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Damping Capacity and Creep Resistance of Spray Deposited High Silicon Alloy ZA27

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Journal of Materials Science & Technology 1998年第2期14卷 115-120页

作者： Liu, Yongchang yang, Gencang Lu, Yili yang, liushuan Northwestern Polytech Univ State Key Lab Solidificat Proc Xian 710072 Peoples R China Luoyang Inst Technol Dept Mat Sci & Technol Luoyang 471039 Peoples R China

Alloying and spray deposition technique were adopted to improve the the service temperature limitation of the alloy ZA27 in an effort to develop a new functional material with high damping capacity and good elevated temperature mechanical property. The effects of addition of 5 wt pct of Si on the damping behavior and elevated temperature creep resistance of alloy ZA27 were investigated. The damping capacity, as well as the relative dynamic modulus, were measured at frequency of 1.4 Hz over the 303 to 573 K. No peak phenomenon was observed for the specimens tested in the temperature range of interest. Experimental results indicate that the damping capacity of the deposited material is 2.8 times higher than that of the cast one at 305 K. The ball hardness values were used to evaluate the creep property and the creep activation energy of the deposited material is 3.9-5.7 kJ per mol higher than that of the as-cast one. The creep rate formulation was also derived. Finally, The operative damping and creep mechanisms were discussed in the light of the data obtained from its characterization of microstructure, damping capacity and creep resistance. (Edited author abstract) 12 Refs.

关键词： Zinc alloys

Preparation of calcium sulfate whiskers from FGD gypsum via hydrothermal crystallization in the H_2SO_4-NaCl-H_2O system

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Particuology 2014年第6期12卷 42-48页

作者： Xiao Wang liushuan yang Xinfeng Zhu Jiakuan yang School of Environmental Science and Engineering Huazhong University of Science and Technology(HUST) Department of Civil and Material Engineering Henan University of Urban Construction

Little attention has thus far been paid to the potential effect of solution composition on the hydrothermal crystallization of calcium sulfate whiskers prepared from flue-gas desulfurization（FGD） *** purified FGD gypsum was used as raw material,the morphology and phase structure of the hydrothermal products grown in pure water,H2SO4-H2O,NaCl-H2O,and H2SO4-NaCl-H2O solutions as well as the solubility of purified FGD gypsum in these solutions were *** results indicate that calcium sulfate whiskers grow favorably in the H2SO4-NaCl-H2O *** prepared using 10-70 g NaCl/kg gypsum-0.01 M H2SO4-H2O at 130 ℃ for 60 min,the obtained calcium sulfate whiskers had diameters ranging from 3 to 5 ｜xm and lengths from 200 to 600 ｜xm,and their phase structure was calcium sulfate hemihydrate（HH）.Opposing effects of sulfuric acid and sodium chloride on the solubility of the purified FGD gypsum were *** the co-presence of sulfuric acid and sodium chloride in the reaction solution,the concentrations of Ca2＋ and SO42- can be kept relatively stable,which implies that the crystallization of the hydrothermal products can be controlled by changing the concentrations of sulfuric acid and sodium chloride.

关键词： FGD gypsum Calcium sulfate whisker Hydrothermal crystallization Solution composition

CREEP　CHARACTERISTICS　OF　HIGH　SILICON　ZA27　ALLOY　PREPARED　BY　SPRAY　DEPOSITION

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中国有色金属学会会刊：英文版 1996年第2期6卷 95-100页

作者： yang liushuan Liu Yongchang yang Gencang Zhou Yaohe(State Key Laboratory of Solidification Processing,Northwestern Polytechnic University, Xi’an, 710072) State Key Laboratory of Solidification Processing Northwestern Polytechnic University Xi'an 710072 China

ＣＲＥＥＰＣＨＡＲＡＣＴＥＲＩＳＴＩＣＳＯＦＨＩＧＨＳＩＬＩＣＯＮＺＡ２７ＡＬＬＯＹＰＲＥＰＡＲＥＤＢＹＳＰＲＡＹＤＥＰＯＳＩＴＩＯＮＹａｎｇＬｉｕｓｈｕａｎ；ＬｉｕＹｏｎｇｃｈａｎｇ；ＹａｎｇＧｅｎｃａｎｇ；Ｚｈｏ... 详细信息

ＣＲＥＥＰＣＨＡＲＡＣＴＥＲＩＳＴＩＣＳＯＦＨＩＧＨＳＩＬＩＣＯＮＺＡ２７ＡＬＬＯＹＰＲＥＰＡＲＥＤＢＹＳＰＲＡＹＤＥＰＯＳＩＴＩＯＮＹａｎｇＬｉｕｓｈｕａｎ；ＬｉｕＹｏｎｇｃｈａｎｇ；ＹａｎｇＧｅｎｃａｎｇ；ＺｈｏｕＹａｏｈｅ（ＳｔａｔｅＫｅｙＬａ...

关键词： spray deposition zinc-based alloy creep, microstructure

FRICTION－WEAR　PROPERTY　OF　HIGH　SILICON　ZA27　ALLOY　PREPARED　BY　SPRAY　DEPOSITION

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中国有色金属学会会刊：英文版 1996年第4期6卷 105-109页

作者： yang liushuan Liu Yongchang yang Gencang Zhou Yaohe (State Key Laboratory of Solidification Processing,Northwestern Polytechnic University,Xi’an 710072) State Key Laboratory of Solidification Processing Northwestern Polytechnic University Xi'an 710072 China

ＦＲＩＣＴＩＯＮ－ＷＥＡＲＰＲＯＰＥＲＴＹＯＦＨＩＧＨＳＩＬＩＣＯＮＺＡ２７ＡＬＬＯＹＰＲＥＰＡＲＥＤＢＹＳＰＲＡＹＤＥＰＯＳＩＴＩＯＮ￥ＹａｎｇＬｉｕｓｈｕａｎ；ＬｉｕＹｏｎｇｃｈａｎｇ；ＹａｎｇＧｅｎｃａｎｇ；Ｚ... 详细信息

ＦＲＩＣＴＩＯＮ－ＷＥＡＲＰＲＯＰＥＲＴＹＯＦＨＩＧＨＳＩＬＩＣＯＮＺＡ２７ＡＬＬＯＹＰＲＥＰＡＲＥＤＢＹＳＰＲＡＹＤＥＰＯＳＩＴＩＯＮ￥ＹａｎｇＬｉｕｓｈｕａｎ；ＬｉｕＹｏｎｇｃｈａｎｇ；ＹａｎｇＧｅｎｃａｎｇ；ＺｈｏｕＹａｏｈｅ（ＳｔａｔｅＫｅｙ...

关键词： spray deposition zinc-based alloy tribology microstructures

Effects of Austenite Stabilization on the Onset of Martensite Transformation in T91 Steel

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Journal of Materials Science & Technology 2008年第2期24卷 202-206页

作者： Baoqun NING Yongchang LIU Qingzhi SHI Zhiming GAO liushuan yang College of Materials Science and Engineering Tianjin University Tianjin 300072 China School of Materials Science and Engineering Tianjin University of Technology Tianjin 300191 China Pingdingshan Institute of Technology Pingdingshan 467001 China

The influences of thermal stabilization of austenitic on the onset temperature for a martensite transformation in T91 ferritic heat-resistant steel were studied by high-resolution differential dilatometer. The phase transformation kinetic information was obtained by adopting lever rule from the recorded dilatometric curves. The results show that an inverse stabilization, featured by the damage of ＂the atmosphere of carbon atoms＂ and the increase of the starting temperature for martensite transformation takes place when the T91 ferritic steel is isothermally treated above the Ms point, and it becomes strong with increasing the holding time. While the continued temperature for martensite transformation decreases gradually when isothermally holding at a temperature below Ms point. The observed inverse stabilization behavior could be attributed to the relatively high temperature of Ms point in the explored T91 ferritic heat-resistant steel.

关键词： T91 ferritic heat-resistant steel Austenitic thermal stabilization Martensite Microstructure

CREEP PROPERTIES OF HIGH SILICON ALLOY ZA27 PREPARED BY SPRAY DEPOSITION

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Acta Metallurgica Sinica(English Letters) 1996年第2期9卷 140-146页

作者： yang liushuan LIU Yongchang yang Gencang ZHOU Yaohe(State Key Laboratory of Solidification Processing,Northwestern Polytechnic University,Xi’an,710072,China) Northeast Polytechnic Univ Xi'an China

The elevated temperature creep properties(90-150℃) of high silicon(～6wt%Si) alloy ZA27 prepared by spray deposition have been investigated by means of ball hardness testing *** results indicate that the creep properties of the material prepared by spray deposition are notably improved,compared to that of the conventional casting alloy *** creep activation energy of the spray deposited alloy ZA27 is 3.9-5.7 kJ/mol higher than that of the conventional casting alloy *** creep formulation in this experiment is also derived as follows:HB-2-HB0-2=K exp(- Q/3RT)(t1/3-t01/3)The reasons for the improvement of creep resistance are also discussed from a microstructural point of view.

关键词： spray deposition zinc-based alloy creep microstructure

Structural characteristic and formation mechanism of hemihydrate calcium sulfate whiskers prepared using FGD gypsum

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Particuology 2022年第3期20卷 98-103页

作者： Xiaoting Zhang Lingwei Ran Xiao Wang Biao Jin Jianwu Zhang Shanying Li liushuan yang Department of Civil&Material Engineering Henan University of Urban ConstructionPingdingshan 467036HenanChina不详

Hemihydrate calcium sulfate whiskers(HH-CSWs)were hydrothermally synthesized in a sulfuric acid solution at 120℃ for different holding times(20,40,and 60 min).The phase structures and morphologies were characterized by XRD and SEM,*** XRD pattern of the sample under 60 min was refined via the Rietveld fitting *** structure models of the HH-CSW sample under a 60-min holding time was established based on Rietveld fitting *** difference in the positions of diffraction peaks was *** as-prepared holding time increased the intensity and aspect ratio of the diffraction peaks of both *** the prepared HH-CSW structure,Ca-O polyhedron is a 12-sided polyhedron similar to that in the gypsum structure;the Ca atom is located in two positions in the one-unit cell;the H_(2)O channel along the c-axis similar is O-shaped and bigger than that in hexagonal and monoclinic CaSO_(4)·0.5H_(2)O ***,although the prepared HH-CSW crystals’structure are similar to that of the reported hexagonal and monoclinic CaSO_(4)·0.5H_(2)O structures,they are not the *** formation mechanism of HH-CSW from flue gas desulfurization(FGD)gypsum is discussed based on the analysis of gypsum structure.

关键词： FGD gypsum HH-CSW Rietveld method Crystal structure

A readily monitored and controllable hydrothermal system for the facile,cost-effective transformation of FGD gypsum to calcium sulfate hemihydrate whiskers

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Particuology 2021年第1期19卷 173-180页

作者： Bolun Cao Xiao Wang Xiaoting Zhang Biao Jin Zhuoyue Xu Xueping Liu Wei Zhang liushuan yang College of Materials Science and Engineering Zhengzhou UniversityZhengzhou 410001China School of Materials and Chemical Engineering Henan University of Urban ConstructionPingdingshan 467036China Zhengzhou Key Laboratory of Water Resource and Environment Zhengzhou450001China

The controllable transformation of flue gas desulfurization(FGD)gypsum to calcium sulfate hemihydrate(HH)whiskers under facile,readily monitored,and cost-effective hydrothermal conditions could play a vital role in the preparation of high quality HH whiskers and improve our understanding of the transformation *** work assessed the conversion of FGD gypsum to HH whiskers in 5×10^(-4)mol/L H_(2)SO_(4)and 1.5 wt%CuCl_(2)at 120℃while determining the effects of temperature as well as H_(2)SO_(4)and CuCl_(2)concentrations on transformation *** preparation of HH whiskers was found to involve a solution-mediated transformation from the dihydrate(DH)to theα-*** transition was determined to proceed via a dissolution crystallization mechanism,the rate of which was controlled by nucleation and growth of the HH *** autocatalytic kinetic model was established based on variations in the HH whiskers mole fraction over time,and this model accurately fit the experimental data with R2=*** the temperature or H_(2)SO_(4)concentration accelerated the transformation by modifying the super-saturation and water activity in the reaction solution,while increasing the CuCl_(2)concentration had the opposite *** hydrothermal conditions had an important effect on the transformation from FGD gypsum to HH whiskers.

关键词： FGD gypsum Whisker Hydrothermal condition Transformation process Kinetic

Phase Transformation and Mechanism of Cordierite Ceramic Powders Prepared by Gangue

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China's Refractories 2012年第4期21卷 32-37页

作者： WANG Xiao yang liushuan LIU Yiran ZHENG Donglai Department of Materials & Civil Engineering Henan University of Urban Construction School of Materials Science & Engineering Henan University of Science and Technology Sinosteel Luoyang Institute of Refractories Research Co. Ltd.

Cordierite ceramic powders were prepared by solid reaction at low temperatures using gangue as main starting material and adjusting component oxides in formulations. The powders were characterized by XRD, SEM and EDS. The emphasis was placed on the reaction mechanism and phase transformation of synthesized powders. The results show that cordierite ceramic powders can be synthesized at 1 150 - 1 250 % for 3 - 5 h and its morphology is irregularly granular. The synthesis temperature has an important effect on the phase transformations of powders but the reaction time only has a little effect. The impurities in gangue result in the detected secondary magnesium aluminate spinel and the decreased synthesis temperature.

关键词： gangue cordierite low temperature synthesis phase transformation mechanism