郭华
,
苍大强
,
白皓
,
宗燕兵
物理测试
往不锈钢渣中混入氧化物磨成粉体，通过分析其粒度分布与比表面积，用DTA曲线确定工艺制度，烧制了陶瓷坯体样品，得出了粉体必须在杂质含量<1%，Cr2O3在2%~3%之间，渣量不超过30%的情况下，才能烧制出吸水率与显气孔率符合基本性能要求的陶瓷坯体。
关键词:
不锈钢渣
,
oxide
,
DTA
,
ceramic
张匀
,
赵洪恩
,
郭建亭
金属学报
<正> 为了节省能源,国内外广泛开展了煤的流化床燃烧技术的研究。然而,流化床中埋管材料及其上面所焊鳍片材料耐高温磨蚀性能的提高,是推广这一技术的关键。采用共沉法或机械合金化方法已成功地制成氧化物弥散强化高温合金,不仅高温强度可以维持到合金的熔点附近,而且可以改善高温耐磨性,但这类合金制造工艺复杂、成本高,不适宜大量用于能源工业。向钢水中吹喷氧化物质点可以明显提高镇静钢的室温和高温强度,而且价
关键词:
高温耐磨
,
Fe-base alloys
,
oxide
,
injection
Z. T. Ma and D. Janke(Institute of Iron and Steel Technology
,
Freiberg University of Mining and Technology
,
Germany)
金属学报(英文版)
Useder certain conditions, nonmctallic inclusions such as oxides, sulfides, nitrides and carbides are no longer harmful to sted service properties. With the new concept of oxide metallurgy, these properties can be improved by generating fine oxide inclusions which serve as heterogeneous nuclei for sulfide and fine ferrite[1-4]. A novel continuous casting (CC) process is expected to be created with the utilization of oxide metallurgy. This is also useful for the forthcoming technologies of direct rolling and near-net-shape casting. The main idea of oxide metallurgy consists of an alternative oxidation technology. It is based on steels treated by complex metals such as Ti, Zr, Ti-Zr alloys and rare earth metals. The selected deoxidants should follow the required conditions which are concluded in this paper.
关键词:
oxide
,
null
,
null
,
null
Ting YU
,
Zexaing SHEN
材料科学技术（英文）
Metal oxide nanostructures (CuO, Co3O4, ZnO and α-Fe2O3) have been successfully fabricated by a simple and efficient method: heating the appropriate metals in air at low temperatures ranging from 200 to 400℃. The chemical composition, morphology and crystallinity of the nanostructures have been characterized by micro-Raman spectroscopy, X-ray diffraction, scanning electron microscopy and transmission electron microscopy. Two mechanisms: vapor-solid and surface diffusion play dominant roles in the growth of metal oxide nanostructures starting with low melting point metals (Zn and Cu) and high melting point metals (Fe and Co), respectively. With sharp ends and large aspect ratio, the metal oxide nanostructures exhibit impressive field-induced electron emission properties, indicating their potentials as future electron source and displays. The water wettability and anti-wettability properties of iron oxide nanoflakes were also discussed in this work.
关键词:
Metal oxide
,
oxide
,
nanostructures
,
field
,
emiss
Huiping BAI
,
Fuhui WANG
材料科学技术（英文）
The electrochemical behaviors of high temperature oxide film formed on the sputtered microcrystalline coating of M38 alloy (mc-M38) were investigated by potentiodynamic and electrochemical impedance spectroscopy (EIS) techniques in 3.5% NaCl solution. Mott-Schottky analysis was used to study the semi-conductive properties of the surface oxide. The results of the capacitance measurements showed that the oxide films on both the coating and the cast alloy were p-type semiconducting characteristics. Both the carrier density (Na) and the flat band potential (Efb) were obviously frequency-dependent, and the optimal frequency range was from 1000 to 1500 Hz. The oxidized coating exhibited higher protectivity than the oxidized cast alloy due to the lower carrier density compared with that of the oxidized cast alloy. The EIS data of the long-term immersing tests suggested that the oxide film served as an inner-barrier layer against chloride ions. The penetration of the aggressive ions into the surface oxide resulted in the decreased polarization resistance as a function of the immersion time.
关键词:
High temperature oxide film
,
temperature
,
oxide
,
film
,
Protective
,
p
李刚
,
陈苏
,
材料导报
采用共沉淀法制备了细的Ce0.8Y0.2O1.9(YDC)粉末,并将其应用于钴掺杂的YDC电解质材料.研究了钴元素对材料烧结性能和电性能的影响.结果表明,钴元素显著增加了材料的密度(烧结温度在1000℃时,其密度超过理论密度的98％)和电导率(750℃时0.99 S/m),同时还发现小于1μm尺寸的晶粒具有高的电导率.
关键词:
电解质
,
氧化物
,
化学合成
,
共沉淀
,
密度
,
电导率
,
烧结温度
张龙姣
,
张阳德
,
申玉璞
,
申玉坤
材料导报
制备了负载阿霉素的叶酸修饰的氧化石墨烯材料,并对其性能进行研究.首先制备由叶酸修饰的氧化石墨烯,记为FA/GO,然后将该复合物对药物阿霉素进行负载,记为FA/GO/DOX,通过与空白组(FA/GO)的对比分析,观察其药物负载和释放行为,选择Hela细胞作为模型进行细胞实验,考察其细胞形态、细胞毒性和生物安全性,对FA/GO/DOX载药系统的靶向性、细胞毒性和安全性能进行研究和评价,发现该材料性能良好,具有广阔的应用前景.
关键词:
氧化石墨烯
,
叶酸
,
阿霉素
,
载药
白英良
,
张海峰
,
贺连龙
,
韩立
稀有金属材料与工程
利用透射电子显微镜(TEM)及场发射电镜纳米尺度成分分析技术(EDS分析)研究块状非晶Zr_(70)Cu_8Ti_7Ni_(15)喷射电解腐蚀特征.结果表明:在喷射电解腐蚀过程中,非晶内少量纳米级别的晶体相对于块状非晶基体较容易被腐蚀破坏.此外,经高氯酸乙醇溶液电解腐蚀后非晶中明显存在一些特殊非晶区域,其中含有大量非晶态氧化物,Ni大量流失,这些区域的形成是由于Cl离子点蚀引起的.
关键词:
Zr基块状非晶
,
腐蚀
,
透射电子显微镜
,
氧化物
马腾
,
傅强
,
崔义
,
张镇
,
王珍
,
谭大力
,
包信和
催化学报
doi:10.3724/SP.J.1088.2010.90821
利用扫描隧道显微镜(STM)和X射线光电子能谱(XPS)对Pt(111)表面制备的Fe单层薄膜及其在不同环境气氛条件下的多种结构进行了研究.在温度为487K的Pt(111)表面制备出了完整的Fe单层薄膜Fe/Pt(111).对Fe/Pt(111)依次升高温度进行超高真空退火,STM和XPS结果表明退火温度高于800 K时,表面Fe原子扩散到次表层区域,形成次表层Fe结构Pt/Fe/Pt(111).Pt/Fe/Pt(111)在O_2氧化气氛中经850 K退火可转变成表面FeO薄膜FeO/Pt(111).FeO/Pt(111)结构在温和的H_2还原气氛中(600K)转变成表面Fe结构,进一步的还原处理(800K)则可以重新生成Pt/Fe/Pt(111).控制样品的环境气氛在O_2和H_2之间切换,使得表面Fe(FeO)和次表面Fe可以重复地转变.本研究实现了多种Fe-Pt表面结构的可控制备,可为合理地设计高效、价廉的催化剂提供借鉴.
关键词:
双金属催化剂
,
氧化物
,
Pt富集表面
,
反相模型体系
吕宝华
,
李玉珍
,
黄健
,
任晓娟
机械工程材料
采用固相反应法在800℃烧结制备出了不同锡掺杂量的(In1…Snx)2O3(x=0,0.01,0.02,0.05)粉体,通过X射线衍射仪(XRD)、拉曼光谱仪、傅里叶红外光谱仪(IR)、紫外吸收可见光谱(Uv-vis)分析仪以及扫描电镜(SEM)等对(In1-xSnx)2O3粉体的结构、光学性能和形貌进行了表征.结果表明:不同锡掺杂量的(In1-xSnx)2O3粉体都保持了In2O3的立方相晶胞结构;锡的掺杂改变了In2O3的紫外-可见吸收性能和红外吸收性能,抑制了In2O3粉体颗粒的长大,使其结构变得更加紧密.
关键词:
In2O3
,
锡掺杂
,
光学性能
,
形貌
