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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......
, 27(2): 282-288. SHEN Ding, YANG Shao-bin, LI Si-nan, SUN Wen, TANG Shu-wei. Calculation and prediction of lithium insertion properties and elastic properties for Sn-Li alloy based on first-principle..., LI Si-Nan, SHEN Ding, TANG Shu-wei, SUN Wen, CHEN Yue-Hui. First-principles study of Na storage in bilayer graphene with double vacancy defects[J]. Acta Phys-Chim Sin, 2017, 33(3): 520-529. [23......
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......
to the excessive consumption of the outer Cr-Al-Si alloy coating and there are also some defects appearing in the SiO2 glass layer. SHI et al [67] prepared a La-Mo-Si-O-C coating on the surface of porous SiC pre... the coating and the substrate and alleviate the stress in the thermal shock cycle. The most common used material is C/SiC coating [15-17]. The gradient distribution of Si and C elements......
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... than the theoretical values suggest that only part of the silica fume was reacted. Another contributing reason for the reduced bulk density is the generated low Ca/Si CSH. The CSH generated from......
100%的Cu和95%的Li被浸出,Mn的浸出率也超过了70%,而Al,Ni以及Co的浸出率只有40%左右.经分析发现,黑曲霉代谢活动中产生的有机酸主要包括柠檬酸,苹果酸,草酸和葡萄糖酸等,其中柠檬酸对金属的浸出率贡献最大. 尽管通过一些离子的催化作用或者改变菌种体系可以使一些金属的浸出率显著提高,但生物浸出方法仍然难以在工业中大规模应用,其原因是:一方面,菌种难培养不易存活,对生长环境要求高；另...现Co,Ni以及Cu的高效浸出,而Mn和Al基本不被浸出. 2.5 辅助强化浸出 一般地,酸浸出和氨浸出都需要较长的浸出时间和较高的浸出温度.为了提高金属的浸出效率,可采用一些辅助方法来增强浸出.常见的辅助浸出手段有超声辅助以及机械化学辅助[71-72]. JIANG等[71]以H2SO4作为浸出剂,H2O2作为还原剂从废旧LiCoO2中浸出Li和Co.在浸出温度为30 ℃和浸出时间为30 min......
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...能力从高到低依次为NiFe2O4,NiO-Fe2O3,Fe2O3,NiO,NiFe2O4中Fe和Ni协同作用导致NiFe2O4氧化还原能力强,虽然NiFe2O4在循环过程中无法完全再生,但是在10次循环过程中具有较好的稳定性.ZENG等[94-95]制备了CoFeAlOx尖晶石型载氧体,通过控制还原深度可以有效提高载氧体的稳定性,并通过掺入不同量的Ni,Cu和Co实现了尖晶石载氧体低温深度还原.六......
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...): 3380-3386. DOI: 10.1016/ j.jeurceramsoc.2019.04.043. [33] DING Guo-jiao, HE Ru-jie, ZHANG Ke-qing, ZHOU Ni-ping, XU Hao. Stereolithography 3D printing of SiC ceramic with potential for lightweight......
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...原产物磨矿时间10 min,磁场强度0.156 T的优化条件下,可获得镍品位5.64%,镍回收率83.59%的镍铁产品.丁志广等[57-58]对H2还原红土镍矿过程进行了详细分析,发现在小于600 ℃ 的低温条件下,镍,铁的金属化率随温度升高呈现提高的趋势；实验所采取的氢气浓度(20%~100%)及矿物粒度(0.15~0.83 mm)条件对镍,铁金属化率的影响并不显著；对含Ni 0.82%,Fe......
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......
