高温热处理对尾叶桉木材声学振动性能的影响  

Effect of High-temperature Heat Treatment on the Acoustic-vibration Performance of Eucalyptus urophylla

作　　者：朱玲静[1,2] 刘一星[2] 刘镇波[2] 冯昌信[1] 韦春义[1] ZHU Ling-jing;LIU Yi-xing;LIU Zhen-bo;FENG Chang-xin;WEI Chun-yi(Guangxi Eco-engineering Vocational and Technical College,Liuzhou 545004,China;College of Material Science and Engineering,Northeast Forestry University,Harbin,Heilongjiang 150040,China)

机构地区：[1]广西生态工程职业技术学院,柳州545004 [2]东北林业大学材料科学与工程学院,黑龙江哈尔滨150040

出　　处：《广西林业科学》2017年第2期140-145,共6页Guangxi Forestry Science

基　　金：国家自然科学基金(31670559);广西壮族自治区教育厅高校科研项目(LX2014602);广西壮族自治区中青年教师基础能力提升项目(KY2016YB689);东北林业大学基本科研业务费专项资金项目(2572016EBJ1)

摘　　要：以N2为保护气体,对尾叶桉(Eucalyptus urophylla)木材进行热处理,热处理温度分别为170、190、210℃,保温时间分别为2、3、4 h,并分析处理前后其声学振动参数(比动弹性模量E/ρ、声辐射品质常数R、声阻抗ω、弹性模量与剪切模量之比E/G等)的变化,结果表明:经适当温度与保温时间的热处理后,尾叶桉处理材的E/ρ、R、E/G可得到不同程度的提高,而其ω则呈下降趋势,使得木材的声学振动性能得到有效改善。其中处理材的E/ρ的最大增幅为12.3%(190℃、2 h),其R的最大增幅为16.7%(210℃、3 h),其E/G的最大增幅为14.2%(210℃、4 h),其ω的最大降幅为6.0%(210℃、4 h)。总体结果表明,当热处理温度为210℃、保温时间为3 h时,尾叶桉木材的振动性能得到较好的改善。The acoustic-vibration parameters ofEucalyptus urophylla,including specific Young’s modulus(E/ρ),coefficient of sound-radiation resistance(R),sound resistance(ω),and the ratio of Young’s modulus to the dynamic stiffness modulus(E/G),before and after heat treatment were measured and characterized.Conditions for the heat treatment included N2as the protection gas and temperatures of170℃,190℃,and210℃with holding times of2h,3h,and4h.The results showed that specific Young’s modulus,the coefficient of sound-radiation resistance,and the ratio of Young’s modulus to the dynamic stiffness modulus increased,whereas sound resistance decreased,thereby the heat treatment with proper temperature and suitable holding time improved the acoustic-vibration performance of the wood.The maximum increments were12.3%for specific Young’s modulus(190°C,2h),16.7%for the coefficient of sound-radiation resistance(210°C,3h),and14.2%for the ratio of Young’s modulus to the dynamic stiffness modulus(210℃,4h).Conversely,the maximum decrease in sound resistance was6.0%(210℃,4h).Overall,the acoustic-vibration performance ofE.urophylla was improved through heat treatment,while the best vibration performance was obtainedat210°Cwithaholdingtimeof3h.

关 键 词：尾叶桉 木材热处理 声学性能 

分 类 号：S781.38[农业科学—木材科学与技术]