Microstructure of Eucalyptus pellita under Different Thermal Treatment Temperatures and its Effect on Physical-Mechanical Characteristic

Abstract:

Taken the eucalyptus pellita treated for example, this article introduced the microstructure of wood without heat-treatment and microstructure-change under different temperatures (80°C, 120°C, 160°C, 200°C, 240°C, 280°C), analyzed the affect of the thermal treatment on wood’s physical-mechanical characteristic from microstructure. The result shows that: 1) pit membrane on the vessel tended to be broken or deciduous; 2) as the temperature ascending, fiber appears wizened and some grows rose, cell cavity trails off, severing of fiber could be saw on the transverse section, and brittle fracture on the radial cut; 3) weight reduced as temperature went up, while bending strength and modulus of elasticity descending after ascending, vertex appears when the temperature was 120°C, resistance was seriously lost at 280°C.

• Periodical: Advanced Materials Research (Volume 214)
• Pages: 544-548
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.214.544
• Online since: February 2011
• Authors: Xue Hua Wang, Jun Liang Liu, Guo Qi Xu, Yu Bo Chai
• Keywords: Effect, Eucalyptus pellita, Microstructure, Physical-Mechanical Characteristic, Thermal Treatment, Vacuum

References

[1] Jiang Xiaomei, Ye Kelin, Lv Jianxiong. Wood properties and processing of eucalyptus and acacia plantation in china (science press, Beijing, China, 2007) (in Chinese).

[2] J. A. Santos. Mechanical behavior of Eucalyptus wood modified by heat [J] . Wood Science and Technology, 2000, 34: 39-43.

DOI: 10.1007/s002260050006

[3] ALFRED J. STAMM, HORACE K. BURR, ALBERT A. KLINE. Heat-stabilized wood (staybwood)．Report No. 1621, Forest Products Laboratory, Forest Service U. S. Department of Agriculture, (1955).

[4] SHUICHI DOI，MASAKAZU AOYAMA，SHIGERU YAM—AUCHI，et a1．Changes of decay and termite durability of Japanese larch (1arix leptolepis) wood due to high temperature kiln drying process[J]. Journal of wood Science, 2005, 51(5): 526—530.

DOI: 10.1007/s10086-004-0684-5

[5] SANDOR PONCSAK，DUYGU KOCAEFE，MOHAMEDBOUAZARA ，et a1． Effect of high temperature treatment on the mechanical properties of birch[J]．Wood Science and Technology，2006, 40(2): 647-663.

DOI: 10.1007/s00226-006-0082-9

[6] BURMESTER V A．Effect of heat—pressure-treatments of semi—dry wood on its dimensional stability[J]．Holz Roh—W erkst, 1972(31)：237-243.

[7] GIEBELER E. Dimensional stabilization of wood by moisture-heat-pressure treatment [J]. Holz Roh—Werkst, 1983(41): 87—94.

[8] OBATAYA EIICHI, TANAKA FUMIO, NORIMOTO MISATO. Hygroscopicity of heat-treated wood. I. Effects of after-treatments on the hygroscopicity of heat-treated wood [J]. Journal of the Japan Wood Research Society, 2000, 46(2): 77-87.

[9] SEBORG R M，TARKOW H，STAMM A J．Effect of heat upon dimensional stability of wood[J]．Forest Prod．Res．Soc., 1953 (3): 59-67.

[10] Liu Junliang, Li Jian, Liu Yixing. Study on the Fixation Mechanism of Compressive Deformation of Wood by PF Resin Treatment [J]. journal of northeast forestry university, , 2000, 28(4): 16～20(in Chinese). Attached Table. Microstructure change on transverse and radial section under different thermal treatment temperatures Un-thermal treatment 120℃ 200℃ 280℃.

[1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [20] 1-4: shape of vessel and fiber cell on transverse section under different thermal treatment temperature. 5-8: shape of vessel, fiber cell and xylem rays on radical section under different thermal treatment temperature. 9-12: as temperature climbing up, pit on xylem ray could not be seen, and xylem ray wall was destroyed. 13-16: as temperature climbing up, shape of pit on vessel tended to be long from round, ant pit membrane was fallen off. 17-20: compared with vessel, change of pit on fiber cell was relatively small.

DOI: 10.1093/pcp/pcw196