Synthesis of nano-WC from water soluble raw materials

Effects of tungsten source and synthesis atmosphere on chemical and phase structure evolution

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Abstract

The chemical synthesis of WC from water-soluble precursors was studied. Ammonium paratungstate APT, ammonium metatungstate AMT as tungsten source and glycine as a carbon source were dissolved in water and spray-dried, and thermal synthesis in Ar and Ar-4 vol-% 4H2 atmospheres was performed. In order to understand the effects of the tungsten source and atmosphere on the synthesis steps, and chemical and phase structure, thermogravimetry (TGA) with Differential Scanning Calorimetry (DSC) and mass spectrometry was used togetherwith X-ray diffractometry and chemical analysis. The eventual goal is to produce pureWC phasewithout lower carbides and on the other hand without extra unreacted carbon. Due to the better solubility and subsequently more homogeneous nucleation of WC, AMT was found to be a more suitable precursor. Using AMT and glycine, 10-100 nmsizedWCwas synthesised at 1300 °C in both atmospheres. However, extra carbon was present in the product. New insights were gained into the reaction sequences.
Original languageEnglish
Pages (from-to)65-71
JournalInternational Journal of Refractory Metals and Hard Materials
Volume50
DOIs
Publication statusPublished - 2015
MoE publication typeA1 Journal article-refereed

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Tungsten
Phase structure
Raw materials
Carbon
Glycine
Water
Amino acids
Ammonium Compounds
X ray diffraction analysis
Mass spectrometry
Carbides
Thermogravimetric analysis
Differential scanning calorimetry
Nucleation
Solubility
Chemical analysis

Keywords

  • Nano-sized WC synthesis
  • Water soluble precursors
  • Spray drying
  • ProperPart

Cite this

@article{d29283c0a52747c699fc35c70f9a84a6,
title = "Synthesis of nano-WC from water soluble raw materials: Effects of tungsten source and synthesis atmosphere on chemical and phase structure evolution",
abstract = "The chemical synthesis of WC from water-soluble precursors was studied. Ammonium paratungstate APT, ammonium metatungstate AMT as tungsten source and glycine as a carbon source were dissolved in water and spray-dried, and thermal synthesis in Ar and Ar-4 vol-{\%} 4H2 atmospheres was performed. In order to understand the effects of the tungsten source and atmosphere on the synthesis steps, and chemical and phase structure, thermogravimetry (TGA) with Differential Scanning Calorimetry (DSC) and mass spectrometry was used togetherwith X-ray diffractometry and chemical analysis. The eventual goal is to produce pureWC phasewithout lower carbides and on the other hand without extra unreacted carbon. Due to the better solubility and subsequently more homogeneous nucleation of WC, AMT was found to be a more suitable precursor. Using AMT and glycine, 10-100 nmsizedWCwas synthesised at 1300 °C in both atmospheres. However, extra carbon was present in the product. New insights were gained into the reaction sequences.",
keywords = "Nano-sized WC synthesis, Water soluble precursors, Spray drying, ProperPart",
author = "Ulla Kanerva and Juha Lagerbom and Marjaana Karhu and Anna Kronl{\"o}f and Tarja Laitinen and Erja Turunen",
note = "Project code: 80735",
year = "2015",
doi = "10.1016/j.ijrmhm.2014.12.002",
language = "English",
volume = "50",
pages = "65--71",
journal = "International Journal of Refractory Metals and Hard Materials",
issn = "0958-0611",
publisher = "Elsevier",

}

TY - JOUR

T1 - Synthesis of nano-WC from water soluble raw materials

T2 - Effects of tungsten source and synthesis atmosphere on chemical and phase structure evolution

AU - Kanerva, Ulla

AU - Lagerbom, Juha

AU - Karhu, Marjaana

AU - Kronlöf, Anna

AU - Laitinen, Tarja

AU - Turunen, Erja

N1 - Project code: 80735

PY - 2015

Y1 - 2015

N2 - The chemical synthesis of WC from water-soluble precursors was studied. Ammonium paratungstate APT, ammonium metatungstate AMT as tungsten source and glycine as a carbon source were dissolved in water and spray-dried, and thermal synthesis in Ar and Ar-4 vol-% 4H2 atmospheres was performed. In order to understand the effects of the tungsten source and atmosphere on the synthesis steps, and chemical and phase structure, thermogravimetry (TGA) with Differential Scanning Calorimetry (DSC) and mass spectrometry was used togetherwith X-ray diffractometry and chemical analysis. The eventual goal is to produce pureWC phasewithout lower carbides and on the other hand without extra unreacted carbon. Due to the better solubility and subsequently more homogeneous nucleation of WC, AMT was found to be a more suitable precursor. Using AMT and glycine, 10-100 nmsizedWCwas synthesised at 1300 °C in both atmospheres. However, extra carbon was present in the product. New insights were gained into the reaction sequences.

AB - The chemical synthesis of WC from water-soluble precursors was studied. Ammonium paratungstate APT, ammonium metatungstate AMT as tungsten source and glycine as a carbon source were dissolved in water and spray-dried, and thermal synthesis in Ar and Ar-4 vol-% 4H2 atmospheres was performed. In order to understand the effects of the tungsten source and atmosphere on the synthesis steps, and chemical and phase structure, thermogravimetry (TGA) with Differential Scanning Calorimetry (DSC) and mass spectrometry was used togetherwith X-ray diffractometry and chemical analysis. The eventual goal is to produce pureWC phasewithout lower carbides and on the other hand without extra unreacted carbon. Due to the better solubility and subsequently more homogeneous nucleation of WC, AMT was found to be a more suitable precursor. Using AMT and glycine, 10-100 nmsizedWCwas synthesised at 1300 °C in both atmospheres. However, extra carbon was present in the product. New insights were gained into the reaction sequences.

KW - Nano-sized WC synthesis

KW - Water soluble precursors

KW - Spray drying

KW - ProperPart

U2 - 10.1016/j.ijrmhm.2014.12.002

DO - 10.1016/j.ijrmhm.2014.12.002

M3 - Article

VL - 50

SP - 65

EP - 71

JO - International Journal of Refractory Metals and Hard Materials

JF - International Journal of Refractory Metals and Hard Materials

SN - 0958-0611

ER -