文献类型：期刊文献

英文题名：Improving the Sound Absorption Capacity of Wood by Microwave Treatment

作者：Wang, Dong[1] Peng, Limin[1] Zhu, Guangyong[1] Fu, Feng[1] Zhou, Yongdong[1] Song, Boqi[1]

通信作者：Peng, LM[1]

机构：[1]Chinese Acad Forestry, Res Inst Wood Ind, Key Lab Wood Sci & Technol State Forestry Adm, Beijing 100091, Peoples R China

年份：2014

卷号：9

期号：4

起止页码：7504-7518

外文期刊名：BIORESOURCES

收录：;EI(收录号：20144800245020);Scopus(收录号：2-s2.0-84911420991);WOS:【SCI-EXPANDED(收录号:WOS:000345396900138)】；

基金：This work was supported by the key project of "Twelfth Five-year Plan" of National Science and Technology (Grant No. 2012BAD24B02).

语种：英文

外文关键词：Pinus sylvestris var. mongolica; Microwave treatment; Sound absorption capacity

摘要：Microwave treatment (MW) was used to improve the sound absorption capacity of Pinus sylvestris var. mongolica wood. The effects of the processing parameters such as MW intensity, processing time, and board thickness on the sound absorption of treated wood were investigated. Microstructure changes of the wood after microwave treatment were observed using scanning electron microscopy (SEM) and mercury intrusion porosimetry (MIP). It was found that the microwave treatment significantly enhanced the sound absorption capacity of the wood in the middle frequencies. The optimum microwave treatment parameters for Pinus sylvestris var. mongolica wood to achieve an improved permeability are: MW intensity of 18 Kw, board thickness of 30 mm, and processing time of 80 s. The maximum sound absorption coefficient of treated wood was 0.51. Micro-voids were formed in treated wood due to the destruction of the pit membranes, the wood ray cells, as well as the damage in the intercellular layer of the longitudinal tracheids. The number of micro-voids ranging from 7427.6 nm to 400 um increased, resulting in the increase in the air permeability and in sound absorption by the treated wood.