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Effects of low-melting-point sintering aid MoO3 on the performance of SiC ceramic membrane supports and the underlying mechanisms

烧结 陶瓷 材料科学 熔点 陶瓷膜 复合材料 冶金 化学 生物化学
作者
Yan Liang,Yongqing Wang,Junjie Qian,Li Liu,Yulong Yang,Mingmin Bai,Haotian Zheng
出处
期刊:Journal of Alloys and Compounds [Elsevier BV]
卷期号:1027: 180675-180675 被引量:3
标识
DOI:10.1016/j.jallcom.2025.180675
摘要

Silicon carbide (SiC) ceramic membrane supports, as critical components of ceramic membrane filters , must exhibit outstanding performance in mechanical properties, porosity, and chemical stability. In this study, MoO₃ was employed as a sintering aid , with SiC and α-Al₂O₃ serving as raw materials and walnut shell powder as a pore-forming agent. The effects of varying sintering temperatures (1250–1400°C) and MoO₃ contents on the properties of SiC porous ceramic membrane supports were systematically investigated. Special emphasis was placed on elucidating the mechanisms by which MoO₃ addition influences porosity, flexural strength , pore size distribution , and chemical stability. Experimental results demonstrate that the introduction of MoO₃ facilitates low-temperature sintering of SiC supports through a dissolution-precipitation mechanism. This process promotes the formation of mullite whiskers that reinforce interparticle necking regions while enhancing the uniformity of neck connections. Optimal performance was achieved at 1350°C with 8 wt% MoO₃ addition, yielding a bending strength of 37.01 ± 1.72 MPa, average pore size of 1.735 μm, most probable pore size of 1.7 μm, open porosity of 39.12 %, and exceptional corrosion resistance . This work establishes both theoretical foundations and practical strategies for low-temperature fabrication of high-performance SiC porous ceramics, while expanding the application potential of molybdenum-based sintering aids in structure-function integrated ceramic materials. • Low-temperature sintering enabled by MoO₃: The use of MoO₃ as sintering aid significantly reduces the sintering temperature of SiC ceramic membrane supports. • In-situ mullite whisker formation: MoO₃ promotes the in-situ generation of mullite whiskers through a dissolution-precipitation mechanism. • Mechanistic insights and practical applications: The role of MoO₃ in SiC ceramic membrane is described, offering a cost-effective and scalable strategy for industrial applications.
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