纳米ZnO掺杂压敏电阻电位梯度与显微组织研究

在制备ZnO压敏电阻的原料中加入纳米级ZnO粉料，研究了纳米级粉料对ZnO压敏电阻的压敏电位梯度的影响，并对其微观组织进行了分析研究，从理论上探讨了纳米ZnO影响ZnO压敏电阻压敏电位梯度与组织的机理．研究结果表明，压敏电阻中加入纳米ZnO后，其压敏电位梯度显著提高，纳米ZnO(质量分数)在0-30%的成分范围内，随着纳米ZnO含量的增加，ZnO压敏电阻的压敏电位梯度明显提高．其原因是纳米ZnO加入到ZnO压敏电阻中，使晶粒尺寸减小所致．     

双极性锌银贮备电池组电解液分配系统的研究

双极性锌银贮备电池组激活瞬间电解液分配的均一性,直接影响到电池组的电性能。与传统的单极性锌银贮备电池组相比,双极性锌银贮备电池具有许多优点。本文用优选进液垫片的方法改进双极性锌银贮备电池组电解液分配系统,确定合适的进液系统分配系数,组装实效电池组进行放电试验,改善了电池组的电性能。经实验与分析得出,用中心孔径为３．５ｍｍ的进液垫片粘在双极性片基上制成的电池组,放电性能最佳,它的分配系数λ值也正好接近经验数据１。     

氨性体系下新型添加剂对电积锌的影响研究

以自制的胺类衍生物为氨性体系电积锌的添加剂,考察其用量对电流效率和阴极锌表面形貌的影响。结果表明,在添加剂用量2mL/L、Zn2+浓度40g/L、氯化铵浓度5mol/L、氨水浓度2.5mol/L、电流密度400A/m2、异极距3cm、温度40℃的条件下,电流效率达到90.43%,阴极锌板表面形貌较为致密平整。     

大厂100号矿体矿化矿浮选的合理工艺

大厂１００号矿体富含锡、锌、铅、锑、银、铟、镉、金等元素,综合回收价值很高。采用优先混合浮选分离流程处理１００号矿体矿石,可有效回收有价矿物,与两段混合浮选分离流程相比,铅锑精矿中铅、锑品位分别３．２３和０．９６个百分点,铅、锑回收率分别提高１５．８０和１８．０２个百分点,相应银的回收率也较高;在回收率相近的情况下,锌品位和锡品位分别提高３．２０和３．２１个百分点。     

热壁外延ZnSe单晶薄膜

介绍了一种结构更加简单的热壁外延装置,以及用该装置在GaAs(100)面上生长ZnSe单晶外延层的工艺。扫描电镜和X射线衍射分析表明用该装置生长的ZnSe单晶外延层是比较理想的。     

S Zorb装置运行存在的问题及对策

中国石化镇海炼化分公司Ⅱ套S Zorb装置为0.90 Mt/a催化裂化汽油脱硫装置,2018年6月开工后,脱硫能力不足,吸附剂细粉含量大幅上升,系统吸附剂中硅酸锌含量异常升高,质量分数最高达15%,再生烟气过滤器压差快速上升,接近联锁报警值65 kPa,严重影响装置正常运行。通过长时间分析排查及验证,认为造成脱硫能力下降的原因一方面是吸附剂品质下降,另一方面是反应器流化状态不佳;吸附剂品质下降主要是待生吸附剂带烃较多造成的,通过吸附剂置换、降低待生吸附剂带烃量、改善反应器流化状态及调整循环速率和再生温度等一系列措施,装置的脱硫能力、细粉、硅酸锌含量及再生烟气过滤器压差逐步趋于正常。     

超细活性氧化锌在轿车子午线轮胎胎面胶中的应用

对超细活性氧化锌在轿车子一轮胎胎面胶中的活尼效果分两组配方做了实验。结果表明,超细活性氧化锌由于活性高、等效用量小,与普通氧化锌相比有加快硫化速度的效果,并能改善胶料的加工性能,提高硫化胶的扯断永久变形、耐老化性和耐疲劳性能;超细活性氧化锌胶料加入活性碳酸钙后,能胶料生产成本,提高经济效益。     

Zinc diffusion and extractability as affected by zinc carrier and soil chemical properties

This work was carried out to evaluate the effect of soil chemical properties, Zn carrier and time elapsed after fertilizer application on the diffusion and extractability of Zn. A soil block technique was used to study zinc diffusion and DTPA extractability from ZnEDTA and ZnSO₄ fertilizers in three soils that varied in texture, CaCO₃ content, organic matter content, and pH using Zn⁶⁵ tracer. ZnEDTA diffused readily in all soils, moving 20–25 mm from the fertilizer layer after three days. The rate of Zn diffusion and the extractability of Zn, however, varied among the soils and were lowest in Baha soil with the highest clay content, organic matter, and CEC despite its lower pH. The high pH and CaCO₃ content in Dirab soil did not restrict the diffusion or reduce the extractability of ZnEDTA in this soil. On the other hand, the diffusion of Zn from ZnSO₄ fertilizer was largely restricted in all soils and was confined to 5 mm from the fertilizer layer after 13 d. The extractability of ZnSO₄ fertilizer was largely affected by soil pH and CaCO₃ content and was lowest in Dirab calcareous soil. Organic matter amendment at 5% (as alfalfa) considerably reduced the diffusion and the extractability of ZnSO₄ in both Dirab calcareous and Bakyria noncalcareous soils. The application of 1% (w/w) elemental S reduced soil pH and increased Zn diffusion from ZnSO₄ fertilizer in Bakyria soil but had slight effect on Dirab calcareous soil.     

Grain Growth in Sintered ZnO and ZnO-Bi2O3 Ceramics

Grain growth in a high-purity ZnO and for the same ZnO with Bi₂O₃ additions from 0.5 to 4 wt% was studied for sintering from 900° to 1400°C in air. The results are discussed and compared with previous studies in terms of the phenomenological kinetic grain growth expression: G ⁿ— G ⁿ₀= K ₀ t exp(— Q/RT ). For the pure ZnO, the grain growth exponent or n value was observed to be 3 while the apparent activation energy was 224 ± 16 kJ/mol. These parameters substantiate the Gupta and Coble conclusion of a Zn²⁺ lattice diffusion mechanism. Additions of Bi₂O₃ to promote liquidphase sintering increased the ZnO grain size and the grain growth exponent to about 5, but reduced the apparent activation energy to about 150 kJ/mol, independent of Bi₂O₃ content. The preexponential term K ₀ was also independent of Bi₂O₃ content. It is concluded that the grain growth of ZnO in liquid-phase-sintered ZnO-Bi₂O₃ ceramics is controlled by the phase boundary reaction of the solid ZnO grains and the Bi₂O₃-rich liquid phase.     

Voltage-Current Characteristics of a Simple Zinc Oxide Varistor Containing Magnesia

This paper examines the effect of MgO addition on the structural and electrical characteristics of a ZnO varistor composition with few dopants. MgO acts as a grain-growth inhibitor. The electrical performances of the obtained varistors are improved.