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木材原本是一种绿色、可再生的结构材料,但其力学性能距离钢铁、铝合金等工程材料仍有明显差距。过去几年,“超强木”“致密木”等概念多依赖高温、高压的机械压缩。然而这类材料只在纵向拉伸和弯曲方面表现突出,限制了其在复杂受力工况中的应用。

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木材原本是一种绿色、可再生的结构材料,但其力学性能距离钢铁、铝合金等工程材料仍有明显差距。过去几年,“超强木”“致密木”等概念多依赖高温、高压的机械压缩。然而这类材料只在纵向拉伸和弯曲方面表现突出,限制了其在复杂受力工况中的应用。

. 木头也能替代金属做成钉子. 科技导报, 2025 , 43 (22) : 4 -4 .
. Science & Technology Review, 2025 , 43 (22) : 4 -4 .
木材原本是一种绿色、可再生的结构材料,但其力学性能距离钢铁、铝合金等工程材料仍有明显差距。过去几年,“超强木”“致密木”等概念多依赖高温、高压的机械压缩。然而这类材料只在纵向拉伸和弯曲方面表现突出,限制了其在复杂受力工况中的应用。
南京大学陈延峰团队提出一种不需要外加热压的“自致密”策略,将普通木材直接转化为密实度接近金属的超强结构材料。
研究人员选择“顺势而为”,利用木材本身的收缩特性,实现从内部向外的“自致密”。其以椴木为原料,先用氢氧化钠/亚硫酸钠溶液对木材进行部分脱木质素处理,释放被木质素束缚的纤维素微纤丝;随后进行溶胀,使纤维素束在保留纵向排列的前提下向细胞腔内部均匀迁移并填充孔隙;最后仅通过室温空气干燥,在毛细力驱动下体积自发收缩、结构自发致密。经该过程处理后,木材体积缩小约79%,密度提升至约1.25 g/cm3,与机械压缩致密木相当,但沿截面是各向均匀收缩、长度方向几乎不变。
得益于这种多尺度微结构重构,自致密木在各个方向上都获得了“均衡增肌”。在纵向,该材料的拉伸强度约为天然木的9倍,比多种机械压缩致密木更高;其断裂功比天然木高1个数量级,有效缓解了传统高强材料“强则不韧”的矛盾。
更重要的是,由于截面是均匀收缩而非单向压扁,自致密木在切向和径向的拉伸、弯曲和冲击性能均大幅提升。
为了展示工程应用潜力,团队还用自致密木加工出了“木钉”。实验表明,这种木钉可以轻松钉入3层板材而无须预钻孔。
(来源:中国科技期刊卓越行动计划入选期刊《Journal of Bioresources and Bioproducts》,2025,10(2))

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2种不同金属材料的力学参数

Family
属数
Number of
genus
种数
Number of
species
占总种数比例
Percentage of
total species (%)

Genus
种数
Number of
species
占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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