Sürdürülebilir Kalkınma Amaçları
Yayınlar
- MakaleAçık Erişim2024Nano Partiküllü Hegzagonal Bor Nitrür’ün Ağaç Malzemenin Mekanik Özelliklerine Etkileri
Yaşar, Mehmet; Yasar, Sekip Sadiye; Irkilata, Mehmet; Sen, Selim
Bu çalışma nano boyutlu Hegzagonal Bor Nitrür (h-BN) emdirmenin sarıçam (Pinus sylvetsris L.), Anadolu kestanesi (Castanea sativa M.) ve Doğu ladini (Picea orientalis) odunlarının elastikiyet modülü (ISO 13061–4) ve eğilme direnci (ISO 13061-3) üzerindeki etkilerini araştırmayı amaçlanmıştır. %1,5 konsantrasyonda nano boyutlu h-BN ile emprenye edilen sarıçam en yüksek tutma değerleri göstermiştir. h-BN ile emprenye, tüm ağaç türlerinde %1,5 ile %5 arasında değişen yoğunluk değerinde artış olmuştur. Emprenye işlemi, tüm ağaç türleri için eğilme direnci değerlerinde bir düşüşe neden olmuştur. Kontrol örnekleri ile karşılaştırıldığında, h-BN uygulaması sonrası eğilme direnci değerleri sarıçamda %25, ladinde %18.5 ve kestanede %9 azalmıştır. En düşük eğilme direnci değeri Ladin + h-BN’de (58,1 N/mm2), en yüksek Kestane kontrol örneklerinde (89,6 N/mm2) elde edilmiştir. Retensiyon değeri daha düşük olan kestane ağacı, elastikiyet açısından değişken değerler göstermiştir. Emprenye işlemi, elastikiyet modül değerlerinde sarıçamda %18, ladinde %1 oranında azalmaya neden olurken, kestanede artışa neden olmuştur. En düşük elastikiyet modülü değeri Sarıçam+h-BN’de (8530 MPa), en yüksek Sarıçam kontrol örneklerinde (10444 MPa) bulunmuştur.
- MakaleYalnız künye2018Determination of certain properties of scotch pine (Pinus sylvestris L.) wood which is impregnated with boron compounds and Quechua
Sen, Selim; Said Fidan, M.; Alkan, Elif; Sadiye Yaşar, S.
As the industrialisation and technological developments increase; the search for functional material which is environment-friendly, non-toxic, flame resistant, with a broad applicability and with high-temperature endurance also increases. Even though the wood material corresponds most of these features, its possession of an organic structure causes it to be affected negatively by damages occurring under proper conditions in the outdoor environment. Due to this reason, this study is conducted to prevent damages (biotic, abiotic pests, fire, etc.) caused by the environment to the wooden material, and to determine some physical and mechanical properties of wooden material impregnated with quechua, borax and boric acid, which are used to extend the usage life. Those features are needed in an outdoor environment. The Scotch pine (Pinus sylvestris L.) test specimens are prepared with borax, boric acid, borax+boric acid, from borax compounds, which have a great potential in Turkey, and with quechua, one of the natural impregnation substances. Then these samples are impregnated with three different (1%, 3%, 5%) solution concentrations according to ASTM 1413-76 standards and some physical-mechanical property changes are investigated. After impregnation, samples are tested and compared with control samples. According to the test results; the lowest oven dried density change is obtained in borax as 0.46 g . cm -3 in terms of boron compounds and the retention amount is determined to be highest with 3.83 kg.m -3 in the samples impregnated with boric acid. The bending strength and elastic modulus are found to be highest with 83.53 MPa and 10281 MPa in the samples impregnated with boric acid. When examined at the concentration level, it is determined to be highest with 81.89 MPa in samples with 3% concentration. There are statistical discrepancies with 55.77 MPa in the comprehensive strength parallel to grain in boric acid in terms of boron compounds.
- MakaleAçık Erişim2016Determination of biological performance, dimensional stability, mechanical and thermal properties of wood-plastic composites produced from recycled chromated copper arsenate-treated wood
Tascioglu, Cihat; Tufan, Mursit; Yalcin, Mesut; Sen, Selim
The aim of this study was to investigate the dimensional stability, mechanical and biological performance and thermal degradation of wood-plastic composites made from high-density polyethylene and recycled wood treated with chromated copper arsenate (CCA), a commonly used wood preservative chemical. Virgin pine wood samples were also prepared with and without a coupling agent and used as the control group. Samples of CCA-treated Scots pine (Pinus sylvestris L.) with varying wood content were produced by adding different ratios of the coupling agent. The recycled CCA-treated wood-filled composites exhibited better flexural and tensile strength properties and dimensional stability than the control group, whilst their impact strength was less. Biological test values showed improved durability against termites and fungus with the recycled CCA-treated wood-filled composites. In addition, the leaching of heavy metals was significantly diminished when the coupling agent was utilized at a level of 5% (w/w), thus presenting a much lower impact on the environment.