蒸汽条件下热处理蒙松木材微观结构的对比研究

Proceedings of 2012 International Conference on Biobase Material Science and Engineering Pub Date : 2012-10-01 DOI:10.1109/BMSE.2012.6466224

D. Tao, Zhang Yaoli, Nai-Wen Wang, Feng-Ping Jia

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引用次数: 0

摘要

在205°C常压蒸汽中对蒙古松木进行热处理。采用光镜和扫描电镜对热处理样品和对照样品的显微组织进行了研究。结果表明，热处理后的蒙松晚木射线薄壁细胞与管胞之间存在放射状裂纹。此外，热处理后的管胞之间也发现了裂纹，尤其是在细胞的角落。热处理过程中细胞壁构件的热降解被认为是产生裂纹和裂纹的主要原因。在光镜下观察，热处理样品的早期管胞弯曲甚至开裂。这很可能是由于显微刀的力量，而不是热处理的直接结果。热处理后无明显的边坑和交叉坑变化。

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Comparative study on microstructure of Mongolian pine wood thermally treated in steam condition

Mongolian pine wood was thermally treated at 205°C in atmospheric steam. Microstructure of heat-treated and control samples was investigated by means of light microscopy and scanning electronic microscopy (SEM). The results showed radial cracks between ray parenchyma cells and tracheids in latewood of heat-treated Mongolian pine. Besides, fissures were found between tracheids of heat-treated samples, especially at cell corners. Thermal degradation of cell wall components during heat treatment is considered as the main reason for the cracks and fissures. In light microscopy observation, earlywood tracheids of heat-treated samples were found curved or even cleaved. That is most probably due to the force of microtome knife, while not the direct outcome of heat treatment. No significant alteration of bordered pits or crossfield pits was found after heat treatment.

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Proceedings of 2012 International Conference on Biobase Material Science and Engineering

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