钛表面涂覆类金刚石碳膜的生物相容性研究

将涂覆金刚石碳（ＤＬＣ）膜的金属钛植入狗的下颌骨，用Ｘ射线，光镜，透射电镜（ＴＥＭ）和扫描电镜（ＳＥＭ）等手段观测新骨细胞形貌，数量，琥珀酸脱氢酶（ＳＤＨ）的活性以及种植体表面的骨结合情况。结果表明，用直流辉光放电法制备的ＤＬＣ涂膜明显改善钛植入体的生物相容性。     

非晶金刚石膜的电子场发射性能研究

研究了用真空磁过滤弧沉积（ＦＡＤ）方法制备的非晶金刚石薄膜（ａＤＦ）的电子场发射性能，其最小阈值电压为２．１Ｖ。ｓｐ３键含量不同的ａＤＦ发射性能也不同，适当的ｓｐ２键含量能降低阈值电压，提高ｓｐ３键含量能提高发射稳定性。根据实验结果提出了一种发射机制。     

类金刚石薄膜作为HgCdTe红外器件增透膜和钝化膜的研究

采用高频等离子体化学气相色沉积法（ＲＦＣＶＤ）在ＨｇＣｄＴｅ红外器件上沉积类金刚石薄膜，俄歇电子能谱对ＤＬＣ／ＨｇＣｄＴｅ界面分析结果表明类金刚石薄膜中的碳原子对衬底材料影响较小，７０ｎｍ的类金刚石薄膜抑制衬底组份的外扩散，而且具有纯度较高的类金刚石薄膜外表面层，是一种理想的钝化膜材料，红外透射光谱测试结果表明类金刚石薄膜在较宽的波长范围内（４－１２μｍ）具有明显的增透效应。     

离子束增强沉积制备TiB2薄膜及其性能研究

用离子束增强沉积法（ＩＢＥＤ）在硅及铜基体上沉积了ＴｉＢ２薄膜，研究了轰击离子束能量和束流对薄膜的微结构及力学性能的影响。用俄歇电子谱（ＡＥＳ）分析了膜的成分及其界面状况，用Ｘ射线衍（ＸＲＤ）研究了膜的微结构，并测定了膜的硬度及进行膜的高温氧化试验。结果指出：（１）离子束轰击使薄膜晶化，从而影响到膜的硬度及抗高温氧化性能；（２）离子呸增强的二硼化钛薄膜是一种耐高温氧化的高硬膜。     

用EACVD方法合成金刚石薄膜

本文报道了用电子助进化学气相沉积（ＥＡＣＶＤ）方法合成金刚石膜的结果．用ｘ射线衍射喇曼散射和扫描电子显微镜等对合成的薄膜的性质及形貌进行了鉴定和观察，给出合成金刚石膜的工艺参数范围并简要讨论了工艺条件对膜合成的影响。主题词；电子助进化学气相沉积（ＥＡＣＶＤ）低温等离子体　金刚石膜国家自然科学基金资助课题     

γ射线辐照对类金刚石薄膜结构与特性的影响

用射频等离子体方法在玻璃基底上制备了类金刚石薄膜。分析了γ射线辐照类金刚石薄膜（以下简称ＤＬＣ薄膜）的结构与特性改变。采用Ｒａｍａｎ及红外光谱进行结构分析表明：随辐照剂量的增加，在膜中出现ＳＰ３Ｃ—Ｈ及 ＳＰ２Ｃ—Ｈ 键的断裂与减少，ＳＰ３Ｃ—Ｃ键的略微增加．当辐照剂量达 １０ ×１０４Ｇｙ时，ＳＰ３Ｃ—Ｈ键减少约５０％，与此同时，出现膜中氢的重新键合，并从中释出。γ射线辐照使ＤＬＣ薄膜的电阻率呈上升趋势，膜的类金刚石特征更加明显，结构得到改善。本文对γ射线对ＤＬＣ薄膜的辐照机制进行了简要的讨论。     

新型微波等离子体化学气相沉积金刚石薄膜装置

微波等离子体化学气相沉积（ＭＰＣＶＤ）是制备金刚石薄膜的一种重要方法。为了获得金刚石薄膜的高速率大面积沉积，在国内首次研制成功了５ｋＷ带有石英真空窗的天线耦合水冷却不锈钢反应室式ＭＰＣＶＤ装置。初步用该装置成功在硅基片上沉积得到了金刚石薄膜。     

金刚石厚膜的制备及应用研究

用电子增强热灯丝ＣＶＤ（化学汽相沉积）方法制备出膜厚为０．１－２ｍｍ的金刚石厚膜，研究了金刚石厚膜的耐磨性和热导特性，用它制作了金刚石膜焊接刀具和半导体激光器用金刚石膜热沉。     

薄膜技术

薄膜技术９９０８００１　提高金刚石膜与硬质合金结合强度的新方法——ＬｅｅＤ　Ｇ．Ｓｕｒｆａｃｅ＆ＣｏａｔｉｎｇｓＴｅｃｈｎｏｌｏｇｙ,１９９８,１００～１０１（１～３）∶１８７（英文）在硬质合金上沉积金刚石膜,由于二者热膨胀系数失配,使金刚石膜内应力较大,导致金刚石膜剥离或开裂。对基材进行改性,制备三维热力学上和成分上呈梯度变化的中间层,可提高金刚石膜与硬质合金的结合强度。在硬质合金上沉积ＷＣ,提高了硬质合金表面粗糙度,从而明显改善金刚石膜的结合强度。９９０８００２　ＣＶＤ沉积薄膜的前处理——Ａ…     

掺锡对α—Fe2O3薄膜微结构和气敏特性的影响研究

本文用常压化学气相淀积法（ＡＰＣＶＤ）制备了α－Ｆｅ２Ｏ３薄膜，对所制备的薄膜进行了Ｘ射线衍射分析和表面形貌（ＳＥＭ）分析。对薄膜的气敏特性进行了测量。结果表明，用ＡＰＣＶＤ工艺制备的α－Ｆｅ２Ｏ３薄膜对烟者极为敏感并且具有良好的选择性；本研究还对所制备的α－Ｆｅ２Ｏ３薄膜进行了有效的掺杂，对掺杂样品的气敏特性测试表明四价金属元素Ｓｎ的掺入对α－Ｆｅ２Ｏ３薄膜的气敏特性有显著的影响。实验表明用ＡＰ     

金刚石和类金刚石膜研究及其在电声领域中的应用

金刚石和类金刚石膜是当今材料界的研究热点之一，有着极其诱人的应用前景。本文简要综述了该膜系的发展过程和现在水平。并结合作者自己的研究工作，对膜系应用于扬声器振膜上以提高其高频响应范围的研究和应用工作进行较全面的调研，综述了国内外在该领域的最新进展。     

类金刚石膜的应用及制备

类金刚石膜（DLC）是由无定形碳和金刚石相混合组成的碳材料，由于具有与金刚石膜（DF）相类似的性能－优异的机械特性、电学特性、光学特性、热学和化学特性以及生物相溶性，同时制备方法相对容易实现，因此引起人们极大兴趣，现在已经应用到很多领域。本文将简要介绍类金刚石膜的性能、应用以及制备方法。     

波纹位置对顶部凹陷膜片翻转行为的影响研究

原顶部凹陷膜片的波纹结构位于膜片球形旋转段下端时, 其翻转效率较差, 针对这一问题, 该文将波纹结构设置到临近顶端凹陷区域。利用有限元法, 数值计算原膜片与改进型膜片的屈曲与后屈曲状态。对这两种膜片的研究结果进行对比分析, 得出:改进型膜片的屈曲模态更利于膜片翻转, 且翻转效率更高;改进型膜片避免了易导致原膜片失效破坏的严重偏心与褶皱问题;改进型膜片的最大应力状态较原膜片有显著降低, 可防止膜片在翻转过程中达到材料的极限应力而发生破裂。     

锥角对锥柱形贮箱金属膜片翻转行为的影响

该文针对锥柱形贮箱膜片,选取不同的金属材料(纯钛、304L 不锈钢、铝),系统研究了锥角为8°~12°时,金属贮箱膜片翻转过程中出现的结构屈曲和后屈曲状态,这一过程涉及材料与几何非线性。膜片在翻转过程中,当载荷增加至结构的临界载荷时,结构的切线刚度趋于零,传统的Newton-Raphson法难以追踪后屈曲平衡路径,通过弧长法,准确求解了结构的后屈曲平衡状态。数值计算得出:锥角对不同材质膜片的翻转行为的影响,304L不锈钢最显著,纯钛次之,铝最不显著;结构屈曲载荷及后屈曲状态时膜片的承载能力均随锥角的增加而减小;10°锥角为最优解,这一角度兼顾了膜片内部容积和翻转效率这两个因素。     

Vibration of micromachined circular piezoelectric diaphragms

Electrically and mechanically excited resonances in micromachined circular piezoelectric diaphragms have been investigated. The diaphragm structures were piezoelectric unimorphs consisting of Pb(Zr0.52,Ti0.48)O3 (PZT) films and thermally grown silicon oxide (SiO2) layers. For electrical excitation, ring-shaped interdigitated (IDT) electrodes formed on the top of the PZT layer were used to induce strain in the diaphragms. The diaphragm structures behaved much like circular membranes in which the membrane tension was approximately 206 N/m, at the fundamental modes. For higher modes, the resonance frequencies deviated from the theoretical values due to the finite stiffness of the diaphragms. Under mechanical drive, both symmetric and asymmetric modes were excited. However, for electrical excitation, the symmetric modes were dominant due to the symmetry of the driving IDT electrodes. At a pressure of 727 Torr, the quality factor was approximately 250, and this rose to 2000 at pressures below 1 Torr. When a forward bias was applied to the diaphragm, the membrane tension decreased, but under reverse biases the tension increased. However, because of repoling under reverse biases greater than the coercive field of the PZT film, the achievable increase in the membrane tension was limited. In the diaphragm structure, the nonlinear vibration was governed by geometric nonlinearity rather than material nonlinearity. In addition, evidence of non-180 degrees domain wall motion of the PZT layer in released diaphragms was observed.     

Storage ring vacuum system pressure modelling at Diamond

Two complementary vacuum system simulation programs, “MCTPVac” and “Pressure Profile”, have been developed and tested at Diamond and used to model sections of the Diamond storage ring. The MCTPVac program implements the Monte Carlo Test Particle (MCTP) method in 3 dimensions. The Pressure Profile program uses a 1-dimensional method based on a steady-state diffusion equation. The validity of the MCTPVac program is confirmed by comparison with previously-published results and formulae for simple geometries. The pressure predictions made by the two methods for the Diamond storage ring injection straight are then compared with each other and to actual observed pressures.     

Friction of diamond,syndite and amborite sliding on various alloys

This study describes the movement of styli of diamond, Syndite and Amborite (products of De Beers Industrial Diamond Division, Charters, UK) back and forth across a range of substrate materials and the coefficients of friction recorded. Syndite and Amborite are products made by heating polycrystalline diamond or cubic boron nitride at high pressure in the presence of suitable metallic binders. Diamond, Syndite and Amborite all have applications in machining, wire drawing, turning etc., though the relative performance depends on the material being worked. Results for a range of metals and alloys are discussed. It is shown that the trends found in machining practice are also reflected in the frictional properties. Although the loads and speeds are much lower in the friction experiments, it appears that monitoring the friction for repeated traversais does give important information and allows a more controlled study of the processes occurring between the stylus and work-piece such as film transfer, the effect of lubricants etc.     

In vitro study on the influence of strontium-doped calcium polyphosphate on the angiogenesis-related behaviors of HUVECs

Angiogenesis is of great importance in bone tissue engineering, and has gained large attention in the past decade. Strontium-doped calcium polyphosphate (SCPP) is a novel biodegradable material which has been proved to be able to promote in vivo angiogenesis during bone regeneration. An in vitro culture system was developed in the present work to examine its influence on angiogenesis-related behaviors of human umbilical vein endothelial cells (HUVECs), including cell adhesion, spreading, proliferation and migration. The effects of microtopography, chemical property and the ingredients in the degradation fluid (DF) on cell behaviors were discussed. The results showed that cells attached and spread better on SCPP scaffold than on calcium polyphosphate (CPP), which might partially result from the less rough surface of SCPP scaffold and the less hydrogel formed on the surface. In addition, cell proliferation was significantly improved when treated with SCPP DF compared with the treatment with CPP DF. Statistical analysis indicated that Sr(2+) in SCPP DF might be the main reason for the improved cell proliferation. Moreover, cell migration, another important step during angiogenesis, was evidently stimulated by SCPP DF. The improved in vivo angiogenesis by SCPP might be assigned to its better surface properties and strontium in the DF. This work also provides a new method for in vitro evaluation of biodegradable materials' potential effects on angiogenesis.     

方钢管混凝土柱节点的试验研究及非线性有限元分析

基于方钢管混凝土柱内隔板式节点及外加强环式节点的低周反复荷载试验,在合理选择材料本构关系、破坏准则的基础上,采用通用有限元软件ANSYS对方钢管混凝土柱内隔板式节点和外加强环式节点进行了单调加载及循环加载作用下的受力性能分析。有限元分析得出的荷载-位移曲线及剪力-剪切变形曲线与试验结果吻合较好。在此基础上对外加强环式节点进行了参数分析,研究了方钢管混凝土柱的轴压比、宽厚比、核心混凝土强度及混凝土楼板高度对节点受力性能的影响,结果表明轴压比、宽厚比的影响较大。