Binary anorthite-cordierite ceramic composite from kaolin and dolomite rock with improved characteristics

IF 1.8 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS International Journal of Applied Ceramic Technology Pub Date : 2024-06-14 DOI:10.1111/ijac.14826

Alexey Ponaryadov, Olga Kotova, Shiyong Sun, Elena Kotova

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Abstract

Binary CaO-MgO-Al₂O₃-SiO₂ (CMAS) ceramics composites of anorthite-cordierite composition were synthesized from natural raw materials (kaolin and dolomite rock). The change of SiO₂/Al₂O₃ ratio in kaolin/dolomite mixtures (12, 24, and 36 wt.%) and synthesized composites along with analysis of their phase composition transformations (X-ray diffraction) during heat treatment (thermogravimetric and differential thermal analysis) give the controlled design of aluminosilicate matrices. The obtained ceramic composites are represented by anorthite, a cordierite-like phase whose ratio varies from 1.3:1 to 2.8:1. Mullite crystals, also included in the composition, reinforce the anorthite-cordierite matrix. The morphostructural features of the samples were studied using optical and scanning electron microscopy. The porosity ranges from 7.8% to 24.2% depending on dolomite content. The impurities of iron and titanium interfering with obtaining a qualitative product are leveled by the presented technique including the heat treatment scheme justified by thermogravimetric analysis. Obtained CMAS-ceramics of anorthite-cordierite composition correspond to industrial international standards by their technical characteristics and exceed the requirements for heat-insulating and chemically resistant materials by compressive strength.

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具有更好特性的高岭土和白云石二元正长石-堇青石陶瓷复合材料

利用天然原料（高岭土和白云石）合成了阳起石-堇青石成分的二元 CaO-MgO-Al2O3-SiO2 （CMAS）陶瓷复合材料。高岭土/白云石混合物（12、24 和 36 wt.%）和合成复合材料中 SiO2/Al2O3 比例的变化，以及热处理（热重分析和差热分析）过程中相组成转变（X 射线衍射）的分析，为铝硅酸盐基质的可控设计提供了依据。所获得的陶瓷复合材料以堇青石为代表，堇青石是一种类似堇青石的相，其比例从 1.3:1 到 2.8:1 不等。莫来石晶体也包含在成分中，可强化正长石-堇青石基体。使用光学和扫描电子显微镜研究了样品的形态结构特征。根据白云石含量的不同，孔隙率从 7.8% 到 24.2% 不等。通过所介绍的技术，包括通过热重分析证明合理的热处理方案，消除了影响获得优质产品的铁和钛杂质。所获得的正长石-堇青石成分的 CMAS 陶瓷在技术特性上符合国际工业标准，在抗压强度上超过了隔热和耐化学材料的要求。

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来源期刊

International Journal of Applied Ceramic Technology 工程技术-材料科学：硅酸盐

CiteScore

3.90

自引率

9.50%

发文量

280

审稿时长

4.5 months

期刊介绍： The International Journal of Applied Ceramic Technology publishes cutting edge applied research and development work focused on commercialization of engineered ceramics, products and processes. The publication also explores the barriers to commercialization, design and testing, environmental health issues, international standardization activities, databases, and cost models. Designed to get high quality information to end-users quickly, the peer process is led by an editorial board of experts from industry, government, and universities. Each issue focuses on a high-interest, high-impact topic plus includes a range of papers detailing applications of ceramics. Papers on all aspects of applied ceramics are welcome including those in the following areas: Nanotechnology applications; Ceramic Armor; Ceramic and Technology for Energy Applications (e.g., Fuel Cells, Batteries, Solar, Thermoelectric, and HT Superconductors); Ceramic Matrix Composites; Functional Materials; Thermal and Environmental Barrier Coatings; Bioceramic Applications; Green Manufacturing; Ceramic Processing; Glass Technology; Fiber optics; Ceramics in Environmental Applications; Ceramics in Electronic, Photonic and Magnetic Applications;