ISSN 1005-3093
CN 21-1328/TG
Started in 1987

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Preparation and Characterization of Nano Melamine Cyanurate and Its Application in Phenolic Foam
Nano melamine cyanurate (NMC) was synthesized by a solvothermal method, and characterized by FTIR, XRD and SEM. The effect of solvents, surfactants, reaction-temperature and -time on the particle size of the product were investigated. NMC can be only obtained by using distilled water as a solvent, a. . .
Chinese Journal of Materials Research, 2014 Vol. 28 (6): 401-406    DOI: 10.11901/1005.3093.2013.857
 
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CO2 corrosion behaviours of a novel Al-containing low Cr steel in a simulated oilfield formation water PDF (18066KB)
2020-05-13
The preparation of silicon-containing benzoxazine and its influence on the curing reaction kinetics of bismaleimide ester resin system PDF (3764KB)
JIAYuan, ZHANG Liying, MAMingyang, SHI Ruifeng
2020-05-13
Preparation of ultra-fast temperature responsive nanofibrous hydrogel and  application in controllable drug release PDF (9766KB)
2020-05-13
Microstructure and its CET prediction of TC4-DT by CMT Mode Wire and Arc Additive Manufacturing PDF (12447KB)
2020-05-13
Effect of Solution Temperature on Microstructure and Tensile Properties of Metastable Beta Titanium Alloy Ti-4Mo-6Cr-3Al-2Sn PDF (1862KB)
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2020-05-13
Current Issue More>>
      25 May 2020, Volume 34 Issue 5 Previous Issue   
    ARTICLES
    Effect of Long-term Aging on Microstructure and Mechanical Properties of 20Cr1Mo1VTiB Bolt Steel
    ZHAO Mengya, PENG Tao, ZHAO Jiqing, YANG Gang, YANG Bin
    Chinese Journal of Materials Research. 2020, 34 (5): 321-327.   DOI: 10.11901/1005.3093.2019.361
    Abstract   HTML   PDF (11615KB)

    The 20Cr1Mo1VTiB bolt steel was aged at 500℃ for 0~2000 h and then the effect of long-term aging on microstructure and mechanical properties were investigated by means of TEM, SEM, XRD, tensile- and impact-tester. Results show that the lath bainite in the steel was divided into several packets during the aging process. The size of the bainite package in the steel decreased from 13 μm before aging to 9 μm after aged for 2000 h. The main precipitates VC and TiC in the steel dispersed in the intragranular, lath boundaries and inside lath bainite after the aging process. TiC changed from a long strip to a square shape with an extension of the aging time. The boundary of bainite slabs gradually blurred with the increase of aging time, and the width of lath increased obviously after 2000 h aging. After aging for 2000 h the 20Cr1Mo1VTiB bolt steel still has high strength and toughness, therefore, which is suitable for long term service at high temperature.

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    A Phase-Field Study on Spinodal Decomposition of Ferrite of Fe-Cr-Ni Stainless Steels during Thermal Ageing and Annealing
    SHI Jiaqing, XUE Fei, PENG Qunjia, SHEN Yao
    Chinese Journal of Materials Research. 2020, 34 (5): 328-336.   DOI: 10.11901/1005.3093.2019.456
    Abstract   HTML   PDF (2267KB)

    In order to investigate the evolution of spinodal decomposition during ageing and annealing, a phase-field model based on Cahn-Hilliard equation has been developed to simulate the microstructure evolution in ferrite of Fe-Cr-Ni stainless steels. The simulation results reveal the formation of inter-connected α' phase during thermal ageing, and the increase of wavelength and amplitude of Cr concentration fluctuation with ageing time. During the subsequent annealing treatment, it is found that α' phase dissolves into the matrix, and the wavelength continues to increase, while the amplitude starts to decrease. The simulation results also indicate that the nano-indentation hardness is positively associated with the amplitude of concentration fluctuation. And the annealing time needed for recovery of spinodal decomposition (dissolving of α' phase) is reduced by increasing annealing temperature remarkably. There is an Arrhenius-type relation between the recovery time and the annealing temperature.

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    Effect of Quench Rate on Mechanical Properties and Microstructure of 6082 Al-alloy
    WANG Jing, XU Guofu, LI Yao, LI Fangfang, HUANG Jiwu, PENG Xiaoyan
    Chinese Journal of Materials Research. 2020, 34 (5): 337-344.   DOI: 10.11901/1005.3093.2019.382
    Abstract   HTML   PDF (6400KB)

    The quenching sensitivity of 6082 Al-alloy used in rail transit was investigated systematically by means of Jominy end-quench (JEQ) test, JMatpro7.0 simulation software, hardness test, tensile test and TEM. Results show that (1) The quenching sensitive temperature range is between 220~425℃. The nasal tip temperature for β'- and β''-phase is 375℃. According to the CCT curve, in order to suppress the precipitation of metastable β'- phase the cooling rate should be greater than 6℃/s during quenching process; (2) The hardness and strength decreased with the increase of the distance from the quenched end, and the depth of aging hardening layer is about 23 mm; (3) the quench-induced β-precipitates preferentially precipitated and grown on the heterogeneous nucleation site of α-(AlMnFeSi) phase, with the decrease of quenching cooling rate. During the subsequent aging process, the β-phase grows and absorbs the surrounding solute atoms, the strengthening precipitated β''-phase is reduced; (4) During the slow cooling process, the vacancy concentration near the grain boundaries decreases, and the precipitationfree precipitation zone (PFZ) at the grain boundaries widens.

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    Study on Corrosion Resistance and Thermal Insulation Properties of Graphene Oxide Modified Epoxy Thermal Insulation Coating
    LIANG Xinlei, LIU Qian, WANG Gang, WANG Zhenyu, HAN En-Hou, WANG Shuai, YI Zuyao, LI Na
    Chinese Journal of Materials Research. 2020, 34 (5): 345-352.   DOI: 10.11901/1005.3093.2019.543
    Abstract   HTML   PDF (2269KB)

    Graphene oxide (GO) modified epoxy thermal insulation coatings were prepared by adding GO concentrates, then corrosion immersion test in 3.5%NaCl (mass fraction) solution at 50oC and thermal insulation effect before and after corrosion tests were comparatively measured. Electrochemical analysis shows that the coating modified with 0.5% GO has higher low-frequency resistance than that of coatings with 0% and 1.0% GO. Good surface morphologies were retained for coatings with GO addition after immersion in 3.5% NaCl solution (50oC) for 432 h. Meanwhile, no obvious cracks and corrosion products were detected on the coating/substrate interface. The coating without GO addition emerges obvious corrosion. The thermal insulation effect to a 250oC heat source of the above three coatings before corrosion test presents slight differences. Whereas, after 432 h corrosion immersion test the coating with 0% GO, 0.5% GO and 1.0% GO presents quite different in thermal insulation effect with temperature drop as 98oC, 123oC and 115oC for the coated substrate and decrease of bonding strength to the substrate as 3.9 MPa, 1.0 MPa, 2.3 MPa respectively. These results verify that the epoxy coating modified with 0.5% GO has the best corrosion resistance and thermal insulation performance.

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    Adsorption Properties of Metal-organic Framework Material MIL-53(Al)-F127 for Bisphenol A
    SUN Yue, LI Dawei, WEI Qufu
    Chinese Journal of Materials Research. 2020, 34 (5): 353-360.   DOI: 10.11901/1005.3093.2019.466
    Abstract   HTML   PDF (1928KB)

    Mesostructured metal-organic framework material MIL-53(Al)-F127 was synthesized by one-step solvothermal method, and the morphology and structure of MIL-53(Al)-F127 were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffractometer (XRD), Fourier-transform infrared spectrometer (FTIR) and N2 adsorption-desorption (BET). The adsorption performance of MIL-53(Al)-F127 and the microporous structure MIL-53(Al) on bisphenol A in aqueous solution and the influence of the adsorbent concentration, pH, temperature were comparatively investigated. Results show that MIL-53(Al)-F127 exhibited good adsorption properties for bisphenol A in aqueous solution. The optimum pH level for the removal of BPA using MIL-53(Al)-F127 were 6. The optimum temperature for the sorption behavior of BPA on the sorbent was 30℃. The equilibrium sorption amounts of BPA on MIL-53-(Al)-F127 reached approximately 27.2 mg/g, the removal efficiency was 92% after approximately 20 min. The sorption kinetics of BPA were found to follow the quasi second order dynamic model.

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    Erosion Performance for Co-continuous Phase Composite of SiC Foam Ceramic/Ductile Iron
    WAN Wei, CAO Xiaoming, ZHANG Jinsong
    Chinese Journal of Materials Research. 2020, 34 (5): 361-367.   DOI: 10.11901/1005.3093.2019.167
    Abstract   HTML   PDF (4324KB)

    Co-continuous phase composite of SiC foam ceramic/ductile iron (DI) (SiCfoam/DI) was prepared by extrusion casting with the oxidized SiC foam ceramic as reinforcer, while the bare DI and composite of SiCparticles/ID were taken as comparison. The gas-solid two-phase flow induced erosion behavior of the three materials was assessed via a home-made gas-solid two-phase flow erosion tester, so that to reveal the effect of the erosion time (t), particle velocity (ν) and erosion angle (α), as well as the relevant erosion mechanisms. The results show that with the increasing erosion time, the erosion rate of the three materials decreased gradually and then down to a stable level. With the increase of particle impact velocity the erosion rate of DI increased gradually, and the erosion rate is proportional to ν2.95. While composites of SiCParticles/DI and SiCfoam/DI had similar erosion rates when the impact velocity was less than 87.5 m/s. When the impact velocity was greater than 87.5 m/s, the erosion rate of SiCParticles/DI was significantly higher than that of SiCfoam/DI. With the increase of erosion angle, DI exhibited erosion characteristics of brittle material, but SiCParticles/DI and SiCfoam/DI composites exhibited typical erosion characteristics of plastic material. The maximum erosion rate corresponded to the erosion angle 45°. The erosion mechanism of DI was micro-cutting at low angle, while erosion pitting and micro-cracking at high angle. For high-speed particle impact, SiCfoam/DI composite had better erosion- and wear-resistance than that of SiCParticles/DI composite and DI due to the overall reinforcement and shadow protection of SiC foam ceramics.

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    Effect of Bayan-Obo Tailings Content on Crystallization Characteristics and Properties of Glass-ceramics
    SONG Xue, LI Yafan, REN Jie, ZHONG Yaoyu, ZHANG Hongxia, OUYANG Shunli
    Chinese Journal of Materials Research. 2020, 34 (5): 368-378.   DOI: 10.11901/1005.3093.2019.472
    Abstract   HTML   PDF (8917KB)

    Metallic tailings built glass-ceramics were prepared with Bayan-Obo tailings as the main raw material and Cr2O3 as nucleating agent. The crystallization characteristics of tailings built glass-ceramics were characterized by means of DSC, XRD, SEM and Raman spectra and the properties of glass-ceramics were evaluated by bending strength, Vickers hardness and acid resistance tests. Results show that the glass-ceramics are mainly composed of crystalline phases of diopside and gehlenite, while the nucleating agent of Cr2O3 can promote the precipitation of the main crystalline phase of diopside by forming spinel. The mechanical and corrosion resistance characteristics of glass-ceramics showed a decreasing trend with the increase of tailings content. The higher CaO content caused by the increase of tailings content can lead to the obstruction of sliding and migration of crystalline phases in the crystal growth process. As a result, it was easy to produce cavities and defects in glass-ceramics. Meanwhile, the increase of the ratio of gehlenite/diopside was not conducive to the improvement of the properties of the glass-ceramics. In addition, the rare earth elements intergrowth in Bayan-Obo tailings can form the second phase of cerium calcium silica at the grain boundary, which can reduce the area and the total energy of grain boundaries, which was helpful to improve the mechanical and corrosion resistance of glass-ceramics.

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    Structure and Properties of Ultrathin Tetrahedral Amorphous Carbon Films
    XU Shipeng, WANG Hua, CHEN Weiqian, LI Yuhong, LI Yujun, WANG Aiying
    Chinese Journal of Materials Research. 2020, 34 (5): 379-384.   DOI: 10.11901/1005.3093.2019.265
    Abstract   HTML   PDF (1767KB)

    Ultrathin tetrahedral amorphous carbon (ta-C) films with different film thickness were prepared by filtered cathodic vacuum arc technique. The accurate measurement of the film thickness and sp3C content of the ultrathin ta-C films was conducted by means of ellipsometry combined with spectrophotometry. The acquired film thickness was further verified by XRD. The film density was acquired from the results of precise determination of lattice parameters. Raman spectroscopy were conducted to characterize the atomic bond structure of as-prepared film. The residual stress was calculated from the curvature of the film/substrate composite using Stoneys equation. Results show that as the film thickness increased from 7.6 to 33.0 nm there was no obvious change of the ultrathin ta-C film growth rate, which keeps constant as 1.7±0.1 nm/min, while the residual compressive stress and sp3 fraction decreased; for the film of thickness 7.6 nm the maximal sp3 fraction was obtained. The results are consistent with Raman's. For the film of thickness 11.0 nm, the maximal bulk layer density was 3070 kg/m3. The film thickness had no obvious influence on surface roughness of ultrathin ta-C films. In summary, ellipsometry combined with spectrophotometry is of feasible means for characterizing the structure and thickness of the ultrathin ta-C films. X-ray reflection can be used to measure the density and surface roughness of ultrathin ta-C carbon films of high quality.

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    Synthesis and Formation Mechanism of Lithium Battery High-Capacity Anode Material TiNb2O7
    XIE Lilan, YANG Dongsheng, LING Jing
    Chinese Journal of Materials Research. 2020, 34 (5): 385-391.   DOI: 10.11901/1005.3093.2019.568
    Abstract   HTML   PDF (4315KB)

    The precursor of TiNb2O7 is prepared via solid-phase synthesis with anatase and Nb2O5 as raw materials and then calcinated at 400℃, 800℃, 900℃, 1000℃ and 1100℃ respectively in air to prepare TiNb2O7 as electrode materials. The prepared materials are characterized by means of thermo-gravimetric analyzer, differential scanning calorimetry (TG-DSC), X-ray diffraction (XRD), scanning electron microscopy (SEM) and electrochemical test. The results show that the main reaction products of anatase and Nb2O5 at 900℃ is Ti2Nb10O29. TiNb2O7 is obtained by the reaction of Ti2Nb10O29 and rutile. The optimum calcination condition of pure monoclinic TiNb2O7 is 1100℃ for 8 h. TiNb2O7 anode material has an initial capacity of 278.4 mAh/g at 0.2C and the initial coulombic efficiency is 82.9%. In the meantime, TiNb2O7 has a good rate capacity, which can still reach 89% after 100 cycles at 1C rate.

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    Effect of Cyclical Flow Velocity on Magnetized Copper Electrolysis Process
    YAO Xiayan, ZHAO Yunyun, WANG Junhui, NIU Yongsheng, LU Xingwu
    Chinese Journal of Materials Research. 2020, 34 (5): 392-400.   DOI: 10.11901/1005.3093.2019.462
    Abstract   HTML   PDF (5816KB)

    In order to improve the quality of cathode copper, the intense magnetic field was used to enhance the diffusion of Cu2+ and the self-purification process of copper electrolysis. From the point of view of ionic magnetism and ionic hydration, experiments on magnetized copper electrolysis at different flow velocity were carried out. The effect of Lorentz force and magnetic field gradient force on the diffusion properties, impurity ion concentration and apparent quality of cathode copper was investigated. The mechanism of copper electrolysis strengthened by vertical orientation magnetic field and horizontal orientation magnetic field was respectively analyzed. Results show that magnetic field can strengthen the convection, weaken the hydrogen bonding, reduce the ion hydration and increase the energy of the system. Besides, the diffusion of Cu2+ and the deposition rate of impurity ions such as As, Sb and Bi were also increased, which could improve the clarity of electrolyte and the apparent quality of cathode copper. On the other hand, the dissolved oxygen, microbubbles and surface tension of electrolyte increased with the increase of cyclical flow velocity, so leading to the failure of magnetic field synergy. There is an optimum cyclical velocity to improve the quality of cathode copper in the process of magnetized copper electrolysis.

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