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采用高氯酸?冰醋酸体系对镍钛合金管电解抛光.在温度25°C及抛光间隙15 mm的条件下研究了抛光时间(60~120 s)和电流密度(0.75~1.75 A/cm2)对抛光效果的影响.结果表明,随着抛光时间延长或电流密度增大,钛合金管的表面粗糙度先减小后增大,残余压应力先增大后减小,较佳的电流密度和抛光时间分别为1.15 A/cm2和90 s.在该条件下电解抛光后,镍钛合金管表面平整光亮,凹坑最少,表面粗糙度最小(为53.8 nm),表面残余压应力最大(为175.8 MPa). 相似文献
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微米级冰冻固结磨料抛光微晶玻璃的工艺研究 总被引:2,自引:2,他引:0
通过四因素三水平正交实验,对微米级冰冻固结磨料抛光微晶玻璃的工艺进行了研究.采用单位时间试样厚度变化表征抛光速度,以平均粗糙度表征抛光质量.获得了以优化抛光质量为目的的工艺参数:抛光压力:0.05 MPa;主轴转速:200 r/min;偏心距:105 mm;抛光时间:60 min.在该条件下获得了表面平均粗糙度为2.86 nm的超光滑表面,并且抛光速率为12.35 nm/min,并对抛光因素对表面质量和抛光速度的影响趋势进行了分析. 相似文献
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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
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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.
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Translated from Fizika Goreniya i Vzryva, Vol. 44, No. 2, pp. 61–75, March–April, 2008. 相似文献
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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
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醋酸纤维素取代基分布与性质的关系 总被引:9,自引:0,他引:9
分析了以吡啶为溶剂的醋酸纤维素的13C-NMR核磁共振谱,得出了三种不同位置羟基的取代度。结合X—射线和DSC分析,初步说明具有相同取代度但未经水解和经过水解的醋酸纤维素(CA) 性质上的差异是由于三个羟基上的取代度分布不同及消晶程度差异所致。 相似文献
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1 INTRODUCTIONBecause of importance of equations of state (EOS)in science and industry,hundreds forms of EOS havebeen presented since latter 19th century.It seems impossible to develop a general equation covering vari-ous kinds of EOS.But for cubic EOS,several generalequations have been reported already. Martin presented the first general equation whichis following p=RT/V-α(T)/(υ β)(υ γ) δ(T)/υ(υ β)(υ γ) (1) Kumar et a1.presented an equation called the most general form of a density-cubic or, alterna tively,volume-cubic mathematical equation,the form of which is as follows 相似文献
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