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本研究的主要目的是研究加工工艺对Ti6Al4V生物医学合金显微组织、硬度和摩擦学行为(摩擦和磨损行为)的影响.加工工艺包括传统铸造、热压缩和选择激光熔化.采用X射线衍射技术、维氏硬度测试和Ti6Al4V/Al2O3摩擦副的往复式球板磨损实验对Ti6Al4V生物医学合金的冶金、力学和摩擦学性能进行表征.结果表面,加工工艺路线对合金的显微组织、硬度和磨损行为的影响很大.采用选择激光熔化工艺获得的Ti6Al4V合金具有最高的硬度和最佳的耐磨性能,这是由于与采用热压缩和传统铸造工艺相比,选择激光熔化工艺具有显著不同的冷却速率,这使得合金具有明显不同的显微组织.本研究评估和证明选择激光熔化工艺在制备高耐磨Ti6Al4V生物植入体方面具有较大潜力.

关键词: 生物医学合金 , Ti6Al4V合金 , 磨损行为 , 显微组织 , 选择激光熔化 , 热压缩 , 铸造

RE2O3-SiO2(RE =La,Ce)相图及其相关热力学研究

李言栋 , 李春龙 , 刘承军 , 姜茂发

稀土 doi:10.16533/J.CNKI.15-1099/TF.201606002

鉴于RE2SiO5、RE4.67Si3O13(RE=La、Ce)等稀土硅酸盐热力学数据的缺失,通过比较分析后采用较准确的Carvalho经验式、Binnewies熵值相加法、Neumann-Kopp定律、Kubaschewski法计算得到了稀土硅酸盐的标准生成焓、标准墒、Cp(298.15 K)、Cp(T)等热力学数据,对稀土硅酸盐的热力学数据进行了补充和完善.采用Redli-ch-Kister表达式得到了较为准确的La2O3-SiO2相图,在此基础上首次对Ce2O3-SiO2体系的相图进行了预测.

关键词: 稀土硅酸盐 , 热力学 , 相图 , Redlich-Kister

Phase relations in the system La2O3-B2O3-P2O5

Journal of Alloys and Compounds

The subsolidus phase relations in the system La2O3-B2O3-P2O5 were investigated. The system can be divided into 12 three-phase regions. There are nine binary compounds and one ternary compound in this system. The ternary compound La7O6(BO3)(PO4)(2) has a monoclinic structure, space groups P2(1)/n, with lattice constants a = 7.0172 Angstrom, b = 17.9125 Angstrom, c = 12.6500 Angstrom, beta = 97.516 degrees, V = 1576.39 Angstrom(3), and Z = 4.

关键词: La2O3-B-3-B2O3-P2O5 system;phase relations;ternary compounds

Magnetic properties and exchange bias in Mn(2)O(3)/Mn(3)O(4) nanoclusters

Journal of Applied Physics

Mn(2)O(3)/Mn(3)O(4) nanoclusters were prepared by air oxidation of Mn(3)O(4) nanoparticles. The nanoparticles located at the surface of the Mn(2)O(3)/Mn(3)O(4) nanoclusters are oxidized to Mn(3)O(4) to form the special structure of the Mn(2)O(3)/Mn(3)O(4) nanoclusters. An exchange bias was observed in the Mn(2)O(3)/Mn(3)O(4) nanoclusters, which was induced by exchange coupling between ferromagnetic Mn(3)O(4) and antiferromagnetic Mn(3)O(4) phases. (C) 2009 American Institute of Physics. [DOI: 10.1063/1.3055349]

关键词: mn3o4;nanoparticles;anisotropy;particles;nanorods;mn2o3

Gibbs Free Energy of Formation of 3Y_2O_3·5Al_2O_3

XU Xiuguang WANG Changzhen TU Ganfeng Northeast University of Technology , Shenyang , China.

材料科学技术（英文）

Thermodynamic properties of 3Y_2O_3·5Al_2O_3 double compound have been determined with CaF_2 single crystal electrolyte galvanic cell at 1049 K to 1230 K.The galvanic cell used can be expressed as: Pt,O_2(g)丨Y_2O_3(s),YOF_((s))丨CaF_2丨YOF_((s)), 3Y_2O_3·5Al_2O_(3(s))丨Al_2O_(3(s))丨O_2(g),Pt, of which the cell reaction is; 3Y_2O_(3(s))+SAl_2O_(3(s))=3Y_2O_3·SAl_2O_(3(s)) The following result is obtained: A_fG°(3Y_2O_3·5Al_2O_3)=-939500+765.90T±710J/mol where,△fG°(3Y_2O_3·5Al_2O_3)is the free energy of formation of 3Y_2O_3·5Al_2O_3 from Y_2O_3 and Al_2O_3.

关键词: rare earth , null , null

Na_2O-Ga_2O_3系相平衡研究

王新华 , 古山贞夫 , 福泽章

金属学报

用示差热分析(DTA)和X射线衍射(XRD)方法测定Na_2O—Ga_2O_3(>50mol％Ga_2O_3)系相平衡图结果表明,该二元系中有Na_2OGa_2O_3,2Na_2O 3Ga_2O_3,Na_2O 3Ga_2O_3和Na_2O 5Ga_2O_3四个中间化合物2Na_2O 3Ga_2O_3在温度高于976±8℃时分解为Na_2O Ga_2O_3和Na_2O 3Ga_2O_3 Na_2O Ga_2O_3,Na_2O 3Ga_2O_3和Na_2O 5Ga_2O_3均为异分熔化化合物,其熔化分解温度分别为1382±1℃,1285±5℃和1417±4℃给出了新发现的化合物2Na_2O·3Ga_2O_3和Na_2O_3 Ga_2O_3的X射线衍射特征数据

关键词: Na_2O , Ga_2O_3 , Na_2O·Ga_2O_3 , 2Na_2O·3Ga_2O_3 , Na_2O·3Ga_2O_3 , Na_2O·5Ga_2O_3 , phase relation , phase diagram , null , null , null , null

Electrical Relaxation in Mixed Alkali Bi2O3-K2O-Li2O-Fe2O3 Glasses

E.E.Shaisha , Sh.F.El-Desouki , I.Shaltout , A.A.Bahgat

材料科学技术（英文）

A new glass system (Bi2O3)50(Fe2O3)10(Li2O)x(K2O)40-x, where x changes in steps of 5 mole fraction between 0 and 40, was selected to study the electrical relaxation and the mixed alkali effect (MAE) phenomena. Measurements of ac conductivity σac, dielectric permittivity ε' and loss factor tan± in the frequency range of 0.12~102 kHz and in the temperature range of 300~650 K were carried out. The temperature dependence of the ac conductivity shows a slow increasing rate at low temperature and high frequency and a rapid increase at high temperature and low frequency. At constant temperature, the ac conductivity is found to be proportional to ωs, where s is the frequency exponent, which is less than 1. Analysis of the conductivity data and the frequency exponent shows that the overlapping large polaron tunnelling (OLPT) model of ions is the most favorable mechanism for the ac conduction in the present glass system. The ac response, the dc conductivity and dielectric relaxation have the same activation energy and they originate from the same basic transport mechanism. The results of the dielectric permittivity show no maximum peak in the temperature and frequency range studied. This absence of maximum peak is an indication of non-ferroelectric behavior of all the studied samples. The MAE has been detected in the ac conductivity, which is the same as the classical MAE in the dc conductivity. The electrical parameters such as dielectric permittivity ε' and real dielectric modulus M' show a typical minimum deviation from linearity by about two orders of magnitude. The loss factor tanδ and the imaginary dielectric modulus M" are insignificantly dependent on composition even at the same transition temperature Tg.

关键词: Dielectric permittivity , null , null , null

Li2O-Na2O-K2O-CaO-MgO-Al2O3-SiO2系统乳浊釉的研究

滕元成

硅酸盐通报 doi:10.3969/j.issn.1001-1625.2002.06.002

对Li2O-Na2O-K2O-CaO-MgO-Al2O3-SiO2系统釉进行了较全面的正交试验研究,找到了影响该系统釉乳浊及釉面质量的主次因素,获得了性能良好的乳浊釉及其较优乳浊釉配方.

关键词: Li2O , 正交试验 , 乳浊釉

Na2O-Al2O3-B2O3玻璃的热学性质和红外光谱

殷海荣 , 武丽华 , 陈福 , 安百江

硅酸盐通报 doi:10.3969/j.issn.1001-1625.2006.04.035

制备了Na2O-Al2O3-B2O3系统低熔点玻璃,确定了Na2O-Al2O3-B2O3系统玻璃成玻范围,研究了玻璃的转变温度(Tg)、热膨胀系数(α)和玻璃的红外光谱,表明这种玻璃的熔化温度低、转变温度也较低、玻璃的热膨胀系数较大,在近红外区有一水分的吸收带,在中红外区有B-O、Al-O的特征吸收带,以及玻璃的Tg、α与玻璃组成的关系.

关键词: 硼酸盐玻璃 , 低熔点玻璃 , 热性质 , 红外光谱