gineer, progress". M

.主任委员常镇有中钢集团吉林铁合金股份有限公司.副主任委员储少军北京科技大学高旭腾达西北铁合金有限责任公司浦国良上海申佳铁合金有限贵任公司黄海胜广西八一铁合金集团有限公司.查员(以姓氏笔划为序)王伦文陕西汉中铁合金有限公司王启民青海物通(集团)实业公司王贵生贵州龙里龙腾铁合金有限责任公司王德华首钢铁合金厂邓楚平湖南铁合金集团有限贵任公司史万利中钢集团吉林铁合金股份有限公司史建强山西忻州铁合金有限公司田征文廊坊市鑫达铁合金有限公司刘长河锦州铁合金集团有限责任公司刘长新中国金属学会刘桂山山东良达铁合金有限…     

美国发展4M DRAM,日本则发展16M DRAM

美国IBM公司发展的新4M DRAM片比原有1M片仅大35％,而却有原来4倍的信息量。片大小为6.3×12.3mm,存取信息快,读出1 bit数据仅65ns,而原来最好的约需80ns。以此速度全片4194304存储单元在1/4s内即可读出,此片功耗也低,它可以在3.3 V电源下工作,而比一般需5V电     

M16,M17捕收率剂对提高伴生金,银回收率的试验研究

Ｍ１６、Ｍ１７属于Ｍ系列新型捕收剂。根据凤凰山铜矿选矿厂矿石性质用工艺特点，确定以现场生产流程为基础，在半 先、混合浮选中用Ｍ１６、Ｍ１７代替原生产中用的ＯＳＮ－４３号、丁基铵黑药，通过小型试验、工业试验及生产试用结果表明，不仅可提高金、银、铜回收率为６．５％、４．３９％、０．３６％，而且能确保铜精矿品位，每年多创经济效益２００万元以上。     

LaNi4Al0.75M0.25(M=Mn,Sn,In,Ti,Zr)合金吸放氢性能研究

采用XRD及等容法研究了元素替代对LaNi4Al0.75M0.25（M=Mn,Sn,In,Ti,Zr）合金相结构、吸放氢动力学和热力学性能的影响。结果表明：Sn,In替代对合金的吸放氢平台压力影响不大,而Mn,Ti,Zr替代明显降低了合金的平台压力;5种合金的吸氢量按替代元素Mn〉In〉Sn〉Ti〉Zr顺序降低,XRD分析结果表明降低原因是元素替代后合金中形成了杂质相;合金主相的晶胞体积与热力学焓变ΔH的绝对值大小顺序按替代元素表示均为Mn〉Zr〉Ti〉Sn〉In,而熵变ΔS差异不大。     

Temperature dependence of heat capacity of Fe–M powder nanomaterials (M—C,Ge, Sn)

The heat capacity of mechanically activated nanocrystalline carbonyl iron and the sample of iron nanocomposite with the addition of isoelectronic sp-elements (C, Ge, Sn) with a grain size of the order of 2?5 nm is determined in a temperature range of 300–450 K using an IT-s-400 calorimetric device. Thermalphysical studies of the temperature dependence of the heat capacity are performed for mixtures of nanocomposites differing by the composition 68 at % Fe–32 at % M (M—Ge, Sn) and 95 at % Fe–5 at % C. It is shown that the introduction of sp-elements into nanocrystalline iron leads to substantial variations in the heat capacity over the whole temperature range under study. The heat capacity strongly depends on the introduced sp-element and degree of disorder of the formed material.     

Structure and Redox Properties of VCe0.95M0.05（M=Cu,Co,Mn,Fe and Cr）Mixed Oxides

Ｖａｎａｄｉｕｍｏｘｉｄｅｈａｓｂｅｅｎｗｉｄｅｌｙｓｔｕｄｉｅｄｉｎｔｈｅｒｅｃｅｎｔｙｅａｒｓｂｅｃａｕｓｅｏｆｉｔｓｉｍｐｏｒｔａｎｃｅｉｎｍａｎｙａｒｅａｓｏｆｃｈｅｍｉｓｔｒｙ .Ｉｎｔｈｅａｒｅａｏｆｃａｔａｌｙ ｓｉｓ ,ｖａｎａｄｉｕｍｏｘｉｄｅｈａｓｂｅｅｎｕｓｅｄａｓａｃａｔａ ｌｙｓｔｆｏｒｓｅｌｅｃｔｉｖｅｏｘｉｄａｔｉｏｎ ,ｏｘｉｄａｔｉｖｅｄｅｈｙｄｒｏ ｇｅｎａｔｉｏｎ ,ａｎｄａｍｍｏｘｉｄａｔｉｏｎｒｅａｃｔｉｏｎ[1～ 4] .Ｉｎｔｈｅｏｘｉｄａｔｉｏｎｒｅａｃｔｉｏｎｏｎ…     

Electrochemical properties of cobalt-free La0.80Mg0.20Ni2.85Al0.11M0.53 （M=Ni, Si, Cr, Cu, Fe） alloys

In order to investigate the effect of different B-site additions on phase structure and electrochemical properties of cobalt-free La-Mg-Ni based alloys, La0.80Mg0.20Ni2.85Al0.11M0.53 (M=Ni, Si, Cr, Cu, Fe) hydrogen storage alloys were prepared and studied systemati-cally. X-ray powder diffraction showed that the alloys consisted mainly of LaNi3 phase and LaNi5 phase except that Cr addition caused a minor Cr phase. Electrochemical testing indicated that alloys with additional Ni, Cr, Cu or Fe were activated within only 1-2 cycles, while that with Si addition needed 4 cycles. Adding Si, Cu and Fe increased cycling stability of La-Mg-Ni based alloys. However, maximum discharge capacity decreased from 362 mAh/g to 215 mAh/g in the order of Ni>Fe>Cu>Cr>Si. In addition, electrochemical kinetics of alloy electrodes was also researched by measuring high rate discharge ability (HRD), hydrogen diffusion coefficient (D) and limiting current density (IL).     

Mössbauer study of iron carbides: Cementite (Fe,M)3C (M = Cr,Mn) with various manganese and chromium contents

In many Mössbauer investigations on steel or iron based materials iron carbides play an important role. In Mössbauer phase analysis it is very helpful if the hyperfine parameters of different iron-carbides are known precisely. The results as revealed by investigation of pure cementite with various manganese and chronium contents are reported. The influence of chromium and manganese on the magnetic behaviour is presented. A preferred site occupation of chromium and manganese in the cementite was found.     

Investigations on hydrogen storage properties of LaMg8.52Ni2.23M0.15 （M=Ni, Cu, Cr） alloys

LaMg8.52Ni2.23M0.15 (M=Ni, Cu, Cr) alloys were prepared by induction melting. X-ray diffraction showed that all the three alloys had a multiphase structure, consisting of La2Mg17, LaMg2Ni and Mg2Ni phases. Energy dispersive X-ray spectrometer results revealed that most of Cu and Cr distributed in Mg2Ni phase. La2Mg17 and LaMg2Ni phases decomposed into MgH2, Mg2NiH4 and LaH3 phases during the hydrogenation process. Hydriding/dehydriding measurements indicated that the reversible hydrogen storage capacities of Mg2Ni phase in LaMg8.52Ni2.23M0.15 (M=Cu, Cr) alloys increased to 1.05 wt.% and 0.97 wt.% from 0.79 wt.% of Mg2Ni phase in LaMg8.52Ni2.38 alloy at 523 K. Partial substitution of Cu and Cr for Ni decreased the onset dehydrogenation temperature of the alloy hydrides and the temperature lowered by 18.20 and 5.50 K, respectively. The improvement in the dehydrogenation property of the alloys was attributed to that Cu and Cr decreased the stability of Mg2NiH4 phase.     

R(Fe,M)_(12)(R=Y,Nd,Sm,Gd,Tb,Dy,Ho,Er;M=Ti,V)金属间化合物结构及磁性的研究

本文用X射线、金相显微镜、扫描电镜、能谱、振动样品磁强计和磁称等方法,研究了R(Fe,M)_12(R为稀土元素,M为Ti,V)的晶体结构、微观组织和磁性。发现RFe_(10)Ti(除Nd外)的铸态合金不经长时间固溶就能形成ThMn_(12)型四方结构。确定出当Sm:Fe:Ti=1:10.5:1(原子比)时,Sm-Fe-Ti系铸态合金形成单相ThMn_(12)型四方结构。研究了Sm-Fe-Ti系合金粉末烧结体的微观组织及其成分。发现其微观组织中出现双晶界,双晶界的成分是富Fe的Fe-Ti化合物,经过适当的热处理工艺,可以消除这种双晶界。在Sm-Fe-Ti系合金的粉末烧结体中,存在着严重的稀土元素的偏聚,后续热处理工艺很难消除这种偏聚。     

Thermodynamic Assessment of DyCl3-MCl （M= Na, K, Rb, Cs） Systems

Using the CALPHAD （Calculation of Phase Diagram） technique, the DyCl3-MCl （M = Na, K, Rb, Cs） systems were optimized and calculated. The modified quasi-chemical model in the pair approximation for short-range ordering was used to describe the Gibbs energies of the liquid phase in these systems. From the measured phase diagram data and experimental thermodynamic properties, a series of thermodynamic functions were optimized base on an interactive computer-assisted analysis. The optimized parameters and the experimental data were thermodynamically self-consistent. The optimized results were discussed.     

Ti,N,Mg对M2高速钢凝固组织和硬度的影响

为了改善Ｍ２高速钢共晶碳化物的分布，本文利用小凝固试样变质的方法研究了Ｔｉ，Ｎ和Ｍｇ对Ｍ２高速钢凝固组织和硬度的影响。试验结果表明，加入Ｔｉ或Ｔｉ－Ｎ后，共晶碳化物形态和分布有很大改善，而加入Ｔｉ－Ｎ后对凝固组织有轻微的细化作用，但只添加Ｔｉ不补碳时，钢的淬火硬度和回火硬度均下降；加入适量的Ｍｇ可以使片状的Ｍ２Ｃ型共晶碳化物转为鱼骨状的Ｍ６Ｃ型共晶碳化物，使其分布有所改善，Ｔｉ和Ｍｇ复合加入可以明     

MTiO2（M=Mg,Ca,Sr,Ba）溶胶凝胶的合成和表征

在室温下用钛酸四丁酯的醇溶液和碱土金属硝酸盐Ｍ（ＮＯ３）２（Ｍ＝Ｍｇ，Ｃａ，Ｓｒ，Ｂａ）溶液的反应经过溶胶－凝胶法制备了多氧钛酸盐。在酸性条件下所获得的无定形凝胶在７００和９００℃温度之间煅烧制得了高纯ＭＴｉＯ２晶体粉末。用粉末Ｘ射线衍射（ＸＲＤ）、扫描电子显微镜（ＳＥＭ）和能量色散电子显微镜、热重（ＴＧ）、差热分析（ＤＴＡ）和ＢＥＴ表面积测量仪等研究了多种样品。Ｓｒ和Ｂａ的钛酸盐化合物稳定性好并     

Plasma Nitriding Behavior of Fe-C-M (M = Al, Cr, Mn, Si) Ternary Martensitic Steels

Change in surface hardness and nitrides precipitated in Fe-0.6C binary and Fe-0.6 mass pct C-1 mass pct M (M = Al, Cr, Mn, Si) ternary martensitic alloys during plasma nitriding were investigated. Surface hardness was hardly increased in the Fe-0.6C binary alloy and slightly increased in Fe-0.6C-1Mn and Fe-0.6C-1Si alloys. On the other hand, it was largely increased in Fe-0.6C-1Al and Fe-0.6C-1Cr alloys. In all the Fe-0.6C-1M alloys except for the Si-added alloy, fine platelet alloy nitrides precipitated inside martensite laths. In the Fe-0.6C-1Si alloy, Si-enriched film was observed mainly at a grain boundary and an interface between cementite and matrix. Crystal structure of nitrides observed in the martensitic alloys was similar to those in Fe-M binary ferritic alloys reported previously. However, there was a difference in hardening behavior between ferrite and martensite due to a high density of dislocations acting as a nucleation site of the nitrides and partitioning of an alloying element between martensite and cementite changing the driving force of precipitation of the nitrides.     

氧离子导体La2Mo1.9M0.1O9(M=V,Nb,Ta)的介电驰豫研究

用X射线衍射分析和介电驰豫测量研究了La2Mo2O9中VA族过渡金属元素的取代对晶格参数和氧离子扩散的影响,La2Mo2O9中用V,Nb和Ta取代Mo位(四面体配位)产生晶胞参数的变化反映了氧离子空位和离子半径的影响.在La2Mo1.9M0.1O9(M=V,Nb,Ta)样品中观察到相应的氧离子扩散介电损耗峰.通过计算得到V,Nb和Ta掺杂样品的氧扩散活化能分别为1.21eV,0.98eV和1.04eV.对晶格常数和单位晶胞自由体积的变化与氧离子短程扩散活化能之间的关系进行了讨论.     

Synthesis and Electrical Properties of La0.6M0.4FeO3-δ （M = Ca, Sr, Ba） as Cathodes for SOFCs

Intermediate-temperature solid oxide fuel cells(IT-SOFCs) have attracted extensively attentionin re-cent years because of the potential to dramatically re-duce the cost of the materials and cell fabrication inaddition to i mprove reliability , portability and long-termperformance stability ,it has been regarded as ahigh green energyin 21st[1].However ,the experi men-tal results identifiedthat the ohmic losses of IT-SOFCslargely occurred from cathode polarization , and theknown cathode mate…     

M84100／5M轧辊磨床改造

济钢对闲置的M84100／5M轧辊磨床的改造，既满足了宽厚板生产的需要，还节约了资金，同时也为轧辊磨床的改造积累了经验。     

(Ti,M)C复式碳化物制备方法的研究进展

对当前(Ti,M)C碳化物的制备方法进行了综述,详细介绍了不同制备方法的制备过程及原理,对不同制备方法的优缺点进行了论述。碳热还原法是目前广泛使用的一种方法,能够制备复杂成分的(Ti,M)C,但该方法耗能大、工艺流程复杂;预合金化法能够制备某些特定成分的碳化物,但其使用范围受限;自蔓延高温合成法可以制备多种成分的(Ti,M)C,但大部分情况下需要预热且存在反应不完全的情况。目前没有一种制备方法同时具有高效、工艺流程简单、适用性强且产物纯度高等优点,对现有制备方法进行改进以满足工业化应用是(Ti,M)C复式碳化物的研究发展方向。