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Ir/Mo互扩散研究

陈松 , 胡昌义 , 郭俊梅 , 杨家明

稀有金属材料与工程

研究了Ir/Re喷管制备过程中的Ir/Mo互扩散问题.在电子探针测量的基础上,根据扩散理论和Ir-Mo相图数据,建立并推导Ir/Mo扩散模型和解.计算得到Ir3Mo相中的互扩散系数为:D=9.0×10-9exp(-1.46 eV/kT)(cm2/s),Ir基固溶体中的互扩散系数为:D=5.0×10-10exp(-1.1eV/kT)(cm2/s).确定喷管中Ir/Mo互扩散的特点,给出估算Ir3Mo相层厚的方法.确定Re在Ir3Mo相中的扩散主要是受Ir控制.

关键词: Ir , Mo , Re , 扩散

PSZ/Mo功能梯度材料

李云凯 , 王勇 , 李树奎 , 韩文波

复合材料学报 doi:10.3321/j.issn:1000-3851.2003.06.009

利用有限元分析方法,对PSZ/Mo功能梯度材料进行了优化设计,确定了最佳形状因子、层数和每一层的厚度.在此基础上,用热压烧结方法制备了六层结构的PSZ/Mo功能梯度材料.利用自制的FGM热性能测试仪,对制备的试样进行了热震性能实验,通过该实验条件下应力场和温度场的有限元计算,阐述了PSZ/Mo功能梯度材料优良抗热震性的原因.

关键词: 优化设计 , 有限元 , PSZ/Mo功能梯度材料

Mo纳米晶热学特性

郑瑞伦 , 李建 , 梁一平 , 胡先权

材料研究学报

介绍了Mo纳米晶的制备过程及用自动扫描量热法(DSC)测量热学参数的结果在实验基础上,用计算机对比热曲线进行数学模拟,确定热力学函数,探讨结构相变问题.

关键词: Mo超微粒 , null , null

Mo的表面脉冲激光氮化

吴嘉达 , 吴凌晖 , 伍长征 , 李富铭 , 宋宙模

材料研究学报

激光脉冲辐照置于氮气中的MO,使表面形成含γ-Mo2N的氮化层、激光使Mo表面熔化导致液相氮化反应用SEM.XRD和AUGER谱分析表征了氮化层.激光在表层引起的加热和激波效应还有使表层微观组织致密的作用

关键词: Mo激光氮化 , γ-Mo_2N , shock wave

SYNTHESIS OF Ni-Mo ALLOYS BY MECHANICAL ALLOYING

LIANG Guoxian WANG Erde HUO Wencan Harbin Institute of Technology , Harbin , China Post Box 435 , Harbin Institute of Technology , Harbin 150006 , China

金属学报(英文版)

Ni_(100-x)Mo_x(x=20,30,38)alloys have been synthesized by mechanical alloying.The structure evolution of powders in mechanical alloying process has been monitored by X-ray diffraction,scanning electron microscopy and transmission electron microscopy analyses.The results show that the Ni_(62)Mo_(38)sample becomes partially amorphous after high energy ball milling,while the Ni_(80)Mo_(20)and Ni_(70)Mo_(30)become non-equilibrium nanocrystals.

关键词: mechanical alloying , null , null , null

Mo表面Mo(Si,Al)2层的制备及抗高温氧化性能

李雪 , 卢公昊 , 王淼 , 高田润

材料与冶金学报 doi:10.14186/j.cnki.1671-6620.2015.02.011

利用Al-Si混合粉末包覆金属Mo,并在Ar气氛围中,900℃进行高温扩散反应,在金属Mo表面制备Mo(Si,Al)2化合物层.在空气中12 00℃的条件下进行的高温氧化试验表明,化合物Mo(Si,Al)2具有优异的抗氧化性,样品外表面生成了致密的氧化铝层,从而阻止样品内部被进一步氧化.另外,氧化试验后在基体MoMo (Si,Al)2层界面处还观察到Mo5(Si,Al)3层和Mo3 Al8层.

关键词: 金属Mo , Mo(Si,Al)2 , 粉末包覆法 , 高温抗氧化性

Mo原子溅射能量对Mo/Si薄膜微结构的影响

秦俊岭 , 易葵 , 邵建达

功能材料与器件学报 doi:10.3969/j.issn.1007-4252.2006.02.001

用磁控溅射法制备了Mo/Si薄膜,用AFM和XRD分别研究了Mo原子的溅射能量不同时,Mo/Si薄膜表面形貌和晶相的变化.通过比较发现,随着Mo原子溅射能量的增大,Mo/Si薄膜表面粗糙度增加,Mo和Si的特征X射线衍射峰也越来越强,并且Mo膜层和Si膜层之间生成了MoSi2.Mo原子的溅射能量是诱导非晶Si结晶和MoSi2生成的主要原因.

关键词: Mo/Si , MoSi2 , 溅射能量

Magnetic properties of YFe(12-x)Mo(x) compounds and magnetocaloric effect of YFe(9.5)Mo(2.5)

Journal of Magnetism and Magnetic Materials

The characterization and magnetic properties of YFe(12-x)Mo(x) (x=2.0, 2.5 and 3.0) with the ThMn(12)-type structure, and the magnetocaloric effect of YFe(9.5)Mo(2.5) were investigated. A directional growth was observed in YFe(10)Mo(2) alloy. A broad peak in the zero-field-cooling (ZFC) magnetization curve of the YFe(12-xx)Mo(x) compounds is ascribed to the existence of ferromagnetic clusters with different site moments and scattered orientations of the moments. The broad range of the peak is reduced with increasing Mo content. A weak peak is observed near 190 K in the ZFC curve of YFe(9)Mo(3), which is associated with the 8i sites being mostly occupied by Mo atoms. YFe(9.5)Mo(2.5) has a magnetic entropy change of -1.09 J/kg K for a field change of 5 T at 277 K. (C) 2010 Elsevier B.V. All rights reserved.

关键词: Magnetic property;Magnetocaloric effect;YFe(12-x)Mo(x);transition;alloys

Effect Of Mo And Mo2c On Themicrostructure And Properties Of The Cermets Based On Ti(C,N)

S.Q. Zhou , W. Zhao , W.H. Xiong , Y.N. Zhou , null , null , null , null

金属学报(英文版)

Effect of Mo and Mo2C on the microstructure and properties of Ti(C,N)-based cermets was investigated in this article. The results have indicated that the weight percentage of Mo from 5 to 10 can reduce Ti(C,N) grain diameter and thickness of the rim, and Ti(C,N) grain can be wetted by Ni-Cu-Mo liquid so as to get small contiguity of Ti(C,N) grain. In that way, the transverse rupture strength of Ti(C,N)-based cermets has reached 1800—1900 MPa; the fracture toughness has been due to 16—18 MPa m1/2. But 15wt pct Mo was not more effective on Ti(C,N)-based cermets, because the thickness of the rim becomes larger. In the circumstance of Mo 2 C, 5 wt pct Mo 2 C was good for microstructure and properties of Ti(C,N)-based cermets, but 11 wt pct Mo 2 C has resulted in larger contiguity of Ti(C,N) grain and big Ti(C,N) grain diameter so as to reduce transverse rupture strength and fracture toughness. So that, the effect of Mo on Ti(C,N)-based cermets is better than Mo 2 C.

关键词: Transverse rupture strength (TRS) , null , null

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