Home  |  About Journal  |  Editorial Board  |  Instruction  |  Subscribe  |  Advertisement  |  council  |  Contact Us  |  中文

Forthcoming Articles       Current Issue       Advanced Search       Archive       Download Articles       Read Articles       Email Alert

Quick Search     Adv Search   2017 Vol. 27, No. 03 Published: 2017-06-10   1 Application situations of powder metallurgy friction materials and requests of raw materials WANG Xiu-fei，，YIN Cai-liu DOI: 10.13228/j.boyuan.issn1006-6543.20170069 Powder metallurgy technology has been quickly developed in China. The application situations of powder metallurgy friction materials on plane brake， tank brake， clutch disc， main rotor shaft of wind power generation， brake pad of high-speed train at home and abroad were introduced systematically， and the detailed requests of raw materials were proposed， in order to provide reference for further development of powder metallurgy technology. 2017 Vol. 27 (03): 1-6 [Abstract] ( 1 ) HTML (1 KB)  PDF  (0 KB)  ( 2 ) 7 Study on synthesis of Mo2C ultrafine powders by “precursor plus vaccum carbothermal reduction” method ZHANG Zheng-quan，JIN Yong-zhong，LI Jie-wen，QIU Peng，SU Xiao-hui DOI: 10.13228/j.boyuan.issn1006-6543.20160028 Mo2C powders were prepared by the method of precursor plus vaccum carbothermal reduction. XRD and FESEM were used to investigate the effects of carbon content， synthesis temperature and holding time on the microstructure and phase composition of synthesized powders. The results show that Mo2C ultrafine powders with particle size of 100-500 nm is prepared when the carbon content is 150% （mass percent） at 1 150 ℃ for 2.0 h. 2017 Vol. 27 (03): 7-10 [Abstract] ( 1 ) HTML (1 KB)  PDF  (0 KB)  ( 3 ) 11 Study on preparation and properties of graphene oxide/Eu2O3 composite ZHAO Cun-shu，WANG Fu，HAO Bin DOI: 10.13228/j.boyuan.issn1006-6543.20150113 Graphene oxide/Eu2O3 composite powder were prepared by hydrothermal synthesis with graphene oxide and Eu2O3 as raw materials. The composite powder with different amounts of graphene oxide were characterized by scanning electron microscope， differential thermal analysis and fluorescence analysis. The experimental results show that graphene oxide/Eu2O3 composite powder can be successfully prepared by hydrothermal synthesis； The surface of graphene oxide is coated by Eu2O3， which preventing the decomposition of some functional groups on the surface of graphene oxide， and the composite powder has better stability； The fluorescence emission wavelength of the composite is 435 nm through fluorescence excitation spectra analysis， and the fluorescence intensity of the composite increases with the increase of graphene oxide content from 6% to 10% (mass percent). 2017 Vol. 27 (03): 11-14 [Abstract] ( 1 ) HTML (1 KB)  PDF  (0 KB)  ( 2 ) 15 Preparation of SiC powder by using polysilicon cutting waste WU Yue-dong，ZHANG Guo-hua，HAN Pei-wei，ZHOU Guo-zhi DOI: 10.13228/j.boyuan.issn1006-6543.20160036 In view of the serious environmental pollution problems caused by the current large accumulation of polysilicon cutting waste， a process to prepare SiC by adding activated carbon to high temperature reaction was carried out by using the polysilicon cutting waste as raw material. The polysilicon cutting waste was leached by HCl solution to remove the impurity Fe. Firstly， the thermodynamics of the reactions between the components in waste and carbon was calculated. Then， the differential thermal analysis （DTA）， X-ray diffraction （XRD） and scanning electron microscope （SEM） were used to analyze the effects of reaction temperature， reaction time and impurity Fe on the phases and morphology of the products. It is found that the main components of the cutting waste after hydrochloric acid leaching are silicon carbide and silicon. The iron must be removed in advance before high temperature treatment because the carbon cannot react with Fe-Si alloy （FeSi， Fe5Si3， etc.） to generate SiC. When the reacted temperature is higher than 1 400 ℃， the reaction between activated carbon and the treated waste is quick， and silicon carbide with high purity is obtained. Meanwhile， the morphology of the produced SiC particles are the same as that of the carbon particles. 2017 Vol. 27 (03): 15-20 [Abstract] ( 0 ) HTML (1 KB)  PDF  (0 KB)  ( 2 ) 21 Study on characteristics and kinetics of Australian PB powder reduced by CO in rotary bed WEI Zheng，LIU Gai-huan，JIA Jiang-ning，DONG Yue，ZHAO Xiu-li，ZHANG Yong-fa DOI: 10.13228/j.boyuan.issn1006-6543.20160130 The experimental study on the direct reduction of Australian PB powder by CO was carried out by using a self-developed small-scale rotating bed reactor combined with chemical analysis and X-ray diffraction analysis. The results show that when the CO flow rate is 200 mL/min， the particle size range is 0.044-0.089 mm， the reduction time is 60 min， and the reduction temperature is 1 000 ℃， the reduction rate and metallization rate of reduced product are 92.70% and 86.28%， respectively. Kinetic analysis for Australian PB powder reduction reaction was carried out based on the shrinking unreacted core model at 700-1 000 ℃. It is concluded that the reduction process is controlled by the gas internal diffusion and interface chemical reaction in the initial stage[(t＜30 min)，]and the limiting step of reduction reaction is gas internal diffusion in the final stage[（t＞30 min）]with the pre-exponential factor of[A]is 0.006 72 s－1 and the apparent activation energy of[E]is 10.043 kJ/mol. 2017 Vol. 27 (03): 21-27 [Abstract] ( 1 ) HTML (1 KB)  PDF  (0 KB)  ( 2 ) 28 Preparation of[Li1+xAlxTi2-x(PO4)3]solid electrolyte in lithium-air batteries SHENG Chao-yu，HUANG Zhe，SHAO Hui-ping，ZHENG Hang DOI: 10.13228/j.boyuan.issn1006-6543.20160019 The[Li1+xAlxTi2-x(PO4)3]solid electrolyte in lithium-air batteries was prepared by solid phase sintering method. The Li2CO3， AI2O3， TiO2， NH4H2PO4 were used as raw materials. The properties of the electrolyte were studied by changing the different[x]and sintering temperature. The structure and properties of the electrolyte were characterized by XRD， SEM and EIS. The results show that pure LATP is prepared when[x＝0.2.]The conductivity of LATP at the room temperature is 4.89×10－5 S/cm when the sintering process is sintering at 350 ℃ for 2 h， at 600 ℃ for 2 h and at 1 000 ℃ for 8 h. 2017 Vol. 27 (03): 28-30 [Abstract] ( 0 ) HTML (1 KB)  PDF  (0 KB)  ( 2 ) 31 Research on preparation and application of the catalytic debinding feedstock for 304 stainless steel powder injection molding JING Xiao-long，CHEN Hui，LIU Bing，DENG Ying DOI: 10.13228/j.boyuan.issn1006-6543.20160068 With the polyoxymethylene (POM) as the main components of catalytic debinding binder， the feedstock for 304 stainless steel powder injection molding was prepared. The weight-loss process， debinding process and linear shrinkage ratio were analyzed， and the properties of sintered bars were detected. Results show that the suitable injection temperature is 180-200 ℃， the debinding temperature is below 250 ℃. The average density of injection blank is 5.399 g/cm3， and the average density of sintered samples is 7.829 g/cm3. The linear shrinkage ratio in the direction of length， width and height are 14.11%，14.02% and 14.21%， respectively. The microstructure of the sintered compacts is typical austenite. 2017 Vol. 27 (03): 31-34 [Abstract] ( 0 ) HTML (1 KB)  PDF  (0 KB)  ( 1 ) 35 Study on the formulation of adhesive for soft magnetic composites AN Di，YAN Liang-ming，LI Wei-jian，LI Yuan-yuan DOI: 10.13228/j.boyuan.issn1006-6543.20160041 The magnetic material industry is developing rapidly， but its insulation coating process is still flawed， and the organic coating process still has a lot of room for improvement. The bisphenol A epoxy resin adhesive was prepared by adding different curing agent and coupling agent， and the magnetic ring can be directly tested was prepared by mixing and granulating the adhesive with the soft magnetic powder. The magnetic permeability， insulation resistance， compressive strength and density of the magnetic ring were tested. It is found that with the increase of curing agent content， the heat release rate in the process of reaction and the density of the magnetic ring increase firstly and then decrease. However， different curing agents have different effects on the insulation resistance and compressive strength. With the increase of coupling agent， the insulation resistance of the magnetic ring increases， the permeability decreases， and the compressive strength increases firstly and then decreases. 2017 Vol. 27 (03): 35-39 [Abstract] ( 2 ) HTML (1 KB)  PDF  (0 KB)  ( 1 ) 40 Study on the preparation and properties of new high strength corrosion resistant alloy filter for high temperature flue gas dust removal KANG Yan，XU Pei-min，ZHANG Xiao-qing，LU Wen-jing，HOU Li-qiang DOI: 10.13228/j.boyuan.issn1006-6543.20170017 Through the process of cogging， drawing， carding and sintering， the new high-strength corrosion resistant alloy filter was prepared with [?]240 mm ingot as raw material. The high temperature oxidation resistance， high temperature tensile properties and filtration properties of the filter were systematiclly studied. Results show that the filter has good oxidation resistance at 700 ℃. When the temperature increases from room temperature to 650 ℃， the tensile strength of the alloy filter decreases linearly. Meanwhile， the elongation of the alloy decreases slowly when the temperature is lower than 150 ℃， and it decreases rapidly at 150-450 ℃， while it decreases slowly when the temperature is higher than 450 ℃. When the filtration velocity is 1.5 m/min and 5.0 m/min， the filtration efficiency of the filter material for the particles with particle size larger than 0.5 μm is more than 98%. The outlet dust concentration is only 0.5 mg/m3， which completely meets the emission standards of air pollutants in the fields of metallurgy， chemical and energy. 2017 Vol. 27 (03): 40-43 [Abstract] ( 0 ) HTML (1 KB)  PDF  (0 KB)  ( 2 ) 44 Microstructure and mechanical properties of architectural solder joint ZHANG Yi DOI: 10.13228/j.boyuan.issn1006-6543.20160043 OM， XRD， SEM and tensile testing were used to study the effects of brazing parameters on the intermetallic compounds (IMC) and mechanical properties of SnAg0.5CuZn0.1Ni/Cu lead-free solder joints. The results reveal that addition of 0.1%Ni (mass percent) can refine the primary β-Sn phase and eutectic structure of SnAg0.5CuZn solder alloy obviously. The maximum shear strength of 47 MPa is obtained from the joint soldered under the soldering temperature of 270 ℃ and soldering time of 240 s. 2017 Vol. 27 (03): 44-48 [Abstract] ( 0 ) HTML (1 KB)  PDF  (0 KB)  ( 2 ) 49 Effect of TiC content on the microstructure and mechanical properties of Mo2FeB2 based cermets CONG Shan-hai，PENG Jia-jian，TAO Ze-xu，ZHANG Zhi-wei DOI: 10.13228/j.boyuan.issn1006-6543.20160024 Adding 3%-12% (mass percent) TiC powder into the raw materials to prepare Mo2FeB2-based cermet. The microstructure and micro-area composition of the samples were studied by using optical microscope， scanning electron microscope and EDS after ball-milling， compacting and vacuum sintering processes. The mechanical properties were also studied by using hardness tester and universal testing machines. The wear resistance was analyzed using the method of grinding wheel ground. Results indicate that， the addition of TiC is benefit for refining the microstructure and improving uniformity of Mo2FeB2 based cermets， and the hardness， bending strength and wear resistance of Mo2FeB2 based cermets are greatly improved with TiC addition. 2017 Vol. 27 (03): 49-52 [Abstract] ( 1 ) HTML (1 KB)  PDF  (0 KB)  ( 1 ) 53 Microstructure and mechanical properties of SiCp/6061Al composites prepared by powder metallurgy method YAN Li-peng，WEN Xiu-hai，YUAN Guo-sen DOI: 10.13228/j.boyuan.issn1006-6543.20160076 The SiC/6061Al composites containing 35% (volume fraction) SiC were produced by powder metallurgy method. Effects of the microstructure and the interface between the matrix and the reinforcement on the mechanical properties of the composites were studied. Results show that the SiC particles are distributed uniformly in the matrix， and the interface bonding between the matrix and the reinforcement is good. The composite has high density and high tensile strength. 2017 Vol. 27 (03): 53-56 [Abstract] ( 1 ) HTML (1 KB)  PDF  (0 KB)  ( 2 ) 57 Research progress on preparation of (Ti， M)C composite carbides PANG Li-juan，DENG Gang，ZHANG Xue-feng，XIAO Hong DOI: 10.13228/j.boyuan.issn1006-6543.20160042 The different methods for synthesizing (Ti， M)C carbides were summarized. The preparation process and principle of different preparation methods were introduced in detail， and the advantages and disadvantages of the methods were discussed. Carbon thermal reduction is one of the most widely used methods to prepare (Ti， M)C with complex component， but it has high energy consumption and complex process. Pre-alloying method can prepare some carbides with special components， but its use is limited. Self-propagating high temperature synthesis can prepare various kinds of (Ti， M)C， but most of them need to be preheated and the reaction is incomplete. Generally speaking， there is no preparation method which has the advantages of high efficiency， simple process flow， strong applicability and high product purity， simultaneously. Improvement of the existing preparation methods to meet the industrial application is the research and development direction of (Ti， M)C composite carbide. 2017 Vol. 27 (03): 57-62 [Abstract] ( 3 ) HTML (1 KB)  PDF  (0 KB)  ( 2 ) 63 Application of hot isostatic pressing in preparation of rare and refractory metal products LIN Xiao-hui，LI Lai-ping，LI Bin，LIANG Jing，XUE Jian-rong，ZHANG Xiao-ming DOI: 10.13228/j.boyuan.issn1006-6543.20170006 The development of hot isostatic pressing technology， the principle of equipment， the material selection and manufacturing requirements of canning， and the application of numerical simulation in the hot isostatic pressing technology were overviewed. The applications of hot isostatic pressing in preparation of rare and refractory metals (tungsten， molybdenum， tantalum， niobium， rhenium and their alloys) product were introduced in detail. The influence of hot isostatic pressing on microstructure and mechanical properties of refractory metal were also introduced. 2017 Vol. 27 (03): 63-67 [Abstract] ( 3 ) HTML (1 KB)  PDF  (0 KB)  ( 2 ) 68 Optimization of process parameters of electrolytic rare earth by orthogonal method SUN Ning，JIANG Dao-lin DOI: 10.13228/j.boyuan.issn1006-6543.20160030 According to the current situation of rare earth electrolytic cell production in China， taking the 8 kA rare earth electrolytic cell as the research object， the important factors which influence the result of electrolysis production was tried to find out through the actual production data and production situation in a factory practice. According to the existing equipments and conditions in the factory， five factors affecting the experimental results were determined， including： electrolytic voltage， electrolytic temperature， reaction time， polar distance and feeding frequency. Based on the orthogonal analysis of these factors， the primary and secondary relation of the influence on the production results were given out， and the optimum combination of factors was determined. It is found that the temperature plays a key role in the process of electrolysis. Bad temperature control leads to fluctuating production efficiency， low current efficiency and serious energy consumption. According to the best process parameters， all the indexes of the electrolytic cell are improved obviously. 2017 Vol. 27 (03): 68-71 [Abstract] ( 0 ) HTML (1 KB)  PDF  (0 KB)  ( 2 ) 72 Analysis of the residual magnetism in non-magnetic high manganese steel TANG Bo DOI: 10.13228/j.boyuan.issn1006-6543.20170007 High manganese non-magnetic steel plays an important role in the fields of electric power， transportation， aerospace and national defense because of its non magnetism and excellent mechanical properties. However， the non magnetism of the steel is not good in the actual production. The microstructure， phase composition of high manganese steel were studied using optical microscope and X-ray diffractometer， and the relative permeability of the steel was measured. The cause of residual magnetism for high manganese steel was analyzed. Results show that the samples after heat treatment at 1 200 ℃ are almost completely austenite， the content of residual ledeburite is low， and the non magnetism properties are better. 2017 Vol. 27 (03): 72-76 [Abstract] ( 0 ) HTML (1 KB)  PDF  (0 KB)  ( 4 )

Copyright © Editorial Board of Powder Metallurgy Industry Supported by:Beijing Magtech