压铸模CAD/CAE/CAM

介绍了压铸模CAD／CAE／CAM一体化技术的主要内容和实现CAD／CAE／CAM一体化的技术路线。实践应用表明，CAD／CAE／CAM一体化技术能有效地指导压铸模具的设计、模拟分析与制造过程，提高模具结构的合理性、准确性和加工精度，服务于实际压铸件生产。     

模具CAD/CAM/CAE集成制造在铸造中的应用

介绍模具CAD／CAM／CAE集成制造系统在铸造模具中的应用，内容包括：基于UnigraphicsⅡ，ProCAST以及数控加工中心，三坐测量仪等软、硬件设备的模具CAD／CAM／CAE集成制造系统。利用该系统制造涡轮增压器铸造模具，克服传统方法的缺点，节省设计制造周期，提高产品生产品质和效率。     

压铸模CAD/CAE/CAM的现状与发展对策

分析了我国压铸模设计与制造的现状、存在的问题，介绍了国内外压铸模CAD／CAE／CAM技术的研究进展，根据我国压铸模CAD／CAE／CAM技术研究与开发存在的问题提出了加快发展我国压铸模CAD／CAE／CAM技术对策。     

铝型材挤压模具CAD/CAE/CAM集成系统研究

论述了铝型材挤压模具CAD／CAE／CAM集成系统的特点，介绍了CAD／CAE／CAM技术的应用现状，提出了CAD／CAE／CAM一体化导示图，指出了CAD／CAE／CAM集成系统的发展方向。     

基于网络的CAD/CAE/CAM/ERP在挤出模设计及制造中的应用

通过构建基于网络技术的综合信息平台、基于ERP和基于并行工程的CAD／CAE／CAM系统的智能化局域网络系统，分析CAD／CAE／CAM，ERP在挤出模设计及制造中的应用。     

Pro/E模具设计、分析、制造集成解决方案

１Pro／E软件的集成制造技术模具CAD／CAE／CAM系统的集成关键是建立单一的图形数据库、在CAD、CAE、CAM各单元之间实现数据的自动传递与转换，使CAM、CAE阶段完全吸收CAD阶段的三维图形，减少中间建模的时间和误差；借助计算机对模具性能、模具结构、加工精度、金属液体在模具中的流动情况及模具工作过程中的温度分布情况等进行反复修改和优化，将问题发现于正式生产前，大大缩短制模时间，提高模具加工精度。Pro／E软件采用面向对象的统一数据库和参数化造型技术，具备概念设计、基础设计和详细设计的功能，为模具的集成制造…     

快速缸体铸件开发

以缸体铸件开发为例，应用CAD／CAE／CAM并行工程、虚拟制造和先期产品质量策划等现代技术和方法进行复杂铸件缸体的快速开发，结果表明：运用现代设计、制造和管理技术，可使产品开发速度加快，质量提高，成本降低。     

硬质合金立铣刀CAD/CAE/CAM集成系统的实现

文章建立了CAD／CAE／CAM集成系统的总体框架，实现了资源数据的管理。采用基于特征的建模技术，应用计算机辅助设计、有限元分析及加工制造相关理论和技术，完成了“硬质合金立铣刀CAD／CAE／CAM集成系统”的开发。     

CAD/CAE/CAM技术在现代塑料模设计制造中的应用

介绍了CAD/CAE/CAM技术在现代塑料模设计与制造中的应用,采用CAD/CAE/CAM技术可提高模具产品的设计质量、缩短模具设计与制造周期、降低产品成本。还简要介绍了并行工程、逆向工程、知识工程在塑料模中的应用,展望了现代塑料模设计制造技术的发展。     

CAD/CAM集成技术在冲压模具生产中的应用

介绍了CAD／CAM集成技术在冲压模具生产中的作用，论述了现代冲压件对CAD／CAE／CAM集成的要求及方法。     

Structural, mechanical and corrosion properties of TiOxNy/ZrOxNy multilayer coatings

Results on the deposition and characterization of TiO_xN_y/ZrO_xN_y multilayers, with bilayer periods of 20 and 400 nm, are presented. The coatings were deposited on TiNiNb alloy substrates by the pulsed magnetron sputtering method. The elemental composition, hardness, adhesion and corrosion resistance of the coatings were analyzed.As resulted from the XPS analysis, the individual layers consisted of a mixture of titanium or zirconium oxynitrides and corresponding oxides. X-ray analysis revealed that the coatings were amorphous. Only slight differences between the microhardness and adhesion values of the coatings with small and large bilayer period Λ were found. The experiments also showed that the multilayered coatings improved the corrosion resistance of the uncoated alloy and reduced the amount of ion release in artificial body fluids.     

生物医用NiTi形状记忆合金腐蚀研究进展

镍钛形状记忆合金(NiTi-SMA)具有较好的耐腐蚀和机械性能,在口腔和临床医学中有着大量而广泛的应用。NiTi-SMA腐蚀后释放Ni²⁺会引发细胞毒性和过敏反应,进一步提高NiTi-SMA的耐蚀性是目前生物医学材料领域发展的核心之一。本文对近年来国内外有关口腔医学和临床医学中常用NiTi-SMA的腐蚀研究现状进行了总结,同时也对NiTi-SMA增材制造及表面改性技术进行了评述,以期为开发高性能抗腐蚀生物医用NiTi-SMA提供一定的指导意义。     

Li掺杂Ba(Ti1/7Sn1/7Zr1/7Hf1/7Nb1/7Ga1/7Li(1/7-x))O3高熵陶瓷的制备及介电性能研究

近年来,在高熵合金基础上发展起来的高熵陶瓷逐渐引起了研究者的广泛关注,其出现为开发高性能的无机非金属材料提供了新的设计思路。本文采用固相法制备了BaMO3基钙钛矿型高熵陶瓷Ba(Ti1/7Sn1/7Zr1/7Hf1/7Nb1/7Ga1/7Li(1/7-x))O3 (x = 0, 2.3%, 5.3%, 8.3%, 11.3%),并研究了Li含量对高熵陶瓷物相结构、微观形貌及介电性能的影响。结果表明,Li含量对陶瓷结构的影响不大,陶瓷均保持立方钙钛矿结构,且无杂相产生;陶瓷的晶粒尺寸相对较均匀。当x = 0时,即B位七元等摩尔比Ba(Ti1/7Sn1/7Zr1/7Hf1/7Nb1/7Ga1/7Li1/7)O3高熵陶瓷,其介电常数达到了最大值2920 (@100 Hz),相较于已报道的不掺Li的六元高熵钙钛矿陶瓷Ba(Ti1/6Sn1/6Zr1/6Hf1/6Nb1/6Ga1/6)O3提升了近50倍。     

MOCVD growth and characterizations of BxAl1−xAs and BxAl1−x−yInyAs alloys

Zinc-blende B_xAl_1−xAs and B_xAl_1−x−yIn_yAs alloys have been grown on exactly oriented (0 0 1)GaAs substrates by low pressure metalorganic chemical vapor deposition (LP-MOCVD). The influence of susceptor coating, growth temperature and gas-phase boron mole fraction on boron incorporation into AlAs has been comprehensively investigated. It has been found that boron incorporation into AlAs could be enhanced and the optimal growth temperature range of B_xAl_1−xAs alloys changed from 580 °C to 610 °C when SiC-coated graphite susceptors were replaced by the non-coated ones. In this study, the maximum boron composition x of 2.8% was achieved for the pseudomorphically strained B_xAl_1−xAs alloys. AFM measurements show that RMS roughness of B_xAl_1−xAs alloys increased sharply with the increase of gas-phase boron mole fraction. Raman spectra of B_xAl_1−xAs alloys show a linear increase of the BAs shift with boron composition x. Based on BAlAs deposition, bulk B_xAl_1−x−yIn_yAs (x = 1.9%) quaternary alloy was grown lattice-matched to GaAs successfully. Moreover, 10-period BAlAs/GaAs and BAlInAs/GaAs MQW heterostructures were also demonstrated.     

Hydrothermal synthesis of superconductors Ba1−xKxBiO3 and double perovskites Ba1−xKxBi1−yNayO3

Superconductors Ba_1−xK_xBiO₃ and body-centered double perovskites Ba_1−xK_xBi_1−yNa_yO₃ have been selectively synthesized by a facile hydrothermal route. The appropriate ratio and adding sequence of initial reagents, alkalinity, reaction temperature and time are the critical factors that influence the crystal growth of the compounds. The purity and homogeneity of the crystals were detected by the ICP, SEM, EDX and TEM studies. Magnetic measurements show that the superconducting transition temperatures T_C of Ba_1−xK_xBiO₃ decrease from 22 K (for x = 0.35) to 8 K (for x = 0.55) with increasing the K doping level.     

Magnetic phase diagrams of the TbRh2−xPdxPdxSi2 and TbRu2−xPdxSi2 systems

The a.c. susceptibility and high field magnetization on TbRh_2−xPd_xPd_xSi₂ and TbRu_2−xPd_xSi₂ compounds were investigated up to 140 kOe. The (T,x) magnetic phase diagrams were determined. For both systems, an increase in the Pd content causes a decrease in the Néel temperature and changes the magnetization curves.     

High strength and good ductility of casting Al-Cu alloy modified by PrxOy and LaxOy

A modified Al-Cu alloy with high tensile strength and ductility of about 574.0 MPa and 10.4%, respectively, was obtained by adding multiple rare earth oxides (Pr_xO_y and La_xO_y) as modifier. Compared with the unmodified Al-Cu alloy, the tensile strength and ductility of the modified sample were increased by 24.3% and 42.5%, respectively. The improvement both in the strength and ductility may attribute to the finer crystal grains and dendrites, more homogeneously distributed θ′ phase precipitates and the intermetallic compounds formed at the crystal grain boundaries as well as in the space of the dendrites.     

Structural analysis of sputtered (W-C)1−xMx (MFe, Co) films with 0x0.20

Structural characterization of (W-C)_1-xM_x (MFe, Co) films with 0x0.20 was carried out using electron probe microanal ysis (EPMA), X-ray diffraction (XRD) and transmission electron microscopy-electron diffraction (TEM-ED). The results showed that the structure of these films depends on the percentage of iron and cobalt and becomes amorphous with increasing content of these elements. The microstructure of the crystalline coatings was found to be composed of small grains of β-WC_1-x with a high number of defects. A strong β-WC_1-x[311] texture was observed for iron and cobalt contents around 5.5 at.%. The films richer in iron and cobalt showed typical amorphous XRD and ED patterns, exhibiting two broad peaks and two wide diffuse rings respectively. Moreover, bright-field analysis revealed fairly contrasted images, the structure of these films being difficult to resolve.     

Si3N4/Ti/Cu/Ni/Cu/Ti/Si3N4二次部分瞬间液相连接强度

采用Ti/Cu／Ni中间层对Si3N4陶瓷进行二次部分瞬间液相(PTLP)连接，研究连接工艺参数对Si3N4／Ti/Cu／Ni连接强度的影响，同时研究了连接强度随试验温度的变化规律。结果表明，在该试验条件下，室温连接强度随着二次连接温度的提高和二次保温时间的延长而提高，改变连接工艺参数对Si3N4／Ti/Cu／Ni二次PTLP连接界面反应层厚度无明显影响；连接强度在试验温度400℃时达到最大，随后随试验温度升高，连接强度降低，但在800℃前，其高温强度具有很好的稳定性。