Emprenye ve ısıl işlemin karaçam (Pinus nigra) ağacının fiziksel ve mekanik özellikleri üzerine etkileri

Öz

Bu çalışmada, bor bileşikleri ile emprenye işleminden sonra farklı sıcaklıklarda uygulanan ısıl işlemin ahşap malzemenin fiziksel ve mekanik özellikleri üzerindeki etkisi incelenmiştir. Bu amaçla, deney örnekleri %1, %3 ve %5 konsantrasyonlarında boraks (Bx) ve borik asit (Ba) çözeltileriyle 48 saat daldırma yöntemiyle emprenye edilmiş ve ardından 150°C, 170°C, 190°C ve 210°C'de üç saat ısıl işlem uygulanmıştır. Deney örneklerinin hava kurusu yoğunluk, liflere paralel basınç direnci (BD) ve eğilme direnci (ED) değerleri belirlenmiştir. Araştırma sonuçları, ısıl işlem uygulanmış deney örneklerinde yoğunluk değerlerinin, artan ısıl işlem sıcaklığıyla azaldığını göstermiştir. Öte yandan, bor bileşikleri ısıl işlem uygulanmamış deney örneklerinin yoğunluk değerlerini artırmıştır. Bor bileşikleri ile emprenye işlemi ve ısıl işlem uygulaması deney örneklerinin BD özelliklerinde hafif bir artışa neden olmuştur. Ayrıca, emprenye edilmiş ve ısıl işlem uygulanmış deney örneklerinin ED değerleri, düşük sıcaklıklarda arttığı, yüksek sıcaklıklarda ise azaldığı tespit edilmiştir. Isıl işlem sırasında ED ve BD özelliklerinde görülen azalmaların, ısıl işlemden önce bor bileşikleri ile emprenye edilmesiyle hafifletildiği ve Bx ve Ba emprenye çözeltilerinin sırasıyla BD ve ED özellikleri üzerinde daha olumlu etkilere sahip olduğu belirlenmiştir.

Anahtar Kelimeler

• Bor
• ısıl işlem
• karaçam
• fiziksel ve mekanik özellikler

Effects of impregnation and heat treatment on the physical and mechanical properties of black pine (Pinus nigra) wood

Öz

In this study, the effect of impregnation with boron compounds followed by heat treatment at different temperatures on the physical and mechanical properties of wood material was investigated. For this purpose, samples were impregnated with borax (Bx) and boric acid (Ba) solutions at concentrations of 1%, 3%, and 5% using the immersion method for 48 hours, and then subjected to heat treatment at 150°C, 170°C, 190°C and 210°C for three hours. The air-dry density, compressive strength parallel to the grain (CS), and modulus of rupture (MOR) of the test samples were determined. The results indicated that air-dried density of heat-treated samples decreased with increasing heat treatment temperature. On the other hand, boron compounds increased air-dried density. The impregnation with boron compounds and heat treatment causes an slightly increase in CS properties of samples. It was also found that the MOR values of impregnated and heat treated samples increased at the initial stage of the heat treatment and decreased later. It was also determined that the decreases in MOR and CS during heat treatment were alleviated by impregnation with boron compounds before heat treatment and also the Bx and Ba impregnation solution was more favourable on the CS and MOR properties, respectively.

Anahtar Kelimeler

• Boron
• heat treatment
• black pine
• physical and mechanical properties

Kaynakça

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