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@article{639124,
author = {Holá, Markéta and Otruba, Vítzslav and Kanický, Viktor},
article_location = {Amsterdam},
article_number = {5},
keywords = {Laser ablation; Inductively coupled plasma; Atomic emission spectrometry; Tungsten carbide; Powdered sample},
language = {eng},
issn = {0584-8547},
journal = {Spectrochimica Acta Part B: Atomic Spectroscopy},
title = {Influence of binders on infrared laser ablation of powdered tungsten carbide pressed pellets in comparison with sintered tungsten carbide hardmetals studied by inductively coupled plasma atomic emission spectrometry},
volume = {61/2006},
year = {2006}
}
TY - JOUR
ID - 639124
AU - Holá, Markéta - Otruba, Vítzslav - Kanický, Viktor
PY - 2006
TI - Influence of binders on infrared laser ablation of powdered tungsten carbide pressed pellets in comparison with sintered tungsten carbide hardmetals studied by inductively coupled plasma atomic emission spectrometry
JF - Spectrochimica Acta Part B: Atomic Spectroscopy
VL - 61/2006
IS - 5
SP - 465-596
EP - 465-596
PB - Elsevier
SN - 05848547
KW - Laser ablation
KW - Inductively coupled plasma
KW - Atomic emission spectrometry
KW - Tungsten carbide
KW - Powdered sample
N2 - Laser ablation (LA) was studied as a sample introduction technique for the analysis of powdered and sintered tungsten carbides (WC/Co) by inductively coupled plasma optical emission spectrometry (ICPOES). The possibility to work with powdered and compact materials with close chemical composition provided the opportunity to compare LA sampling of similar substances in different forms that require different preparation procedures. Powdered WC/Co precursors of sintered hardmetals were prepared for the ablation as pressed pellets with and without powdered silver as a binder, while sintered hardmetal blocks were embedded into a resin to obtain discs, which were then smoothed and polished. A Q-switched Nd: YAG laser operated at its fundamental wavelength of 1064 nm with a pulse frequency of 10 Hz and maximum pulse energy of 220 mJ was used. A single lens was used for the laser beam focusing. An ablation cell (14 cm3) mounted on a PC-controlled XY-translator was connected to an ICP spectrometer Jobin Yvon 170 Ultrace (laterally viewed ICP, mono- and polychromator) using a 1.5-m tubing (4 mm i.d.). Ablation was performed in a circular motion (2 mm diameter). Close attention was paid to the study of the crater parametres depending on hardness, cohesion and Ag binder presence in WC/Co samples. The influence of the Co content on the depth and structure of the ablation craters of the binderless pellets was also studied. Linear calibration plots of Nb, Ta and Ti were obtained for cemented WC/Co samples, binderless and binder-containing pellets. Relative widths of uncertainty intervals about the centroids vary between š3% and š7%, and exceptionally reach a value above 10%. The lowest determinable quantities (LDQ) of Nb, Ta and Ti calculated from the calibration lines were less than 0.5% (m/m). To evaluate the possibility of quantitative elemental analysis by LAICPOES, two real sintered WC/Co samples and two real samples of powdered WC/Co materials were analysed. The results of LAICPOES real sample analysis correlated well with the results obtained by X-ray fluorescence (sintered samples) and pneumatic nebulization inductively coupled plasma optimal emmission spectrometry (powdered samples) with a bias not exceeding 6.5%.
ER -
HOLÁ, Markéta, Vítzslav OTRUBA a Viktor KANICKÝ. Influence of binders on infrared laser ablation of powdered tungsten carbide pressed pellets in comparison with sintered tungsten carbide hardmetals studied by inductively coupled plasma atomic emission spectrometry. \textit{Spectrochimica Acta Part B: Atomic Spectroscopy}. Amsterdam: Elsevier, 2006, roč.~61/2006, č.~5, s.~465-596, 12 s. ISSN~0584-8547.
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