针对PID的多晶硅太阳电池片减反射膜研究

本文针对多晶硅太阳电池的电势诱导衰减(PID)现象,通过开发高折射率电池镀膜工艺,把改变双层减反射膜的折射率作为重点调试的工艺参数,调节镀膜时的Si H4:NH3比例,同时对膜厚进行适当的调整,最终使电池片的光电转换效率稳定在17.7%以上,组件经PID测试峰值功率衰减小于5%,达到抗PID要求。     

多晶硅还原炉倒棒原因分析

还原炉倒棒一直是困扰各多晶硅厂的一个难题,长期倒棒现象将给生产设备造成损坏,甚至可能造成意外事故及人身伤害。通过对多晶硅生产中还原炉倒棒现象的总结分析,提出导致倒棒的主要原因和预防措施。     

氢化炉C-C发热体使用寿命的研究

在多晶硅生产氢化工序中,在相同的工况下,对德国MSA公司C-C复合发热体和国内生产的C-C复合发热体的使用现象、寿命等方面的对比,总结出了影响氢化炉中C-C复合加热体使用寿命的主要因素,经实践验证国产C-C复合发热体完全可以满足多晶硅生产的使用要求。     

利用多晶硅切削废料制备硅溶胶的研究

为实现多晶硅废料的绿色高效回收利用,以多晶硅切削废料为硅源,通过水解法制备硅溶胶.探讨了不同碱性水解剂的水解性能,并系统地研究了硅溶胶的最佳合成工艺.实验结果表明:以浓度为1.36 mol/L的氨水为水解剂,氨水溶液和多晶硅废料的质量比为240∶1时,经150℃水热处理5h,能够得到近球形形貌、平均粒径约为80 nm左右的硅溶胶,静置10d,未发生凝胶现象,表现出良好的稳定性.为多晶硅废料的资源再利用提供了一种可行性路线.     

氢气压缩机对多晶硅质量影响及改进方法

近年来太阳能行业的快速发展带动太阳能级多晶硅行业高速增长,我国太阳能级多晶硅产业进入了一个发展平台期。价格大幅回落让多晶硅产业告别了暴利时代,因为多晶硅生产的高能耗、产能过剩、四氯化硅处理困难等原因,国家出台了一系列准入制度,抬高了多晶硅生产的准入门槛。多晶硅利润不断被压缩,多晶硅企业之间从产能之争慢慢转变为质量竞争。因此多晶硅产品的质量好坏直接决定了企业的命运,如何提高多晶硅质量成为业内关注的焦点。本文在氢气压缩机对多晶硅质量影响方面进行探讨,并给出几点改进意见。     

GBS（吉必盛）实现四氯化硅转产白炭黑促进多晶硅行业发展

多晶硅是集成电路和光伏发电用关键原材料，随着国内外多晶硅市场需求的高速增长，我国多晶硅生产规模迅速扩大，今年以来全国各地有十几个多晶硅项目宣布动工或投产。随着我国多晶硅总产量的逐年增多，多晶硅生产过程中产生的副产物四氯化硅的安全和环保问题日益突出，多晶硅副产物的利用成为我国多晶硅行业节能减排、清洁生产和可持续发展的重要环节，     

利用多晶硅副产物制备氯化钡的研究

随着中国多晶硅产业的发展,多晶硅副产物的环境污染问题日益突出,将多晶硅副产物无害化和资源化迫在眉捷.研究了利用多晶硅副产物制备氯化钡的影响因素,得到优化工艺条件.实验结果表明:利用多晶硅副产物制备氯化钡是可行的;该方法有助于解决多晶硅副产物的环境污染问题,可大幅度降低多晶硅的生产成本,极大地提高企业的经济效益,对发展中国多晶硅和太阳能产业具有十分重要的意义.     

多晶硅还原工段余热回收

多晶硅还原工段占多晶硅成本18%~25%,对还原系统的能量消耗进行分析,进行余热回收,为多晶硅生产工厂和多晶硅工艺设计提供参考。     

多晶硅中杂质含量、分布及其检测方法的探讨

多晶硅中杂质的组成及含量是衡量多晶硅产品质量的重要指标之一,由于其杂质组成复杂、含量低于常规检测方法检出限,这就使对多晶硅中杂质含量、分布及检测方法的研究具有重要意义。概述了目前用于检测分析多晶硅中杂质含量、分布的方法及其优缺点;总结了近年来国内外在多晶硅杂质检测方法研究中的进展以及多晶硅中杂质的含量和分布数据,为多晶硅的检测提供了参考。     

多晶硅生产中质量意识的培养

近年来,随着国外多晶硅大规模的对中国市场进行倾销,使得中国市场被大规格的抢占,这导致我国的多晶硅市场面临着严峻的挑战。虽然目前我国的多晶硅质量有了显著的提高,但是大部分的多晶硅在品质上和纯度上都不稳定,且低于国外企业。为此,多晶硅生产中质量意识的培养显得尤为重要。对国内多晶硅企业在质量意识培养时所面临的困难进行阐述,并提出多晶硅生产中质量意识的培养策略,以期提高我国多晶硅生产的质量。     

COMPARISON OF METHODS OF ANALYSIS OF GYPSUM1

The different analytical methods proposed for the evaluation of gypsum have been subjected to an experimental test. A combination method, consisting of a fusion with KHCO₃ and determination of CaO by KMnO₄ titration, the SO₃ by Andrews method of titration of BaCrO₄ has been found to give very reliable results with the least consumption of time.     

氢气纯度分析方法准确性的探讨

ONACCURACYOFANALYSISOFOFHYDROGEN1前言我公司目前应用的氢气纯度分析方法有两种,一种是爆炸反应法,另一种是焦性没食子酸吸收法。几年来,人们对两种分析方法的准确性曾有过褒贬不一的评论。这里我们也谈谈自己粗浅的观点。2爆炸法测定氢气纯度一定量的氢气样品与适量的空气之均匀混合物因反应后生成液体水而引起气体体积减少,减少的体积等于参加反应气体体积之和。其中l／3为氧气,2／3为氢气。根据氢气取样量和反应前后混气体体积之差,以及氢气在反应中的体积比例关系,可计算出样品的氢气纯度。计算公式式中：A一混…     

HEASUREHENT OF INSTANTANEOUS RATES OF LOSS OF VOIATILE COMPOUNDS DURING DRYING OF DROPS

A novel technique serves to monitor instantaneous rates of loss of a volatile solute from a suspended drop during drying. A highly sensitive electron capture detector is used to monitor concentrations of SF6 released into a flowing gas stream from a suspended, drying drop. Simultaneously, the appearance and morphological development of the drop are monitored with a video camera. This provides the wherewithal of relating instantaneous rates of loss of the volatile solute to particular events during the development of particle morphology.

Initial experiments have been carried out with drops of aqueous solutions of glucose, sucrose, maltodextrin and coffee extract. The results clearly display the onset of the volatiles-retentive selective diffusion phenomenon. There is also substantial loss of the volatile component later in the drying process, when the drops undergo repeated ex ansion, bursting and cratering due to the formation of internaf bubbles. These experiments appear to be the first quantitative demonstration of major losses accompanying changes in drop morphology.     

SEDIMENTATION OF BINARY MIXTURES OF PARTICLES OF UNEQUAL DENSITIES AND OF DIFFERENT SIZES

A model is developed for the sedimentation from a suspension of two particle species of unequal densities and of different sizes. The composition and the thickness of various layers in the sediments are predicted using graphical and analytical methods. The model predictions were in excellent agreement with experimental results, when the particle size ratio was ≥ 108. When size ratio of the particles was 2.60 and 4.31 the agreement occurred in about 50 percent of the cases.     

茶多酚提取方法进展

本文综述了国内外现有茶多酚提取方法的现状以及近期的研究进展，并对其优缺点进行了评价。这将有助于中低档茶的综合利用和茶多酚的进一步开发应用。     

ANALYSIS OF RECENT MEASUREMENTS OF THE VISCOSITY OF GLASSES

Viscosity of Simple Soda-Silicate 500° to 1400°C Comparison of the results given by English with those of Washburn, Shelton and Libman, indicates a discrepancy in the absolute values of log₁₀ viscosity amounting to 0.6, those of Washburn et al., being relatively too high. If correction for this is made, the isothermal curves of log₁₀ viscosity as a function of soda content are smooth up to 50% Na₂O, showing no inflection. The observations as a function of temperature T are all represented within accidental error by an equation of the type where all three constants vary regularly with the composition. Change of Viscosity of Glass (6SiO₂, 2Na₂O) due to Molecular Substitution of CaO, MgO and Al₂O₃ for Na₂O The effect is clearly brought out by plotting (from the results of English) the change of log₁₀η due to the substitution as a function of temperature. The curves each show a sharp bend at a temperature between 840° and 1050°C, which is designated the aggregation temperature T_a. If we divide these curves by the corresponding percentage substituted, we get curves for each oxide which are straight and parallel below the aggregation temperatures, the slopes (increase of change of log₁₀η per 100°C) being −0.056 (CaO), −0.055 (MgO), −0.018 (A1₂O₃) per per cent oxide substituted. For substitution of 1/2 molecule the slopes are −0.325 (CaO), −0.23 (MgO) and −0.18 (Al₂O₃) per 100°. At the aggregation temperature the change of log₁₀η per per cent is a minimum, 0.03 to 0.06 for CaO, 0.12 for MgO, 0.07 for Al₂O₃. Evidence of Aggregation in Glasses, from viscosity Measurements The sharp bends in the plots of change of log₁₀η due to substitution of an oxide for Na₂O, suggest the beginning of molecular aggregation at these temperatures. These aggregation temperatures are close to the devitrification temperatures, but the effect on the viscosity curves cannot be due to actual devitrification since it does not change with time. Taking the aggregation temperatures as equal to devitrification temperatures, additional isotherms are roughly sketched into the equilibrium triangle of the system Na₂O-CaO-SiO₂. Change of Viscosity of Glass (4SiO₂, 2Na₂O) due to of Substitution of B₂O₃ for SiO₂ The change of log₁₀η (from the results of English) is plotted as a function of temperature, and also the change of log₁₀η per per cent B₂O₃. The curves are more complex than for the substitution for Na₂O.     

环氧树脂羟基值测定方法的研究

利用乙酸酐、吡啶和浓硫酸混合的乙酰化试剂测定环氧树脂中羟基值含量的方法具有操作简便、滴定终点明显和分析结果误差小等优点。     

骑式摩托车油箱喷涂工艺的改进

面对日益激烈的市场竞争,摩托车油箱外观质量越来越成为影响销售的因素之一。文章介绍了改进工艺后的油箱涂装,该涂装体系提高了油箱外观的丰满度,降低了油箱涂装的生产成本。     

几种针状焦性能对比

针状焦分石油系和煤系两大类,这主要取决于针状焦的原料来源。在同一系列中由于原料不同和工艺条件不同 ,针状焦的各自性能也不相同。针状焦是生产超高功率石墨电极和高功率石墨电极的主要原料 ,针状焦的性能对石墨电极的质量有至关重要的影响。所以对针状焦性能以及其对石墨电极质量影响的研究十分必要的。以下是常用的几种进口针状焦和国产针状焦的性能对比。１原料性能分析对比原料试样包括４种针状焦 ,其中两种为进口针状焦：三菱针状焦和新日化针状焦;另两种为国产针状焦：鞍山针状焦和锦州针状焦。其中除锦州针状焦是石油系针状焦外…     

用两个形状指数表征粉煤灰颗粒形貌的研究

引用两个形状指数表征颗粒形状的概念,即先将颗粒形状近似为椭圆,再将椭圆图像分离:以圆为基准的颗粒宏观形状指数δ;以光滑椭圆为基准的颗粒轮廓凹凸度,即微观形状指数ζ。分析和发展了近似椭圆模型。并运用图像分析仪对粉煤灰、水泥样品进行实验。结果表明,粉煤灰颗粒的两个形状指数δ和ζ都大于水泥颗粒。证明粉煤灰颗粒的球形度、表面光滑度优于水泥,而且,随着粒径增大,δ和ζ呈下降趋势,表明磨制颗粒越粗。(?)粒形状越不规则。文中还运用近似椭圆模型再现了颗粒的模拟图像。