Journal
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
Volume 567, Issue -, Pages 63-68Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.colsurfa.2019.01.044
Keywords
Ultra-fine WC powders; Dispersion; Chemical modification; Physical means
Categories
Funding
- National Development and Reform Commission [20121743]
- Fundamental Research Funds for the Central Universities of Central South University [2017zzts110]
- Project of Innovation-Driven Plan in Central South University [51271203]
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The dispersion of WC particles is critical to the microstructures and properties of WC-based alloys. The ultra-fine WC powders were uniformly dispersed in aqueous media via sodium dodecyl sulfate (SDS) with physical means. The influence of dispersion conditions such as concentration of dispersant, dispersion time and solid-liquid ratio on the powders dispersion was investigated by sedimentation test in present work. The particle size and distribution of WC powders, phase analysis and microstructure were characterized by the laser particle size analyzer, X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and Transmission electron microscope (TEM) and Zeta potential respectively. The results show that SDS was adsorbed and scattered on the WC powders, which could enhance the stability and dispersibility of suspension by the electrostatic effect. The diameter of dispersed WC powders ranged from 0.2 to 0.8 mu m. The corresponding dispersive mechanisms of SDS were electrostatic repulsion and static hindrance, which kept the dispersibility and stability of the suspension. Furthermore, the optical dispersing time, solid-liquid ratio and the concentration of SDS for the dispersed WC powders in this work is 3 h, 1:50 and 1.44 g/L, respectively.
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