Doğu kayını (Fagus orientalis Lipsky.) odununda dielektrik özelliklerinin belirlenmesi

Abstract

Günümüzde doğu kayın (Fagus orientalis Lipsky.) odunu, mobilya, müzik aletleri, oymacılık ve kaplama malzemesi gibi çeşitli alanlarda yaygın olarak kullanılmaktadır. Bu çalışmada, doğu kayınının 100 Hz–1 MHz AC sinyal frekanslarında ve 0–100 V DC gerilim aralığında dielektrik özellikleri incelenmiş ve farklı yüzey koşullarının bu özellikler üzerindeki etkileri araştırılmıştır. Kontrol grubu ahşap (CW) ve iki hafta suda bekletilmiş ahşap (SW) örneklerinin dielektrik, termal ve serbest yüzey enerjisi davranışları kapsamlı şekilde analiz edilmiştir. Deneysel ölçümler kapsamında, özgül ısı kapasitesi (Cp), gerçek (ε′) ve sanal (ε″) dielektrik sabitleri, alternatif akım elektriksel iletkenlik (σac), serbest enerji bileşeni (G/ω), dielektrik kayıp faktörü (tanδ) gibi temel parametreler detaylı olarak değerlendirilmiştir. SW örnekleri CW örneklerine kıyasla yaklaşık 1.000 kat daha yüksek (ε″) değerleri ve (tanδ)'de iki ila üç kat artış göstermektedir. Ayrıca, (σac) CW'de ~10⁻⁹ S/m'den SW'de ~10⁻⁴ S/m'ye yükselerek, daha yüksek nem içeriği nedeniyle iyonik iletkenlikte önemli bir artış olduğunu göstermektedir. CV numuneleri tüm frekans aralığında tutarlı dielektrik özellikler göstererek yalıtım özelliklerini korumaktadır. Tüm ölçümlerin üç kez tekrarlanmış (n=3) ve standart sapmanın %5'ten küçük bulunmuştur. Bu sonuçlar, kuru odunun düşük kayıplarla tutarlı dielektrik performansını korurken, nemin iletkenliği ve dielektrik kayıplarını önemli ölçüde artırdığını göstermektedir.

Keywords

• Doğu kayın
• Dielektrik özellikler
• AC iletkenliği
• Frekans

Determination of dielectric properties in oriental beech (Fagus orientalis Lipsky) wood

Abstract

Today, the wood of the oriental beech (Fagus orientalis Lipsky.) is widely used in various applications, including furniture, musical instruments, carvings, and veneer. In this study, the dielectric properties of oriental beech were investigated at AC signal frequencies of 100 Hz–1 MHz in the voltage range of 0–100 V DC, and the effects of different surface conditions on these properties were investigated. The dielectric, thermal and surface free energy behaviors of control wood (CW) and wood soaked in water for two weeks (SW) were analyzed comprehensively. Basic parameters such as specific heat capacity (Cp), real (ε′) and imaginary (ε″) dielectric constants, alternating current electrical conductivity (σac), free energy component (G/ω), dielectric loss factor (tanδ) were evaluated in detail within the scope of experimental measurements. SW samples exhibited approximately 1,000-fold higher (ε″) values and a two-to three-fold increase in (tanδ) compared to CW samples. Furthermore, (σac) increased from ~10⁻⁹ S/m in CW to ~10⁻⁴ S/m in SW, indicating a significant increase in ionic conductivity due to the higher moisture content. CV samples maintain their insulation properties by showing consistent dielectric properties across the entire frequency range. All measurements were repeated three times (n=3) and the standard deviation was found to be less than 5%. These results show that whereas dry wood retains consistent dielectric performance with low losses, moisture dramatically increases conductivity and dielectric losses.

Keywords

• Oriental beech
• Dielectric properties
• AC conductivity
• Frequency

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