浸渍料筐表面附着沥青喷丸清理装置

在浸渍实际生产过程中,预热后的电极随料筐用送料小车一同送入浸渍罐内,料筐同电极一起完成整个浸渍过程。浸渍料筐出罐后表面上粘附着一层沥青,而承载电极的料筐是循环使用的,表面附着沥青的料筐送入预热窑后,料筐表面的沥青受热,一方面以液体形式流到预热窑底部产生焦化现象,影响预热窑的正常进出车及寿命;另一方面,会在预热窑中产生较多的沥青烟,给预热窑安全运行带来危害。因此,在重新装入焙烧品前,必须将料筐表面上的沥青清理掉。本文就为高压浸渍系统而设置的专用料筐清理系统做一简介。１浸渍料筐的清理装置———清筐机…     

液相浸渍法制备C／C复合材料

介绍了液相浸渍炭纤维坯体的两种方法，探讨了沥青浸渍和树脂浸渍的浸渍过程和增密效果，比较了两种浸渍方法的相似之处和不同之处。     

液相浸渍法制备C／C复合材料

介绍了液相渍炭纤维坯体的两种方法。探讨了沥青浸渍和树脂浸渍的浸渍过程和增密效果,比较了两种浸渍方法的相似之处和不同之处。     

液体加压浸渍过程中浸渍沥青烟气存在状态及处理

浸渍生产过程是浸渍沥青在一定温度压力作用下浸入浸渍电极孔隙的过程,浸渍沥青受热分解挥发形成的浸渍沥青烟气是浸渍沥青另一种表现形式,可应用于浸渍生产。浸渍生产操作过程中我们通过对浸渍沥青烟气实施冷凝降温利用等方法,提高浸渍沥青烟气处理能力和浸渍真空处理效率。     

浸渍过程沥青喹啉不溶物存在状态对石墨电极生产的影响

在石墨电极浸渍生产过程中,浸渍沥青喹啉不溶物含量及存在状态决定和制约浸渍生产质量.本文通过对现有浸渍生产状况的分析,探讨了浸渍沥青喹啉不溶物在浸渍生产控制各环节中的存在形态及对电极浸渍生产质量的影响.     

煤焦油沥青的净化和电极浸渍剂生产

石墨电极生产专用浸渍剂绝大部分是用煤沥青经净化、热聚合反应等过程而制得 ,浸渍剂沥青在我国目前还处于开发试制阶段 ,本文介绍了我国浸渍剂沥青开发试制进展情况和几种浸渍剂沥青的生产工艺 ,简明分析了每一种生产工艺的特点。根据国内外浸渍剂沥青的生产和使用情况 ,对加快我国浸渍剂沥青研制尽早实现工业化生产提出了建议     

煤焦油沥青的净化和电极浸渍剂生产

石墨电极生产专用浸渍剂绝大部分是用煤沥青经净化、热聚合反应等过程而制得,浸渍剂沥青在我国目前还处于开发试制阶段,本文介绍了我国浸渍剂沥青开发试制进展情况和几种浸渍剂沥青的生产工艺,简明分析了每一种生产工艺的特点。根据国内外浸渍剂沥青的生产和使用情况,对加快我国浸渍剂沥青研制尽早实现工业化生产提出了建议。     

沥青基C/C复合材料浸渍过程的模拟

研究了沥青基C／C复合材料的浸渍过程，把沥青对预制体的浸渍分为束间浸渍和束内浸渍两个阶段，并同时考虑了浸渍过程中沥青中的喹啉不溶物在预制体表面的沉积，建立了束间浸渍模型和束内浸渍模型。使用Matlab软件对模型进行求解并实现了模拟结果的图形化。结果显示：浸渍效率随浸渍压力、浸渍时间的增加而增加，速率逐渐变缓；浸渍效率随孔隙率的增加而增加，速率逐渐增大；浸渍效率以近似正比关系随纤维束平均半径的增加而增加，并随浸渍过程的进行逐渐减小。验证显示模拟结果较好地符合了实验数据，说明了该模型的合理性。     

炭材料专用浸渍剂沥青的研究进展及应用前景

综述了浸渍剂沥青浸渍效果的影响因素,介绍了国内外浸渍剂沥青的研究现状及进展情况,简单阐述了几种浸渍剂沥青的生产方法及QI的脱除方法。根据国内浸渍剂沥青的生产和使用情况,展望炭材料专用浸渍剂沥青的应用前景。     

浸渍剂沥青

针对炭素材料孔隙结构特点,提出了炭素生产用浸渍剂沥青的质量要求,着重讨论了浸渍剂沥青所含杂质对浸渍效果的影响,并介绍了国内外炭素生产用浸渍剂沥青发展状况。     

Determining the filler activity in the sintering of pitch composites

The strength of some model binder-filler composites is investigated. Specifically, these composites consist of pitch with various fillers: anthracite, pitch coke, sand, and glass. The proportions of the components vary. The dependence of the composite’s strength on the filler/binder ratio may be satisfactorily described by mathematical models with second-order equations. The activity of the carbon and noncarbon fillers with respect to the pitch may be determined. By determining the sintering properties of the pitch, the quality of the components in the pitch composites may be determined, and the strength of the composites may be predicted.     

煤沥青改性后流变性能的变化分析

为了探讨对苯二甲醛(TPA)对煤沥青改性后流变性能的变化,采用旋转黏度计测定了煤沥青及TPA改性的煤沥青的表观黏度,研究了表观黏度与温度的关系;采用示差扫描量热法研究了煤沥青和TPA改性的煤沥青的热行为。结果表明,TPA改性的煤沥青的黏度与温度的关系曲线呈现W型,在200℃～225℃处于低黏流区,表观黏度值200mPa.s～400mPa.s,可以作为浸渍剂煤沥青使用;TPA改性的煤沥青在高于225℃时,表观黏度值迅速上升;TPA改性的煤沥青在低黏度区域具有较低的活化能,这对煤沥青的浸渍工艺有益。     

热聚合温度对煤液化沥青制备中间相沥青的影响

为制备优质的中间相沥青,以煤液化沥青为原料,在不同热聚合温度下制备中间相沥青,采用偏光显微镜、红外光谱仪、XRD、热分析等测试仪器对所得中间相沥青进行分析和表征。结果表明,温度对中间相沥青的收率、形貌和结构影响显著。随着温度升高,中间相沥青的收率降至86.2%,H含量降至3.96%,S含量有所下降,残炭率增大;中间相小球体的尺寸增大,逐渐出现融并现象,最终形成广域型中间相;煤液化沥青中的稠环芳烃、芳香烃的含量明显增加,烷烃成分则明显减少;煤液化沥青中的无定型区含量减少,分子的排列与取向性变好。选择低的热缩聚温度(410~420℃),适当延长反应时间有利于反应方向的控制,从而达到制备优质中间相的目的。     

掺杂型沥青前驱体流变性能研究

对锆含量为2.18%的掺杂型沥青流变性能进行研究。结果表明:含锆沥青黏度随温度的上升而降低,在不同的温度段降低幅度不同;含锆沥青黏度随剪切速率的变化在200℃下表现为牛顿流体到非牛顿流体的变化特征,250℃下则表现为非牛顿流体到牛顿流体的变化特征。在现有掺杂含量下,含锆沥青黏度高于基础沥青,其黏性流动活化能与基础沥青相当。     

液态尤里卡沥青在槽罐运输中挂壁特性研究

通过特定组分条件下尤里卡沥青在槽罐中的反复充装试验 ,研究液态尤里卡沥青在槽罐运输中可能的结壳情况 ,观察尤里卡沥青在槽罐运输过程中的温度损失规律 ,以及沥青在槽罐中停留时间与沥青残留量的关系 ,为液体沥青槽车的订货提供依据。     

Changing the Properties of Coal Pitch by Means of Additives

The influence of various additives—including nanoparticles—on coal pitch is investigated, with a view to improving its properties. Surfactants facilitate the formation of coal-pitch products but have little effect on their properties. Materials that react with the pitch components may increase the yield and microstructure of pitch coke. Nanoparticles increase the yield of pitch coke and its aggregate strength. Additives are classified in terms of their effects on the pitch.     

碳纤维用基体前驱体煤沥青的改性研究

煤沥青经喹啉萃取后,以三氟化硼乙醚和硝基苯作为催化剂,在氮气氛下热缩聚制得改性沥青,并对改性沥青的工艺进行初步研究;利用FT-IR、热分析仪对改性沥青的结构和热稳定性进行了分析。结果表明改性后沥青脂肪族侧链明显减少,芳构化程度增加,热失重率减小,适合用于制备碳纤维。     

Surface shape development of the pitch lap under the loading of the conditioner in continuous polishing process

Continuous polishing using the pitch lap is a key process in finishing large flat optical elements. The optical elements’ surface figure is primarily dependent on the surface shape of the pitch lap, which is controlled by a large-size conditioner. However, underlying fundamentals of the process control is not yet clear, and it remains empirical and nondeterministic to date. In this study, a novel analysis model is proposed for exploring the surface shape development of the pitch lap under the conditioner loading. The analysis model divides the polishing time into a series of segments, in which the shape variation of the pitch lap due to viscoelastic creep is derived from the pressure distribution at the conditioner-lap contact interface. Further, a contact model of the lap and conditioner is built to obtain the pressure distribution at the interface, and a novel creep model is proposed for the viscoelastic behavior of the pitch lap under the pressure. The analysis model combined with the contact and viscoelastic models can be used to explore the pitch lap shape development under various conditions and hence reveal the underlying fundamentals of controlling the lap shape by the conditioner.     

Influence of the meso phase in high-temperature pitch on the properties of artificial graphite

A relation is established between the content of meso phase in high-temperature pitch and the condensation of coal tar used for pitch production. The influence of the meso-phase content in the high-temperature pitch on the quality of the artificial graphite produced is demonstrated.     

A thermoanalytical study of the co-pyrolysis of coal-tar pitch and petroleum pitch

Four pitch blends were prepared at laboratory scale by mixing a coal-tar pitch and a petroleum pitch in several proportions (CTP:PP 85:15, 70:30, 55:45 and 40:60). Single pitches and blends were characterized by standard procedures, infrared spectroscopy and size exclusion chromatography. Pyrolysis behaviour and interactions between the two pitches in the blends were studied by thermogravimetric analysis (TG/DTG) and differential scanning calorimetry (DSC). The results show that blending does not alter the composition of pitches. However, the TG/DTG curves reveal that coal-tar pitch and petroleum pitch interact actively during pyrolysis, modifying the temperature of initial weight loss and the temperature of the maximum rate of weight loss. Primary quinoline-insoluble particles present in coal-tar pitch and transferable hydrogen seem to be the main factors responsible for these modifications. The DSC curves show that the presence of coal-tar pitch in the blends reduces the reactivity of the petroleum pitch and shifts the exothermic peaks observed at the temperature of the cracking/polymerization reactions (>400 °C) to lower temperatures.