Evaluating the quality of surface carbonized woods modified with a contact charring or a gas flame charring technique

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F62156489%3A43410%2F23%3A43924001" target="_blank" >RIV/62156489:43410/23:43924001 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.1007/s00226-023-01488-0" target="_blank" >https://doi.org/10.1007/s00226-023-01488-0</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s00226-023-01488-0" target="_blank" >10.1007/s00226-023-01488-0</a>

Result language

angličtina

Original language name

Evaluating the quality of surface carbonized woods modified with a contact charring or a gas flame charring technique

Original language description

Surface carbonization, or charring, of wooden exterior cladding boards is a modification method that creates a fully organic barrier layer in resemblance to a coating. The process effectively degrades the wood and transforms it into a carbonaceous residue that protects the underlying unmodified wood from environmental stresses. The surface quality of wood modified in this manner is a combination of several factors and depends on the manufacturing method and wood species. To assess the quality of spruce and birch modified with contact and flame charring techniques, several experiments were set up from the nanoscale to macroscopic evaluation of surface resistance to different stresses. The changes in elemental composition are scaled with the modification severity with little differences between wood species. The carbon structures analyzed by high-resolution transmission electron microscopy (HR-TEM) were found to be amorphous, but the electron energy-loss spectroscopy (EELS) revealed higher ordering with what is assumed to be random graphitic stacking of carbon sheets. These carbon-carbon bonds are stable, so a higher ordering is hypothesized to induce improved resistance to exterior stresses. The scanning electron microscopy (SEM) revealed a clear difference between contact-charred and flame-charred woods. The selected contact charring temperature was not high enough to induce the transformation of cell walls from anisotropic into an isotropic material but provided other benefits such as a relatively crack-free, smooth and scratch resistant surface. Surface roughness was able to adequately predict the surface quality of the contact-charred samples, and scratch tests were found to be suitable for evaluating the mechanical stress resistance of the surface instead of abrasion. In terms of overall quality, birch instead of spruce was concluded to better respond to both charring methods, although contact charring eliminates some species-specific characteristics, resulting in more homogeneous surfaces.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

20502 - Paper and wood

Project

—

Continuities

O - Projekt operacniho programu

Publication year

2023

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Wood Science and Technology

ISSN

0043-7719

e-ISSN

1432-5225

Volume of the periodical

57

Issue of the periodical within the volume

6

Country of publishing house

US - UNITED STATES

Number of pages

19

Pages from-to

1299-1317

UT code for WoS article

001066767600001

EID of the result in the Scopus database

2-s2.0-85171272478