Effects of Boron Impregnation and Heat Treatment on Some Mechanical Properties of Oak (Quercus petraea Liebl.) Wood

Perçin, Osman; Sofuoğlu, Sait Dündar; Uzun, Oğuzhan

doi:10.15376/biores.10.3.3963-3978

Cited by 30 publications

(31 citation statements)

References 29 publications

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“…The main disadvantage of such heat treatments is the reduced strength properties of the end product based on mass loss and chemical degradation of wood (Bekhta and Niemz 2003;Yıldız et al 2006;Korkut et al 2008;Welzbacher et al 2008;Gündüz et al 2010;Pelit et al 2015b;Perçin et al 2015). Furthermore, during heat treatment, wood defects such as cracking (internal and/or surface cracks), collapsing and deformation (e.g., bow, spring, twist, and cup) may occur because of the changes in the anatomical structure of wood (Boonstra et al 2006).…”

Section: Introductionmentioning

confidence: 99%

Effects of Heat Post-Treatment on Dimensional Stability and Water Absorption Behaviours of Mechanically Densified Uludağ Fir and Black Poplar Woods

Pelit¹,

Budakçı²,

Sönmez³

2016

BioResources

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One of the most persistent problems with mechanically densified wood is its inherent dimensional instability. The effects of heat post-treatment on the changes in spring-back (SB), compression ratio recovery (CRR), thickness swelling (TS), and water absorption (WA) of newly-tested Uludağ fir (Abies bornmuelleriana Mattf.) and black poplar (Populus nigra L.) wood samples that had been thermo-mechanically densified were investigated. Samples were densified with compression ratios of 25% and 50% with temperatures of 100 and 140 °C, respectively. Then, the heat post-treatment was applied to the samples at 185 and 212 °C for 2 h. For the two newly-tested wood types, results of the preliminary study show that SB and TS were higher at a 50% compression ratio compared with 25%. Regarding densification temperature, TS was lower in samples densified at 140 °C, while SB was higher. WA values were lower in compressed samples (50%) at high rates. The effect of the densification temperature on WA was insignificant. Heat post-treatment had a considerable effect on the dimensional stability and hygroscopicity of the densified Uludağ fir and black poplar samples. With an increase in heat treatment temperature, the dimensional stability increased, while the hygroscopicity of densified samples decreased. As a result of heat posttreatment applied at 212 °C, SB, CRR, TS, and WA decreased by 88%, 85%, 79%, and 53%, respectively.

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Section: Introductionmentioning

confidence: 99%

Effects of Heat Post-Treatment on Dimensional Stability and Water Absorption Behaviours of Mechanically Densified Uludağ Fir and Black Poplar Woods

Pelit¹,

Budakçı²,

Sönmez³

2016

BioResources

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“…Such treatments include a two-stage impregnation and heat treatment (Perçin et al 2015;Lahtela and Kärki 2016); magnetization followed by furfurylation (Dong et al 2016); boron impregnation and heat treatment (Kartal et al 2008); densification followed by oil heat treatment (Fang et al 2011(Fang et al , 2012, as well as freezing and heating treatment (Awoyemi et al 2010;Missio et al 2015Missio et al , 2016.…”

Section: Introductionmentioning

confidence: 99%

Physical and Mechanical Properties of Fast-Growing Wood Subjected to Freeze-Heat Treatments

et al. 2016

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The physical and mechanical performance of wood from the rose gum (Eucalyptus grandis) and the Gympie messmate (Eucalyptus cloeziana) species were investigated. The wood samples were treated with a twostage freeze-heat thermal process. Fast-growing trees were used for preparing test samples, which were subjected to thermal treatments. The freezing stage had the treatment temperature fixed at -22 °C for 72 h, while the temperature of the heat stage ranged from 180 to 200 °C for 3.5 h. The measurements of mass loss, density, and equilibrium moisture content were determined to better understand the mechanical properties. Static bending, compression parallel to grain, Janka hardness, and impact tests were applied to reveal changes in the mechanical behavior of the treated wood. In general, the freezing stage decreased the mass loss and increased the moisture content of wood (when combined with the heating stage), which showed the opposite trend for the heating stage. Modulus of elasticity and compression strength were increased only after the heating stage, while decrements were found for modulus of rupture, impact strength, and Janka hardness. The two-stage treatments did not prevent a decrease in the mechanical properties; however, they were helpful in preventing higher mechanical resistance losses in hardness (the Gympie messmate) and impact resistance (the rose gum).

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“…Average values for compression strength in L, R, T directions calculated in this study are shown in Table 3. The average compression strength of oak species varies from 51 to 75 N/mm 2 (Berkel 1970, Dündar 2002, Keskin 2004, Munoz and Gete 2011, Perçin et al 2015. Sessile oak used in these tests appears to be somewhat lower in compression strength L direction than average reported in the literature.…”

Section: Resultsmentioning

confidence: 94%

Some orthotropic mechanical properties of Sessile oak (Quercus petrea) as influenced by moisture content

Güntekin¹,

Aydın²,

Niemz³

2016

Eurasian Journal of Forest Science

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In this study, the influence of moisture content on some orthotropic mechanical properties of sessile oak which is one of the most important wood species grown in Turkey and common in the furniture industry have been investigated. The properties studied include Young's modulus, Poisson's ratios and compression strength of oak wood in three anatomical directions. These properties are important input parameters for three dimensional modeling of mechanical behavior in advanced computer programs such as finite elements. The samples which were approximately 20 x 20 x 60 mm in dimensions were conditioned at 20 °C and 50, 65, 85, 95 % relative humidity conditions for 6-8 weeks and subjected to compression tests in order to determine elastic and strength properties. Results indicate that properties investigated significantly differ among all anatomical directions. Young's modulus ranged from 10305 to 6984 N/mm 2 in L direction, from 2032 to 1132 N/mm 2 in R direction and from 1208 to 715 in T direction. Compression strength varied between 48.5 and 25.5 N/mm 2 in L direction, 16.45 and 9.60 MPa in R direction, and 10.2 and 7.1 in T direction. Poisson's ratios are found to be in between 0.061 and 0.7. Results indicated that all properties of the samples tested were strongly affected by moisture content.

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Effects of Boron Impregnation and Heat Treatment on Some Mechanical Properties of Oak (Quercus petraea Liebl.) Wood

Cited by 30 publications

References 29 publications

Effects of Heat Post-Treatment on Dimensional Stability and Water Absorption Behaviours of Mechanically Densified Uludağ Fir and Black Poplar Woods

Effects of Heat Post-Treatment on Dimensional Stability and Water Absorption Behaviours of Mechanically Densified Uludağ Fir and Black Poplar Woods

Physical and Mechanical Properties of Fast-Growing Wood Subjected to Freeze-Heat Treatments

Some orthotropic mechanical properties of Sessile oak (Quercus petrea) as influenced by moisture content

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