文献类型：期刊文献

英文题名：Effects of Pressurized Superheated-steam Heat Treatment on Set Recovery and Mechanical Properties of Surface-compressed Wood

作者：Gao, Zhiqiang[1,2,3] Huang, Rongfeng[1,2] Chang, Jianmin[3] Li, Ren[1,2,3] Wu, Yanmei[1,2]

第一作者：Gao, Zhiqiang

通信作者：Huang, RF[1];Huang, RF[2]

机构：[1]Chinese Acad Forestry, Res Inst Wood Ind, Beijing 100091, Peoples R China;[2]State Forestry & Grassland Adm, Key Lab Wood Sci & Technol, Beijing 100091, Peoples R China;[3]Beijing Forestry Univ, Coll Mat Sci & Technol, Beijing 100083, Peoples R China

年份：2019

卷号：14

期号：1

起止页码：1718-1730

外文期刊名：BIORESOURCES

收录：;EI(收录号：20190706501073);Scopus(收录号：2-s2.0-85061302223);WOS:【SCI-EXPANDED(收录号:WOS:000459494400122)】；

基金：The authors acknowledge the financial support from the National Natural Science Foundation of China: Formation Mechanism and Controllability of Wood Sandwich Compression by Hydro-thermal Control (Grant No. 31670557).

语种：英文

外文关键词：Surface compression; Pressurized superheated-steam; Compressed thickness; Set recovery; Mechanical properties

摘要：The recovery behavior and selected mechanical properties were studied for Populus tomentosa wood subjected to surface compression followed by heat treatment. The surface compression of wood was carried out in an open hot-pressing system at 180 degrees C with compressed thickness of 2 to 18 mm. The surface-compressed wood was treated by atmospheric heat treatment or 0.30 MPa pressurized superheated-steam heat treatment at 180 degrees C for 2 h. The results showed that the set recovery of compressed wood decreased with increasing compressed thickness before post-treatment. Atmospheric and pressurized heat treatment reduced the average set recovery of compressed wood significantly from 12.9% to 4.1% and 1.5% respectively, after conditioning at 40 degrees C and 90% relative humidity. Moreover, mechanical properties including the modulus of elasticity (MOE), modulus of rupture (MOR), hardness, and surface hardness increased with elevating compressed thickness. Both atmospheric and pressurized heat treatment reduced the MOR, hardness, and surface hardness of compressed wood. Analysis of variance showed that the effects of heat treatment on mechanical properties was not significant, except pressurized heat treatment decreased hardness significantly. With a compressed thickness of 10 mm, MOE, MOR, hardness and surface hardness were increased by 52.6%, 36.4%, 122.0% and 129.6%, respectively, compared with untreated wood.