@article{Yan2025, 
author = {Jing Yan and Yan Wang and Shunzo Shimai and Haohao Ji and Xiaojian Mao and Jian Zhang and Shiwei Wang},
title = {Modified low molecular weight polyacrylic acid as a dispersant for spontaneous coagulation casting of alumina ceramics},
year = {2025},
journal = {Journal of Advanced Ceramics},
volume = {14},
number = {10},
pages = {9221161},
keywords = {alumina ceramics, low sintering temperature, spontaneous coagulation casting (SCC), low-molecular-weight polyacrylic acid},
url = {https://www.sciopen.com/article/10.26599/JAC.2025.9221161},
doi = {10.26599/JAC.2025.9221161},
abstract = {Slurries with high solid loading and low apparent viscosity are critical for spontaneous coagulation casting (SCC) and other in situ slurry solidification techniques. This work evaluated polyacrylic acid (PA) with a low molecular weight modified as a superior dispersant (M–PA) to increase the versatility and applicability of SCC, which traditionally employs Isobam 600AF as a dispersant in combination with Isobam 104. Varying the ratio of M–PA to Isobam 104 increased the solid loading of the alumina slurry—formulated with a commercial powder (D50 = 0.45 μm)—from 56 to 58 vol%. The relative density of the alumina green body increased from 62.0% to 67.0%. The ceramics derived from a 56 vol% solid loading slurry, when sintered at 1550 °C, exhibited a relative density of 98.7%, a Vickers hardness of 17.3 GPa, and a flexural strength of 583 MPa, surpassing those of ceramics prepared with other dispersants. The ceramics derived from a 58 vol% solid loading slurry, when sintered at 1500 °C, exhibited a relative density of 98.9% and a Vickers hardness of 17.8 GPa. These findings demonstrate the potential of M–PA to broaden the applicability of SCC and suggest that the strategy of using a low–molecular–weight dispersant may enable the fabrication of high–density green bodies through SCC, resulting in high mechanical properties of ceramics under low sintering temperatures.}
}