Synthesis and graphitization of resole resins by ferrocene

Commercial(Rs) and laboratory synthesized resoles(LSRs) containing 3–5 wt% ferrocene have been used to study the development of thermosetting resin compositions as binder materials for carbon-containing refractories(CCRs) production. The LSRs were developed based on formaldehyde to phenol 1.5 mol.%(1.5 Rs) and 2.0 mol.%(2 Rs). Microstructure and oxidation resistance of carbons derived from plain and modified resins have been compared. Chemical structure of the resins was studied using Fourier Transform InfraRed-Attenuated Total Reflection(FTIR-ATR) spectroscopy. X-ray Photoelectron spectroscopy was used to examine chemical changes during heat treatment of the modified products. Flow behavior of plain and formulated resins has been measured under isothermal condition. Rheology measurement results show that the selected amount of ferrocene did not affect the resin near-Newtonian fluid behavior and processability during refractory production. X-ray diffraction(XRD) analysis and transmission Electron Microscope(TEM) were used to characterize the derived carbon samples after thermal treatment of the resins. The results demonstrate that ferrocene is an excellent additive for crystallizing resoles carbon. The presence of fringes in TEM images indicates the graphitized carbon microstructure. The carbon reactivity in an oxidizing environment was also determined via thermogravimetric analyzer(TGA). Several factors, such as bond strength and atoms arrangement, have been found to control the carbonized modified-resin oxidation resistance.     

碳钢主蒸汽管道的石墨化检测

采用金相复型技术,利用XJB-200金相检测仪、PME-323UN金相显微镜,对火力发电 机组主蒸汽管道进行了石墨化检测。结果表明,该主蒸汽管道的弯头、焊缝热影响区和三通等 部位石墨化严重,部分部件需要更换。