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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...的工业化方向发展. REFERENCES [1] JANNEY M A. Method for molding ceramic powders: US 4894194[P]. 1990-01-16. [2] JANNEY M A, OMATETE O O. Method for molding ceramic powders using a water-based gelcasting......
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...对于热障涂层的使用寿命非常重要.合金组元中Ni,Co或Ni+Co是涂层的基体元素, Co的抗热腐蚀性能优于Ni, 但抗氧化性能不如Ni, Ni+Co的组合有利于涂层的综合抗腐蚀(氧化)性能；并且Co质量百分比在20%~26%时, Ni+Co组合的涂层具有最佳的韧性.组元中Cr是用于保证涂层的抗热腐蚀 性,Al是用于提供涂层的抗氧化性.在Ni基高温合金中, Cr和Al都是固溶强化元素, Al还是γ......
(vdW),全面地研究各种掺氮型碳材料与多硫化锂之间的有效锚定作用,结果发现吡啶型氮掺杂的石墨烯团簇更有效抓固多硫化锂(见图1(a)),其他研究者也发现氮掺杂石墨烯有利于吸附多硫化物得到相似结论[32-33].另外发现石墨烯中氧元素存在也有利于多硫化锂的吸附[34-35]. 碳质材料的双掺杂多数在N,B,O,P等元素中筛选.LI等[36]计算N,B共掺杂石墨烯复合正极对多硫化物的吸附过程发现在Li-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......
presented in Ref. [52] consists of a wrapped screen mesh, made of single-plaited stainless steel. Stainless steel is a steel alloy composed of iron and different proportions of chromium, which is responsible......
in the nuclear environment, such as B, P, LI [11, 12]. 2) The coating material itself and its oxidation products have low-oxygen permeability and good high-temperature stability in the case that the excessive... on graphite substrate used in HTR [29]. The structure is shown in Figure 2(b). The basic design concept for this study is that the outer p-SiC layer is as the main functional layer to protect matrix graphite......
testing procedure. In addition, it is environmentally significant to carry out this research as the silica fume is the waste from the metal and alloy production industry, while nano- silica can... in the city of Edmonton, Canada [J]. Sustainability, 2018, 10(2). DOI: 10.3390/su10020517. [3] CARATELLI A, MEDA A, RINALDI Z, ROMUALDI P, Structural behaviour of precast tunnel segments in fiber......
)所示,该方案由燃料反应器和氧化反应器组成,使用具有催化能力的双功能载氧体,燃料反应器内通入的反应气为CH4,CO2与O2混合气,首先CH4和CO2在Ni催化剂表面发生重整反应得到合成气,部分合成气与纯氧燃烧提供热量,剩余合成气可以使载氧体深度还原,氧化反应器中深度还原的载氧体与CO2反应生成CO,该工艺可以在实现自热的同时转化更多的CO2.SPALLINA等[33]将化学链燃烧工艺与甲烷干重整进行...算 常用的载氧体为Fe,Co,Ni,Cu和Mn的氧化物,在600~1 200 ℃下CH4与常见氧化物的反应热力学数据如图3所示,lg K越大说明金属氧化物与CH4反应越容易,MnO2/Mn2O3,Mn2O3/Mn3O4,Co3O4/CoO,CuO/Cu2O比Fe2O3/Fe3O4和NiO/Ni更容易氧化CH4,并且Fe2O3/Fe3O4,Mn2O3/Mn3O4,CuO/Cu2O和NiO/Ni都可以......
alloy surface is more conducive to the proliferation of osteoblasts [22]. Table 3 Effects of sintering temperature on porosity, density, and flexural properties of 3DP HAAW composites Table 4...] SACHS E M, HAGGERTY J S, CIMA M J, WILLIAMS P A. Three-dimensional printing techniques: US, 5204055A [P]. 1993-04-20. [5] HWA L C, RAJOO S, NOOR A M, AHMAD N, UDAY M B. Recent advances in 3D printing......
Zhi-guang, et al. Reduction kinetics of Fe2O3-NiO composites for production of Fe/Ni alloy using hydrogen under non-isothermal conditions[J]. The Chinese Journal of Nonferrous Metals, 2017, 27(1...压的一级反应,其速率函数可表示为: r=ka[H2]·(p(H2)-p(H2O)/KH) 式中:速率常数ka[H2]= 1.6×10-6；KH为气体中H2O与H2的分压比p(H2O)/p(H2). 不同渣系中,H2对熔融铁氧化物的还原反应速率也存在差异,在一定范围内随着渣中CaO含量增加,反应速率提高,而SiO2含量增加,反应速率则降低[18]. 不同研究者对于H2还原铁氧化物动力学机制的研究结果......
forces from rock blocks. Cutters today can either incorporate hard, fine grained carbides into the matrix of the disc material or apply a hardened coating of alloy powder on the steel substrate... generated by the impact can be expressed as: P=ρCV where P is the pressure; ρ is the density of the liquid; C is the compressional wave velocity of the liquid and V is the impact velocity. In general......
