scholarly journals Determining patterns in reducing the level of bio-destruction of thermally modified timber after applying protective coatings

2021 ◽  
Vol 5 (10 (113)) ◽  
pp. 48-55
Author(s):  
Yuriy Tsapko ◽  
Oleksandra Horbachova ◽  
Serhii Mazurchuk ◽  
Аleksii Tsapko ◽  
Kostiantyn Sokolenko ◽  
...  
Keyword(s):  
Experimental Data ◽  
Protective Coating ◽  
Protective Coatings ◽  
Environmentally Friendly ◽  
Protective Film ◽  
Timber Structures ◽  
Polymer Shell ◽  
Process Adjustment ◽  
Reliable Methods

This paper reports the analysis of the biological destruction of timber and the use of protective materials, which established that the scarcity of data to explain and describe the process of bioprotection, neglect of environmentally friendly agents lead to the biodegradation of timber structures under the action of microorganisms. Devising reliable methods for studying the conditions of timber protection leads to designing new types of protective materials and application technologies. Therefore, it becomes necessary to determine the conditions for the formation of a barrier for bacteria permeability and to establish a mechanism for inhibiting material biodegradation. Given this, the dependence has been derived to determine the proportion of destroyed material under the effect of microorganisms when using an antiseptic-hydrophobicizer, which makes it possible to evaluate biopenetration. Based on the experimental data and theoretical dependences, the share of destroyed timber was determined under the effect of microorganisms, which is equal to 1 for natural timber. At the same time, this value for thermally modified timber is 0.033, and, when it is protected with oil ‒ 0.009, respectively, exposed to the action of microorganisms for 60 days. It should be noted that the presence of oil, wax, and azure leads to blocking the timber surface from penetration. Such a mechanism underlying the effect of protective coating is likely the factor in the process adjustment, due to which the integrity of the object is preserved. Thus, a polymer shell was created on the surface of the sample, significantly reducing the penetration of microorganisms inside the timber, while the loss of timber mass during biodestruction did not exceed 2.5 %. Therefore, there are grounds to assert the possibility of targeted control over the processes of timber bio-penetration by using coatings capable of forming a protective film on the surface of the material

Assessment of Damage from Organic Protective Coating Treatments to Historic Stone Buildings and Sculptures

2010 ◽  
Vol 44-47 ◽  
pp. 610-613
Author(s):  
Qiang Liu ◽  
Bing Jian Zhang
Keyword(s):  
Protective Coating ◽  
Side Effect ◽  
Protective Coatings ◽  
Organic Coating ◽  
Stone Conservation ◽  
Silicon Compounds ◽  
Artificial Weathering ◽  
Organic Silicon ◽  
Destruction Mechanism ◽  
Historic Stone

The conservation of historic stone buildings and sculptures is receiving growing attention because of weathering. Now, the techniques for stone conservation are primarily achieved through the use of organic coating treatments. Although some defects of organic protective materials have been recognized, the further shortcoming is still short of awareness. Here we show our investigations of the side effect of organic coating treatments. Some kinds of common stones, including sandstone, tuff, granite, dolomite and marble, were selected as protected objects. Organic silicon compounds were used as protective coatings. The artificial weathering, including salting, freezing and heating, was designed. The treated stones’ decaying was investigated. The results reveal that the treated stone decaying is aggravated. Moreover, the destruction mechanism has been discussed.

The SWORFISH Project Approach for Modeling Wood Material Modifications in Timber Structures

2013 ◽  
Vol 778 ◽  
pp. 418-423
Author(s):  
Jakub Sandak ◽  
Anna Sandak ◽  
Mariapaola Riggio ◽  
Ilaria Santoni ◽  
Dusan Pauliny
Keyword(s):  
Experimental Data ◽  
Expert Knowledge ◽  
Surface Finishing ◽  
Special Focus ◽  
Original Material ◽  
Timber Structures ◽  
Wood Material ◽  
Project Approach ◽  
Special Software ◽  
Definition Of

A special software simulating changes to wood due to various processes (either treatment or degradation) has been developed within the SWORFISH (Superb Wood Surface Finishing) project. The definition of the material modifications due to processes is based on the expert knowledge and/or experimental data. The dedicated algorithm simulates material modifications (with a special focus on surface) taking into account original material characteristics (evaluated by means of NDT techniques) and setting of process parameters. In this way, it is possible to analyze the sequence of processes (i.e. material modifications) and to estimate properties of the resulting product. Two case studies are presented for illustration of the potential uses of the SWORFISH approach in the field of timber structures.

scholarly journals Ecologically safe protective coatings for transport

2019 ◽  
Vol 89 (6) ◽  
pp. 593-602
Author(s):  
V. Ya. Shevchenko ◽  
O. A. Shilova ◽  
T. A. Kochina ◽  
L. D. Barinova ◽  
O. V. Belyi
Keyword(s):  
Protective Coatings ◽  
Environmentally Friendly ◽  
Climate Impacts ◽  
Transport Infrastructure ◽  
Marine Fouling ◽  
New Methods ◽  
Russian Academy Of Sciences ◽  
Silicate Chemistry ◽  
Academy Of Sciences

Ways to protect vehicles and transport infrastructure from the effects of negative climate impacts, corrosion, icing, radiation, marine fouling, and biodestruction are considered based on scientific developments of Russian Academy of Sciences’ Institute of Silicate Chemistry. New methods and approaches to develop environmentally friendly protective coatings are considered.

Development of an environmentally friendly protective coating for the depleted uranium–0.75wt.% titanium alloy

2008 ◽  
Vol 53 (5) ◽  
pp. 2130-2134 ◽  
Author(s):  
Donald F. Roeper ◽  
Devicharan Chidambaram ◽  
Clive R. Clayton ◽  
Gary P. Halada
Keyword(s):  
Titanium Alloy ◽  
Protective Coating ◽  
Environmentally Friendly ◽  
Depleted Uranium

Development of an environmentally friendly protective coating for the depleted uranium–0.75wt% titanium alloy

2006 ◽  
Vol 51 (19) ◽  
pp. 3895-3903 ◽  
Author(s):  
Donald F. Roeper ◽  
Devicharan Chidambaram ◽  
Clive R. Clayton ◽  
Gary P. Halada ◽  
J. Derek Demaree
Keyword(s):  
Titanium Alloy ◽  
Protective Coating ◽  
Environmentally Friendly ◽  
Depleted Uranium

scholarly journals A new environmentally-friendly route to in situ form a high-corrosion-resistant nesquehonite film on pure magnesium

RSC Advances ◽  
2020 ◽  
Vol 10 (58) ◽  
pp. 35480-35489 ◽  
Author(s):  
Xianlong Cao ◽  
Quanyou Ren ◽  
Youkun Yang ◽  
Xianglong Hou ◽  
Yongbo Yan ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Environmentally Friendly ◽  
Pure Magnesium ◽  
Protective Film ◽  
High Corrosion Resistance ◽  
Corrosion Resistant ◽  
High Corrosion

A nesquehonite protective film with high corrosion resistance was prepared on pure Mg via a new environmentally-friendly in situ carbonation route.

scholarly journals Deposition of SiOxCyHz Protective Coatings on Polymer Substrates in an Industrial-Scale PECVD Reactor

Coatings ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 234 ◽  
Author(s):  
Žiga Gosar ◽  
Janez Kovač ◽  
Miran Mozetič ◽  
Gregor Primc ◽  
Alenka Vesel ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Protective Coating ◽  
Photoelectron Spectroscopy ◽  
Secondary Ion Mass Spectrometry ◽  
Protective Coatings ◽  
Plasma Reactor ◽  
Chemical Vapour ◽  
Rf Discharge ◽  
Average Roughness ◽  
Polymer Substrates

The deposition of protective coatings on aluminised polymer substrates by a plasma enhanced chemical vapour deposition PECVD technique in a plasma reactor with a volume of 5 m3 was studied. HMDSO was used as a precursor. Plasma was sustained in a capacitively coupled radiofrequency (RF) discharge powered by an RF generator operating at 40 kHz and having an adjustable output power up to 8 kW. Gaseous plasma was characterised by residual gas mass spectrometry and optical emission spectroscopy. Polymer samples with an average roughness of approximately 5 nm were mounted into the plasma reactor and subjected to a protocol for activation, metallisation and deposition of the protective coating. After depositing the protective coating, the samples were characterised by secondary ion mass spectrometry (SIMS) and X-ray photoelectron spectroscopy (XPS). The combination of various techniques for plasma and coating characterisation provided insight into the complex gas-phase and surface reactions upon deposition of the protective coatings in the industrial-size plasma reactor.

scholarly journals Structure, Oxidation Resistance, Mechanical, and Tribological Properties of N- and C-Doped Ta-Zr-Si-B Hard Protective Coatings Obtained by Reactive D.C. Magnetron Sputtering of TaZrSiB Ceramic Cathode

Coatings ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 946
Author(s):  
Ph. V. Kiryukhantsev-Korneev ◽  
A. D. Sytchenko ◽  
S. A. Vorotilo ◽  
V. V. Klechkovskaya ◽  
V. Yu. Lopatin ◽  
...  
Keyword(s):  
Magnetron Sputtering ◽  
Oxidation Resistance ◽  
Tribological Properties ◽  
Protective Coatings ◽  
Elastic Recovery ◽  
Protective Film ◽  
X Ray Diffraction ◽  
Energy Dispersion Spectroscopy ◽  
X Ray ◽  
Mechanical And Tribological Properties

Coatings in the Ta-Zr-Si-B-C-N system were produced by magnetron sputtering of a TaSi2-Ta3B4-(Ta,Zr)B2 ceramic target in the Ar medium and Ar-N2 and Ar-C2H4 gas mixtures. The structure and composition of coatings were studied using scanning electron microscopy, glow discharge optical emission spectroscopy, energy-dispersion spectroscopy, and X-ray diffraction. Mechanical and tribological properties of coatings were determined using nanoindentation and pin-on-disk tests using 100Cr6 and Al2O3 balls. The oxidation resistance of coatings was evaluated by microscopy and X-ray diffraction after annealing in air at temperatures up to 1200 °C. The reactively-deposited coatings containing from 30% to 40% nitrogen or carbon have the highest hardness up to 29 GPa and elastic recovery up to 78%. Additionally, coatings with a high carbon content demonstrated a low coefficient of friction of 0.2 and no visible signs of wear when tested against 100Cr6 ball. All coatings except for the non-reactive ones can resist oxidation up to a temperature of 1200 °C thanks to the formation of a protective film based on Ta2O5 and SiO2 on their surface. Coatings deposited in Ar-N2 and Ar-C2H4 demonstrated superior resistance to thermal cycling in conditions 20-T−20 °C (where T = 200–1000 °C). The present article compares the structure and properties of reactive and “standard-inert atmosphere” deposited coatings to develop recommendations for optimizing the composition.

Assessment of Hydroabrasive Wear Resistance of Construction Materials with Functional Coatings, which are Formed by Resource-Saving and Environmentally Friendly Technologies

2020 ◽  
Vol 864 ◽  
pp. 265-277
Author(s):  
Viacheslav Tarelnyk ◽  
Ievgen Konoplianchenko ◽  
Oksana Gaponova ◽  
Bogdan Sarzhanov
Keyword(s):  
Wear Resistance ◽  
Protective Coatings ◽  
Construction Materials ◽  
Thick Layer ◽  
Environmentally Friendly ◽  
Functional Coatings ◽  
Surface Layers ◽  
Resource Saving ◽  
Essential Components ◽  
Hydroabrasive Wear

The work presented in this paper is devoted to the formation of thick-layer wear-resistant coatings by technologies based on electrospark alloying, an example of essential components hardening for the heavy-duty processing equipment operating under hydroabrasive wear conditions. The aim of the paper is to improve the manufacturing and repairing technologies for the helical surfaces of the screws made of 65Г, 30X13 and 40X steels and corrosion-resistant stainless steel 12X18H10T. The above aim has been achieved owing to applying the new environmentally friendly technologies for the formation of the surface layers, and also due to the choice of the surface layers that are most resistant against hydroabrasive wear, which choice being provided for by conducting the comparative tests on the samples made of the above said steel grades and strengthened in various ways. The analysis results of the hydroabrasive wear resistance of the samples made of steel and provided with protective coatings is presented.

scholarly journals Gas Evolution Rates of Graphite Protective Coatings in Dependence on the Applied Solvent and Kind of Atmosphere

2016 ◽  
Vol 61 (4) ◽  
pp. 2129-2134
Author(s):  
A. Kmita ◽  
D. Drożyński ◽  
J. Mocek ◽  
A. Roczniak ◽  
J. Zych ◽  
...  
Keyword(s):  
Liquid Metal ◽  
Protective Coating ◽  
Protective Coatings ◽  
Measuring Method ◽  
Gas Evolution ◽  
Casting Method ◽  
Air Atmosphere ◽  
Two Systems ◽  
Mould Cavity

Abstract The results concerning emission of gases from two commercial graphite protective coatings for moulds and cores (water and alcoholic) are given in the hereby paper. Investigations were performed in two systems. One of the systems was corresponding to conditions occurring inside the mould cavity immediately after its pouring with liquid metal (Method 1), while the second was simulating conditions deep inside the mould at a certain distance from the casting (Method 2). Investigations were carried out in the CO2 atmosphere and in the air. The water protective coating generated 1.5 to 3 times larger volume of gases than the alcoholic coating (in dependence on the measuring method and atmosphere). The smallest differences occurred in the air atmosphere, while the largest in the CO2 atmosphere.

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