卧式浸渍罐端头与浸渍罐门底部残存浸渍沥青原因及处理

相对于其它浸渍装置卧式液体加压浸渍系统在质量水平,操作控制等方面有明显优势,但是卧式浸渍罐端头与浸渍罐门底部本身性质使得每一浸渍循环都残存一定量的浸渍沥青,处理残存浸渍沥青时,易造成浸渍罐端头与浸渍罐门配合障碍,严重影响浸渍生产,我们认为,浸渍罐端头与浸渍罐门底部动配合间添加橡胶圈类似材料是目前解决浸渍罐端头与浸渍罐门残存浸渍沥青有效方案。     

高压浸渍生产系统的设计与实施

高压浸渍系统把炼钢用石墨电极、白云石砖、耐火材料真空脱气后，注入沥青，进而在高压状态下使沥青完全浸渗到浸渍品的气孔中去。浸渍系统以独特的方式，将其核心部分浸渍罐设计成卧式，可进行连续生产，该系统由浸渍罐、贮溜槽、预热炉、冷却室等构成，并辅设真空排气装置、加压装置、载热体加热装置以及输送装置等，以满足生产要求。     

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。     

浅谈炭素制品浸渍工艺的改进

本文参照国外高压浸渍装置。结合目前我国现状,对炭素浸渍工艺提出了几方面的改进意见,诸如加压介质和加压方法;浸渍品冷却工艺;防止注入沥青时有沥青进入真空系统的技术措施;浸渍剂返回以及沥青烟气的净化等方面的改进。     

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清剂沥青的质量要求,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。     

浅论低喹啉不溶物的浸渍沥青性能

本文对日本三菱浸渍沥青(以下简称三菱浸渍沥青)和鞍钢中温沥青的基本性能、粘度及热失重等进行了分析测定。并对这两种沥青进行了浸渍效果试验。结果表明:低喹啉不溶物的三菱渍浸沥青比鞍钢中温沥青浸渍效果好。     

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。     

炭/炭复合材料浸渍-炭化工艺的研究

用高、中、低软化点沥青为浸渍剂,对不同孔率的炭 /炭复合材料编织体进行浸渍。考察了浸渍温度、浸渍压力、浸渍时间等因素对浸渍效果的影响 ;并且对用高产炭沥青浸渍炭 /炭复合材料的工艺进行了初步探索。结果表明,在合适的工艺条件下对不同的基体均可达到很好的浸渍效果。     

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。     

浸渍剂沥青和黏结剂沥青渗透性对比研究

选择两类具有相近流变性能的黏结剂沥青和浸渍剂沥青,模拟炭材料的微孔分布测定了两类沥青的渗透率,对比研究了浸渍剂沥青和黏结剂沥青的渗透性能差异。结果表明,浸渍剂沥青的渗透性能远优于黏结剂沥青,浸渍剂沥青的渗透率为黏结剂沥青相应值的3.54~22.13倍,两类煤沥青的渗透性差异是由于其QI含量不同造成的,浸渍剂沥青极低的QI含量(0.2%以下)大大降低了煤沥青向多孔滤材中的渗透阻力,为提高浸渍效果创造了有利条件。     

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。     

浸渍废沥青的再生

对炭素厂浸渍后的废沥清再生的可能性进行了研究。研究表明浸后废沥青可以通过离心分离法脱除其中的固形杂质及喹啉不溶物，喹啉不溶物的脱除率与废沥青稀释剂的溶剂比有关，所得再生沥青的喹啉不溶物的含量均低于炭素厂对粘结剂和浸渍剂的要求。     

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。     

Investigation of primer/preservative basecoats for timber using vacuum impregnation

A novel low-cost treatment process was developed to improve the long-term durability of factory furnished joinery components for exterior use. This process involved the vacuum pressure impregnation of combined preservative and primer basecoats in a single treatment operation. A comprehensive comparison was made of the effect of vacuum impregnation and dip coating, the current method of application, on the adhesion properties of the basecoats. This work was carried out on both as-received and surface-treated pine samples. The latter being surface activated using a flame ionisation technique prior to impregnation. The strength and failure modes of the coatings were evaluated on samples in both wet and dry conditions. It was found that vacuum impregnation improved the adhesion of the basecoats, particularly in the wet condition, and that the use of a flame ionisation surface treatment prior to the application of the coating improved coating penetration, thus enhancing long-term preservation of the wood.     

Effect of Vacuum Impregnation-Dehydration on the Mechanical Properties of Apples

The effect of sucrose solution concentration and vacuum/atmospheric pressure periods on the mechanical properties of apples (Gala var.) was studied through a stress relaxation test. The empiric model proposed by Peleg was used to fit the curves and the parameters a (level of relaxation) and b (relaxation rate) were evaluated. The experimental results obtained in this study showed that vacuum impregnation conditions had a great influence on the final mechanical properties of the apples. The Peleg model fitted well the data from the stress relaxation curves and may be useful for assessing sample deformation resulting from the vacuum impregnation process.     

Effect of Vacuum Impregnation-Dehydration on the Mechanical Properties of Apples

The effect of sucrose solution concentration and vacuum/atmospheric pressure periods on the mechanical properties of apples (Gala var.) was studied through a stress relaxation test. The empiric model proposed by Peleg was used to fit the curves and the parameters a (level of relaxation) and b (relaxation rate) were evaluated. The experimental results obtained in this study showed that vacuum impregnation conditions had a great influence on the final mechanical properties of the apples. The Peleg model fitted well the data from the stress relaxation curves and may be useful for assessing sample deformation resulting from the vacuum impregnation process.     

我国耐火材料真空油浸技术的现状与未来

对我国耐火材料行业的真空浸渍工艺及设备现状进行了分析，介绍了国产化真空油浸装备及工艺特点。指出今后应积极倡导推广应用高温、高压，符合环保要求的真空油浸工艺及装备。     

Enhanced corrosion resistance of magnesia-chrome refractories impregnated with zirconia sol

In order to enhance the corrosion resistance to molten vanadates and silicates of middle and upper checker bricks in glass furnace regenerator with petroleum coke as fuel, the present research improved the microstructure, compactness and corrosion resistance of magnesia-chrome refractories by vacuum impregnation with zirconia sol. The results show that the vacuum impregnation of zirconia sol and the increased impregnation times led to the significant increase in the bulk density and decrease in the apparent porosity of refractories, and the impregnated zirconia particles enhanced the corrosion and penetration resistance. The penetrated zirconia particles in the pores decreased the porosity and pore size of refractories, resulting in the inhibited penetration of vanadate and silicate liquid phases during the corrosion process. In addition, the zirconia particles around periclase particles also prevented the reaction between molten corrosion reagent and periclase, thus enhancing the corrosion resistance of refractories. The present study provides an effective method for improving the corrosion resistance of magnesia-chrome checker bricks in regenerator of glass furnace with petroleum coke as fuel.     

Influence of chrome-bearing sols vacuum impregnation on the properties of magnesia-chrome refractory

Two kinds of nanosized chrome-bearing sols, i.e. Cr₂O₃ precursor sol and MgCr₂O₄ spinel precursor sol, were obtained by homogeneous precipitation. Properties of the sol vacuum impregnated magnesia-chrome refractory, such as bulk density, cold crushing strength, pore distribution, and chemical composition, etc., are superior to those of the un-impregnated sample. SEM micrographs show a different microstructure of the impregnated sample as compared to the un-impregnated one. The influence of vacuum impregnation on copper slag corrosion resistance of magnesia-chrome refractories has also been evaluated. The results show that both sols could improve the magnesia-chrome bricks corrosion resistance in impregnation.     

抗氧化浸渍石墨材料的研制及其性能考察

采用真空溶液浸渍法研制出具有抗氧化性能的浸渍石墨材料,并对浸渍工艺条件进行了优化。同空白试样相比,浸渍材料的机械强度明显增加,气孔率大大降低,体积密度增大,电阻率有所下降,在相同氧化条件下的抗氧化性能有显著提高。