magnetic properties of nanocrystalline Fe73.5Cu1Nb3Si13.5B9 melt spun ribbons were studied. The two-step annealing comprises low-temperature preannealing (first step) for an α-Fe(Si) phase nucleation in an amorphous matrix, and a subsequent high-temperature annealing (second step) for the growth of precipitated crystallites. Compared with a nanocrystalline alloy obtained by conventional one-step annealing at 550 °C for 1 h, the grain size of α-Fe(Si)crystalline phase in the Fe73.5Cu1Nb3Si13.5B9 alloy decreased greatly after it is pre-annealed at 480°C for 1 h followed by annealing at 550°C for 40 min. It has been shown that the soft magnetic properties can be significantly improved by applying two-step annealing. The decrease of grain size of α-Fe(Si) crystalline phase may result from the nucleation rate increase during the crystallization of pre-annealed.
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: 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: Qiang Song, Xing Qi Qiu
Abstract: The corrosion weight loss method and polarization curve measurement were conducted to study the effects of the complex inhibitor of sodium tungstate and urotropine on the corrosion of 304 stainless steel in the 3.5% NaCl solution. The results indicated that the complex inhibitor has good synergistic inhibitory effect for stainless steel in the NaCl solution. Combining sodium tungstate and urotrpine at a total concentration of 500 mg/L, when the mass ratio of sodium tungstate to urotrpine was 7:3, the inhibitory effect was optimum. In addition, the probable inhibitory mechanism was analyzed.
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