Tribology and mechanical performance of Al2O3/CaF2 self-lubricating ceramics prepared by gelcasting

IF 5.6 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International Pub Date : 2025-06-01 DOI:10.1016/j.ceramint.2025.02.223

Xianggang Liu , Hui Chen , Yuxin Zhao , Jingjie Zhang , Xianglong Meng , Guangchun Xiao , Zhaoqiang Chen , Mingdong Yi , Wenyu Liu , Chonghai Xu

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Abstract

Al₂O₃/CaF₂ self-lubricating ceramic materials were prepared using a low-toxicity methylacrylamide gelcasting system. The rheological properties of the Al₂O₃ slurry were analyzed to study the effects of dispersant content, solid loading, and pH on its flowability. Optimal results were achieved with a dispersant content of 0.5 wt%, a solid loading of 54 vol%, and a pH of 9. The relative density of the resulting green body was 56 %, with a strength of 18.2 MPa. After sintering for 2 h in a vacuum furnace at 1650 °C, the material exhibited a hardness exceeding 750 HV and a bending strength above 300 MPa when the CaF₂ content was less than 10 vol%. Additionally, the tribological properties of Al₂O₃/CaF₂ under various conditions were investigated, revealing optimal performance at a CaF₂ content of 10 vol%. The average friction coefficient and wear rate were 0.245 and 2.96 × 10⁻⁵ mm³/N⋅m, respectively, representing reductions of 48 % and 54 % compared to pure Al₂O₃ materials. These findings demonstrate that gelcasting is an effective method for preparing self-lubricating ceramic materials, offering a new approach for fabricating complex-shaped self-lubricating ceramic components.

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凝胶铸造制备Al2O3/CaF2自润滑陶瓷的摩擦学及力学性能

采用低毒甲基丙烯酰胺凝胶浇注体系制备了Al2O3/CaF2自润滑陶瓷材料。通过对Al2O3浆料流变特性的分析，研究分散剂含量、固相负荷和pH对浆料流动性的影响。当分散剂含量为0.5 wt%，固体负荷为54 vol%， pH为9时，获得了最佳效果。所得绿体的相对密度为56%，强度为18.2 MPa。在1650℃真空炉中烧结2h后，当CaF2含量小于10 vol%时，材料的硬度超过750 HV，抗弯强度在300 MPa以上。此外，研究了不同条件下Al2O3/CaF2的摩擦学性能，发现CaF2含量为10 vol%时性能最佳。平均摩擦系数和磨损率分别为0.245和2.96 × 10−5 mm3/N·m，与纯Al2O3材料相比分别降低了48%和54%。研究结果表明，凝胶铸造是制备自润滑陶瓷材料的有效方法，为复杂形状自润滑陶瓷元件的制备提供了新的途径。

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来源期刊

Ceramics International 工程技术-材料科学：硅酸盐

CiteScore

9.40

自引率

15.40%

发文量

4558

审稿时长

25 days

期刊介绍： Ceramics International covers the science of advanced ceramic materials. The journal encourages contributions that demonstrate how an understanding of the basic chemical and physical phenomena may direct materials design and stimulate ideas for new or improved processing techniques, in order to obtain materials with desired structural features and properties. Ceramics International covers oxide and non-oxide ceramics, functional glasses, glass ceramics, amorphous inorganic non-metallic materials (and their combinations with metal and organic materials), in the form of particulates, dense or porous bodies, thin/thick films and laminated, graded and composite structures. Process related topics such as ceramic-ceramic joints or joining ceramics with dissimilar materials, as well as surface finishing and conditioning are also covered. Besides traditional processing techniques, manufacturing routes of interest include innovative procedures benefiting from externally applied stresses, electromagnetic fields and energetic beams, as well as top-down and self-assembly nanotechnology approaches. In addition, the journal welcomes submissions on bio-inspired and bio-enabled materials designs, experimentally validated multi scale modelling and simulation for materials design, and the use of the most advanced chemical and physical characterization techniques of structure, properties and behaviour. Technologically relevant low-dimensional systems are a particular focus of Ceramics International. These include 0, 1 and 2-D nanomaterials (also covering CNTs, graphene and related materials, and diamond-like carbons), their nanocomposites, as well as nano-hybrids and hierarchical multifunctional nanostructures that might integrate molecular, biological and electronic components.