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1 Journal of Achievements in Materials and Manufacturing Engineering

1 2009

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Plasma-chemical surface engineering of wood

Sokołowska A., Szawłowski J., Frąckowiak I., Rudnicki J., Boruszewski P., Beer P., Olszyna A.

Journal of Achievements in Materials and Manufacturing Engineering

2009

Vol. 37, nr 2

694-697

Purpose: Wood infiltrated with nano-silica hydrosol forms a “weak”, irregular composite of components bound with hydrogen bonds only. The purpose of this study was to investigate the influence of low-energy ions bombardment on the structure and properties of the surface of this composite. The aim of these investigations was to produce a shallow “buried” layer of a dense wood-ceramic composite on a wood surface . Design/methodology/approach: D.c. glow-discharge in N2/H2 (9:11) atmosphere under a pressure of 4hPa was the source of ions. A beech plate was placed on the cathode. The temperature of wood was 200°C. The material collected from the wood-silica composite surface was investigated with FTIR spectroscopy and SEM observations. The surface energy was determined with the use of contact angle measurements. Findings: The ions influenced silica only. The nano-particles underwent sintering changing its medium size twice and a small I.R. peak of N2 trapped in SiO2 suggest the possibility of silica nitriding. A buried, continual surface layer of sintered silica did not form. The surface energy of the “wood-silica” plate was slightly decreased after plasma treatment. Research limitations/implications: The results proved the possibility of plasma treatment of wood even in a d.c. glow-discharge under low pressure. Silica sintering, a difficult process which in a thermal way has to be carried out at a temperature of 1000°C, taking place in a plasma at a temperature of 200°C showed the very special nature of an influence of ions. Originality/value: The plasma surface treatment of wood in the d.c. glow-discharge (GD) under reduced pressure has not been investigated. There are only publications about glow-dielectric-barrier-discharge (GDBD) at atmospheric pressure applications for wood surface modification. The energy of ions in GDBD is much smaller than that of ions in GD and therefore the application of glow discharge under reduced pressure to wood surface treatment can be more efficient.