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HPHT preparation and micro-Raman characterization of polycrystalline diamond compact with low residual stress

Science China(Physics,Mechanics & Astronomy) 2010年第8期53卷 1445-1448页

作者： JIA HongSheng MA HongAn GUO Wei JIA XiaoPeng National Laboratory of Superhard Materials Jilin UniversityChangchun 130012China

High quality grown polycrystalline diamond compact (PDC) with low residual stress was prepared using the infiltration method with nickel based alloys as the solvent under high temperature and high pressure (HPHT). Scanning electron microscopy (SEM) was used to observe the micro morphology of the diamond layer and the diamond/WC substrate interface. It was found that dense and interlaced microstructure with diamond-diamond (D-D) direct bonding formed in the diamond layer of PDC. micro-Raman spectroscopy was used to measure the Raman shift of diamonds in the polycrystalline diamond (PCD) layer and the residual stress was calculated based on the Raman shift of diamonds. Experimental results show that the residual stress of PCD layer is compressive stress, and the range of the residual stress is from 0.075 to 0.250 GPa in the whole PCD layer, much lower than that of other reports (up to 1.400 GPa). Moreover, the distribution of the residual stress from the diamond surface layer to the inner cross-section is homogeneous.

关键词： HPHT PCD micro morphology residual stress

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Particle agglomeration behavior in fluidized bed during direct reduction of iron oxide by CO/H_(2)mixtures

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Journal of Iron and Steel Research International 2023年第4期30卷 626-634页

作者： Feng Lu Hong Zhong Bo Liu Jian Xu Sheng-fu Zhang Liang-ying Wen School of Materials Science and Engineering Chongqing UniversityChongqing 400044China Chongqing Key Laboratory of Vanadium-Titanium Metallurgy and Advanced Materials Chongqing UniversityChongqing 400044China School of Mechanical and Materials Engineering Washington State UniversityPullmanWA 99163USA

The agglomeration behavior of particles significantly impacts on the defluidization occurring in a fluidized bed during the direct reduction *** influence of CO/H_(2)ratio on surface diffusion of iron atoms was proposed,and the solid bridge force between iron oxide particles was quantificationally ***,the solid bridge force was successfully added into a CFD–DEM(computational fluid dynamics–discrete element method)model combined with heat transfer and mass transport to investigate the detailed information of agglomeration in a fluidized bed,including the spatial distribution of temperature,velocity and metallization of iron oxide *** region of defluidization is sensitive to the reduction *** the same reduction temperature,the iron oxide powder will perform higher metallization and stable fluidization properties with molar fraction of H_(2)in the range of 0.6–0.8,when iron oxide is reduced by CO/H_(2)mixture.

关键词： Direct reduction Computational fluid dynamics Discrete element method Particle agglomeration CO/H_(2)mixture micro morphology

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Long-term Properties of Aeolian Sand-magnesium Oxychloride Cement Composites and Its Engineering Application

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Journal of Wuhan University of Technology(Materials Science) 2023年第4期38卷 842-848页

作者：常成功 DONG Jinmei ZHENG Weixin WEN Jing 阎峰云肖学英 AN Lingyun State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals Lanzhou University of TechnologyLanzhou730050China Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources Qinghai Institute of Salt LakeChinese Academy of SciencesXining810008China Key Laboratory of Salt Lake Resources Chemistry of Qinghai Province Xining810008China Qinghai Provincial Key Laboratory of Nanomaterials and Technology College of Physics and Electronic Information EngineeringQinghai Minzu UniversityXining810007China

In order to prepare a new material with long-term stable performance,low cost,easy construction,and ecological environmental protection,the influence of aeolian sand on the compressive and flexural strength as well as micro morphology and phase composition of magnesium oxychloride cement(MOC)was *** experimental results indicate that,with the increase of content of doping sand,the compressive strength and flexural strength of MOC decrease ***,when the quality ratio of aeolian sand and light burned magnesia powder is 1:8,the performance meets the actual engineering ***,the compressive strength of MOC is not less than 18 MPa,and flexural strength is not less than 4 ***,within 12 months of age,the compressive strength and flexural strength are *** is no obvious change in phase composition,and its main phase is still 5·1·8 *** appearance changes from needle-like to gel-like *** on engineering applications,it is found that when the novel sand-fixing material is used in the field for one year,its macroscopic feature is not damaged,compressive strength and flexural strength are also more stable,phase composition negligibly changes,and micro morphology has also been turned into be gellike *** further confirm the long-term stability and weather resistance of MOC doping aeolian sand,providing theoretical and technical support for the widely application of MOC in the field of sand fixation in the future.

关键词： magnesium oxychloride cement aeolian sand mechanical properties micro morphology phase composition

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Process Evaluation, Tensile Properties and Fatigue Resistance of Chopped and Continuous Fiber Reinforced Thermoplastic Composites by 3D Printing

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Journal of Renewable Materials 2022年第2期10卷 329-358页

作者： Wei Chen Qiuju Zhang Han Cao Ye Yuan School of Mechanical Engineering Jiangnan UniversityWuxi214122China Jiangsu Province Key Laboratory of Advanced Food Manufacturing Equipment and Technology Jiangnan UniversityWuxi214122China

The aim of this article was to comprehensively evaluate the manufacturing process,tensile properties and fatigue resistance of the chopped and continuous fiber reinforced thermoplastic composites(CFRTPCs)by 3D *** main results included:the common defects of the printed CFRTPCs contained redundant and accumulation defects,scratch and warping defects;the continuous fiber contributed to the dimensional stability and accuracy of width and thickness;associations between mass percentage of fiber reinforcement and the averages of elastic mod-ulus,strain at break and ultimate tensile strength were approximately linear based on tensile test results;the fati-gue resistance improved with the increasing fiber reinforcement based on fatigue test *** for specimens with four fiber rings,there was a good linear relationship between the stress level and logarithm value of cycles during the whole life while those of pure matrix and specimens with one and two fiber rings were piecewise linear,taking about 10,000 cycles as *** micro morphology showed that the fatigue failure behaved as matrix fracture,large and small fiber bundles and single fibers extracted from *** the tension-tension fatigue load,the deformations where easily concentrating stress behaved as sunken surfaces along thickness and width directions,and the deformation along width direction was greater than that along thickness direction.

关键词： CFRTPCs 3D printing tensile test fatigue behavior stress level micro morphology

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