N_2热处理马尾松木材的耐腐性能

The decay resistance property of Pinus massoniana Lamb.wood with heat treatment of N_2

以氮气(N2)为介质,采用均匀设计法对人工林马尾松木材进行热处理,探讨处理工艺对木材耐腐性能及物理力学性质的影响.结果表明:经过N2热处理的木材,尺寸稳定性能明显提高,密度、顺纹抗压强度略有下降.处理材腐朽后质量损失率为16.4%,耐腐性能达到Ⅱ级.SEM分析表明:处理材的结构基本完好,腐朽程度较素材轻得多,说明木材的耐腐性能明显提高.马尾松木材N2热处理的较佳工艺条件为:处理温度220℃,保温时间4 h,升温速率15℃·min-1.

By uniform design experimentation, the effects of heat treatment technology in the medium of N2 on the decay resistance and physical-mechanical properties of Pinus massoniana Lamb. wood were investigated. The results were as follows： the dimensional stability of heat treated wood improved obviously, and the density and compressive strength parallel to grain decreased a bit; the mass loss ratio of treated wood was 16.4% after decay, reached level 2 （decay resistance level）. SEM analysis showed the structure of treated wood was basically intact, and the decayed degree was lower than untreated wood, thus the decay resistance property of wood improved obviously. The optimum process oSheat treated Pinus masson/ana Lamb. wood treated with N2 as medium was as fol- lows： temperature of 220 ℃ , heat preservation time of 4 hour, heating rate of 15 ℃ ·min^-1.