Copper and aluminium deposition by cold-plasma spray on wood surfaces: effects on natural weathering behaviour

2016 ◽  
Vol 75 (3) ◽  
pp. 315-324 ◽  
Author(s):  
P. Gascón-Garrido ◽  
N. Mainusch ◽  
H. Militz ◽  
W. Viöl ◽  
C. Mai
Keyword(s):  
Plasma Spray ◽  
Cold Plasma ◽  
Natural Weathering ◽  
Wood Surfaces ◽  
Weathering Behaviour

scholarly journals Weathering Behaviour of Cunninghamia lanceolata (Lamb.) Hook. under Natural Conditions

Forests ◽  
2020 ◽  
Vol 11 (12) ◽  
pp. 1326
Author(s):  
Xinjie Cui ◽  
Junji Matsumura
Keyword(s):  
Chinese Fir ◽  
Cunninghamia Lanceolata ◽  
Natural Conditions ◽  
Structural Degradation ◽  
Before And After ◽  
Wood Utilization ◽  
Pre Treatment ◽  
Wood Surfaces ◽  
Weathering Behaviour

Information on the weathering behaviour of Cunninghamia lanceolata (Lamb.) Hook. is needed to provide references for wood weatherproof pre-treatment and to improve wood utilization. Therefore, this study was conducted to understand the variation in the intrinsic weathering behaviour of Cunninghamia lanceolata (Chinese fir) under natural conditions. Wood samples from 15 Cunninghamia lanceolata trees aged 26–30 years old were used. The structural degradation and discoloration of wood surfaces before and after exposure were compared. The results show that the weathering behaviour of wood was weakened from heartwood to sapwood and enhanced from the bottom to the top. This study provided information for weatherability research and improved wood utilization of Cunninghamia lanceolata.

scholarly journals Shelling of Growth Rings at Softwood Surfaces Exposed to Natural Weathering

Coatings ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 862
Author(s):  
Lukie H. Leung ◽  
Philip D. Evans
Keyword(s):  
Growth Ring ◽  
Inverse Correlation ◽  
Natural Weathering ◽  
Woody Tissue ◽  
Growth Rings ◽  
Western Larch ◽  
Wood Surfaces

Shelling is the delamination of growth rings and the projection of woody tissue from wood surfaces. Shelling disrupts coatings and makes refinishing difficult, and a better understanding of the phenomenon is needed to help alleviate its unwanted effects. We tested whether confocal profilometry could quantify shelling in flat-faced and profiled-faced western larch deckboards exposed to natural weathering and examined the effects of growth-ring orientation and angle on shelling. Confocal profilometry was able to quantify shelling in both deckboard types. Shelling developed at the surface of flat-faced deckboards oriented pith-side-up, whereas it was absent from boards oriented bark-side-up. We found an inverse correlation between the height of shelled growth rings and the angle of growth rings to the surface of flat-faced boards. Shelling occurred in profiled-faced boards oriented pith-side-up due to the delamination of growth ring tips and projection of latewood from wood surfaces. A superficially similar although less pronounced phenomenon was seen in profiled-faced boards oriented bark-side-up. The shelling of profiled-faced boards oriented pith-side-up created lanceolate-shaped slivers of latewood that projected from the peaks of profiles. Some of these latewood tips were sharp and, for this reason, we suggest that profiled-faced western larch deckboards should always be oriented bark-side-up rather than pith-side-up.

scholarly journals A Method for Accelerated Natural Weathering of Wood Subsurface and Its Multilevel Characterization

Coatings ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 126
Author(s):  
Anna Sandak ◽  
Jakub Sandak ◽  
Marion Noël ◽  
Athanasios Dimitriou
Keyword(s):  
Structural Damage ◽  
Structural Integrity ◽  
Degradation Process ◽  
Natural Weathering ◽  
Bordered Pits ◽  
Ft Ir ◽  
Short Time ◽  
Wood Surfaces ◽  
Kinetics Of

The function of altering weathering factors and degradation mechanisms are essential for understanding the weathering process of materials. The goal of this work was to develop a method for the acceleration of natural weathering and to investigate the molecular, microstructure and macrostructure degradation of wood caused by the process. Tests were performed in the whole month of July, which, according to previous research, is considered as the most severe for weathering of wood micro-sections. Sample appearance was evaluated by colour measurement. Scanning electron microscopy was used for evaluation of the structural integrity and changes in the microstructure of wood morphological components. Changes on the molecular level were assessed by means of FT-IR spectroscopy. Observation of the effects of weathering allowed a better understanding of the degradation process. Typical structural damage, such as cracks on bordered pits and cross-field pits, and, as a consequence, their erosion, revealed the sequence of the degradation process. It was confirmed that earlywood was more susceptible to damage than latewood. Even if the weathering test was conducted for a relatively short time (28 days) the ultra-thin wood samples changed noticeably. The progress of alteration was similar as usually noticed for wood surfaces, but occurred at shorter exposure times. The estimated acceleration factor was ×3, compare to the natural weathering kinetics of wood. The research methodology presented can be used for the determination of the weather dose-response models essential to estimate the future service life performance of timber elements.

scholarly journals Effects of Climate on Exterior Wood Coating Performance: A Comparison of Three Industrial Coatings in a Warm-Summer Mediterranean and a Semi-Arid Climate in Oregon, USA

Coatings ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 85
Author(s):  
Kent Davis ◽  
Scott Leavengood ◽  
Jeffrey J. Morrell
Keyword(s):  
Wood Species ◽  
Fungal Growth ◽  
Natural Weathering ◽  
Specific Information ◽  
Timber Species ◽  
Coating Performance ◽  
Wood Coatings ◽  
Film Forming ◽  
Mass Timber ◽  
Wood Surfaces

Wood exposed in exterior applications degrades and changes color due to weathering and fungal growth. Wood coatings can reduce the effects of weathering by reducing the damaging effects of ultraviolet light, reducing water absorption, and slowing fungal growth on the surface. Coating performance depends on the blend of resins, oils, and pigments and varies considerably among different wood species and conditions. Specific information describing expected service for different wood species and exposure conditions is not commonly available; certain combinations may work well in one climate or on one timber species, but underperform elsewhere. This study compared the performance of three industrial wood coatings on two wood species for two temperate climates under natural weathering conditions. Most of the coatings/species combinations lost their protective properties within 12 to 15 months; however, fungal growth was more prevalent at the wetter site than at the drier site for several combinations. Film-forming coatings often peeled and cracked, while penetrating coatings weathered and changed color relatively uniformly during the study. While no coating was completely effective, the results illustrate the benefits of using coatings that promote the development of natural, uniform-patinaed wood surfaces. The findings also guide coating maintenance programs for mass timber structures exposed to natural weathering conditions.

Effect of cold plasma spray on microshear bond strength of repair composite resin in comparison with other surface treatments

2020 ◽  
pp. 1-12
Author(s):  
Sara Valizadeh ◽  
Sima Shahabi ◽  
Mohammad Zare ◽  
Marcos Daniel Septímio Lanza ◽  
Ahmad Reza Shamshiri ◽  
...  
Keyword(s):  
Bond Strength ◽  
Plasma Spray ◽  
Cold Plasma ◽  
Composite Resin ◽  
Surface Treatments ◽  
Microshear Bond Strength

scholarly journals One-Step Deposition of Polyester/TiO2 Coatings by Atmospheric Pressure Plasma Jet on Wood Surfaces for UV and Moisture Protection

Coatings ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 184 ◽  
Author(s):  
Ghiath Jnido ◽  
Gisela Ohms ◽  
Wolfgang Viöl
Keyword(s):  
Uv Radiation ◽  
Plasma Spray ◽  
Atmospheric Pressure ◽  
Atmospheric Pressure Plasma ◽  
Plasma Jet ◽  
Atmospheric Pressure Plasma Jet ◽  
Liquid Precursor ◽  
One Step ◽  
Tio2 Coatings ◽  
Wood Surfaces

In this work, polyester/TiO2 coatings on wood surfaces were prepared in one step via two deposition methods by using an atmospheric pressure plasma jet technique with the aim to further enhance the stabilization of the wood surfaces against UV-radiation and moisture. The first method, based on the combination of plasma spray powder (PSP) coating and liquid precursor plasma spraying (LPPS) coating techniques, used polyester powder and titanium tetraisopropoxide (TTIP) liquid precursor as feedstock. In the second method, the polyester/TiO2 coatings were prepared by using a mixed powder of polyester micro-particles and TiO2 nano-particles as feedstock and applied via plasma spray powder coating technique. The surface topology and morphology of the wood samples were observed by scanning electron microscopy (SEM). The SEM results showed the presence of a rough structure after coating with polyester/TiO2. The surface chemical compositions of the samples were characterized by X-ray photoelectron spectroscopy and by Fourier transform infrared spectroscopy. The wetting behaviour of the coated wood surfaces was studied by measuring the water contact angle. After coating a hydrophilic wood surface with polyester/TiO2 prepared via (PSP + LPPS), it showed excellent water repellency; the wood surfaces were transformed from hydrophilic to superhydrophobic, while the polyester/TiO2 coating prepared via (PSP) was hydrophilic. Protection against UV radiation-induced colour changes was determined by UV tests and photo-assisted analysis using the CIELab colour system. The abrasion test results indicated that the polyester-containing films had good abrasion resistance and good adhesion to the wood substrates.

scholarly journals Enhancing the water repellency of wood surfaces by atmospheric pressure cold plasma deposition of fluorocarbon film

RSC Advances ◽  
2017 ◽  
Vol 7 (46) ◽  
pp. 29159-29169 ◽  
Author(s):  
Pedro Henrique Gonzalez de Cademartori ◽  
Luc Stafford ◽  
Pierre Blanchet ◽  
Washington Luiz Esteves Magalhães ◽  
Graciela Ines Bolzon de Muniz
Keyword(s):  
Atmospheric Pressure ◽  
Cold Plasma ◽  
Plasma Deposition ◽  
Atmospheric Pressure Plasma ◽  
Water Repellency ◽  
Pressure Plasma ◽  
Wood Surfaces ◽  
Fluorocarbon Film

This study explores the fluorocarbon deposition on wood by atmospheric pressure plasma, with the focus on higher water repellency.

scholarly journals Plasma Treatment Reduced the Discoloration of an Acrylic Coating on Hot-Oil Modified Wood Exposed to Natural Weathering

Coatings ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 248 ◽  
Author(s):  
Arash Jamali ◽  
Philip D. Evans
Keyword(s):  
Contact Angle ◽  
Plasma Treatment ◽  
Water Vapour ◽  
Natural Weathering ◽  
Water Droplets ◽  
Acrylic Paint ◽  
Acrylic Coating ◽  
Bordered Pits ◽  
Wood Surfaces ◽  
Modified Wood

We test the hypothesis that plasma-treatment will remove oil from the surface of hot-oil modified blue-stained pine wood, and improve the adhesion and outdoor performance of a white acrylic coating on the modified wood. Modified wood was treated with water-vapour plasma, and microstructural changes at wood surfaces were examined. Plasma treatment removed oil from the surface of modified wood and etched bordered pits. The contact angle of water droplets on modified wood was 91.8°, but plasma-treatment for only 33 s reduced contact angle to less than that of the unmodified control (48.6°). The adhesion of the acrylic paint to modified wood was unaffected by plasma-treatment, but the adhesion rating of coated samples tested wet was slightly lower (3.1) than that of the coating on samples tested dry (3.5). The lightness value (CIE-L) of the acrylic coating on hot-oil modified wood samples exposed outdoors for 18 months was significantly lower (darker, 65.5) than that of the coating on similarly modified and exposed samples pre-treated with plasma (75.8). We conclude that plasma-treatment shows promise as a way of removing oil from the surface of hot-oil modified wood and reducing the discolouration of an acrylic coating on modified wood exposed to natural weathering.

Sign in / Sign up

Export Citation Format

Share Document