MECHANICAL PROPERTIES AND MICROSTRUCTURES OF Ti(C,N) BASED CERMETS

ＭＥＣＨＡＮＩＣＡＬＰＲＯＰＥＲＴＩＥＳＡＮＤＭＩＣＲＯＳＴＲＵＣＴＵＲＥＳＯＦＴｉ（Ｃ，Ｎ）ＢＡＳＥＤＣＥＲＭＥＴＳ￥ＬｉｕＮｉｎｇ（ＤｅｐａｒｔｍｅｎｔｏｆＭａｔｅｒｉａｌｓＳｃｉｅｎｃｅａｎｄＥｎｇｉｎｅｅｒｉｎｇ，ＡｎｈｕｉＩｎｓｔｉｌｕｔｅ...     

MICROSTRUCTURE AND MECHANICAL PROPERTIES OF Fe_3Al BASED ALLOYS

ＭＩＣＲＯＳＴＲＵＣＴＵＲＥＡＮＤＭＥＣＨＡＮＩＣＡＬＰＲＯＰＥＲＴＩＥＳＯＦＦｅ_３ＡｌＢＡＳＥＤＡＬＬＯＹＳＤ．Ｇ．ＭＯＲＲＩＳ（ＩｎｓｔｉｔｕｔｅｏｆＳｔｒｕｃｔｕｒａｌＭｅｔａｌｌｕｒｇｙ，ＡｖｅｎｕｅｄｅＢｅｌｌｅｖａｕｘ５１，Ｕｎｉｖｅｒ?..     

IMPROVEMENT IN ELECTROCHEMICAL PERFORMANCES OF Mm(NiCoMnAl)_5 ELECTRODES BY SURFACE MODIFICATION

ＩＭＰＲＯＶＥＭＥＮＴＩＮＥＬＥＣＴＲＯＣＨＥＭＩＣＡＬＰＥＲＦＯＲＭＡＮＣＥＳＯＦＭｍ（ＮｉＣｏＭｎＡｌ）５ＥＬＥＣＴＲＯＤＥＳＢＹＳＵＲＦＡＣＥＭＯＤＩＦＩＣＡＴＩＯＮ①ＣｈｅｎＷｅｉｘｉａｎｇＤｅｐａｒｔｍｅｎｔｏｆＭａｔｅｒｉａｌｓＳｃｉｅｎ...     

INTERFACE DEFORMATION CHARACTERISTICS OF BIMETAL FORMING

ＩＮＴＥＲＦＡＣＥＤＥＦＯＲＭＡＴＩＯＮＣＨＡＲＡＣＴＥＲＩＳＴＩＣＳＯＦＢＩＭＥＴＡＬＦＯＲＭＩＮＧ①ＰｅｎｇＹｉｎｇｈｏｎｇａｎｄＲｕａｎＸｕｅｙｕＮａｔｉｏｎａｌＤｉｅ＆ＭｏｌｄＣＡＤＥｎｇｉｎｅｒｉｎｇＲｅｓｅａｒｃｈＣｅｎｔｅｒ，Ｓｈａｎｇ...     

STATISTICAL MECHANICS MODEL OF LIQUID BINARY ALLOY AND ITS PARAMETERS

ＳＴＡＴＩＳＴＩＣＡＬＭＥＣＨＡＮＩＣＳＭＯＤＥＬＯＦＬＩＱＵＩＤＢＩＮＡＲＹＡＬＬＯＹＡＮＤＩＴＳＰＡＲＡＭＥＴＥＲＳ①ＦａｎＣｈｅｎｇｃａｉ，ＷａｎｇＪｉａｎ，ＬｉＷｅｎｃｈａｏ，ＱｉａｎＪｉａｘｕＵｎｉｖｅｒｓｉｔｙｏｆＳｃｉｅｎｃｅａｎｄＴｅ...     

MICROWAVE-ASSISTED CARBOTHERMIC REDUCTION OF ILMENITE

ＭＩＣＲＯＷＡＶＥ－ＡＳＳＩＳＴＥＤＣＡＲＢＯＴＨＥＲＭＩＣＲＥＤＵＣＴＩＯＮＯＦＩＬＭＥＮＩＴＥＨＵＡＹｉｘｉｎａｎｄＬＩＵＣｈｕｎｐｅｎｇ（ＤｅｐａｒｔｍｅｎｔｏｆＭｅｔａｌｌｕｒｇｙ,ＫｕｎｍｉｎｇＵｎｉｖｅｒｓｉｔｙｏｆＳｃｉｅｎｃｅａｎｄＴ...     

MICROSTRUCTURE，INTERFACE AND MECHANICAL PROPERTIES OF NiAl－BASED COMPOSITES REINFORCED BY TiB_2 PARTICULATES

ＭＩＣＲＯＳＴＲＵＣＴＵＲＥ，ＩＮＴＥＲＦＡＣＥＡＮＤＭＥＣＨＡＮＩＣＡＬＰＲＯＰＥＲＴＩＥＳＯＦＮｉＡｌ－ＢＡＳＥＤＣＯＭＰＯＳＩＴＥＳＲＥＩＮＦＯＲＣＥＤＢＹＴｉＢ_２ＰＡＲＴＩＣＵＬＡＴＥＳＧＵＯＪｉａｎｔｉｎｇ（ＩｎｓｔｉｔｕｔｅｏｆＭｅｔａ?..     

MICROSTRUCTURE AND MECHANICAL PROPERTIES OF RAPIDLY SOLIDIFIED Al－Fe BASED ALLOYS

ＭＩＣＲＯＳＴＲＵＣＴＵＲＥＡＮＤＭＥＣＨＡＮＩＣＡＬＰＲＯＰＥＲＴＩＥＳＯＦＲＡＰＩＤＬＹＳＯＬＩＤＩＦＩＥＤＡｌ－ＦｅＢＡＳＥＤＡＬＬＯＹＳＷ．Ｊ．Ｐａｒｋ；Ｓ．Ａｈｎ；Ｒ．Ｓｃｈｍｅｅｓ；ａｎｄＮａｃｋＪ．Ｋｉｍ（１）（ＣｅｎｔｅｒｆｏｒＡｄｖ...     

ASSESSMENT OF THERMODYNAMIC DATA AND STABILITY OF INTERMETALLIC COMPOUNDS

ＡＳＳＥＳＳＭＥＮＴＯＦＴＨＥＲＭＯＤＹＮＡＭＩＣＤＡＴＡＡＮＤＳＴＡＢＩＬＩＴＹＯＦＩＮＴＥＲＭＥＴＡＬＬＩＣＣＯＭＰＯＵＮＤＳ￥ＬＩＷｅｎｃｈａｏ;ＬＩＸｉｎｇｋａｎｇ;ＷＡＮＧＪｉａｎ;ＺＨＯＵＧｕｏｚｈｉ（ＵｎｉｖｅｒｓｉｔｙｏｆＳｃｉｅｎｃ...     

RELATIONS BETWEEN INTERFACE OF CF/Al-4.5 Cu COMPOSITE AND SOLIDIFICATION PROCESSING

ＲＥＬＡＴＩＯＮＳＢＥＴＷＥＥＮＩＮＴＥＲＦＡＣＥＯＦＣＦ／Ａｌ４．５ＣｕＣＯＭＰＯＳＩＴＥＡＮＤＳＯＬＩＤＩＦＩＣＡＴＩＯＮＰＲＯＣＥＳＳＩＮＧ①ＣｈｕＳｈｕａｎｇｊｉｅ，ＷｕＲｅｎｊｉｅＲｅｓｅａｒｃｈＩｎｓｔｉｔｕｔｅｏｆＣｏｍｐｏｓｉｔｅＭ...     

Al_2O_3-TiC复合陶瓷的冷压烧结

研究了Al2O3－TiC复合陶瓷的冷压烧结。实验结果表明：通过添加少量的烧结助剂,Al2O3＋TiC冷压烧结能制造出致密的复合陶瓷,制品性能与热压制品性能相当。氢气流量及烧结填料是冷压烧结的工艺关键。     

利用Al氧化反应修复陶瓷宏观裂纹

基于金属Al在高温下氧化形成氧化铝并伴随体积膨胀的效应，利用该体积膨胀抵消烧结致密化导致的体积收缩，设计了Al、Al2O3为主要组成、少量的Y2O3和SiO2为烧结助剂的填充相组分，以95氧化铝方形小坩埚模拟陶瓷宏观裂纹，进行了陶瓷宏观裂纹的修复研究。通过比较Al含量、烧成温度和升温制度对填充组分膨胀量和修复界面微观结构的影响，证实氧化物陶瓷宏观裂纹可通过选择适宜的Al／Al2O，填充组分实现修复。     

Fabrication of finegrained Al2O3 ceramic at low sintering temperature

A research on fabrication of finegrained Al2O3 ceramic at lower sintering temperature was carried out.Al2O3 powder with 50 nm in diameter is compounded with 11.24%Al and 4.75% Fe(mass fraction) by high-energy ball-milling. AI is got from Al powder which is a component of the materials being milled and Fe from steel milling balls and milling jar during the milling. In this way, nearly no impurity is brought into the composite powder during milling. With hot pressing of the composite powder and pure Al2O3 powder, it is proved that Al2O3 powder can be densified at lower sintering temperature when the powder is compounded in this way. Al2OC and AlFe form during sintering process of the composite powder. With the reactive sintering and multiphase sintering mechanisms, finegrained Al2O3 ceramic is fabricated at low sintering temperature.     

TiB_2和SiC_w对Al_2O_3陶瓷材料力学性能及微观结构的影响

以TiB2颗粒和SiC晶须对Al2O3陶瓷进行增韧补强,采用热压法同时了制备了Al2O3,Al2O3／TiB2和Al2O3／TiB2／SiCw三种陶瓷材料,研究了TiB2颗粒和SiC晶须对Al2O3陶瓷材料的力学性能和微观结构的影响。结果表明;因TiB2的加入可明显改善Al2O3。陶瓷材料的强度、硬度和韧性;而TiB2颗粒和SiC晶项协同对Al2O3进行增韧补强可使其断裂韧性显著提高。Al2O3／TiB2陶瓷材料的主要增韧机理有;TiB2粒子的针扎作用和使裂纹产生偏转;而Al2O3／TiB2／SiCw陶瓷材料的主要增韧机理有：晶须拔出、裂纹桥接和裂纹偏转。     

Al_2O_3/TiC/Mo/Ni陶瓷拉拔模具内孔表面磨损行为

采用热压烧结技术研制出Al_2O_3/TiC/Mo/Ni陶瓷拉拔模具.在MRH-3高速环-块磨损试验机上研究了不同载荷与滑动速度下Al_2O_3/TiC/Mo/Ni陶瓷拉拔模具材料与45#钢对摩时的干摩擦磨损性能,并对其磨损率进行了分析.采用有限元法分析了Al_2O_3/TiC/Mo/Ni陶瓷拉拔模具在加工过程中的受力分布,研究了其内孔在实际拉拔加工中的磨损行为及磨损机理.结果表明:Al_2O_3/TiC/Mo/Ni陶瓷拉拔模具具有较好的强度和硬度,在高速下的耐磨性较好,磨损率较低,保持在3.1×10~(-9) cm~3/(N·m);其内孔磨损在工作区及定径区最为严重,主要以磨料磨损为主,出口区有轻微压裂.     

用高岭土合成Sialon粉末的无压烧结

概述了Ｓｉａｌｏｎ陶瓷材料制备方面的研究。以高岭土为主要原料,采用碳热还原氮化法合成的Ｓｉａｌｏｎ粉末为主要原料,分别添加Ｙ２Ｏ３Ａｌ２Ｏ３系与Ａｌ２Ｏ３ＭｇＯ系两种烧结助剂后进行充分混合,混合物粉末在钢模中冷压成两种压坯试样ａ和ｂ,然后在Ｎ２气氛中进行无压烧结。对烧成温度与烧结体体积密度的关系,烧结助剂的作用以及Ｓｉａｌｏｎ粉末无压烧结致密化过程进行了重点讨论。实验结果表明,分别添加１０％Ｙ２Ｏ３５％Ａｌ２Ｏ３和１０％Ａｌ２Ｏ３５％ＭｇＯ（均为质量分数,％）两种烧结助剂的试样ａ和ｂ分别在１６２０℃和１５９０℃烧成温度下,获得了致密的Ｓｉａｌｏｎ陶瓷材料。并且建立了Ｓｉａｌｏｎ粉末无压烧结致密化模型,即ｌｇ（ΔＶ／Ｖ０）∝ｌｇｔ,其致密化过程分为颗粒重排与溶解析出两个阶段,且扩散为全过程的控制性步骤。     

Microstructure of Al_2O_3/SiO_2 ceramic core nano-composites

1　INTRODUCTIONThedevelopmentofnewgenerationofhighper formanceaeroengineneedstoimprovethecombustiblegastemperaturegreatly[15] ,andtheadoptionofhol lowgascoolingbladeisanimportantmethod[6 8] .Butthekeyofproducinggascoolingbladewithhighcoolingefficiencyisthepreparationofceramiccorewithhighproperties .Withtheincreaseofthecoolingefficiencyofthegasblade ,thepropertydemandoftheceramiccoresbecomeshigherstepbystep .The propertiesoftheceramiccorearedeter minedbyitsmaterials.Ceramiccoresmainlyinclu…     

Al2O3—TiC—Co改性陶瓷的性能及其耐磨性

以化学沉积的方法,在陶瓷体Ａｌ２Ｏ３,ＴｉＣ的表面均匀包覆一层Ｃｏ膜。混合球磨后经热压烧结的Ａｌ２Ｏ３－Ｔｉｃ－Ｃｏ（ＡＴＣ）改性陶瓷的强度和断裂韧性比Ａｌ２Ｏ３－ＴｉＣ提高约４０％。并对Ａｌ２Ｏ－ＴｉＣ－Ｃｏ和Ａｌ２Ｏ３－ＴｉＣ陶瓷的磨粒磨损行为、磨损机理和磨粒磨损耐磨性进行了比较。结果表明,Ａｌ２Ｏ３－ＴｉＣ－Ｃｏ陶瓷的耐磨性明显好于Ａｌ２Ｏ３－ＴｉＣ陶瓷,磨损表面呈现较多的塑性变形。     

Al2O3粉末对镁合金微弧氧化陶瓷膜的显微结构及其耐蚀性的影响

在已优化的Na2SiO4-Na3PO4复合体系溶液中加入Al2O3粉末对AZ91D镁合金进行了微弧氧化处理。用SEM、XRD分析了加入Al2O3粉末对陶瓷膜的形貌特征和相成分的影响。结果表明，加入Al2O3粉末后陶瓷膜孔洞减少，且疏松层变得紧实；膜层相成分增加了Al2O3。在3．5％NaCl溶液中的电化学腐蚀试验表明，加入Al2O3粉末后陶瓷膜的耐蚀性有很大提高。     

一种解决陶瓷型芯开裂的方法

介绍一种解决复杂陶瓷型芯开裂的工艺方法,对于结构复杂、厚薄悬殊、存在细长形状的陶瓷型芯,在压制成型和烧结过程中极易出现开裂,运用常规的裂纹解决方法效果不明显.通过在陶瓷型芯预埋芯骨的方法,能显著提高陶瓷型芯的压制和烧结合格率,进而提高熔模精密铸件的合格率.