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alloy moulds (120 mm×20 mm×20 mm) and cylindrical moulds (Φ20 mm×20mm). Subsequently, they were placed in an electric blast dryer and dried at 60 °C for 48 h. After drying, they were demoulded and baked... was studied by orthogonal test. The results showed that when the mass ratio of LPG powder was higher than or equal to 20 wt% and the sintering temperature was higher than or equal to 550 °C, mutual......
对每个区域采用不同能量进行冲击试验,如图5所示.在对冲击后的试件采用超声C扫描进行检测时发现:当冲击能量不高时,冲击后的试样表面虽然没有明显损伤,但内部已经出现了基体开裂与分层现象；随着冲击能量的提高,层合板的内部损伤进一步而扩大；直至冲击能量高于渗漏阈值时,层合板出现渗漏.对于产生渗漏现象的试样,其内部虽然没有出现明显的纤维损伤,但树脂基体开裂与分层损伤已相互连通,形成了贯穿试样厚度方向的渗漏通... A, GUZMAN J C, DILLON A K, et al. Design, manufacture and test of cryotank components[J]. Materials Science and Materials Engineering, 2018, 3: 153-179. [5] SIPPEL M, KOPP A, MATTSSON D, et al. Final......
and improves the adsorption performance of fluoride. Also, the diacetylene linkages (-C≡C-) and pyridinic-N were studied to understand their influences on removing fluoride. The result indicates that carbon..., and reacted in an electric blast drying oven at 220 °C, and cooled at room temperature to obtain a pure white product. The product was then washed repeatedly 6 times with ultra-pure water and anhydrous......
and lubrication-film pressure. The following film-thickness equation was presented in Ref. [29]: (24) where c is the radius clearance of the external return spherical hinge pair, c=RM-R, 2.5 Dimensional normalization Dimensionless parameters: (25......
层的强度极限时,铝层开始颈缩并产生裂纹,同时界面裂纹沿拉伸方向迅速扩展,随后IF钢单独伸长变形直至断裂.王传杰等[12]研究了Cu/Ni复合箔的界面变形行为,基体层间的力学性能差异导致Cu/Ni界面的微孔缺陷处最先萌生裂纹,当界面裂纹大量合并和纵向扩展时,基体层开始发生颈缩和断裂.皇涛等[13]通过扫描电镜表征研究了钛/铝复合板原位拉伸加载过程的损伤演化行为,裂纹在复合界面区的金属间化合物层中萌生... Fang-fang, et al. Interactive effects of microstructure and interface on tensile deformation behaviors of Cu/Ni clad foils[J]. Materials Science and Engineering A, 2018, 714: 14-24. [13] 皇 涛, 王 锟, 陈拂晓......
, SOH A K. Molecular dynamics simulations of mechanical properties for Cu(001)/Ni(001) twist boundaries[J]. Computational Materials Science, 2017, 137: 85-99. [15] PAUL S K. Effect of twist boundary... temperature molecular dynamics methods[J]. Chem Phys, 1984, 81(1): 511-519. [27] FOILES S M, BASKES M I, DAW M S. Embedded-atom-method functions for the fcc metals Cu, Ag, Au, Ni, Pd, Pt......
J. Cent. South Univ. (2020) 27: 629-673 DOI: https://doi.org/10.1007/s11771-020-4322-1 Decision making tools for optimal material selection: A review Divya ZINDANI, Saikat Ranjan MAITY, Sumit BHOWMIK Department of Mechanical Engineering, National Institute of Technology Silchar, Silchar,Assam-7880......
for aqueous gelcasting alloy Ni-362-3 STAMPFL等[65]将MoldSDM(Mold shape deposition manufacturing)模具制造工艺与凝胶注模成型技术相结合,在快速分层制备的腊模内通过浇注高固相体积分数的金属粉末料浆,成功制备出形状复杂的不锈钢叶轮,烧结后该叶轮的微观结构及力学性能优良,可与传统粉末冶金工艺制件媲美.图4中(a),(b)和(c)所示分别为MoldSDM模具制造工序,该工艺制备 的蜡模和采用该工艺与凝胶注模结合制备的不锈钢叶轮. 图4 MoldSDM模具制造工序[65] Fig.4 Processing steps for MoldSDM (a), section of wax mold(b)and stainless steel impeller(c......
改进型铝化物涂层,如Al-Cr,Al-Si,Al-Ti,Pt-Al,其中以镀Pt渗Al形成的铂铝化物涂层具有更长的使用寿命而倍受欢迎,进而成为研究的热点,至今仍有相关报道. 以上两代涂层均属于扩散涂层, 这些涂层在航空发动机上得到了一定的应用[4-5] . 第3代涂层,20世纪80年代发展了可以调整涂层成分,能在更高温度下起到高温抗氧化作用的等离子体喷涂MCrAlY涂层(M代表Fe,Co,Ni... and disadvantages of ceramic materials used as TBC 2.2 氧化锆的基本物理化学性质 氧化锆是一种耐高温的氧化物,熔点是2 680 ℃,热导率是14 W/(K?m), 线膨胀系数是11×10-6~13×10-6 K-1,弹性模量是190 GPa.ZrO2的晶型有3种,即单斜(m),四方(t)和立方(c).常温条件下,稳定相为单斜晶......
解多硫化物的溶解及扩散,减少活性材料的损失.目前掺杂碳质材料方式:单元素(以氮为主),双元素掺杂及多元素掺杂,主要分析改性后碳质材料与多硫化物的相互作用. 通过单元素掺杂改性碳基底变为极性材料,PENG等[27]利用密度泛函理论(DFT)研究掺杂元素的纳米碳基底(CNTs,OCNTs,NCNTs)与多硫化锂的相互作用,发现同主客体之间(掺杂N的C/S界面)相互作用增强,掺杂O,N元素后碳基底与多硫...-N和S-B间形成强相互作用,有效抑制穿梭效应(见图1(b)).当N,O共掺杂石墨烯复合后研究发现放电过程中有利于短链多硫化物形成,有效减缓穿梭效应[37]；GU等[38]将N,P共掺杂石墨烯发现也有类似结论.针对碳纳米管,JIN等[39]用 B,O共掺杂复合到CNT计算发现双掺杂后可提供丰富吸附位点,与多硫化物形成很强化学吸附作用. 多元素碳质材料掺杂研究较少,CHEN等[40]研究含C,O,N......
