硅钢涂层中树脂成分对电泳漆附着性影响的试验研究

通过对涂覆涂层中无机成分、有机成分和含有不同树脂成分的无取向硅钢涂层样板进行电泳涂漆工业试验,研究电泳漆附着性的影响因素。结果表明：涂层中无机成分对电泳漆附着性无不良影响,涂层中树脂成分对电泳漆附着性有显著影响。     

无取向硅钢涂层设备的应用状况与分析改进

介绍了目前无取向硅钢涂层设备的应用状况,对目前涂层设备存在的问题进行分析和总结,同时提出相应的改进建议措施,有助于硅钢涂层设备的改进和硅钢涂层质量的提高。     

知识问答

<正>取向硅钢使用绝缘涂层的种类是什么?答:取向硅钢使用的绝缘涂层有T_1和T_2两种,都是磷酸盐无机涂层。T_1涂层为灰色,涂层厚度为3μm左右,附着力较好,层间电阻大于70Ω·cm~2/片,同时具有良好的防锈性和耐油性,成本也较低。但是T_1涂层的作业性很差,易产生游离磷使表面发黏,影响使用,目前已被新型的涂层所代替(如T_2涂层)。     

取向硅钢表面涂层结构对其性能的影响

通过扫描电镜观察取向硅钢截面涂层结构,分析其对取向硅钢绝缘性能、附着性、铁损的影响。研究结果表明:取向硅钢底层的钉扎、硅酸镁涂层、磷酸盐涂层共同作用影响着取向硅钢的性能;取向硅钢底层质量差会导致其绝缘性能和磁性能差;底层钉扎对铁损影响较大,钉扎厚度为3μm时,取向硅钢的铁损低且附着性好;硅酸镁涂层越致密均匀,取向硅钢的附着性越优良;钢板的底层厚度与磷酸盐涂层厚度同时影响着取向硅钢的绝缘性能,在相同的底层厚度下,提高磷酸盐涂层的厚度有利于提高钢板的层间电阻。     

G2涂层部分产品脱落的机理研究

在冷机行业中，冷轧硅钢冲成的定子和转子需要发兰处理。在发兰过程中G2涂层部分产品出现脱落现象。严重影响了G2涂层的使用，本文通过大量试验。分析了G2涂层脱落产生的原因和机理。并制定了相应的改善措施。为确定G2涂层的合理发兰工艺和避免脱落提供了理论依据。     

取向硅钢底层结构对表层附着性的影响

通过对附着性较好和附着性较差的取向硅钢的微观形貌和成分分布进行对比,研究了取向硅钢的底层结构对附着性的影响。结果表明:取向硅钢底层主要分为绝缘涂层和硅酸镁玻璃层(部分硅酸镁底层深入基体形成钉扎),硅酸镁玻璃层和磷酸盐绝缘涂层没有明显的过渡层以及相互融合的区域;取向硅钢附着力的主要来源应为硅酸镁底层与钢基之间的机械作用,附着性的好坏主要由硅酸镁底层的结构来决定;良好的附着性需要致密的硅酸镁底层并且搭配大颗粒的钉扎,钉扎分布的位置靠近硅酸镁底层,形成"半岛状"钉扎。底层中镁铝尖晶石应分布在钉扎中。     

取向硅钢涂层附着性与玻璃层质量关系研究

取向硅钢涂层附着力是衡量产品表面质量和应用性的重要指标,附着性不良会造成产品合格率和应用性降低。本文以不同附着性取向硅钢成品板为研究对象,通过扫面电子显微镜、EDS能谱分析等手段对表面层典型物相及结构特征进行观测并分析其影响因素,为改善涂层附着性提供理论依据。结果表明,附着性与玻璃层结构具有对应性,高附着性样品表面层主要由总厚度约为3μm的连续层状结构(绝缘层、玻璃层)和0.5～4.0μm的颗粒状嵌入物组成,并具有均匀Mg带状分布,其连续分布、平整度较高的玻璃层以及细小均匀的基体内钉扎颗粒物有利于提高表面层附着性。     

无取向硅钢铬酸镁绝缘涂层的麻点缺陷分析

为解决无取向硅钢铬酸镁绝缘涂层易出现表面"点状"麻点缺陷,提高硅钢涂层板的表面质量和使用性能。利用扫描电子显微镜及能谱仪分析了光辊工艺所制备的铬酸镁绝缘涂层的麻点缺陷的微观形貌,对比分析麻点缺陷位置的成分差别。结果表明:铬酸镁绝缘涂层的麻点缺陷主要发生在基板的凹坑处,麻点处的Cr、Mg、O元素含量明显高于正常涂层,麻点缺陷结构类似于"火山"或"环形山"结构,中间凹口处的涂层脱落严重,涂层厚度由中心依次向四周辐射递减,且分布许多横纵交错的龟裂纹。涂料中悬浮的固体颗粒物是产生麻点缺陷的主要因素,优选涂料原料、严格生产工艺、增加真空过滤设备是解决麻点缺陷的有效措施。     

高磁感取向硅钢涂层技术

涂层技术在高磁感取向硅钢生产中起着重要的作用.根据生产实践,介绍了高磁感取向硅钢生产中涂层的种类和作用、涂料的成分和对产品性能的影响、涂层工艺质量控制要点和检验方法等,并提出了通过优化涂层工艺改善高磁感取向硅钢性能和外观质量的方法.     

无取向硅钢涂层的现状及发展趋势

概述了无取向硅钢涂层的类型和现状,介绍了不同类型涂层的性能、优缺点和应用领域.提出了多个种类、不同用途、性能各异的高功能化的环保涂层是无取向硅钢涂层的发展趋势.     

转炉炉壳热应力分析

根据实际转炉建立实体模型。以有限元为手段,考虑了炉衬和炉壳材料的物性参数随温度变化的特点和炉衬与炉壳之间膨胀间隙,计算了转炉炉壳在温度载荷和炉衬膨胀压力同时作用下的热应力。所得结果可为转炉炉壳设计提供依据。     

焦炭热性能指标意义浅析

通过对焦炭在高炉内的历程及其变化规律的剖析,阐述焦炭热性能指标的意义,形象地把焦炭在高炉内的损耗分为三部分(M1,M2,M3)。指出M2对焦比及焦炭价格有一定的指导作用。     

Results of treatment of cancer of the cardia

Cancer of the cardia is traditionally discussed with cardiac cancer of the lower portion of the esophagus and upper gastric cancer invading the esophagus, and the specific characteristics of cancer of the cardia have never been clearly defined. We reviewed the outcome of 172 patients with adenocarcinoma of the cardia who had undergone radical surgery between 1949 and 1994 in the Division of Gastrointestinal Surgery of the Cancer Institute Hospital. The centers of the tumors were located within 2 cm above and below the boundary between the esophagus and the stomach, and their longitudinal diameter was less than 8 cm. We divided the patients into an early period (1949-1979; n = 79) and a late period (1980-1994; n = 93), and focused on the historical transition. There were no differences in patient gender or histology between the two periods. However, the late period was associated with fewer cases of esophageal invasion and shorter longitudinal diameter, as the age of the population advanced. The number of advanced cancers such as the localized and infiltrative type had decreased, and early cancer and early clinical stage had become more common, but despite the fact that the number of early cancers had increased, extended dissection, such as thoracic and paraaortic lymph node dissection, was performed more frequently. By clinical stage, the long-term outcome markedly improved in Stage I patient in the late period, and tended to improve in Stage II and III patients. This appears to have been attributable to the prevention of micrometastasis by extended dissection, although the number of early cancers is another major potential cause. There were no differences in the outcome of Stage IV patients between the two periods, and further advances in multimodality therapy must be awaited. The range of resection is basically proximal gastrectomy, and if there are adequate indications, the prognosis is favorable. In view of the status of lymphatic flow and lymph node metastasis, and long-term results, lateroaortic lymph node dissection is important. Since the number of early cancer patients has been increasing, if intraabdominal recurrence is prevented, intrathoracic lymph node dissection will contribute greatly to the outcome of such patients.     

The effect of amount of possession of the trait of hostility on accuracy of perception of hostility in others.

Some theories of personality hold that an individual's perception of others is influenced by his own personality characteristics; more specifically, that a trait of low social value will be projected more into others, and that insight into the possession of these characteristics reduces this distortion. These 2 hypotheses were tested by having a group of college students rate each other (including themselves) on degree of friendliness or hostility. Agreement with group rating about self yielded the insight score. In general, the hypotheses were supported; the "friendly" Ss were most accurate in their perception of others, and insight was positively associated with accurate perception. From Psyc Abstracts 36:04:4HL16M. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Comparison of rates of infection of two methods of emergency ventricular drainage

The rates of infection of two methods of external ventricular drainage in use at Atkinson Morley's Hospital--namely, (a) percutaneous drainage with Rickham reservoirs and (b) tunnelled ventriculostomies--were compared in this retrospective review. Percutaneous drainage of CSF with Rickham reservoirs was associated with a 27% rate of infection as identified by positive microbiological cultures; tunnelled ventriculostomy catheters had a 10% infection rate. The difference in the infection rate between the two methods was statistically significant (P < 0.015). Other variables examined, including the age and sex of the patients and the reasons for ventricular drainage, were not associated with an increased rate of infection. Most infections from either method were caused by a coagulase negative staphylococcus. The average duration of ventricular drainage before identification of positive cultures was 5.7 days for Rickham reservoirs and 6.0 days for ventriculostomies.     

浅析《野草》的版画特征

鲁迅先生一生热爱美术作品,对版画中木刻兴趣尤甚.<野草>作为其"写心之作",亦呈现出一些与木刻版画一致的审美特征:一是具有木刻版画的色彩特征,多对比、多冷色,有阴郁的美感;二是具有木刻版画的力度特征,环境描写、人物刻画处处刀锋毕现,遒劲有力,有一种"力之美".     

四辊破碎机车刀架的改造

针对四辊破碎机车刀架车削中存在的几个问题,详细介绍了电动车刀架的结构和工作原理,建立主要设计参数的数学表达式,并进行适当的分析。改造后,这种电动车刀架运行平稳、可靠、方便、省力,取得了预期的效果。     

Effect of antibiotics of chemotaxis of human leukocytes

The effect of 20 different antibiotics on chemotaxis by human neutrophils was studied. Human leukocytes incubated with chloramphenicol, rifampin, sodium fusidate, and tetracyclines in vitro showed markedly depressed migration. The mechanisms by which these antibiotics affect leukotaxis are discussed.