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在化学机械研磨过程中,对半导体硅片的质量影响因素主要有研磨工艺(研磨盘压力、转速、浆料流量等)和化学机械研磨液的成分。本论文重点研究了化学机械研磨浆料的成分对硅片表面粗糙度、总厚度偏差(TTV)、拉丝、划道擦伤、清洁度的影响。通过实验可知:研磨浆料组成为:1%AEO_7;2%聚乙烯吡咯烷酮PVP K90;0.4%乙二胺四乙酸;2%四羟乙基乙二胺;20%PWA 10;74.6%高纯水,可以得到优异的研磨硅片质量。 相似文献
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预焙阳极约含50~65%石油焦、14~17%煤焦油沥青和15~30%残极返回料。众所周知,残极的数量和清洁度影响阳极的物理性能,如机械强度和空气渗透率,以及羟基反应性。最近的研究工作表明,残极的硬度对预焙阳极物理性能和空气反应性有很大影响。 相似文献
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<正> 一、概 论 矿物油的含水量与污染状态的严格控制,是保证油液工作性能的极为重要的参数之一,也是提高工业产品或自动化系统可靠性的重要保证。如500KVA变压器要求油的含水量≤10ppm,清洁度在NAS6级以上;冷冻机油的含水量,美国标准要求≤20ppm,清洁度在NAS6级;液压油的含水量≤300ppm,清洁度在NAS7级。许多用户为保证加入系统的油达到指标,采用了真空脱水,静电净油,以及高精度机械式过滤系统对油进行预处理。然而,用户们担心经过处理的油,是否已达到指标,心中无数,因为:目 相似文献
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由于胶接比机械连接具有更多的优点,所以它在各工业部门的应用日益增多。影响胶接强度的因素很多,如:胶粘剂(分子结构、粘度、浸润性、胶层厚度、刚度、收缩率、内应力等)、被胶接件(表面粗糙度、清洁度、被胶接件的刚度等)、胶接工艺(固化温度、时间、压力等)、载荷方向等 相似文献
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作为与国家经济安全和国防安全密切相关的能源和基础原材料产业,石油石化行业落实科学发展观十分必要和重要。始终坚持有效发展的原则、努力提高发展的经济效益和竞争力,把合理开发和节约资源放在首位、带头建设节约型社会,努力实现生产清洁化和产品清洁化、积极促进循环经济的发展,重视企业的社会责任、强化企业的无形竞争力,是石油石化行业落实科学发展观的必由之路。 相似文献
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针对我国的燃料资源特点以及改善干燥工艺经济性的需求,开发了一种以原煤为燃料的直接式干燥介质发生系统。该系统通过机械化给煤、区域控温、多次进风等技术手段实现原煤的脱硫和稳定、高效、高温燃烧,通过多级旋涡凝聚式高温烟气除尘装置实现烟气的净化,通过控温、混风、配风最终得到温度和风量大幅度精确可调的高洁净度干燥介质。与其他干燥介质发生系统相比,该系统可以使生产成本下降20%~50%,可以有效地控制干燥介质中烟尘和硫化物含量,可以用于对纯净度没有过高要求的各种干燥工艺过程。介绍了这种干燥介质发生系统的工艺原理、应用效果、适用领域和发展前景。 相似文献
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液压润滑管道系统开车前必须进行化学清洗,需建立完善的清洗工艺,选择效果优良的清洗剂,并进行循环油冲洗,以达到所需的清洁度。 相似文献
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L Imre Associate Professor 《Drying Technology》2013,31(4):503-512
Precondition of the successful application of Solar drying is the economy mainly influenced by the savings and the costs. Components of savings and costs are related to the design of the solar dryer and the drying technology to be performed. Analysis of relations between the technical solutions and the economy is presented with regard to some often neglected or undervaluated effects, i.e. savings obtained by the absolute cleanness of solar energy, quality of the dried product and, the energy effectiveness of the drying process itself. Conclusions of- fer some contributions of principle to the selection of the system of solar dryer to be used, to design of solar dryers and, to direction of the drying technology 131. 相似文献
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L. Imre Associate Professor 《Drying Technology》1986,4(4):503-512
Precondition of the successful application of Solar drying is the economy mainly influenced by the savings and the costs. Components of savings and costs are related to the design of the solar dryer and the drying technology to be performed. Analysis of relations between the technical solutions and the economy is presented with regard to some often neglected or undervaluated effects, i.e. savings obtained by the absolute cleanness of solar energy, quality of the dried product and, the energy effectiveness of the drying process itself. Conclusions of- fer some contributions of principle to the selection of the system of solar dryer to be used, to design of solar dryers and, to direction of the drying technology 131. 相似文献
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Byoung-Uk Cho Jeong-Yong Ryu Bong-Keun Song 《Journal of Industrial and Engineering Chemistry》2009,15(2):196-201
In order to design a flotation circuit to remove ink and contaminants from slushed old corrugated container (OCC) pulp suspension, a model based on mass balance was developed. The model is a five fractional model, which handles mass flow rate of ink, fiber, fines, filler and dichloromethane (DCM) extractives. A detailed method of calculating the deinking selectivity of a material from experimental data, described in terms of reject ratio, is presented. Three flotation deinking systems were simulated. In a single stage flotation system, increasing the number of flotation cells improved cleanness of the accept pulp suspension while it decreased yield at the same time. Yield can be increased by adding a second stage and by introducing the accept flow of the second stage into the feed flow of the first stage. However, the cleanness of the accept pulp was deteriorated. It was shown that yield can be increased without compensating the cleanness of the accept pulp by utilizing the accept pulp from the second stage for another paper machine line instead of sending back to the feed flow of the first stage. 相似文献
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介绍了我国煤化工产业的发展现状;从思维、产品、技术、能耗等方面分析了新型煤化工的特点;指出发展新型绿色煤化工是实现煤炭资源清洁、高效、环保利用的有效途径,是今后我国煤化工产业的发展方向。 相似文献
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敌敌畏敌百虫清洁生产工艺 总被引:1,自引:0,他引:1
敌敌畏、敌百虫系中毒高效农药,仍保持着旺盛的市场前景。对敌敌畏敌百虫的传统生产工艺和“一步法”合成工艺进行了比较,后者产品含量高,质量稳定,对环境污染小,属清洁生产工艺。 相似文献