TiO2-ZnO系尖晶石型红外辐射涂料的制备和研究

以Fe2O3-MgO-cordierite体系为基础,用不同质量分数TiO2和ZnO进行掺杂,制得具有高发射率的尖晶石型红外辐射涂料。通过XRD、SEM、红外发射率测试、傅立叶变换红外光谱测试、抗热震性测试等测试方法对所制备的红外辐射涂料的物相、微观形貌、红外发射率和抗热震性能进行分析。结果表明,经高温烧结后生成了ZnFe2O4、TiMg2O4、MgFe2O4尖晶石结构,当TiO2质量分数为10%时,涂料在8～14 m波段的发射率最高达到0.963,并且抗热震性良好。     

8~14μm波段水性红外隐身涂料研究

从基体树脂、填料和涂层综合性能三方面对8~14m波段水性红外隐身涂料进行了研究。用红外发射率测量仪测量了涂层在8~14m波段的红外发射率,用红外光谱仪测量了树脂红外吸收图谱,用扫描电镜观察了涂层表面形貌。结果表明,丙烯酸树脂在8~14m波段有较高的红外透明性,适合做涂料基体树脂;铝银浆能在涂层中形成致密的反射层,适合做红外隐身涂料的填料;填料的粒径、含量和形态都对涂层的发射率有较大的影响;选用钢板为基材,以丙烯酸树脂为基体树脂,粒径2000目、浮铝百分比为50%的铝银浆为填料,当涂层中填料含量为15%时,测得其发射率为0.34。     

Cr2O3-MnO2系高温红外陶瓷涂层的制备与研究

以MnO2、Cr2O3、CuO,TiO2粉末为原料按比例混合,制备成团聚粉末,经等离子喷涂的方法制备红外辐射涂层.采用XRD、IR、XPS和IRE-2型红外发射率测试仪分析了涂层的结构、元素分布和其在600℃,400～4000 cm-1波段范围内的红外辐射性能.发射率最高达0.90.结果表明,涂层尖晶石结构四面体间隙和八面体间隙中离子分布和价态对涂层红外发射率具有影响,随着MnO2的添加体系红外发射率呈现先增加后减少的变化.     

几种红外辐射涂料的研制

介绍了研制高温型涂料(HKP-84)和低温型涂料(DKP-85)的工艺过程、涂层较稳定的辐射特性以及良好的抗老化性能和抗热震性能。通过试验证明,使用远红外加热必须根据被加热物体所需要的温度、吸收辐射的波长来选择涂料。     

直热式电阻带上FCA高发射率涂层的研制

介绍了一种采用类搪瓷工艺制备的FCA-1高发射率涂层,其500℃时的全发射率高达0.92,且与铁-铬-铝电阻带结合牢固,抗热震性良好,已成功地用于红外加热生产。     

等离子喷涂-激光熔覆CoCrTaAlY/YSZ热障涂层的抗高温氧化机理及热震性能

采用半导体激光熔覆技术与等离子喷涂相结合的方法,在1Cr13不锈钢基体表面制备了CoCrTaAlY/YSZ热障涂层,然后采用扫描电子显微镜(SEM)、能谱仪(EDS)及X射线衍射仪(XRD)分别对涂层的微观组织、成分分布及物相进行表征。结果表明:YSZ涂层的物相主要由ZrO_2的立方晶相(c-ZrO_2)、正方晶相(t-ZrO_2)及少量单斜相(m-ZrO_2)组成;黏结层具有典型的快速熔凝组织特征,与基体实现了冶金结合。对涂层的抗高温氧化机理、热震性能及其失效行为进行研究后发现:Al_2O_3氧化膜的形成能阻止O元素扩散,使涂层的抗高温氧化性能约为基体的4.1倍(YSZ涂层氧化累积增重仅为0.08 g·cm~(-2));YSZ涂层在900℃下热震20次后开始出现裂纹,且裂纹随热震次数增加逐渐变大,热震30次时试样完全断裂。     

不锈钢表面激光熔覆无钴镍基合金涂层研究

为满足某装置用阀门密封面材料不能含有钴的要求,通过激光熔覆两种无钴镍基合金粉末,在0Cr18Ni10Ti不锈钢表面制备出具有梯度硬度分布的较厚涂层,分析了涂层的微观组织、硬度及界面结合强度。结果表明,采用硬度较低的镍基合金涂层作为过渡层,解决了具有较高硬度镍基合金涂层的开裂问题;涂层与基体及两种镍基合金涂层之间界面连续过渡,硬度呈梯度变化,涂层表面硬度达HRC47;涂层与基体界面为完全冶金结合,其界面结合强度大于565MPa;经弯曲及热震试验后,涂层未出现开裂及剥落现象,说明涂层具有良好的抗热震性能。     

纤维基低发射率隔热材料制备研究

兼具表面低红外发射率和隔热性能的功能纺织材料在工业及军事领域有着广泛用途。从利用低表面发射率和控制物体表面温度两方面,研究制备具有低红外发射率且隔热性能良好的功能材料。选用聚丙烯酸酯(PA)作为成膜粘结物质,研究了铝粉的粒径及用量对涂层红外发射率的影响;以不同的空心微珠为隔热填充剂,并对其用于涂层织物的隔热效果进行探究。最后,将低发射率涂层与隔热涂层进行复合,制备出兼具低发射率与隔热性能的材料。结果表明,采用400目片状铝粉时的发射率比采用600目时更低,20%的400目片状铝粉的涂层胶所制备的涂层表面的红外发射率低至0.237。由于空心微珠是较好的隔热填料,以共混15%的玻璃微珠为隔热层,以共混20%的400目片状铝粉为低红外发射率涂层,所制备的纤维基复合涂层材料的发射率为0.507,热体试样与背景温差为3.75℃,具有较好的隔热性能和低红外发射率。     

激光重熔等离子喷涂Al2O3-13%TiO2陶瓷涂层热震性能

为了提高等离子喷涂Al2O3-13%TiO2(质量分数)陶瓷涂层的抗热震性能,采用激光重熔工艺对涂层进行处理,研究了激光重熔对等离子喷涂层热震性能的影响,并探讨了涂层的热震失效机理.结果表明:相对于等离子喷涂试样,激光重熔涂层有较好的抗热震性能.等离子喷涂陶瓷涂层的热震失效形式基本为边角剥落,而激光重熔陶瓷涂层热震失效形式既有边角剥落又有相当数量的中间区域局部剥落.激光重熔对涂层热震性能的影响主要表现为降低涂层的初始抗破坏能力、减缓涂层的裂纹扩展速率以及改变涂层的破坏模式.     

轧辊表面激光重熔热障涂层抗热冲击性能研究

为了提高轧辊表面涂层的抗热冲击性能、延长其高温条件下的使用寿命,采用5kW CO2激光器,对轧辊表面等离子喷涂热障涂层进行了重熔处理。利用扫描电镜和能量色散谱仪,观察激光重熔涂层的涂层形貌和微观结构, 对分界面元素进行了微区成分分析。将试样在1000℃下保温10min后,放入常温(25℃)水中激冷,探究其抗热冲击性能,并与等离子喷涂涂层进行了对比。结果表明,经激光重熔后,涂层孔隙、裂纹明显减少,涂层质量明显提高;涂层与基体之间在一定程度上实现了冶金结合,结合强度明显提高;开始出现裂纹以及最终失效时的冲击循环次数由原来的14次和32次分别提高到43次和94次。该激光重熔工艺有助于提高涂层的热冲击性能,可延长轧辊的使用寿命。     

Cost-effective test solutions for smart card and other integrated flash applications

From its emergence in the late 1980s as a lower cost alternative to early EEPROM technologies, flash memory has evolved to higher densities and speedsand rapidly growing acceptance in mobile applications.In the process, flash memory devices have placed increased test requirements on manufacturers. Today, as flash device test grows in importance in China, manufacturers face growing pressure for reduced cost-oftest, increased throughput and greater return on investment for test equipment. At the same time, the move to integrated flash packages for contactless smart card applications adds a significant further challenge to manufacturers seeking rapid, low-cost test.     

An improved parallel thinning algorithm with two subiterations

The parallel thinning algorithm with two subiterations is improved in this paper. By analyzing the notions of connected components and passes, a conclusion is drawn that the number of passes and the number of eight-connected components are equal. Then the expression of the number of eight-connected components is obtained which replaces the old one in the algorithm. And a reserving condition is proposed by experiments, which alleviates the excess deletion where a diagonal line and a beeline intersect. The experimental results demonstrate that the thinned curve is almost located in the middle of the original curve connectivelv with single pixel width and the processing speed is high.     

Theoretical analysis of the relationship between the Brillouin gain coefficient and the strain in the optical-fiber sensors

The relation between the power of the Brillouin signal and the strain is one of the bases of the distributed fiber sensors of temperature and strain. The coefficient of the Bfillouin gain can be changed by the temperature and the strain that will affect the power of the Brillouin scattering. The relation between the change of the Brillouin gain coefficient and the strain is thought to be linear by many researchers. However, it is not always linear based on the theoretical analysis and numerical simulation. Therefore, errors will be caused if the relation between the change of the Brillouin gain coefficient and the strain is regarded as to be linear approximately for measuring the temperature and the strain. For this reason, the influence of the parameters on the Brillouin gain coefficient is proposed through theoretical analysis and numerical simulation.     

Novel fiber-optical interferometer with miniaturized probe for in-hole measurements

Today, micro-system technology and the development of new MEMS （Micro-Electro-Mechanical Systems） are emerging rapidly. In order for this development to become a success in the long run, measurement systems have to ensure product quality. Most often, MEMS have to be tested by means of functionality or destructive tests. One reason for this is that there are no suitable systems or sensing probes available which can be used for the measurement of quasi inaccessible features like small holes or cavities. We present a measurement system that could be used for these kinds of measurements. The system combines a fiber optical, miniaturized sensing probe with low-coherence interferometry, so that absolute distance measurements with nanometer accuracy are possible.     

Curved crystal spectrometer for the measurement of X-ray lines from laser-produced plasmas

In order to diagnose the laser-produced plasmas, a focusing curved crystal spectrometer has been developed for measuring the X-ray lines radiated from a laser-produced plasmas. The design is based on the fact that the ray emitted from a source located at one focus of an ellipse will converge on the other focus by the reflection of the elliptical surface. The focal length and the eccentricity of the ellipse are 1350 mm and 0.9586, respectively. The spectrometer can be used to measure the X- ray lines in the wavelength range of 0.2-0.37 nm, and a LiF crystal （200） （2d = 0.4027 nm） is used as dispersive element covering Bragg angle from 30° to 67.5°. The spectrometer was tested on Shengnang- Ⅱ which can deliver laser energy of 60-80 J/pulse and the laser wavelength is 0.35 μm. Photographs of spectra including the 1 s2p ^1P1-1s^2 ^1S0 resonance line（w）, the 1s2p ^3P2-1s^2 1S0 magnetic quadrupole line（x）, the 1s2p ^3P1-1 s^2 ^1S0 intercombination lines（y）, the 1 s2p ^3S~1-1 s^2 ^1S0 forbidden line（z） in helium-like Ti Ⅹ Ⅺ and the 1 s2s2p ^2P3/2-1 s622s ^2S1/2 line（q） in lithium-like Ti Ⅹ Ⅹhave been recorded with a X-ray CCD camera. The experimental result shows that the wavelength resolution（λ/△ 2） is above 1000 and the elliptical crystal spectrometer is suitable for X-ray spectroscopy.     

Preparation and Characterization of TaN ALD Precursors

High purity organic-tantalum precursors for thin film ALD TaN were synthesized and characterized.Vapor pressure and thermal stability of these precursors were studied.From the vapor pressure analysis,it was found that TBTEMT has a higher vapor pressure than any other published liquid TaN precursor,including TBTDET,TAITMATA,and IPTDET.Thermal stability of the alkyl groups on the precursors was investigated using a 1H NMR technique.The results indicated that the tertbutylimino group is the most stable group on TBTDET and TBTEMT as compared to the dialkylamido groups.Thermal stability of TaN precursors decreased in the following order:TBTDET ＞ PDMAT ＞ TBTEMT.In conclusion,precursor vapor pressure and thermal stability were tuned by making slight variations in the ligand sphere around the metal center.     

Electronic Structure of Semiconductor Nanocrystals

This paper reviews our recent development of the use of the large-scale pseudopotential method to calculate the electronic structure of semiconductor nanocrystals, such as quantum dots and wires, which often contain tens of thousands of atoms. The calculated size-dependent exciton energies and absorption spectra of quantum dots and wires are in good agreement with experiments. We show that the electronic structure of a nanocrystal can be tuned not only by its size,but also by its shape. Finally,we show that defect properties in quantum dots can be significantly different from those in bulk semiconductors.     

Teleportation of an arbitrary unknown N-qubit entangled state under the controlling of M controllers

A new quantum protocol to teleport an arbitrary unknown N-qubit entangled state from a sender to a fixed receiver under M controllers(M < N) is proposed. The quantum resources required are M non-maximally entangled Greenberger-Home-Zeilinger (GHZ) state and N-M non-maximally entangled Einstein-Podolsky-Rosen (EPR) pairs. The sender performs N generalized Bell-state measurements on the 2N particles. Controllers take M single-particle measurement along x-axis, and the receiver needs to introduce one auxiliary two-level particle to extract quantum information probabilistically with the fidelity unit if controllers cooperate with it.     

Critical Stage Rule-Based Real Time Dispatch（RTD）System in Highly-Mixed-Products （HMP） FAB

An improving utilization and efficiency of critical equipments in semiconductor wafer fabrication facilities are concerned. Semiconductor manufacturing FAB is one of the most complicated and cost sensitive environments. A good dispatching tool will make big difference in equipment utilization and FAB output as a whole. The equipment in this paper is In-Line DUV Scanner. There are many factors impacting utilization and output on this equipment group. In HMP environment one of the issues is changing of reticule in this area and idle counts due to load unbalance between equipments. Here we'll introduce a rule-based RTD system which aiming at decreasing the number of recipe change and idle counts among a group of scanner equipment in a high-mixed-products FAB.     

Diode-end-pumped Nd:YVO4/LBO lasers with 4.2W continuous-wave output at 457 nm

A continuous-wave (CW) 457 nm blue laser operating at the power of 4.2 W is demonstrated by using a fiber coupled laser diode module pumped Nd: YVO4 and using LBO as the intra-cavity SHG crystal With the optimization of laser cavity and crystal parameters, the laser operates at a very high efficiency. When the pumping power is about 31 W, the output at 457nm reaches 4.2 W, and the optical to optical conversion efficiency is about 13.5% accordingly. The stability of the out putpower is better than 1.2% for 8 h continuously working.