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Quick Search     Adv Search   2020 Vol. 30, No. 02 Published: 2020-04-10   1 Advances in preparation of titanium alloy from powder metallurgy Hot! GUO Zhi-meng，LU Bo-xin，YANG Fang，CHEN Cun-guang，，WANG Hai-ying，ZHANG Ce DOI: 10.13228/j.boyuan.issn1006-6543.20200022 Titanium and its alloys are widely used in aerospace, automobile and ship, petrochemical industry, biological medicine and other fields because of their low density, high strength, good corrosion resistance and good biocompatibility. The article mainly aims at the preparation technology of powder metallurgy of titanium and titanium alloys, current situation are introduced. Powder manufacturing and densification at home and abroad are introduced. It is pointed out that the key for the future development of powder metallurgy titanium alloys is the preparation of low clearance element fine titanium powder, large size green and high performance sintered preform. 2020 Vol. 30 (02): 1-7 [Abstract] ( 4 ) HTML (1 KB)  PDF (1343 KB)  ( 8 ) 8 Preparation of Cu-15Cr-15W composites by SPS Hot! GAO Sheng-yuan,HAN Cui-liu,HE Chao,PAN Ya-fei,ZHANG Jiu-xing DOI: 10.13228/j.boyuan.issn1006-6543.20180164 In this paper, three Cu-15Cr-15W composite powders were prepared by high energy ball milling and mechanical mixing, and then Cu-15Cr-15W alloy was prepared by spark plasma sintering (SPS). The effects of different mixing processes on the microstructure, physical and mechanical properties of the alloy were studied. The results show that the Cu-15Cr-15W composite powder prepared by first high-energy ball milling of Cr and W powders is mechanically mixed with Cu powder, and the microstructure of the copper alloy obtained by SPS is fine and uniform, the density is up to 99.3%, and the performance is better than the same. The Cu-30Cr alloy prepared by the SPS process has a conductivity of 2.95×107 S/m, a thermal conductivity of 212.0 W/(m·K), a Vickers hardness of 152 HV0.5, and a tensile strength and elongation of 365 MPa and 11.5%. 2020 Vol. 30 (02): 8-13 [Abstract] ( 4 ) HTML (1 KB)  PDF (2713 KB)  ( 5 ) 14 The regulation of FeCuP semisolid particle on the microstructure and performance of diamond complex under heat/pressure coupling effect Hot! LI Sheng-nan，LONG Wei-min，XUE Hong-yu，ZHONG Su-juan，YU Xin-quan DOI: 10.13228/j.boyuan.issn1006-6543.20180132 The diamond matrix is very important to the performance of diamond tool, and the processing parameters has a significant impact on the performance of diamond matrix. The variable control method was adopted in this paper. The effects of sintering process parameters on the microstructure and property of the Fe-Cu-P ternary matrix were studied by taking sintering temperature, time and pressure as single variables. The properties of the matrix and the experimental parameters were comprehensively analyzed. The 820℃, 30 KN, and 270 s were chosen as the best sintering temperature, pressure, and the optimum time, respectively. 2020 Vol. 30 (02): 14-20 [Abstract] ( 4 ) HTML (1 KB)  PDF (2080 KB)  ( 4 ) 21 Experimental research on preparation of ultra-fine iron powder by carbothermal pre-reduction and hydrogen reduction Hot! KONG Ling-bing，GUO Pei-min，ZHAO Pei， WANG Lei DOI: 10.13228/j.boyuan.issn1006-6543.20180165 The low-temperature carbon reduction and hydrogen secondary reduction tests were carried out on a steel strip test device to trial-produce ultra-fine metal iron powder. The effects of carbon powder with three different components on the quality of metal iron powder products were studied. The results shows that low-ash and high-fixed carbon content carbon powder meet the requirements for the preparation of pure metal iron powder; adding a small amount of catalyst can significantly improve the reduction effect of low-temperature carbon and the indirect reduction rate at low temperatures. When the reduction temperature is 850 ℃, the heating time is 2 h, the reduced carbon is 80% of the oxygen content in the raw material, and the addition amount of potassium carbonate is 0.5%-1%, the TFe of the iron powder is greater than 91.7%. It can be reduced by hydrogen at 750 ℃ for 2 h to obtain qualified ultra fine metal iron powder. The D50 of the ultra-fine iron powder is 5~6 μm, and the D90 is 10~12 μm, the apparent density is 1.35 g/cm3. 2020 Vol. 30 (02): 21-25 [Abstract] ( 5 ) HTML (1 KB)  PDF (1135 KB)  ( 4 ) 26 Preparation of ultrafine copper powder by modified starch reduction of Cu2O Hot! WAN Xing-yuan,WANG Yi-yun,LI Feng-wen,ZHAO Yun,ZHU Li-guo,HU Han-ting DOI: 10.13228/j.boyuan.issn1006-6543.20180127 Ultra-fine copper powder was prepared by hydrothermal method with modified starch as reducing agent, and the influence of temperature and reducing agent amount on ultra-fine copper powder was investigated. The composition, morphology and average particle size of copper powder were investigated by XRD, SEM and laser particle size analyzer. The results show that when the temperature is 180 °C and 0.7 mol modified starch is added, the near-spherical high-purity ultrafine copper powder is prepared which average particle size is 0.41 μm. The test results can provide reference for the low-carbon green production of ultra-fine copper powder by using other low-cost green environmentally friendly biomass (rice straw, wheat straw, etc.) as raw materials. 2020 Vol. 30 (02): 26-30 [Abstract] ( 3 ) HTML (1 KB)  PDF (1917 KB)  ( 3 ) 31 Microstructure and properties of TiB2 particle reinforced /Cu matrix composites Hot! ZUO Ming-xin DOI: 10.13228/j.boyuan.issn1006-6543.20190010 TiB2 particle reinforced /Cu matrix composites were prepared by hot pressing sintering. The effects of different TiB2 particle additions on the microstructure and properties were studied by XRD, OM, SEM and other test methods.The results show that the composite material produces a high intensity Cu diffraction peak, and a hybrid reinforcing phase composed of TiB2 and TiB has been formed in the Cu matrix. All the reinforced phases in the composite samples distribute uniformly, and the samples with 6% TiB2 particle addition contain two kinds of reinforced phases: particle and whisker.When the proportion of TiB2 particle content increases, the hardness of all Cu matrix composite samples increases, while the density decreases and the conductivity increases.TiB2(6%)/Cu composite samples form four characteristic peaks during DSC heating.When the temperature reaches 800 ℃, Cu3Ti intermetallic compound is formed. As the temperature rises to 1 100 ℃, TiB2 particles and TiB whiskers are generated simultaneously in the matrix. 2020 Vol. 30 (02): 31-34 [Abstract] ( 2 ) HTML (1 KB)  PDF (1477 KB)  ( 3 ) 35 Study on sampling method for direct quantitative analysis of multi-element in stainless steel powders Hot! LIU Zong-xin， SHEN Xue-jing， LI Dong-ling， LIU Jia DOI: 10.13228/j.boyuan.issn1006-6543.20190020 Traditional quantitative analysis methods of metal powders need to the process of chemical dissolution or melt pressing. In this paper, a laser-induced breakdown spectroscopy (LIBS) method for direct quantitative analysis of stainless steel powders without melting or chemical sample preparation is proposed. The effects of different sample preparation methods and laser ablation conditions on the quantitative analysis results in stainless steel powders were studied. It was found that the material of the sample mould had an important influence on the effect of sample preparation. The stability and accuracy of the analysis results were greatly improved by appropriate sample preparation pressure. At the same time, the choice of laser ablation times will also affect the stability of spectral signals. Basis on these studies, a sample preparation and quantitative analysis method for direct quantitative analysis of nine elements in stainless steel powder by LIBS were established. The analysis results of Mo, Si, W, Ni, Mn, Cr and Co have good consistency with the results obtained by the corresponding element reference value of chemical analysis. 2020 Vol. 30 (02): 35-40 [Abstract] ( 4 ) HTML (1 KB)  PDF (1878 KB)  ( 5 ) 41 Kinetic analysis and morphology characterization of copper nano-powder prepared by thermal decomposition Hot! ZHENG Xing-long, JIN Yong-zhong,CHEN Jian,REN Jiao,HUANG Cong,GONG Jiang-long DOI: 10.13228/j.boyuan.issn1006-6543.20180136 The copper nano-powder with diameter of 50 nm were prepared by thermal decomposition method using cupric (Ⅱ) tartrate as the source. In this study, the effects of different heating rates (1 ℃/min, 5 ℃/min and 10 ℃/min) on the phase and morphology of the products were studied. The as-prepared copper nano-powder were characterized by XRD, AFM and other characterization methods. The results show that the heating rate in the pyrolysis of cupric (Ⅱ) tartrate was the controlling factor for preparing copper nano-powder. The low heating rate could significantly reduce the thermal decomposition temperature of cupric (Ⅱ) tartrate and promote the purification and nano-crystallization of copper powders. 2020 Vol. 30 (02): 41-45 [Abstract] ( 4 ) HTML (1 KB)  PDF (1416 KB)  ( 3 ) 46 The microstructure and photocatalytic properties of Ag/ ni-based Ag3PO4/CNTs composite membrane Hot! WEN Bing-hui DOI: 10.13228/j.boyuan.issn1006-6543.20180181 Ag/Ni-based Ag3PO4/CNTs composite films for sensors were prepared by electrochemical deposition on nickel matrix, and their photocatalytic activity and stability were tested under visible light. The results show that the composite membrane form a network structure composed of CNTs and Ag3PO4, and CNTs can play a good supporting role to the network structure and make the composite membrane obtain better stability. A characteristic peak of CNTs with high strength is formed in the composite film, and there is a strong interaction between CNTs and Ag3PO4. Compared with Ag3PO4 film, the composite film has better light absorption performance in the ultraviolet and visible regions, and effectively promotes the photocatalytic reaction. The composite membrane can be used continuously for 5 times under the condition of stable photocatalytic activity. Compared with the system without capture agent, the degradation rate of the system with tert-butanol decrease, and that with the addition of ethylenediamine tetra acetic acid decrease significantly. 2020 Vol. 30 (02): 46-49 [Abstract] ( 3 ) HTML (1 KB)  PDF (1299 KB)  ( 4 ) 50 Hot deformation behavior and constitutive equations of an advanced fourth generation powder metallurgy superalloy Hot! HOU Qiong，TAO Yu，JIA Jian，ZHANG Guo-dong，QU Jing-long DOI: 10.13228/j.boyuan.issn1006-6543.20180142 The hot deformation behavior of a fourth generation powder metallurgy (PM) superalloy was investigated by using a Gleeble-3800 simulator over the deformation temperature range of 1 060~1 140 ℃ and strain rate range of 0.001~1 s-1 with a true strain of 0.69. The results show that the flow stress curves of the alloy exhibits dynamic recrystallization future. Based on the hyperbolic sine Arrhenius-type model and experimental data, two kinds of constitutive equations are established by using peak stress and considering the influence of strain. The predicted flow stress values calculated by employing the latter one are consistent with the actual experimental values, with a low average absolute relative error of 7.875 38%. Thus, the developed constitutive model with a strain modification can be adopted to describe the hot deformation behavior of the alloy and provide references for the design and optimization of hot working. 2020 Vol. 30 (02): 50-55 [Abstract] ( 3 ) HTML (1 KB)  PDF (1976 KB)  ( 9 ) 56 Effect of calcining temperature on the characterization of Bi(Fe0.9Mn0.1)O3 powder prepared by ball-milling-calcining Hot! LI Jian-ming DOI: 10.13228/j.boyuan.issn1006-6543.20180163 The MnCO3 carbonate and ferro bismuth BiFexCO3 subcarbonate were selected as raw materials, Bi(Fe0.9Mn0.1)O3 powder particles were prepared by wet ball grinding and calcining, and the influence of calcining temperature on its performance was studied. The results show that the precursor contains MnCO3 and BiFexCO3, and the calcining temperature of the precursor is set between 455-820 ℃. The microstructure and agglomeration morphology of samples are significantly affected by the calcination temperature. When the temperature reaches 700 ℃, spherical and polyhedral particles with particle sizes between 120-280 nm are formed. All samples have similar background contrast, and there are no different regions with significant difference in light and shade, indicating the uniform distribution of the manganese and bismuth form. The products formed by calcination at 600-800 ℃ have high near-infrared reflectivity for all bands, especially when the temperature rises to 700 ℃, they have excellent reflection performance. 2020 Vol. 30 (02): 56-60 [Abstract] ( 5 ) HTML (1 KB)  PDF (1483 KB)  ( 2 ) 61 Effect of the temperature on the patterns and the optical properties of Nd2O3 particles obtained with Nd2(C2O4)3·10H2O by the thermal decomposition method Hot! FU Xiao-ming, SUN Hu, YANG Zai-zhi DOI: 10.13228/j.boyuan.issn1006-6543.20190015 The thermal decomposition of Nd2(C2O4)3·10H2O in the air is based on the its TG-DTA curve. The phases, the morphologies and the optical properties of the thermal decomposition products of Nd2(C2O4)3·10H2O in the air were characterized with X-ray diffraction (XRD), scanning electron microscopes (SEM) and UV-Visible spectrophotometer (UV-Vis) respectively. The results show that there are three steps in the process of the thermal decomposition of Nd2(C2O4)3·10H2O in the air. The first step is that Nd2(C2O4)3·10H2O lose H2O and then changes into Nd2(C2O4)3 at 25-300 ℃. The second step is that Nd2(C2O4)3 is heated to decompose into Nd2O2CO3 at 300-600 ℃. The third step is that Nd2O2CO3 is heated to decompose into Nd2O3 at 600-750 ℃. Nd2O3 nanoparticles are obtained by the thermal decomposition method with Nd2(C2O4)3·10H2O is heated at 950 ℃ for 15 min. With the increasement of thermal decomposition temperature, more Nd2O3 particles are obtained and their optical absorption properties become stronger. Especially, Nd2O3 nanoparticles have many strong absorption peaks and wide absorption bands, which expand the application field of their optical properties. 2020 Vol. 30 (02): 61-64 [Abstract] ( 6 ) HTML (1 KB)  PDF (1563 KB)  ( 6 ) 65 Effect of lubricant selection and addition on the pressing properties of powder metallurgy stainless steel Hot! ZHENG Wei-guog, ZHU Xiao-feng, ZHOU Qing DOI: 10.13228/j.boyuan.issn1006-6543.20180137 In this paper, the effects of different combinations and additions of lubricants on the compressibility, fluidity and formability of SUS304L stainless steel mixed powder were studied by using the combination lubricants of green reinforce, ejection lubricant and pressing lubricant as basic units in compaction. The results show that the green density, fluidity, surface roughness and green strength can be improved by choosing the proper lubricant ratio. After experimental analysis, a reasonable lubricant selection scheme for powder metallurgy stainless steel is obtained. 2020 Vol. 30 (02): 65-68 [Abstract] ( 2 ) HTML (1 KB)  PDF (1247 KB)  ( 9 ) 69 Effect of different stirring blades on spray dried Mo powder Hot! ZHANG Xiao DOI: 10.13228/j.boyuan.issn1006-6543.20190016 Two kinds of stirring blades were used to prepare the spray granulation molybdenum powder. The effect of stirring rate and stirring blades on the homogeneity of the slurry and the microstructure, apparent density and fluidity of the spray granulation molybdenum powder were investigated in this paper. The results show that with the increasing of stirring rate, the homogeneity of slurry increases, the apparent density and fluidity are improved, the sphericity gradually goes better. The structure of stirring blades has an important influence on the spray-dried powders. In the experiment, the stirring blades combined helical blades with impeller blades is better suited for Mo slurry stirring process. 2020 Vol. 30 (02): 69-72 [Abstract] ( 1 ) HTML (1 KB)  PDF (1453 KB)  ( 4 ) 73 Effect of electromagnetic frequency on properties of aluminum matrix composites reinforced by nano ZrB for automotive electrode Hot! REN Wei DOI: 10.13228/j.boyuan.issn1006-6543.20180186 ZrB/6063 nanocomposite was prepared by electromagnetic field technology using 6063 alloy as matrix material, and the relationship between the microstructure, mechanical properties and electromagnetic field was discussed. The results show that the diffraction peaks of aluminum matrix and ZrB structure are formed on the XRD diagram, and the intensity of the diffraction peaks increases with the addition of ZrB particles.When the electromagnetic frequency of electromagnetic field increases, the particles can form a more uniform distribution state, which improves the uniformity of particle size and greatly reduces the average size.When the electromagnetic frequency of the electromagnetic field increases, the mechanical properties of the composite increase obviously.When the electromagnetic frequency is 10 Hz, the tensile strength of the material is 358 MPa, the yield strength is 262 MPa, and the elongation is 24.7%, which increases by 38.8%, 67.9% and 32.8% respectively compared with the non-electromagnetic field.After increasing the electromagnetic field, more small dimples are formed in the tensile fracture area of the material, showing obvious dimple fracture characteristics. 2020 Vol. 30 (02): 73-77 [Abstract] ( 2 ) HTML (1 KB)  PDF (1664 KB)  ( 4 ) 78 Experimental study on the frosting performance of graphene / epoxy composite paint Hot! ZHANG Liu， ZHANG Bing DOI: 10.13228/j.boyuan.issn1006-6543.20200002 In this paper, graphene powder was added to epoxy resin coating to prepare graphene / epoxy resin composite coating. A cold surface frosting test-bed was set up to study the condensation and frosting on the surface of graphene composite coating, and compared with the surface of epoxy resin. The results show that in condensation experiment, the surface water bead spacing of graphene composite coating is large, so it is not suitable to be connected into pieces. In the frosting experiment, under the same ambient temperature and cold liquid temperature, the growth of frost crystals of graphene composite coating is slow, sparse and the frost suppression effect is good. When the coolant temperature is reduced to -10 ℃, the frost crystal on the surface of the graphene composite coating accelerate and concentrate. When the ambient temperature is reduced to 5 ℃, the thickness of the surface of the graphene composite coating was about 1/4 of the initial condition. After the salt spray resistance test, the addition of graphene can significantly improve the corrosion resistance of the epoxy coating. 2020 Vol. 30 (02): 78-82 [Abstract] ( 3 ) HTML (1 KB)  PDF (2151 KB)  ( 5 ) 83 Research progress of 3D printing technology for metallic materials Hot! LIU Chao-yang, ZHAO Bei-bei, LI Lan-jie, CHANG Fu-zeng, QI Jian, MA Ying-liang DOI: 10.13228/j.boyuan.issn1006-6543.20180139 According to the principle of 3D printing, the 3D printing process of metallic materials can be divided into five categories: powder bed fusion, directed energy deposition, binder jetting, material jetting, and sheet lamination. The basic principles, advantages and disadvantages, application fields and progress of the main technologies under various processes are introduced. Finally, several mainstream 3D printing technologies are compared, and it is pointed out that SLM and EBM have become the mainstream of powder bed fusion process and are suitable for small and super-complex monolithic components; directed energy deposition technology uses laser, electron beam or arc as energy sources to melt and deposit materials synchronously, which has high processing efficiency and is suitable for large and high-performance integral components. The binder jetting has a potential application in the manufacturing industry which needs rapid casting manufacturing because of its low production cost and short cycle. The development trend of 3D printing of metal materials is prospected. 2020 Vol. 30 (02): 83-89 [Abstract] ( 2 ) HTML (1 KB)  PDF (1231 KB)  ( 4 ) 90 Cobalt enriched wlag from the low acidic leaching of spent li-ion batteries by sulfuting roasting and leaching Hot! ZHOU Rong-chao, LU Jun-que, YE Min-jie, WANG Yu-bin, WANG Du DOI: 10.13228/j.boyuan.issn1006-6543.20180178 Cobalt was recovered from the low acidic leaching residue of spent lion batteries by sulfating roasting-leaching process. X-ray diffraction shows that Co3O4 is the main phase of raw materials that is difficult to leach. The results show that nearly 99.86% of cobalt is leached out under optimal conditions, the roasting temperature is 350 ℃, H2SO4-to-raw material mass ratio is 0.8, and roasting time is 1 h. 2020 Vol. 30 (02): 90-88 [Abstract] ( 1 ) HTML (1 KB)  PDF (975 KB)  ( 4 )

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