Synthesis of Hierarchical Layered Quasi-Triangular Ce(OH)CO(3) and Its Thermal Conversion to Ceria with High Polishing Performance.
Synthesis of Hierarchical Layered Quasi-Triangular Ce(OH)CO(3) and Its Thermal Conversion to Ceria with High Polishing Performance.
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DOI：
10.1021/acsomega.2c07682
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发表时间：
2023-03-07
期刊：
影响因子：
4.1
通讯作者：
Liao, Yuanyuan
中科院分区：
文献类型：
--
作者：
Li, Jing;Li, Yongxiu;He, Rucheng;Guo, Guihua;Li, Yao;Liao, Yuanyuan
通过溶剂热法合成了由初级纳米颗粒组装的层状准三角形Ce（OH）CO 3，并通过在800-1000 °C煅烧将其转化为CeO 2磨料颗粒。随着煅烧温度的升高，CeO 2颗粒的一次粒径增大，微观结构、机械硬度和化学活性发生变化，从而影响抛光性能。在800、850和900 °C下获得的煅烧产物保持了Ce（OH）CO 3前体的层状边缘结构，并且具有相对高的比表面积和表面Ce 3+浓度。在950和1000 °C下煅烧的样品由于初级颗粒的大规模熔融而失去层状结构，其表面化学活性降低。对K9玻璃的抛光实验表明，随着煅烧温度从800 °C升高到1000 °C，材料去除率（MRR）先增大后急剧减小。MRR的初始增加归因于层状准三角形CeO 2的机械硬度的增加，并且随后的MRR的降低与表面化学活性的降低和层状边缘结构的消失有关。在900 °C下煅烧的产物具有最高的MRR和抛光后的最佳表面质量，这是由于层状边缘结构以及化学活性和机械硬度的最佳匹配。
Layered quasi-triangular Ce(OH)CO3 assembled from primary nanoparticles was synthesized via a solvothermal method and converted into CeO2 abrasive particles by calcination at 800–1000 °C. With the increase of calcination temperature, the primary particle size increased and the microstructure, mechanical hardness, and chemical activity of the CeO2 particles changed, thus affecting the polishing performance. The calcined products obtained at 800, 850, and 900 °C maintained the layered edge structure of the Ce(OH)CO3 precursor and had a relatively high specific surface area and surface Ce3+ concentration. The samples calcined at 950 and 1000 °C lost the layered structure due to the large-scale melting of the primary particles, and their surface chemical activity decreased. The polishing experiments on K9 glass showed that, with the calcination temperature rising from 800 to 1000 °C, the material removal rate (MRR) first increased and then decreased sharply. The initial increase of MRR was attributed to the increase of mechanical hardness of the layered quasi-triangular CeO2, and the subsequent decrease of MRR was related to the decrease in surface chemical activity and disappearance of the layered edge structure. The product calcined at 900 °C had the highest MRR and best surface quality after polishing due to the layered edge structure and optimal match of chemical activity and mechanical hardness.
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