Influence of CaZrO<sub>3</sub> introduction types and magnesium oxide content on properties of synthesized MgO-CaZrO<sub>3</sub> refractory materials

doi:10.13228/j.boyuan.issn1001-0963.20240214

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Journal of Iron and Steel Research ›› 2024, Vol. 36 ›› Issue (10) : 1343-1351. DOI: 10.13228/j.boyuan.issn1001-0963.20240214

Refractories Research

Influence of CaZrO₃ introduction types and magnesium oxide content on properties of synthesized MgO-CaZrO₃ refractory materials

KONG Yibo, SUI Xinyuan, WANG Zhipeng, WANG Liguang, YU Jingkun, YUAN Lei, WEN Tianpeng

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Abstract

To prepare high-performance MgO-CaZrO₃refractory materials, pre-synthesized calcium zirconate was used as the raw material, and different contents of magnesium oxide were added during the process. The effects of CaZrO₃ introduction types and magnesium oxide content on the phase composition, microstructure and physical properties were studied through techniques such as X-ray diffraction, physical property analysis, and scanning electron microscopy. The results show that the presence ofMgO promotes the transformation of calcium zirconate to the intermediate product Ca_0.15Zr_0.85O_1.85 to a certain extent. During the high-temperature sintering process, newly generated CaZrO₃ could lead to the increase in interfacial reactions and the sintering densification would be greatly improved. When the pre-synthesized CaZrO₃ was introduced as well as 30 mass% of MgO was added, the obtained MgO-CaZrO₃ refractories possessed excellent properties. For the obtained MgO-CaZrO₃ refractories, the main phases were MgO, CaZrO₃, and Ca_0.15Zr_0.85O_1.85, where the average grain size of CaZrO₃ was 1.5-2.5 μm andthat of MgO was 2.5-3.5 μm. According to the analysis of densification parameters, the apparent porosity was 2.56%, the bulk density was 3.85 g/cm³, the linear shrinkage rate was 15.43%, and the compressive strength at room temperature was 376 MPa. Correspondingly,the MgO-CaZrO₃ refractories were obtained with excellent properties when the synthesized CaZrO₃ was introduced as well as 30 mass% of MgO was added. The main phases for the prepared MgO-CaZrO₃ refractories were also MgO, CaZrO₃, and Ca_0.15Zr_0.85O_1.85. The average grain size of CaZrO₃ and MgO increased to 2-4 μm and 9-11 μm, respectively. Meanwhile, the densification also increased, where the apparent porosity was 0.90%, the bulk density was 4.87 g/cm³ and the linear shrinkage rate was 17.47%. The room-temperature compressive strength exhibited a decrease tendency with a value of 250 MPa at this time.

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calcium zirconate / magnesium oxide / MgO-CaZrO₃ refractory material / physical performance / microstructure

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KONG Yibo, SUI Xinyuan, WANG Zhipeng, WANG Liguang, YU Jingkun, YUAN Lei, WEN Tianpeng. Influence of CaZrO₃ introduction types and magnesium oxide content on properties of synthesized MgO-CaZrO₃ refractory materials[J]. Journal of Iron and Steel Research, 2024, 36(10): 1343-1351 https://doi.org/10.13228/j.boyuan.issn1001-0963.20240214

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