Effects of the Process Conditions on the Basic Properties and Graphitization of Woodceramics

• Main Authors: LI-HSIN WENG, 翁儷芯
• Other Authors: Song-Yung Wang
• Format: Others
• Language: zh-TW
• Published: 2005
• Online Access: http://ndltd.ncl.edu.tw/handle/58547283173811691603

博士 === 國立臺灣大學 === 森林環境暨資源學研究所 === 93 === The purpose of this research is to develop a new composite woody material, called "woodceramics", by utilizing recycle woody wastes. Woodceramics are components of wood and synthetic resin or the inorganic and procceed with high-temperature carbonization. This research is about real wood, particleboard, compreg particleboard and wood-Bentonite composite carbides’ basic properties and graphitization. To understand the woodceramics and to assess the potential usage of it, the study would focus on analyzing the physical properties (specific gravity, carbide yield, shrinking ratio , resistance coefficient, heat emissivity, etc.) and microstructure crystallization properties(size, distance among layer of crystal, etc.) related to their procedure conditions, such as different proportion of materials, carbonization temperature, intensified speed, etc. The carbide yields in solid wood, particleboard, compreg particleboard and wood-Bentonite composite decreased as carbonization temperature increased, and the microstuctures had significantly change as temperature at 500℃, 800℃, 1100℃. The shrinkage ratio of real wood, particleboard, compreg particleboard and wood-Bentonite composite increased as the carbonization temperature increased. Temperature rising rates were no siginificantly related to carbide yield and shrinkage ratio. Compreg particleboard carbide (C% ) has the minimum value in 300, 400℃, and increased as carbonization temperature raised. The electronic resistance coefficients dropped down as carbonization temperature increasing. The electronic resistance property had direction, and the resistance coefficient in parallel direction is lower than perpendicular direction. The electronic resistance coefficients had opposite relationship with the proportion of PF in impregnated particleboards, lower PF resin contain with higher resistance coefficient, and higher PF resin contain with lower resistance coefficient. Besides, the Fortune Paulownia PF impregnated particleboard and Fortune Paulownia-Bentonite composites carbide had higher radiation emissivity than metal, in the other words, these materials are excellent in heat absorption. The X-ray diffraction spectra''s 002 peak of carbide from solid wood, particleboards and impregnated particleboard are nearly appeared in 22∼23°, and the peak angle increased with increasing carbonization temperature, but the d value reduced. The X-ray diffraction spectra''s 002 peak of carbide from wood-Bentonite composites are nearly 26°, and increased to 26.5° with increasing carbonization temperature. In other words, the diamond and graphite structure ratio（G/D） in the wood-Bentonite composite''s microstructure increased as carbonization temperature increased, the G/D vaule is around 0.13 to 1.19. The extension of the crystallization（La value） is around 0.95 to 6.8, which increased with increasing carbonization temperature. No matter the difference of woodceramics procedure conditions, the wood-Bentonite carbides have signicantly different in both physical and crystallization properties, especially in graphitization properties, with solid wood, particalborads and impregnated particleboard. I would suggest further reseraches on how woodceramics properties in graphitization behavior , electromagnetic wave cover and emissibity etc.