Preparation and processing optimization of magnesium-calcium refractory aggregates

IF 2.3 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS

International Journal of Applied Ceramic Technology Pub Date : 2025-07-26 DOI:10.1111/ijac.70023

Kaiyue Meng, Xiaowen Wu, Ligang Zheng, Lingxue Wang, Xin Min, Minghao Fang, Zhaohui Huang

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Abstract

Magnesium-calcium refractory aggregates with a low water absorption rate were prepared by using high-temperature sintering of light-burned dolomite, magnesite, with polyvinyl alcohol as the binder. The effects of CaO content, slaking process, and sintering parameters on the microstructure and properties were thoroughly investigated. When the CaO content was 40 wt%, light-burned dolomite was slaked with the addition of 30 wt% water for 2 h, followed by sintering at 1600°C for 3 h, the overall properties of the magnesium-calcium refractory aggregates were optimal, achieving a linear shrinkage rate of 20.93%, a bulk density of 3.32 g/cm³, an apparent porosity of 5.02%, compressive strength of 213.73 MPa, flexural strength of 86.84 MPa, and a residual strength retention ratio of 92.12% after three thermal shocks. Additionally, the absorption rate was low at 0.52% after treatment for 72 h at constant temperature and humidity (RH = 99%, T = 21°C).

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镁钙耐火骨料的制备及工艺优化

以轻烧白云石、菱镁矿为原料，以聚乙烯醇为粘结剂，高温烧结制备了低吸水率的镁钙耐火骨料。研究了CaO含量、熟化工艺和烧结参数对合金组织和性能的影响。曹内容40 wt %时,轻质煅烧白云石水化的30 wt %用水2 h,其次是烧结在1600°C 3 h,整个magnesium-calcium耐火骨料的性能最优,实现线性收缩率为20.93%,体积密度3.32克/立方厘米,一个明显的孔隙度为5.02%,抗压强度为213.73 MPa, 86.84 MPa,挠曲强度和残余强度保持率92.12%,此前三个热冲击。在恒温恒湿条件下（RH = 99%, T = 21℃）处理72 h，吸收率较低，为0.52%。

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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;