共查询到20条相似文献,搜索用时 140 毫秒
1.
2.
3.
金刚石具有极高的硬度 ,被用来制作工具时非常适宜加工硬而脆的难加工材料。采用电镀法制备金刚石工具有很多优点 :可以得到各种复杂形状、精度很高的工具 ;制造温度低 ,避免了对金刚石的热损失 ;工艺简便 ,设备投资少 ,制造周期短 ,成型方便 ,可以修复等等。目前 ,电镀金刚石制品已有各种砂轮、磨头、什锦锉、掏料刀、修正滚轮、地质钻头、扩孔器、内外圆切割片、绞刀、线锯等专用工具 ,广泛用于机械、电子、地质钻探、建筑业等。电镀法制备金刚石工具是通过金属的电沉积 ,将松散的金刚石颗粒固结在电镀层中 ,使金刚石颗粒具有切削能力。电… 相似文献
4.
介绍了两种类型固结金刚石线锯:树脂粘结的PWS-R型和电镀的PWS-E型,且均为多线锯锯床进行高效率和高精确度锯切而研发的.对这两种线锯进行了锯切单晶硅和蓝宝石晶棒试验以评估其性能.证实了这两种线锯比通常的游离磨料型线锯锯切具有高得多的效率.特别是PWS-E型线锯在锯切效率方面具有优越性,而PWS-R型线锯对晶片的损伤较少. 相似文献
5.
探讨金刚石线锯的技术问题,包括母线的材质、规格、强度、连接方法和结构形式;金刚石磨料的拉度、某些物理特性以及金刚石磨料在母线上的电镀固着方法和树脂粘结法及其改进措施.文章还提出了有待探索研究的课题,包括复合固着法、母线精细喷砂处理、金刚石磨料表面织构化处理以及微水刀激光技术应用于晶片切割的可行性. 相似文献
6.
7.
金刚石电沉积绞合线锯的开发 总被引:2,自引:0,他引:2
目前在集成电路基底用硅片制造中,切割工序采用磨粒悬浊液的多线锯切正在成为主流.但是,多线锯切存在切割性能受悬浊液供应状态的影响、加工效率低下、加工精度不佳等问题.因此,为了提高作为下一代切割加工法而引人注目的金刚石电沉积线锯的效率和使用寿命,研究开发出芯线为绞合线的金刚石线锯,并介绍该线锯的制作方法及其切割性能. 相似文献
8.
9.
10.
11.
乙烯酮(双乙烯酮)是十分重要的化工中间体,其下游产品较多。江苏某化工厂开发生产乙烯酮(双乙烯酮)下游产品三十多个,年生产规模三万多吨,是国内以乙烯酮(双乙烯酮)为中间体生产精细化学品的综合骨干企业。针对乙烯酮(双乙烯酮)下游产品废水特点,该厂结合企业实际,开展了产品优化,结构调整,清洁生产,资源循环利用,节水降耗等工作,从源头削减了污染物的生产。同时投资二千多万元新建预处理装置三套,6000m3/d废水生化处理装置一套,使全厂乙烯酮(双乙烯酮)下游产品的废水得到了有效的治理。 相似文献
13.
14.
D. G. Gordeev L. F. Gudarenko M. V. Zhernokletov V. G. Kudel’kin M. A. Mochalov 《Combustion, Explosion, and Shock Waves》2008,44(2):177-189
A semi-empirical equation of state for metals is described. Its capabilities are demonstrated by the example of the equation
of state for aluminum. New experimental data are presented on the location of the isentrope of aluminum for unloading from
the state at p = 229.71 GPa on the shock adiabat to an aerogel (SiO2) of density 0.08 g/cm3.
__________
Translated from Fizika Goreniya i Vzryva, Vol. 44, No. 2, pp. 61–75, March–April, 2008. 相似文献
15.
16.
17.
Jorge Marcelo Romero Soledad Bustillo Hugo Enrique Ramirez Maisuls Nelly Lidia Jorge Manuel Eduardo Gómez Vara Eduardo Alberto Castro Alicia H. Jubert 《International journal of molecular sciences》2007,8(7):688-694
A thermochemical rather simple experimental technique is applied to determine the enthalpy of formation of Diperoxide of ciclohexanone. The study is complemented with suitable theoretical calculations at the semiempirical and ab initio levels. A particular satisfactory agreement between both ways is found for the ab initio calculation at the 6–311G basis This set level. Some possible extensions of the present procedure are pointed out. 相似文献
18.
A perturbation viscometer is a differential capillary viscometer that measures the logarithmic viscosity gradient of the viscosity-composition curve for gas mixtures. Measurements are made at different gas mixture compositions. Integration of the logarithmic viscosity gradients measured over the full composition range gives the mixture viscosity relative to the viscosity of one of the pure components of the gas mixture. This method is attractive because, for measurements of equal precision, integration of the gradients is potentially an order of magnitude more precise than measurement of the viscosities directly. It can also work at high and low temperatures and perhaps high pressures.The perturbation viscometer has been used to make measurements on ideal gas mixtures at ambient and elevated temperatures. The situation is more complicated when the gas mixtures are non-ideal. Extra effects due to density differences, molar volume change on mixing and differential thermal expansion may be measured in addition to the desired viscosity change producing systematic errors in the results. Thus, a more sophisticated apparatus is required. The standard perturbation viscometer has been modified to separate out the extra effects to permit measurement of the true change in viscosity. In addition, the theoretical operation of the modified apparatus has been revised to account for the design changes to permit calculation of the viscosity-composition profiles from the results.The apparatus has been tested using helium-HFC-125 mixtures and two new viscosity-composition profiles are presented for these mixtures at 23 and . Internal consistency tests have been used to confirm that the data produced are of high quality with an estimated uncertainty in the viscosity ratio data at of 0.9% and at of 1.5%. 相似文献
19.
塔设备改造选型的分析 总被引:2,自引:0,他引:2
就当前扩产增容中塔设备设计和改造时板式塔和填料塔的选型问题加以分析。在评述目前国内常用的几种塔板和新型填料之后,着重介绍一种新型塔板(导向梯形浮阀塔板)和一种新型填料(波环填料——乾隆帕克)。 相似文献