CAJ | 학술논문

通过对樟子松和柞木分别在常压和一定蒸汽压力下进行热处理,比较了不同热处理木材与常规对照材的力学性能差异.结果表明:热处理使木材的抗弯强度和冲击韧性出现明显下降,然而,就抗弯弹性模量和顺纹抗压强度而言,除樟子松的MOE指标外,经过热处理的试材的性能指标都高于对照材.和常压热处理相比,压力蒸汽热处理进一步降低了试材的力学强度,但这一差异并不显著.木材化学组分分析表明,热处理材力学性能的变化主要归因于热处理过程中木材半纤维素的降解以及木素在热处理过程中的化学变化.
통과대장자송화작목분별재상압화일정증기압력하진행열처리,비교료불동열처리목재여상규대조재적역학성능차이.결과표명:열처리사목재적항만강도화충격인성출현명현하강,연이,취항만탄성모량화순문항압강도이언,제장자송적MOE지표외,경과열처리적시재적성능지표도고우대조재.화상압열처리상비,압력증기열처리진일보강저료시재적역학강도,단저일차이병불현저.목재화학조분분석표명,열처리재역학성능적변화주요귀인우열처리과정중목재반섬유소적강해이급목소재열처리과정중적화학변화.
Samples of Mongolian Pine and Mongolian Oak were heat treated in atmospheric steam and pressurized steam respectively.Comparison of mechanical properties was made between heat-treated samples and the control ones.The result showed that heat treatment lowered the modulus of rupture and dynamic fracture toughness significantly.However,with respect to modulus of elasticity and compressive strength parallel to grain,heat-treated samples were superior to the control ones,except modulus of elasticity of Mongolian pines samples.In comparision with heat-treated sample in atmospheric steam,heat treatment in pressurized steam further lowered mechanical properties of wood samples,but the difference is not statistically significant.Chemical component analysis showed that the change of mechanical behavior of heat-treated wood mostly lay in the degradation of hemicelluloses and the condensation reaction of lignin during heat treatment.