Influence of Rare Earth on Carbide in Weld Metal

Inhardsteelwelds ,thehighcarboncontentisnecessaryandlotsofcarbidesareexpectedtoforminordertoincreasethehardnessandwearresistanceofmaterial.Buttheweldshave poorstrengthandtoughnessowingtotheformationofhighcarbonmartensiteandnetworkcarbides .Ifthecarbidesareturnedinto granularformanddistributedevenly ,thetoughnessofweldmetalcouldbemarkedlyin creased .Forthispurpose ,thehighcarbonNb Ti V Zr REalloysystemwasdesigned .Niobium ,titani um ,vanadiumandzirconiumcouldcombinewithcarbontoformlotsofcarb…     

Lubricity of Rare Earth Compounds in Oil

Ｉｎｒｅｃｅｎｔｙｅａｒｓ，ｔｈｅａｐｐｌｉｃａｔｉｏｎｏｆｒａｒｅｅａｒｔｈｃｏｍｐｏｕｎｄｓｉｎｔｈｅｔｒｉｂｏｌｏｇｉｃａｌｆｉｅｌｄｈａｓｂｅｃｏｍｅｏｎｅｏｆｔｈｅｍｏｓｔｉｎｔｅｒｅｓｔｉｎｇｒｅｓｅａｒｃｈｔｏｐｉｃｓｆｏｒｔｒｉｂｏｌ...     

Influence of Rare Earth on Property of Low Chromium Semi-Steel

Itisnoticeablethatthelowchromiumsemi steelhashighhardnessandabrasionresistance[1] .However,thematerialhaslowductility ,owingtothereticulatedistributionofcarbide ,whichrestrictsitsapplications .Therefore ,itisnecessarytoim provethecomprehensivepropertiesforpotentialap plications .Thecomprehensive propertiesoflowchromiumsemi steelcanbeimprovedbyaddingrareearths (RE)becauseREcanchangethemorphologyofcarbideandnon metallicinclusions ,refinegrainsize,purifyandstrengthen grainboundaryandsoon[2 -5] …     

Influence of Rare Earth Elements on Microstructure and Mechanical Properties of Mg-Li Alloys

Mg-Li alloy , which is also called superlight al-loy ,has many advantages ,such as lowdensity ,highstiffness-to-weight ratio , superior strength-to-weightratio ,good deformation ability ,good damping ability ,and high energetic particle penetration resistance[1 ,2].These advantages provide promising applicationsintheaerospace , electronic industry , and military field[3].Mg-Li alloys ,such as LA141 , LA191 ,and LAZ933were developed and have been usedfor components insatellites and aircrafts…     

Influence of Rare Earth Elements on Microbial Biomass Carbon in Red Soils

Ｒｅｄｓｏｉｌｓａｍｐｌｅ（ｕｌｔｉｓｏｌ）ｆｒｏｍｏｒａｎｇｅｏｒｃｈａｒｄｉｎＬｏｎｇｙｏｕＣｏｕｎｔｙ，ＺｈｅｊｉａｎｇＰｒｏｖｉｎｃｅｗａｓｓｅｌｅｃｔｅｄｆｏｒｔｈｅｓｔｕｄｙ．Ｔｈｅｓｏｉｌｈａｓｔｈｅｆｏｌｌｏｗｉｎｇｐｒｏｐｅｒｔｉｅｓ：ｐＨＨ２Ｏ５－１，ｏｒｇａｎｉｃｍａｔｔｅｒｃｏｎｔｅｎｔ２－３５％，ｃａｔｉｏｎｅｘｃｈａｎｇｅｃａｐａｃｉｔｙ１０－５０ｍｍｏｌｐｅｒ１００ｇｓｏｉｌｓ，ａｎｄｓｏｌｕａｂｌｅＲＥＥｃｏｎｔｅｎｔｓ１１－４４ｍｇ·ｋｇ－１ｓｏｉｌｓ．Ａｆ…     

Effect of La~(3+)on Activities of Antioxidant Enzymes in Wheat Seedlings under Mercury Stress

Ｓｉｎｃｅ 1 970ｓ ,ＲＥＥｓ (ｒａｒｅｅａｒｔｈｅｌｅｍｅｎｔｓ)ｆｅｒｔｉｌｉｚｅｒｈａｓｂｅｅｎｅｘｔｅｎｓｉｖｅｌｙｒｅｓｅａｒｃｈｅｄｏｎａｐｐｌｉｃａｔｉｏｎｉｎａｇｒｉｃｕｌｔｕｒｅａｎｄｔｈｅｉｒｐｈｙｓｉｏｌｏｇｉ ｃａｌｅｆｆｅｃｔｓ .Ｔｈｅｒｅｗｅｒｅｍａｎｙｅｘｐｅｒｉｍｅｎｔａｌｄａ ｔａ .ＳｏｍｅｒｅｓｅａｒｃｈｅｒｓｒｅｐｏｒｔｅｄｔｈａｔＲＥＥｓｃａｎｎｏｔｏｎｌｙｐｒｏｍｏｔｅｐｌａｎｔｇｒｏｗｔｈ ,ｂｕｔａｌｓｏｅｎ ｈａｎｃｅｔｈｅｓｔｒｅｓｓｔｏｌｅｒａｎｃｅ .…     

Effect of Long-term Intake of Rare Earth in Drinking Water on Trace Elements in Brains of Mice

Ｔｈｅｉｍｐａｃｔｏｆｒａｒｅｅａｒｔｈｓｏｎｅｎｖｉｒｏｎｍｅｎｔ,ｈｅａｌｔｈａｎｄｅｃｏｓｙｓｔｅｍ ,ａｎｄｉｔｓｌｏｎｇ ｔｅｒｍｂｉｏ ｌｏｇｉｃａｌｅｆｆｅｃｔｓｈａｖｅｄｒａｗｎｐｅｏｐｌｅ′ｓｍｕｃｈａｔｔｅｎ ｔｉｏｎ ,ｍａｎｙｗｏｒｋｓｈａｖｅｂｅｅｎｄｏｎｅ ,ｂｕｔｌｉｔｔｌｅｈａｓｋｎｏｗｎａｂｏｕｔｔｈｅｅｆｆｅｃｔｏｆｒａｒｅｅａｒｔｈｏｎｔｒａｃｅｅｌｅｍｅｎｔｓ[1 ] .Ｔｒａｃｅｅｌｅｍｅｎｔｓｐｌａｙａｎｉｍ ｐｏｒｔａｎｔｒｏｌｅｉｎｄｅｖｅｌｏｐｍｅｎｔ ,ｍｅｔａ…     

Study on Simultaneous Catalytic Reduction of Sulfur Dioxide and Nitric Oxide on Rare Earth Mixed Compounds

CeO2/γ-Al2O3, La2O3/γ-Al2O3, CeO2-La2O3/γ-Al2O3 and CeO2-La2O3, which were prepared by impregnating in certain ratio, were used as the catalysts for the reduction of SO2 and NO by CO. Separate and simultaneous removal of SO2 and NO over La2O3/γ-Al2O3, CeO2/γ-Al2O3, CeO2-La2O3/γ-Al2O3 were investigated. The phase characteristics of catalysts were also analyzed by X-ray diffraction. The result shows that the conversions of SO2 and NO are above 98% over CeO2/γ-Al2O3 and CeO2-La2O3/γ-Al2O3. After SO2 is added in the NO-CO-N2 system (NO∶SO2=1∶2～1∶3), the conversions of SO2 and NO are both above 98%. Furthermore, it is found that CeO2-La2O3 with various ratios has different activity for the simultaneous reduction of SO2 and NO.     

Studies on the Fractionation and Availability of Added Soluble Rare Earth Elements in Soil

ＳｔｕｄｉｅｓｏｎｔｈｅＦｒａｃｔｉｏｎａｔｉｏｎａｎｄＡｖａｉｌａｂｉｌｉｔｙｏｆＡｄｄｅｄＳｏｌｕｂｌｅＲａｒｅＥａｒｔｈＥｌｅｍｅｎｔｓｉｎＳｏｉｌＣｈｅｎＺｈａｏｘｉ（ＥａｓｔＣｈｉｎａＩｎｓｔｉｔｕｔｅｏｆＭｅｔａｌｌｕｒｇｙ，Ｍａａｎｓｈ...     

Influence of Rare Earth Elements on Microstructure and Mechanical Properties of Cast High-Speed Steel Rolls

The influence of rare earth （RE） elements on the solidification process and eutectic transformation and mechanical properties of the high-V type cast, high-speed steel roll was studied. Test materials with different RE additions were prepared on a horizontal centrifugal casting machine. The solidification process, eutectic structure transformation, carbide morphology, and the elements present, were all investigated by means of differential scanning calorimetry （DSC） and scanning electron microscopy energy dispersive spectrometry （SEM-EDS）. The energy produced by crack initiation and crack extension was analyzed using a digital impact test machine. It was found that rare earth elements increased the tensile strength of the steel by inducing crystallization of earlier eutectic γ-Fe during the solidification process, which in turn increased the solidification temperature and thinned the dendritic grains. Rare earth elements with large atomic radius changed the lattice parameters of the MC carbide by forming rare earth carbides. This had the effect of dispersing longpole M C carbides to provide carbide grains, thereby, reducing the formation of the gross carbide and making more V available, to increase the secondary hardening process and improve the hardness level. The presence of rare earth elements in the steel raised the impact toughness by changing the mechanism of MC carbide formation, thereby increasing the crack initiation energy.     

Study of the Coarse Blocky Compounds in the As－cast 7075 Aluminium Alloys Containing Rare Earth Elements

ＳｔｕｄｙｏｆｔｈｅＣｏａｒｓｅＢｌｏｃｋｙＣｏｍｐｏｕｎｄｓｉｎｔｈｅＡｓ－ｃａｓｔ７０７５ＡｌｕｍｉｎｉｕｍＡｌｌｏｙｓＣｏｎｔａｉｎｉｎｇＲａｒｅＥａｒｔｈＥｌｅｍｅｎｔｓＰａｎＦｕｓｈｅｎｇ；ＺｈｏｕＳｈｏｕｚｅ；ＤｉｎｇＰｅｉｄａｏ；（Ｃｈ...     

Study on the Formation of Crystalline Rare Earth Carbonates from Rare Earth Ore Leaching Liquors

The crystalline precipitate of rare earth carbonates has been produced by the ammonium bicar-bonate precipitation method in the recovery of RE from the ammonium sulfate leaching liquor of the weath-ered leach-deposited rare earth ore.Various influencing factors such as time,temperature and reagent con-centration have been studied.And chemical analysis,XRD,SEM,IR spectrography,TGA and DTA havebeen used to analyze and examine the crystalline RE carbonates.Good results were obtained.     

黑色风化物的物理化学性质及稀土配分研究

某稀土矿产生的黑色风化物，是一种稀土以胶态相赋存的新稀土资源。黑色风化物主要由锰、铁，稀土和铅组成，形成锰铁氧化物非晶质的高聚合度无机高分子。黑色风化物强烈地选择铈族轻稀土，与矿区产的矿石和氟碳铈矿稀土配分相近，但黑色风化物含中重稀土最高，矿石次之，氟碳铈矿最低。     

Report on Rare Earth Market Evolution and Involvement of Rhone－Poulenc in the Market

ＲｅｐｏｒｔｏｎＲａｒｅＥａｒｔｈＭａｒｋｅｔＥｖｏｌｕｔｉｏｎａｎｄＩｎｖｏｌｖｅｍｅｎｔｏｆＲｈｏｎｅ－ＰｏｕｌｅｎｃｉｎｔｈｅＭａｒｋｅｔＭａｔｔｈｅｗｓＪＤ；ＶａｎｄｅｒｓｔｒｉｃｈｔＪＰ（Ｒｈｏｎｅ－ＰｏｕｌｅｎｃＲａｒｅＥａｒｔｈｓａｎｄ...     

铈对花生幼苗抗氧化酶活性影响的研究

采用花生(A rach is hypogaca l)幼苗为材料,通过叶面喷施C eC l3溶液,研究铈对花生生长初期超氧化物歧化酶及相关生理指标的影响。结果表明,20μg/L~80μg/L铈使叶片的超氧化物歧化酶(SOD)活性升高,100μg/L和200μg/L的铈使SOD活性下降,后者较前者更加显著;铈对过氧化物酶(POD)活性和叶片可溶性蛋白含量的影响较SOD而言相对平缓,但趋势相同。证实,铈对SOD的促进作用主要表现在锰型SOD上,体外实验表明M n-SOD酶蛋白能与C e3+结合。     

离子吸附型稀土矿的除铝研究

在我国南方离子吸附型稀土生产过程中,铝的含量不仅影响稀土氧化物产品的质量,而且还增加原材料的消耗。本文探索了一套南方稀土矿生产中降低铝含量的方法,并分析对比了应用该工艺前后的结果,试验取得了满意的效果。     

Study on Laser Drilling in Rare Earth Magnets

ＳｔｕｄｙｏｎＬａｓｅｒＤｒｉｌｉｎｇｉｎＲａｒｅＥａｒｔｈＭａｇｎｅｔｓＬｉｕＬｉｍｉｎ（刘丽敏），ＬｉＣｈａｎｇｊｉａｎｇ（李长江）（ＢｅｉｊｉｎｇＵｎｉｖｅｒｓｉｔｙｏｆＣｈｅｍｉｃａｌＴｅｃｈｎｏｌｏｇｙ，Ｂｅｉｊｉｎｇ１０００２９，Ｃｈｉｎ...     

Prediction of Heat of Fusion of Rare Earth Compounds from Binary Phase Diagrams

Based on the thermodynamical principle the new formula for calculation of heat of fusion and its error havebeen derived from binary phase diagrams which could be classified to eutectic,solid solution,degenerate eutecticand involving a compound phase diagram and so on.Using these formulae heats of fusion of some rare earth ox-ides have been predicted.     

稀土在钢中的应用

本文阐述稀土在钢中的作用机理和加入方法,分析了稀土应用的前景。对钢液进行稀土处理是我国发展钢产业的重要技术手段之一。