金刚石薄膜异质外延的研究进展

主要介绍金刚石薄膜在Si上异质外延的研究状况。综述了外延金刚石薄膜的偏压形核 ,SiC过渡层的影响及一些实验参数对外延薄膜质量的影响等 ,并论述了发展方向     

高可靠镀Ni／Au工艺及其在微波PTFE电路上的应用

介绍了高可靠电镀Ｎｉ／Ａｕ工艺在ＰＴＦＥ微波印制电路上的应用，并分析了氨基磺酸盐镀软镍和亚硫酸盐镀软金工艺的影响因素及提高Ｎｉ／Ａｕ镀层之间附着力的措施。通过实验及应用证明了与直接镀金工艺相比，在软基材ＰＴＦＥ敷铜箔板上镀Ｎｉ／Ａｕ工艺能大大提高微波电路的可焊性，高温稳定性和长期可靠性，并且用其所制作的微波器件的高频性能也优于直接镀金工业。     

高功率激光焊接光致等离子体的检测

系统地归纳了高功率激光焊接过程中光致等离子体的声、光、电、热等四种特征信号，综述了国外在等离子体信号检测方面的试验方法及研究进展，分析了未来的发展趋势     

Combination of coating and heat treatment processes

For a proper use of coated tools and components excellent coating properties as well as excellent substrate properties of the coating/substrate composite are necessary. A well known example is the load support of hard steel substrates for thin wear resistant coatings. Therefore coating processes must be combined with heat treatment processes of the substrates, whereby several practical processing constraints like order and compatibility of the applied treatment procedures must be considered. The combination of CVD-coating plus laser beam hardening is an example of a post coating heat treatment. Applications may be possible for large forming tools made of high alloyed tool steels, which nowadays are usually through hardened after CVD-coating. Laser beam hardening offers the possibility, to harden only the highly loaded edges of the tools. The advantages of this combination are short process time, less distortion and compressive residual stresses in the substrate surface. CVD-coatings can endure laser beam hardening with suitable parameters. The influence of CVD TiN-coated steel substrates and laser beam hardening parameters on microstructures and properties of coating/substrate compounds have been investigated. Special attention was paid to overlapping hardening zones, which may occur at the start and end points of a laser hardened track. In summary, the combination of coating and heat treatment processes show a high potential to produce coating/substrate compounds with excellent coating properties as well as excellent substrate properties.     

Plasma Discharge Initiation of Explosives in Rock Blasting Application： A Case Study

A plasma discharge initiation system for the explosive volumetric combustion charge was designed, investigated and developed for practical application. Laboratory scale experiments were carried out before conducting the large scale field tests. The resultant explosions gave rise to less noise, insignificant seismic vibrations and good specific explosive consumption for rock blasting. Importantly, the technique was found to be safe and environmentally friendly.     

指状椭圆函数滤波器的研究与设计

阐述了指状椭圆函数滤波器的特点、适用范围，基本理论以及设计方法。用本文导出的公式进行设计有工程应用价值，介绍了一个L波段滤波器的例子。     

新型微波-毫米波幅相测试系统及扩展应用

介绍了一种新型微波 毫米波幅相测试系统及其在相关测试领域中的典型应用。与传统微波幅相测试系统相比 ,该系统具有原理新颖、结构简单、扩展频段容易和使用方便等优点。本系统目前广泛应用于紧缩场电气性能检测、天线测量和RCS测量等领域中 ,频率范围为 1～ 110GHz。本测试系统已经申请国家专利 ,并通过相关部门鉴定。     

导电聚苯胺在微波场中的升温特性

本文研究了微波辐照下导电聚苯胺的升温特性。研究表明 ,导电聚苯胺在微波场中具有快速升温的特点 ,升温速度与掺杂剂的种类、掺杂酸的浓度、聚苯胺的导电率、合成聚苯胺的温度等因素有关。盐酸掺杂聚苯胺热稳定性较差 ,在微波场中不能反复升温 ,而热稳定性较好的DBSA掺杂的聚苯胺具有一定的反复升温能力     

微波复合介质基板性能研究

采用微扰法、螺旋圆柱谐振法和带状线谐振法分别对聚四氟树脂复合精细电子陶瓷微波复合介质的复介电常数进行了测量与误差分析。基于扫描电子显微镜 (SEM )观察 ,从微观上解释了辊压工艺对介质介电性能一致性改善的原因。研究了不同的表面处理方法对基板金属化剥离强度的影响规律。     

Hybrid gas-to-particle conversion and chemical vapor deposition for the production of porous alumina films

Porous alumina films can be found in a wide variety of materials, including filters, thermal insulation components, dielectrics, biomedical and catalyst supports, coatings and adsorbents. Production methods for these films are as equally diverse as their applications. In this work, a hybrid process based upon chemical vapor deposition and gas-to-particle conversion is presented as an alternative technique for producing porous alumina films, with the main advantages of solvent-free, low substrate-temperature operation. In this process, nanoparticles were produced in the vapor phase by reaction of aluminum acetylacetonate in the presence of oxygen. Downstream of this reaction zone, these nanoparticles were collected via thermophoresis onto a cooled substrate, forming a porous film. Some deposited films were subjected to post-processing in the form of annealing in air. Fourier-transform infrared spectra and X-ray energy-dispersive spectroscopy analysis confirmed the production of alumina at processing temperatures above 973 K. X-Ray diffraction revealed that the films were amorphous. Film thickness, ranging from 30 to 250 μm, and the average deposition rate were determined from scanning electron microscopy results. From transmission electron microscopy, the average primary particle size was determined to be approximately 18 nm and the formation of nanoparticle aggregates was evident. Annealing of the films at temperatures ranging from 523 to 1173 K in the presence of air did not have an effect on particle size. The specific surface area of the powder composing the films ranged from 10 to 185 m² g⁻¹, as determined from nitrogen gas adsorption by the Brunauer–Emmett–Teller method.