The Effects of Heat Treatment on the Physical Properties and Surface Roughness of Turkish Hazel (Corylus colurna L.) Wood

Korkut, Derya Sevim; Korkut, Süleyman; Bekar, Ilter; Budakçı, Mehmet; Dilik, Tuncer

doi:10.3390/ijms9091772

Cited by 76 publications

(57 citation statements)

References 16 publications

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“…Boonstra et al (2007b) reported a 10% and 8.5% decrease in density for heat-treated Scots pine and Norway spruce, respectively. The results are parallel to previously published reports for different species (Yildiz et al 2006;Korkut et al 2008;Gunduz et al 2009). …”

Section: Resultssupporting

confidence: 82%

“…Degradation of the cellulose polymer, decreasing the DP, was suggested as the main cause for losses in tensile strength (Kass et al 1970;Esteves and Pereira 2009). Korkut et al (2008) reported that the lowest tensile strengths perpendicular to the grain were at 180 °C for 10 h (2.131 N/mm 2 ) in Red-bud maple (Acer trautvetteri Medw.) wood.…”

Section: Tensile Strength Parallel To the Grain (Ts)mentioning

confidence: 99%

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

Perçin¹,

Sofuoğlu²,

Uzun³

2015

BioResources

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Heat treatment changes some physical, mechanical, and chemical properties of wood. Inorganic borates have been used as wood preservatives for many years. The aim of this study was to investigate the effects of impregnation chemicals on some mechanical properties (bending strength (MOR), modulus of elasticity (MOE), tensile strength parallel to the grain (TS), compression strength parallel to the grain (CS), and shear strength parallel to the grain (SS)) of heat-treated oak (Quercus petraea Liebl.). For this purpose, the oak wood specimens were impregnated with 5% aqueous solution of boric acid (BA) and borax (BX). Then specimens were heat-treated at 160, 190, and 220 °C for 2 and 4 h. According to the results of the study, borax retention value was higher than boric acid. The bending strength, modulus of elasticity in bending, tensile strength parallel to the grain, and shear strength parallel to the grain decreased due to heat treatment. The highest mechanical strength losses were determined in samples heat treated at 220 °C for 4 h. Generally the mechanical strength losses of samples impregnated with borax were lower than non-impregnated controls and specimens impregnated with boric acid.

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Section: Resultssupporting

confidence: 82%

Section: Tensile Strength Parallel To the Grain (Ts)mentioning

confidence: 99%

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

Perçin¹,

Sofuoğlu²,

Uzun³

2015

BioResources

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“…Wood species that have no commercial value can be heat-treated and, in this way, a new use can be found for these species. On the other hand, the major disadvantage of this method is the reduction of mechanical resistance (Kubojima et al, 2000;Reiterer and Sinn, 2002;Epmeier et al, 2004;Unsal and Ayrilmis, 2005;Korkut et al, 2008). Temperatures over 150 °C permanently modify the physical and mechanical properties of wood (Mitchell, 1998).…”

Section: Introductionmentioning

confidence: 99%

Mechanical properties of heat-treated wooden material utilized in the construction of outdoor sitting furniture

Tankut¹,

Tankut²,

Zor³

2014

Turk J Agric For

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The present study examined the bending moment capacity and rigidity of T-type out-of-plane furniture joints and investigated the effects of heat treatment, wood species, and joint type factors on these joints. Heat treatment method clearly decreased the modulus of rupture (MOR) and the modulus of elasticity (MOE) of selected wood species. The bending strength of wood samples was reduced after the heat treatment, decreasing with increased loss of mass. For the heat-treated T-type joints, maximum bending strength values were obtained with Iroko (Chlorophora excelsa) for both mortise and tenon (MT) joints and blind MT (BMT) joints. The lowest reduction in bending strength was observed in Ash (Fraxinus excelsior L.) constructed with MT joints and with BMT joints. In general, the BMT joint had higher bending strength than MT joints. The best rigidity constant (7.21) was obtained with control Iroko BMT joints, while the worst rigidity constant (15.10) was obtained with control Oriental spruce (Picea orientalis L.) MT joints. In terms of heat-treated samples, the best rigidity constant (7.59) was obtained with Black pine (Pinus nigra L.) MT joints, while the worst rigidity constant (14.01) was obtained with Oriental spruce BMT joints. The maximum performance in joint stiffness was determined for Iroko sample BMT joints and Iroko MT joints. Lowest reduction in joint stiffness was observed in Scotch pine MT joints and Ash BMT joints. Heat treatment, wood type, and joint type had a significant effect on the bending strength of T-type MT post-rail joints. BMT joints produced from heat-treated Iroko wood can be considered as the most durable T-type joint for outdoor sitting furniture construction.

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“…Grau de redução similar ao observado no presente estudo para a dureza no plano tangencial e radial também foi encontrado por Korkut et al (2008), para a madeira de Pinus sylvestris L., submetida ao tratamento a 150°C. Os autores encontraram reduções em 14,68% e 18,31% no plano tangencial para o tratamento de 2 e 6 h, respectivamente e 10,65% e 13,80% no plano radial.…”

Section: Resultsunclassified

EFEITO DA TERMORRETIFICAÇÃO NAS PROPRIEDADES MECÂNICAS DAS MADEIRAS DE<i> Pinus taeda</i> E <i>Eucalyptus grandis</i>

Modes¹,

Santini²,

Vivian³

et al. 2017

Ciênc. Florest.

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RESUMOA presente pesquisa objetivou investigar o efeito da técnica de retificação térmica, empregada sob duas condições de tratamento, nas propriedades mecânicas das madeiras de Pinus taeda L. e Eucalyptus grandis W. Hill ex Maiden. De cada espécie foram amostradas três árvores com 25 anos e, de cada uma, retirada a primeira tora com 2 m de comprimento da qual foi obtida duas pranchas de dimensão 7,0 x 20,0 cm (espessura x largura, respectivamente) diametralmente opostas e destas confeccionados 30 corpos de prova para cada tratamento. No primeiro deles, denominado combinado, as madeiras foram submetidas à termorretificação em autoclave a 130/±3°C e pressão de 2 kgf/cm², por 3 horas e, após um período de condicionamento, submetidas ao calor em estufa elétrica a 160/±1°C, pelo mesmo período. O segundo tratamento consistiu apenas na termorretificação em estufa. Avaliaram-se ainda peças de madeira sem tratamento (testemunha). As propriedades mecânicas foram avaliadas por meio dos ensaios para determinação dos módulos de elasticidade e ruptura em flexão estática, resistência máxima à compressão paralela à grã e dureza Janka, conforme norma ASTM D 143 (1995), e resistência ao impacto, conforme norma ABNT NBR 7190 (1997). Para a madeira de Pinus taeda, observou-se que o tratamento em estufa forneceu os piores resultados, tanto em função da redução nos valores de carga suportada de um maior número de propriedades mecânicas avaliadas, como em relação aos menores incrementos na resistência quando observado um aumento das mesmas atribuídas ao tratamento térmico. Na madeira de Eucalyptus grandis, o tratamento combinado reduziu um maior número de propriedades mecânicas da madeira. Palavras-chave: retificação térmica; propriedades mecânicas; Pinus; Eucalyptus ABSTRACTThis study investigated the effect of thermal treatment, employed under two treatment conditions on mechanical properties of wood of Pinus taeda L. and Eucalyptus grandis W. Hill ex Maiden. From each species, three 25-year tress were sampled, and from each one, it was taken the first 2-meter long log, which was obtained from two boards of size 7,0 x 20,0 cm (thickness x width respectively) diametrically opposite from where 30 specimens were saw for each treatment. At the first one, called the combined one, the woods were subjected to heat treatment by autoclaving at 130 / ± 3°C and pressure of 2 kgf / cm ² for 3 hours and, after a conditioning period, subjected to heat in an electric oven at 160 / ± 1°C for the same period. The second treatment consisted only of heat treatment in oven. It was also evaluated the pieces of wood

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The Effects of Heat Treatment on the Physical Properties and Surface Roughness of Turkish Hazel (Corylus colurna L.) Wood

Cited by 76 publications

References 16 publications

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

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

Mechanical properties of heat-treated wooden material utilized in the construction of outdoor sitting furniture

EFEITO DA TERMORRETIFICAÇÃO NAS PROPRIEDADES MECÂNICAS DAS MADEIRAS DE<i> Pinus taeda</i> E <i>Eucalyptus grandis</i>

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