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Effects of impregnation and heat treatment on density, bending and compression properties of black pine (Pinus nigra Arnold) wood
Wood Material Science & Engineering ( IF 2.2 ) Pub Date : 2021-08-30 , DOI: 10.1080/17480272.2021.1969685
Bilal Dogan 1 , Osman Percin 2 , Sait Dundar Sofuoglu 3
Affiliation  

ABSTRACT

This study aims to study the improvement in the properties of heat-treated wood material by impregnation. For this purpose, black pine (Pinus nigra Arnold) wood specimens were modified in two stages: impregnation with 1%, 3% and 5% of diammonium phosphate (DAP) and sodium carbonate (SC) compounds followed by heat treatment at four different temperatures. Test specimens were pre-treated with solutions of different pH values of either DAP or SC solutions according to the immersion method and they were exposed to heat treatments at 150°C, 170°C, 190°C and 210°C for 3 h. Some physical and mechanical properties were determined in combined treated specimens with air-dried density, compression strength parallel to grain (CS) and bending strength (MOR). The test results indicated that, as regards the effect of the heat treatment, the mechanical strength decreased due to the increase in temperature, while the losses in the CS were fewer than those of the MOR. In addition, generally combined treatments increased the mechanical properties of the specimens, especially at lower and moderate heat treatment temperatures. Moreover, the SC compound showed more favorable results against the reducing effect of the heat treatment on mechanical strengths.



中文翻译:

浸渍和热处理对黑松 (Pinus nigra Arnold) 木材密度、弯曲和压缩性能的影响

摘要

本研究旨在研究浸渍对热处理木材性能的改进。为此,黑松 ( Pinus nigraArnold) 木材样本分两个阶段进行改性:用 1%、3% 和 5% 的磷酸二铵 (DAP) 和碳酸钠 (SC) 化合物浸渍,然后在四种不同温度下进行热处理。根据浸渍法用 DAP 或 SC 溶液的不同 pH 值溶液对试样进行预处理,并在 150°C、170°C、190°C 和 210°C 下进行热处理 3 小时。结合风干密度、平行于纹理的抗压强度 (CS) 和抗弯强度 (MOR),确定了一些物理和机械性能。测试结果表明,就热处理的效果而言,机械强度因温度升高而降低,而CS的损失小于MOR。此外,通常联合处理提高了试样的机械性能,尤其是在较低和中等热处理温度下。此外,SC 化合物在热处理对机械强度的降低作用方面表现出更有利的结果。

更新日期:2021-08-30
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