CaO—SiO2—Al2O—MgO—TiO2—V2O5渣系熔融还原过程中钛对钒还原影响的研究

在实验室条件下，模拟铁浴法熔融还原过程，探讨了在ＣａＯ－ＳｉＯ２－Ａｌ２Ｏ３－ＭｇＯ－ＴｉＯ２－Ｖ２Ｏ５渣系与碳饱和熔铁之间Ｖ－Ｔｉ的耦全反应，以及在不同条件下钛对钒还原的影响。     

CaO—SiO2—Al2O3—MgO—TiO2渣系熔副还原过程中钛还原行为的研究

在实验室条件下，探讨了铁浴法熔融还原过程中，在ＣａＯ－ＳｉＯ２－Ａｌ２Ｏ３－ＭｇＯ－ＴｉＯ２渣系与碳饱和熔铁间钛的还原行为，以及渣中ＴｉＯ２含量，熔渣碱度（ＣａＯ／ＳｉＯ２），还原温度，铁浴量等因素对钛还原的影响。     

碳饱和铁液与CaO—SiO2—TiO2系熔渣间TiO2的还原

实验研究了碳饱和铁液与ＣａＯ－ＳｉＯ２－ＴｉＯ２（％ＴｉＯ２）＜１８）系熔渣间（ＴｉＯ２）的还原速度，同时考察了初渣碱度，温度对（ＴｉＯ２）还原速度的影响，研究结果表明：在本实验体系中，在初渣碱度Ｂ＝（％ＣａＯ）／（％ＳｉＯ２）＝０．５４－１．５范围内，随着碱度的升高，（ＴｉＯ２）的还原速度加快，而温度的提高也能加快（ＴｉＯ２）的还原速度。建立了在该实验体系中（ＴｉＯ２）被铁液中的溶解碳还原的速度     

Cu—C—Ti系和Cu—CuO—Al系合金粉末的机构合金化

将Ｃｕ－Ｃ３．３％－Ｔｉ１３．３％和Ｃｕ－ＣｕＯ２．５％－Ａｌ１．１％二合金粉末分别进行机械合金化，结果发现，经２０ｈ球磨后，Ｃ的衍射峰已经消失，Ｔｉ，Ａｌ，ＣｕＯ的衍射峰强度显著降低；６０ｈ球磨后，二合金粉末都形成了Ｃｕ基过饱和固溶体；１００ｈ球磨后，部分Ｔｉ，Ｃ，Ａｌ，Ｏ溶质元素脱溶析出，并反应生成ＴｉＣ和Ａｌ２Ｏ３。     

CaO－Sio_2－Al_2O_3－MgO－TiO_2－V_2O_5渣系熔融还

在实验室条件下，模拟铁浴法熔融还原过程，探讨了在ＣａＯ－ＳｉＯ＿２－Ａｌ＿２Ｏ＿３－ＭｇＯ－ＴｉＯ＿２－Ｖ＿２Ｏ＿５渣系与碳饱和熔铁之间Ｖ－Ｔｉ的耦合反应，以及在不同条件下钛对钒还原的影响。     

添加剂对Cr2O3—Al系SHS反应的影响

研究了添加ＣｒＯ３－Ａｌ、Ｆｅ２Ｏ３－Ａｌ＋ＭｇＯ及Ｔｉ－Ｃ的Ｃｒ２Ｏ３－Ａｌ系的燃烧特性。实验发现，添加ＣｒＯ３－Ａｌ、Ｆｅ２Ｏ３－Ａｌ＋ＭｇＯ时，自蔓燃反应易于引发；体系中混入Ｔｉ－Ｃ添加剂对反应引发不利，但在用纯Ｔｉ－Ｃ作引火剂情况下可以引发。随着ＣｒＯ３－Ａｌ添加量的增加，燃烧温度升高，但添加量大于２０％时，燃烧温度反而下降。燃烧温度随Ｆｅ２Ｏ３－Ａｌ＋ＭｇＯ添加量的增加而升高。Ｔｉ－Ｃ添加量的增大对燃烧温度影响不大。燃烧速度随以上添加剂量的增大而增大     

Ru（bpy）2（NCS）2染料敏化PbS／Zn^2＋—TiO2复合半导体纳米多孔膜电极 …

采用水热法合成了Ｚｎ＾２＋离子掺杂的ＴｉＯ２纳米粒子（掺杂量０．５），并用光电化学方法研究了Ｒｕ（ｂｐｙ）２（ｂｐｙ＝２，２’－ｂｉｐｙｄｉｎｅ－４，４’－ｄｉｃａｒｂｏｘｙｌｉｃ ａｃｉｄ）分别敏化Ｚｎ＾２＋掺杂的ＴｉＯ２电极和ＰｂＳ／Ｚｎ＾２＋－ＴｉＯ２复合半导体纳米多孔膜电极的光电化学行为。实验证明Ｒｕ（ｂｐｙ）２（ＮＣＳ）２敏化ＰｂＳ／Ｚｎ＾２＋－ＴｉＯ２复合半导体纳米多孔膜电极比单独敏化     

CaO－SiO_2－Al_2O_3－MgO－TiO_2渣系熔融还原过程中钛还原

在实验室条下，探讨了铁浴法熔融还原过程中，在ＣａＯ－ＳｉＯ＿２－Ａｌ＿２Ｏ＿３－ＭｇＯ－ＴｉＯ＿２渣系与碳饱和熔铁间钛的还原行为，以及渣中ＴｉＯ＿２含量、熔渣碱度（ＣａＯ／ＳｉＯ＿２）、还原温度、铁浴量等因素对钛还原的影响。     

等离子体加热脱SiO2制取ZrO2的C—N—O图

在１５０ｋＷ等离子体装置中，制取脱硅锆（ＺｒＯ２８８．６０％～９６．９０％）和稳定型氧化锆（ＺｒＯ２９１．５４％，ＭｇＯ５．３９％）探讨了温度，时间和配碳量等对脱ＳｉＯ２率的影响，建立了Ｓｉ－Ｃ－Ｎ－Ｏ系和Ｚｒ－Ｃ－Ｎ－Ｏ系相平衡图，从理论上说明不具备生成Ｓｉ３Ｎ４的热力学条件，而在等离子体炉内的小区域具备生成ＺｒＣ和ＺｒＮ的条件，这些结论得到实验验证。     

Na2O—CrO3—Al2O3—H2O四元水盐体系高碱区相图

在２５℃和８０℃温度下研究了Ｎａ２Ｏ浓度大于４１０ｇ／Ｌ时的Ｎａ２Ｏ－ＣｒＯ３－Ａｌ２Ｏ３－Ｈ２Ｏ四元体系高碱区相图，发现在高碱区范围内，Ｎａ２Ｏ，ＣｒＯ３和Ａｌ２Ｏ３没有复盐生成，且液相线的位置随温度的变化较大。     

C—SjC—TiC—TiB_2复合材料的原位合成及热压烧结

以熟焦、炭纤维、B_4C、SiC、Si、TiO_2和TiC为原料、采用原位合成及热压技术研究了不同TiO_2和TiC含量对多组分碳/陶复合材料的组成、结构和性能的影响。在烧结过程中TiO_2或TiC与B_4C反应原位生成TiB_2,Si和TiO_2分别与C反应生成SiC和TiC,这些陶瓷相的生成对提高碳/陶复合材料的力学性能有显著作用。加入TiO_2比TiC能使碳/陶复合材料在较低的温度下实现致密化烧结,获得了抗弯强度达430 MPa的碳/陶复合材料。     

Corrosion Behavior of TiC Particle‐Reinforced 2Cr13 Stainless Steel

The corrosion behavior of TiC particle‐reinforced 2Cr13 stainless steels prepared by in situ reaction and electroslag remelting (ESR) was investigated using potentiodynamic polarisation measurements and immersion tests. The addition of TiC particles to 2Cr13 stainless steel impeded rapid pit propagation but maintained a high corrosion rate in the whole immersion time investigated. The TiC addition developed finer matrix structure, the formation of Cr‐rich carbides and high dislocation density around the TiC particles before corrosion, which results in an increasing corrosion rate and preferential pitting attack at the steel matrix/TiC interface. Although the corrosion resistance of 2Cr13 stainless steel is sharply decreased due to TiC addition, it is significantly improved after the ESR process. This is attributed to the more uniform distribution and smaller size of TiC particles, the increase of value of χ in TiCχ and the elimination of the porosity in TiC particle‐reinforced 2Cr13 stainless steel after the ESR process.     

高炉炉缸内碳氮化钛的生成机理研究

从热力学和热模拟试验两个方面研究了碳饱和铁浴内碳氮化钛的生成机理。利用CONFOCAL激光高温显微镜的试验数据重新确定了钛在碳饱和铁浴内的溶解度和碳氮化钛形成所需的最低钛含量。结果表明在碳饱和铁浴内生成碳化钛和氮化钛的最低钛含量较采用现行热力学数据计算的结果要低。采用长坩埚法研究了不同温度梯度条件下碳氮化钛的形成，结果发现碳氮化钛在温度梯度较大的耐火材料和铁水界面有团聚行为     

TiC基对称成分功能梯度材料残余热应力分析

采用有限元方法对TiC基对称成分功能梯度材料 (SCFGM)中的残余热应力进行了理论计算。在此基础上 ,采用热压烧结工艺制备了表面无宏观缺陷的TiC(Mo ,Ni) x/TiC(Mo ,Ni) y/TiC(Mo ,Ni) x对称成分功能梯度材料。力学性能测试表明 ,对称成分功能梯度材料较之相应单一组分材料而言 ,在抗弯强度、断裂韧性等力学性能方面有较大程度的提高。这也表明 ,通过材料设计的手段可以改善材料的某些力学性能     

Chemically induced reduction: A viable process for synthesizing γ-TiAl based intermetallic matrix composite powders containing nanocrystalline TiC

A chemically induced reduction process has been developed for synthesizing intermetallic matrix composites (IMCs) consisting of titanium aluminide and titanium carbide. The process involves the reduction of metal chlorides (TiCl₄ and AlCl₃) with metallic lithium in polar organic solvents such as acetonitrile (MeCN) and tetrahydrofuran (THF) to form a colloidal precursor. The as-prepared precursors have been either directly heat treated in ultra-high-purity argon (UHP-Ar) or pretreated in hydrogen (H₂) followed by further heat treatment in UHP-Ar. The powders have been characterized primarily using X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). Results of the structural analyses conducted on the heat-treated precursors derived using MeCN as a solvent indicate the formation of either single-phase titanium carbide (TiC) or a composite mixture of γ-TiAl and nanocrystalline TiC, depending on the heat-treatment conditions. The formation of TiC is related to the strong interaction between TiCl₄ and the polar organic solvents, resulting in the formation of adducts which contain primary Ti-C linkages. Pretreatment of the precursors derived using MeCN as a solvent in H₂ promotes the removal of carbon and results in the formation of the composite mixture of γ-TiAl and TiC after subsequent Ar treatment at 1200 °C. At this stage, washing the pretreated powders in water helps to minimize and even eliminate any impurity phases to a large extent, leaving behind phase-pure composites containing γ-TiAl and TiC after the final Ar treatment. However, extended pretreatment in H₂ appears to be ineffective toward removal of additional carbon and leads to formation of hydride-phase impurities. On the other hand, the reductive reaction conducted using THF as a solvent results in minimizing the amount of carbon while inducing the formation of γ-TiAl during direct Ar treatment of the precursors. This is because of the weaker interaction between TiCl₄ and THF. Transmission electron microscopy was used to characterize the size distribution of the constituent phases. The analysis shows that the composite synthesized using these chemical approaches consist of discrete nanocrystalline TiC particles (<20 nm) that are uniformly distributed intermixed with submicron sized γ-TiAl (0.1 to 0.2 μm). Thus, the new chemical process proposed in this study demonstrates the potential for synthesizing in situ composites containing fine distribution of γ-TiAl and nanocrystalline TiC. Such composites could potentially exhibit unique mechanical properties and deformation behavior useful for high-temperature structural applications.     

卷取温度对Ti-IF钢第二相粒子及晶粒尺寸的影响

采用热模拟技术，研究了卷取温度对Ti-IF钢第二相粒子析出行为及晶粒尺寸的影响，结果表明，卷取温度的变化，对TiN,TiS和Ti4C2S2粒子的影响不大，但对TiC粒子的影响较大，高温卷取有利于TiC粒子的析出，长大，高温卷取有利于铁素体晶料珠长大，碳含量较高，会析出较多的TiC粒子，对退火织构的发展不利。     

Efficient Synthesis and Characterization of Nanostructured TiC Powder by Reaction Milling

Nanocrystalline TiC powder is synthesized from corresponding elemental constituents by reaction milling in a dual drive planetary mill. The study shows nanocrystalline TiC powder could be produced from Ti + graphite and Ti + activated carbon powder after 10 h of milling. Raman spectroscopy provides evidence in support of formation of TiC after 10 h of milling. Scanning electron microscopy reveals the size reduction and morphology of particles at different stages of milling. Transmission electron microscopy shows the formation of nanocrystalline TiC powder with particle size in the range of 50–200 nm. The lattice parameter of TiC (fcc) has been precisely calculated from first two strong peaks as 0.42 nm.     

绝热燃烧温度对TiC-TiB2复合陶瓷物相及组织的影响

以B4C粉、Ti粉、CrO3粉以及Al粉为原料,采用超重力下自挤压辅助燃烧合成技术,以快速凝固方式制备出不同绝热燃烧温度的TiC-TiB2复合陶瓷.XRD、FESEM与EDS结果表明,TiC-TiB2复合陶瓷基体主要由片状的TiB2晶粒构成,同时在TiB2基体间还分布着少量不规则的TiC,(Ti,Cr,Al)C1-x及Al2O3残余夹杂物.随着绝热燃烧温度的升高,Al2O3的含量先减少后增加,(Ti,Cr,Al) C1-x的含量逐渐增加,TiB2与TiC的含量基本不变.     

Production of gradient structures in sintered TiC−(Ni,Mo) hard alloys on interaction with molten metals

Kinetic trends have been identified for mass transport of molten metals into sintered TiC?(Ni, Mo) hard alloys. Conditions have been identified for the mass transfer of the liquid by the migration and diffusion-migration mechanisms. Details are given of the formation of gradient structure in the TiC?(Ni, Mo) hard alloys on interaction with molten metals, where it is found that there are effects from the physicomechanical properties of the materials.