Studium vlivu spojiva na nanosekundovou laserovou ablaci v případě wolfram karbidového prášku

Tungsten carbide precursors as an example for influence of a binder on the particle formation in the nanosecond laser ablation of powdered materials

článek v časopise - ostatní, Jost

en

A study of LA ICP MS analysis of pressed powdered tungsten carbide precursors was performed to show the advantages and problems of nanosecond laser ablation of matrix-unified samples. Five samples with different compositions were pressed into pellets both with silver powder as a binder serving to keep the matrix unified, and without any binder. The laser ablation was performed by nanosecond Nd:YAG laser working at 213 nm. The particle formation during ablation of both sets of pellets was studied using an optical aerosol spectrometer allowing the measurement of particle concentration in two size ranges (10 to 250 nm and 0.25 to17 mikrons) and particle size distribution in the range of 0.25 to17 mikrons. Additionally, the structure of the laser-generated particles was studied after their collection on a filter using a scanning electron microscope (SEM) and the particle chemical composition was determined by an energy dispersive X-ray spectroscope (EDS). The matrix effect was proved to be reduced using the same silver powdered binder for pellet preparation in the case of the laser ablation of powdered materials. The LA ICP MS signal dependence on the element content present in the material showed an improved correlation for Co, Ti, Ta and Nb of the matrix-unified samples compared to the non-matrix-unified pellets. In the case of W, the ICP-MS signal of matrix-unified pellets was influenced by the changes in the particle formation.

Analýza pěti různých tablet lisovaných z wolfram karbidového prášku byla využita k diskuzi výhod a nevýhod LA-ICP-MS techniky při analýze vzorků s unifikovanou matricí. Ablatovaný materiál byl studován pomocí spektrometru pro měření velikosti aerosolů, SEM a EDS.

A study of LA ICP MS analysis of pressed powdered tungsten carbide precursors was performed to show the advantages and problems of nanosecond laser ablation of matrix-unified samples. Five samples with different compositions were pressed into pellets both with silver powder as a binder serving to keep the matrix unified, and without any binder. The laser ablation was performed by nanosecond Nd:YAG laser working at 213 nm. The particle formation during ablation of both sets of pellets was studied using an optical aerosol spectrometer allowing the measurement of particle concentration in two size ranges (10 to 250 nm and 0.25 to17 mikrons) and particle size distribution in the range of 0.25 to17 mikrons. Additionally, the structure of the laser-generated particles was studied after their collection on a filter using a scanning electron microscope (SEM) and the particle chemical composition was determined by an energy dispersive X-ray spectroscope (EDS). The matrix effect was proved to be reduced using the same silver powdered binder for pellet preparation in the case of the laser ablation of powdered materials. The LA ICP MS signal dependence on the element content present in the material showed an improved correlation for Co, Ti, Ta and Nb of the matrix-unified samples compared to the non-matrix-unified pellets. In the case of W, the ICP-MS signal of matrix-unified pellets was influenced by the changes in the particle formation.

Laser ablation (LA); Inductively coupled plasma mass spectrometry (ICP-MS); Powder; Matrix effect; Fractionation; Binder; Particle size distribution

2010

24.10.2009

0039-9140

Talanta

80

1

1862–1867

6