钨系延期药燃烧温度场分析

采用热电偶测试温度的方法，研究了Ｗ系延期药的燃烧波温度随时间的分布情况，结果理论分析，证明了点火前和反应完全后燃烧波的温度随时间呈指数形式变化。     

煤矿许用毫秒延期电雷管研究

文中对影响煤矿许用毫秒延期电雷管沼气安全性与延期时间精度的因素进行了研究。应用正交设计研制了新的延期药配方，确定了合理的雷管结构及装配工艺参数，产品性能达到ＧＢ８０３１《工业电雷管》的规定。     

延期药延期时间的p-t曲线测试新方法

利用测压组件、高压电弧点火器、压力变送器、示波器等建立了一种新型的、适用于延期药燃速测试的p-t曲线测试系统。利用高压电弧点火器在金属针与延期体金属管壳间产生电弧，点燃延期体；用示波器记录燃烧过程中测压组件内部的p-t曲线，通过适当的取点，得到延期药的燃烧时间。分别用p-t曲线法和光电法测试了秒级及毫秒级延期体的延期时间，并对所得结果进行了对比。对于秒级延期体，光电法、p-t曲线法测试后计算得到的延期精度分别为3.35%、3.43%；对于毫秒级延期体，光电法、p-t曲线法测试后计算得到的延期精度分别为12.21%、18.96%。结果表明:该p-t曲线测试系统应用于秒级、毫秒级延期药延期时间的测试是可行的，体现延期体的真实燃烧状态，满足高低温下延期体测试的保温需求。     

某型延时起爆装置延期时间影响因素的研究

为实现某型延时起爆装置预定的延期时间，选用点火药硼/硝酸钾作为毫秒级延期药，通过对延期药原材料及装药结构的分析，尽可能地控制延期时间精度。主要针对延期药的原材料、装药密度、壳体材料、装药结构以及装药条件等对延期时间影响的机理及试验对比进行分析。经研究发现，延期药的延期时间和延期精度受诸多因素影响，一般来说药剂粒度适中且颗粒均匀，或提高装药压力，延期时间精度较高。其他因素（如装药壳体、装药结构、环境条件等）在不同程度上对延期时间精度也有影响，减少这些因素的影响对提高延期时间精度是十分必要的。     

起爆药压药密度对延期时间的影响

起爆药压药密度对延期时间的影响如何提高和控制毫秒雷管延期时间精度，是生产中的一大难题。由于影响延期时间的因素比较多，不可能使产品的所有条件都能达到相同，这样，延期时间就会出现误差。在实际操作中，当起爆药压药密度超出一定范围后，对延期时间精度有很大的影...     

铅丹－硅制延期体生产与贮存中秒量的稳定性探讨

文章通过对延期药、延期体已存秒量进行的一系列生产试验和分析，得出了其秒量变化的实验结论．     

远红外辐射加热技术在延期药脱水干燥工艺中的应用

远红外辐射加热技术在延期药脱水干燥工艺中的应用云南燃料一厂李富良目前，大多数火工品厂在延期药的烘干方法上，基本上都采用蒸汽加热干燥的方式，存在干燥效率低（工艺规定干燥时间７２ｈ）、加热烘干的环境条件差，降温脱水比较困难、烘干温度高及所需的时间还决定于...     

延期药技术综述

该文综合评述了国内外毫秒、秒延期药技术的简史、现状和发展。根据国外的先进经验 ,结合我国的实际情况 ,提出一些延期药技术的具体研究和发展思路 ,以提高我国延期产品的质量 ,缩短和发达国家的差距。     

硅系延期药生产工艺的优选

文章针对硅系延期药生产工艺在半秒延期电雷管中应用时遇到的问题，分别从延期药配方的选择，硅加工工艺，混药工艺及筛药次数等进行优选，找到了解决问题的方法。     

Si对Pb3O4-Si-Cy延期精度的影响

文中讨论了硅对一种新的硅系延期药（Pb3O4-Si-Cy）延期精度的影响。实验发现,随着硅比表面积的增大,该延期药燃速变慢;硅的加工生产方法和产地不同,使延期药的燃速和延期精度也不同。因此认为,生产这种毫秒延期药时要慎重选择原料,控制爆破作业中切不可在同一爆破网路中使用不同规格硅生产的延期雷管,以防造成串段问题。     

A Study of the Influence of Phase Composition of Cutting Inserts Made of Diamond–Tungsten Carbide Nanocomposite on the Process of Finish Turning of Aluminum Alloys and Brass

The effect of phase composition of cutting inserts made of diamond–tungsten carbide nanocomposite on cutting forces, friction coefficient in the cutting zone, and acoustic emission signal in finish turning of aluminum alloys and brass has been studied. It has been found out that the amount of 30 to 40 wt % tungsten in the initial mixture ensures sintering of a tool composite with the most favorable phase composition for turning aluminum alloys and brass.     

Sol-gel/co-precipitation method for the preparation and characterization of zirconia-tungsten composite powders

Sol-gel and co-precipitation are interesting processes in view to prepare ceramic-metal composite powder. Using metal salts as starting compounds it is possible in a first step to synthetise a mixed precipitate and in a second reduction step, in a H₂/Ar atmosphere, to obtain such a composite powder. Stabilized zirconia-tungsten composite powder have been prepared by this way without mixing and milling steps. Each step of the synthesis has been characterized. Stability of the mixed precipitate suspension and surface area of the dried powder are largely influenced by the tungsten salts content. The temperature of formation of zirconia changes from 510 °C without tungsten precursor up to 695 °C for a 60% tungsten molar ratio composition. Composite zirconia-tungsten powders, in a large range of composition, are obtained at 1100 °C with morphologies depending on humidity and thermal treatment conditions.     

电磁场作用下原位生成WC颗粒机理的研究

为了提高灰口铸铁的耐磨性,用施加电磁场的方法,在灰口铸铁熔体中原位合成了WC颗粒,采用X射线衍射仪、扫描电子显微镜、能谱分析仪研究了合成产物的物相、显微组织以及化学成分.实验结果表明:提高电磁频率有助于WC颗粒的原位合成,当电磁频率5kHz、电流为15A、作用时间为5min时,可得到细小,且分散性较好的颗粒.主要是电磁场的存在,降低了钨丝的表面张力,使钨原子容易从表面脱附,同时提高了钨丝附近的Fe-W-C三元体系微小区域的混合熵,引起了生成WC颗粒的自由能降低,从而利于WC颗粒的合成.     

Preparation of Tungsten Carbide Nanopowders by Self-propagating High-Temperature Synthesis

Fine-particle tungsten carbide powders are produced from tungsten(VI) oxide by self-propagating high-temperature synthesis. The starting-mixture composition is shown to have a significant effect on the phase composition, morphology, and particle size of the WC powder. A procedure is described for recovering tungsten carbide from intermediate products using chemical dispersion. The influence of the dispersion agent on the morphology and particle size of the resultant powder is examined. The results indicate that the use of organic solvents for chemical dispersion prevents the formation of solid agglomerates, enhances the dissolution rate of impurities and defect-rich intercrystalline layers, and makes it possible to obtain tungsten carbide powders with a predominant particle size no greater than 0.05–0.2 m.     

Preparation of WC and W2C by self-propagating high-temperature synthesis using a mixture of tungsten,titanium, and carbon black powders

Tungsten carbide and titanium carbide powders have been prepared from a mixture of tungsten, titanium, and carbon black by self-propagating high-temperature synthesis after mechanochemical processing. Conditions for the synthesis of the WC and W₂C carbides have been found, and the yield of the tungsten carbides has been shown to depend significantly on the composition of the tungsten + titanium + carbon black mixture and milling time.     

小电流高频TIG焊电弧稳定性的研究

本文以大量的试验结果表明了电流频率、钨极尺寸和保护气体成分等对小电流 TIG 焊电弧稳定性的影响规律。并得出6～8A 小电流时的电弧稳定性条件是采用20KHz 以上的高频电流。(Ar+2%H_2)混合气体保护和直径为φ0.5mm 的细铈钨极。     

含Fe2O3组分钨系延期药的研究及应用

文章介绍了一种含Ｆｅ２Ｏ３组分钨系延期药，对影响该延期药燃速的因素进行了实验研究，并应用于导爆管雷管中，取得了良好的效果。     

On the nature of the surface phases formed on carbidized tungsten during field evaporation

It is it is shown by means of an atom probe that the subsurface regions of a carbonized tungsten tip (the so-called terraced crystal) has the composition of tungsten carbides which are enriched with carbon as compared to WC. The properties of the nonequilibrium surface phases formed as a result of anisotropic field evaporation of the crystal are elucidated, and the mechanisms by which these phases relax to the equilibrium state are discussed. Pis’ma Zh. Tekh. Fiz. 24, 45–52 (June 12, 1998)     

Electrochemical synthesis of nickel (cobalt)—molybdenum (tungsten) intermetallic compounds

We study the electrochemical behavior of nickel and cobalt in tungstate melts and the influence of the conditions of electrolysis on the composition and structure of deposits of nickel (cobalt)—molybdenum (tungsten) alloys and intermetallic compounds in oxide-tungstate melts. It is shown that, as the concentration of molybdenum (tungsten) in the melt increases and the concentration of nickel (cobalt) decreases, the phase composition of cathodic deposits includes nickel, cobalt, alloys and intermetallic compounds of nickel and cobalt with molybdenum and tungsten, molybdenum, and tungsten. __________ Translated from Fizyko-Khimichna Mekhanika Materialiv, Vol. 41, No. 5, pp. 61–68, September–October, 2005.     

Effect of transition elements on the properties of MC carbides in IN-100 nickel-based superalloy

The effect of nine transition elements on the morphology, distribution and composition of MC carbides (MCs) in a nickel-base superalloy, IN-100, was investigated by differential thermal analysis (DTA), microstructural observation and X-ray microanalysis. The doping with tantalum, tungsten and molybdenum caused a significant change in the morphology and distribution of MCs as well as the profile of DTA curve of IN-100. The compositions of the MC in IN-100 were TiC and (Ti_0.80Mo_0.17V_0.03) C, and the doping with niobium, tantalum and tungsten changed significantly the composition of MC. On the other hand, the doping with chromium, vanadium, hafnium and zirconium scarcely changed the composition. In addition to TiC and (Ti, Mo, V) C, zirconium- and hafnium-rich MCs were found in the zirconium- and hafnium-doped alloys, respectively. The effect of the dopants on the composition of MCs could be explained by a relationship between the metallic radius and the free energy of formation for the MC.