材料期刊网

THE INVESTIGATION ON PLASMA ARC TREATMENT OF CHROMIUM PLATED ALLOY STRUCTURE STEEL

X.M.Fan , J.W.Huang , K.H.Wang , Q.Liu

金属学报(英文版)

The technology of plasma arc was used to modify the interface adhesion between chromium coating and steel substrate. The interface microstructure was studied as a function of plasma arc processing parameters. Microstructure analysis was performed by optical microscopy, scanning electron microscopy and electron probe. The microhardness distribution along the depth of a cross-section of the chromium coating and the substrate was measured. The results show the energy density of transferred plasma arc is obviously higher than plasma non-transferred arc. The molten interface wasbetween chromium coating and steel substrate obtained by plasma transferred arc. Interfaces between chromium coating and steel substrate can be divided by plasma non-transferred arc into three classes: non-molten, a little molten and molten. Good interface bonding was obtained by proper process parameters. The microhardness of chromium coating decreases with increasing energy density of plasma arc.

关键词: plasma transferred arc , null , null

H-K法研究ACFs的微结构

陆安慧 , 郑经堂 , 王茂章 , 樊彦贞

新型炭材料 doi:10.3969/j.issn.1007-8827.2000.01.005

ACFs的吸附性能主要取决于比表面积和孔隙结构,在不同相对压力下的吸附行为对应不同的孔隙结构.在一定范围内微孔是决定吸附能力大小的重要因素.以N2吸附等温线为依据,采用H-K法考察了不同比表面积ACFs在微观结构以及吸附性能上的差异.采用BET法计算比表面积,Hovath-Kawazoe方程表征微结构.研究表明ACFs含有大量的小于0.7 nm的极微孔,这些极微孔对吸附等温线的贡献较大,并且在吸附过程中赋予ACFs分子筛特性.同时发现随着ACFs比表面积的增加极微孔的分布相应变宽.

关键词: 表面积 , 吸附等温线 , 极微孔 , 孔分布

Two-step magnetization in a spin-chain system on the triangular lattice: Wang-Landau simulation

Physical Review B

The Wang-Landau algorithm is used to study the thermodynamic and magnetic properties of triangular spin-chain system based on two-dimensional Ising model in order to understand the magnetic-order dynamics in Ca(3)Co(2)O(6) compound. The calculated results demonstrate that the equilibrium state of the rigid spins produces the two-step magnetization curve at low temperature even when the random-exchange term is considered. This work indicates that the four-step magnetization behavior observed experimentally must be due to the nonequilibrium magnetization.

关键词: calcium compounds;exchange interactions (electron);Ising model;magnetisation;thermodynamics;one-dimensional ca3co2o6;density-of-states;compound ca3co2o6;phase-diagram;proteins;crystal

Dendritic coarsening of gamma ' phase in a directionally solidified superalloy during 24,000h of exposure at 1173 K

Materials Characterization

Dendritic coarsening of gamma' was investigated in a directionally solidified Ni-base superalloy during exposure at 1173 K for 24,000 h. Chemical homogeneity along different directions and residual internal strain in the experimental superalloy were measured by electronic probe microanalysis (EPMA) and electron back-scattered diffraction (EBSD) technique. It was indicated that the gradient of element distribution was anisotropic and the inner strain between dendrite core and interdendritic regions was different even after 24,000 h of exposure at 1173 K, which influenced the kinetics for the dendrite coarsening of gamma' phase. (C) 2010 Elsevier Inc. All rights reserved

关键词: Superalloy;Coarsening;Exposure;Segregation;ni-base superalloy;evolution;field

K2CaB8O26H24晶体的生长及其性质的研究

罗将 , 潘世烈 , 韩健

人工晶体学报

采用室温溶液法生长K2CaB8O26H24晶体,并得到尺寸为11mm×6 mm×5 mm的单晶.该晶体属于正交晶系,P212121空间群,晶胞参数为a＝1.15520(2)nm,b＝1.24751(3)nm,c＝1.65768(4)nm.红外光谱测量证实晶体结构中含有BO33-和BO54-基团.透过光谱表明K2CaB8O26H24晶体紫外吸收边在200nm左右.K2CaBsO26H24晶体粉末倍频效应(SHG)测试表明该化合物具有倍频效应,信号强度约为KH2PO4晶体的0.3倍.

关键词: 室温溶液法 , K2CaB8O26H24 , 倍频

冷却速率对GWZ1032K合金中14H-LPSO结构形成的影响

张松 , 袁广银 , 卢晨 , 丁文江

金属学报 doi:10.3724/SP.J.1037.2010.00177

采用金属型铸造和慢速凝固,在不同冷却速率下制备了Mg-10Gd-3Y-1.8Zn-0.5Zr(质量分数,%)(GWZ1032K)合金.采用SEM,TEM和XRD研究了冷却速率不同的GWZ1032K合金的组织和相构成.在GWZ1032K合金中,α-Mg基体中的层片状14H-LPSO结构随着冷却速率的下降而增加,在冷却速率为0.005℃/s的试样中充满了整个晶粒;随着合金冷却速率降低,GWZ1032K合金中晶界第二相分别由5℃/s时的(Mg,Zn)3RE相转变为0.5和0.1℃/s时的(Mg,Zn)3RE相和14H-LPSO结构的X相共存;在0.01和0.005℃/s时只有14H-LPSO结构的X相.结果显示在接近于平衡凝固的缓慢冷速条件下,更容易形成具有稳定结构的层片状14H-LPSO结构和X相.在冷却速率为0.5和0.1℃/s时,(Mg,Zn)3RE共晶相和X相共存,(Mg,Zn)3RE共晶相和X相的位向关系为[110]xphase//[(2)23](Mg,Zn)3RE和∠g(001)xphase g(110)(Mg,Zn)3RE=8.4°.

关键词: 14H-LPSO结构 , 冷却速率 , Mg-Gd-Y-Zn合金 , X相

三元体系Rb+∥Cl-,Borate-H2O 348 K稳定相平衡研究

刘舟 , 曾英 , 于旭东

稀有金属 doi:10.3969/j.issn.0258-7076.2013.01.019

采用等温溶解平衡法研究了三元体系Rb+∥Cl-,borate-H2O 348 K时的稳定相关系.测定了该三元体系348 K时的平衡液相组成和主要物化性质(密度、折光率).根据实验数据绘制了相应的等温溶解度图,物化性质-组成图.研究发现:该体系属于简单共饱型,无复盐或固溶体形成.相图含有1个共饱点,2条溶解度单变量曲线以及2个单盐结晶相区,分别对应RbCl和RbB5O8 ·4H2O结晶区.该体系RbCl结晶区面积小,溶解度大;RbB5O8 ·4H2O结晶区面积大,溶解度小.平衡液相的密度和折光率随着RbCl含量的增大而增大,在共饱点E处达到最大值.

关键词: 溶解度 , 相平衡 , 铷 , 硼酸盐

[H(4,4'-bpy)]2[K2Mo8O26]的水热合成和结构研究

陈义平 , 张汉辉 , 黄长沧 , 杨齐瑜 , 孙瑞卿

功能材料

采用水热法合成了[H(4,4'-bpy)]2[K2Mo8O26],X-ray单晶结构解析表明:该化合物属三斜晶系,空间群:P-1,晶胞参数:a=0.78029(8)nm,b=0.98715(8)nm,c=1.32438(6)nm,α=99.383(3),β=102.0600(19),γ=108.090(2),β-[Mo8O26]单元通过部分端氧原子与K原子相连成层状,4,4'-联吡啶中质子化的N原子与非质子化的N原子通过氢键联成链状,链与链之间通过π-π堆垛成层状结构.

关键词: 水热合成 , 钼酸盐 , 钾 , 晶体结构

冷却速率对GWZ1032K合金中14H-LPSO结构形成的影响

张松袁广银卢晨丁文江

金属学报 doi:10.3724/SP.J.1037.2010.00177

采用金属型铸造和慢速凝固, 在不同冷却速率下制备了Mg-10Gd-3Y-1.8Zn-0.5Zr(质量分数, %) (GWZ1032K)合金. 采用SEM, TEM和XRD研究了冷却速率不同的GWZ1032K 合金的组织和相构成. 在GWZ1032K合金中, α-Mg基体中的层片状14H-LPSO结构随着冷却速率的下降而增加, 在冷却速率为0.005℃/s的试样中充满了整个晶粒;随着合金冷却速率降低, GWZ1032K合金中晶界第二相分别由5℃/s时的(Mg, Zn)₃RE相转变为0.5 和0.1℃/s时的(Mg, Zn)₃RE相和14H-LPSO结构的χ相共存;在0.01和0.005℃/s时只有14H-LPSO结构的$\chi$相. 结果显示在接近于平衡凝固的缓慢冷速条件下, 更容易形成具有稳定结构的层片状14H-LPSO结构和χ相.在冷却速率为0.5和0.1℃/s时, (Mg, Zn)₃RE共晶相和χ相共存, (Mg, Zn)₃RE共晶相和χ相的位向关系为 [110]_{χ phase}//[223]_{(Mg, Zn)3RE}和∠g(001)_{χ phase} g(110) _{(Mg, Zn)3RE}=8.4°.

关键词: 14H-LPSO结构 , solidification rate , Mg-Gd-Y-Zn alloy , χ phase

稀土杂多配合物K15[Ce (BW11O39)2]·17H2O与BSA的相互作用

曾芳 , 杨昌英 , 潘家荣 , 赵儒铭 , 周百斌

稀土 doi:10.3969/j.issn.1004-0277.2006.04.002

利用紫外光谱,以曙红Y(Eosin Y)为探针,考察了稀土杂多配合物K15[Ce(BW11O39)2]·17H2O与牛血清白蛋白(BSA)间的作用,K15[Ce(BW11O39)2]·17H2O与Eosin Y在BSA上有竞争结合,表面活性剂对两者间的竞争结合有增敏作用;并利用荧光光谱直接考察了K15[Ce(BW11O39)2]·17H2O与BSA的相互作用及其对BSA构象的影响.

关键词: 稀土杂多配合物 , 牛血清白蛋白 , 曙红Y(Eosin Y) , 紫外光谱法 , 荧光光谱法