Surface Modification of SiC Powder with Sodium Humate: Adsorption Kinetics, Equilibrium, and Mechanism

Liu, Youxing; Liu, Jiaxiang; Yang, Tianyu

doi:10.1021/acs.langmuir.8b01696

Cited by 12 publications

(7 citation statements)

References 34 publications

(42 reference statements)

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“…Compared with other dispersants, the modified SiC slurry by SL had the lower viscosity at the same or higher solid loading. Without doubt, the dispersion of SiC powder modified by SL was the best. ,− …”

Section: Resultsmentioning

confidence: 98%

Adsorption and Dispersion Effect of Sodium Lignosulfonate on Fine SiC Particles in Aqueous Media

Zhang,

Zheng

et al. 2023

Langmuir

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This study presented a novel modification method for fine SiC powder by using sodium lignosulfonate as a dispersant. The adsorption behavior of sodium lignosulfonate on the SiC/water interface and its effect on the performance of a fine SiC slurry were systematically investigated. The adsorption results showed that sodium lignosulfonate formed monolayer adsorption on the surface of fine SiC and that the saturated adsorption capacity was 1.3263 mg/g. The adsorption reached equilibrium within 3 h and was mainly controlled by active sites on the SiC surface. The dispersion, stability, and zeta potential of modified SiC powder were improved after sodium lignosulfonate adsorption. The zeta potential of modified SiC reached a minimum value of −44.8 mV at pH 12. Modified SiC suspensions had great stability in a wider pH range of 6− 12. Modified SiC slurry with 54 vol % solid loading had a low viscosity of 173 mPa•s at pH 10. Subsequently, coarse SiC powder was added for slip casting. A mixed slurry with high solid loading (69 vol %) and low viscosity (583 mPa•s) was prepared using modified SiC and coarse SiC powders at a mass ratio of 2:3. Finally, recrystallized SiC green body with high density (2.6492 g/cm 3 ) was obtained.

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Section: Resultsmentioning

confidence: 98%

Adsorption and Dispersion Effect of Sodium Lignosulfonate on Fine SiC Particles in Aqueous Media

Zhang,

Zheng

et al. 2023

Langmuir

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“…13 It can be seen from Figure 1b that the characteristic peak of SiO 2 (1050 cm −1 ) disappears after HF etching, indicating that SiO 2 on the surface of SiC powder reacts with HF. [20][21][22] It can be seen from the zeta potential analysis that the removal of impure ions by pickling and HF etching SiO 2 , followed by calcination to form a new SiO 2 layer, is advantageous for the dispersion of SiC particles. 18,19 It can be seen from Figure 2 SEM pictures that after 2.0% HCl washing (Figure 2A), 20% HF etching ( Figure 2B), and 750°C calcination treatment ( Figure 2C), the particle size and morphology of SiC powder did not change greatly, and all of them showed irregular sheet or block structure.…”

Section: Impure Ion Analysismentioning

confidence: 99%

“…The absolute value of zeta potential reached a maximum value of 75.1 mV at pH = 11.0, indicating that the powder was easily dispersed. [20][21][22] It can be seen from the zeta potential analysis that the removal of impure ions by pickling and HF etching SiO 2 , followed by calcination to form a new SiO 2 layer, is advantageous for the dispersion of SiC particles. Therefore, the influence of SiO 2 layer on the SiC surface was further studied by the rheology.…”

Section: Almentioning

confidence: 99%

Influence of surface oxide layer of SiC powder on the rheological properties of its slurry

Gao

Wang

Zhao

et al. 2019

Int J Applied Ceramic Tech

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In this paper, the influence of surface oxide layer of SiC powder on the rheological behavior of its slurry was studied by acid washing, HF etching, and calcination oxidation processes. Zeta potential, particle size, inductively coupled plasma atomic emission spectrometry (ICP‐AES), energy dispersive X‐ray spectroscopy, and viscosity tests indicated the main factor that resulted in high viscosity of slurry is impure ions existing either on the powder surface or in the water phase, rather than the surface oxide layer. After the impure ions are removed, the surface oxide layer formed at a calcination temperature range of 400°C‐750°C does not cause an increase in the slurry viscosity, but contributes to an improvement in the rheological properties of SiC slurry.

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“…In addition, sodium humate is an organic polymer compound that is easily soluble in water and contains functional groups such as benzene rings and carboxyl groups. It has a wide range of applications in the fields of medicine and surface modification [28].…”

Section: Introductionmentioning

confidence: 99%

Influence of Silane Coupling Agent and Anionic Dispersant on the Dispersion Effect of Silicon Carbide Particles

Zheng,

Li,

Zhang

et al. 2024

Materials

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Silicon carbide (SiC), as a widely used material, has great properties. To improve the flowability of ultrafine silicon carbide slurry, this study used sodium humate, tetramethylammonium hydroxide (TMAH), and N-(β-monoaminoethyl)-γ-aminopropyltrimethyl(ethoxysilane) (KH792) to modify the ultrafine silicon carbide powder produced by Qingzhou Micro Powder Company. The effects of different modifiers on improving the flowability of ultrafine silicon carbide slurry were investigated by means of viscosity tests, sedimentation experiments, and SEM observations. Their modification mechanisms were investigated by means of zeta potential tests, XPS tests, and so on. In this paper, the initial modification of SiC was carried out with KH792, followed by the secondary modification with anionic and cationic modifiers (tetramethylammonium hydroxide and sodium humate), and the optimal modification conditions were investigated by means of a viscosity test, which showed that the lowest viscosity of the modified SiC reached 0.076 Pa·s and that the absolute maximum value of the zeta potential increased from 47.5 at the time of no modification to 63.7 (maximum values) at the time of modification. This means it has an improved surface charge, which improves dispersion. The adsorption results of the modifier on the silicon carbide surface were also demonstrated by the XPS test results.

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Surface Modification of SiC Powder with Sodium Humate: Adsorption Kinetics, Equilibrium, and Mechanism

Cited by 12 publications

References 34 publications

Adsorption and Dispersion Effect of Sodium Lignosulfonate on Fine SiC Particles in Aqueous Media

Adsorption and Dispersion Effect of Sodium Lignosulfonate on Fine SiC Particles in Aqueous Media

Influence of surface oxide layer of SiC powder on the rheological properties of its slurry

Influence of Silane Coupling Agent and Anionic Dispersant on the Dispersion Effect of Silicon Carbide Particles

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