原位生成六铝酸钙对刚玉质多孔材料结构和性能的影响

熊鑫; 王周福; 王玺堂; 刘浩; 马妍

doi:10.19591/j.cnki.cn11-1974/tf.2019.06.002

原位生成六铝酸钙对刚玉质多孔材料结构和性能的影响

doi: 10.19591/j.cnki.cn11-1974/tf.2019.06.002

武汉科技大学省部共建耐火材料与冶金国家重点实验室, 武汉 430081

基金项目:

国家自然科学基金资助项目 51474166

国家自然科学基金资助项目 51672195

国家重点研发计划资助项目 2017YFB0310701

详细信息

通讯作者:
王周福, E-mail: whwangzf@163.com

中图分类号: TQ175.7
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出版历程
- 收稿日期: 2018-10-24
- 刊出日期: 2019-12-27

Effect of in-situ synthesized calcium hexaluminate on the structure and properties of porous corundum materials

The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China

More Information

Corresponding author: WANG Zhou-fu, E-mail: whwangzf@163.com

摘要

摘要: 为解决多孔透气材料力学强度与透气性能两者之间的矛盾, 以纯铝酸钙水泥为钙源, 在刚玉质多孔材料中原位生成六铝酸钙相, 研究了六铝酸钙生成量对多孔材料显微结构、物相组成及物理性能的影响。结果表明: 在1700℃保温3 h处理后, 添加纯铝酸钙水泥的试样中均有板状片六铝酸钙生成。当纯铝酸钙水泥添加量(质量分数)不超过3%时, 六铝酸钙的原位生成不仅提高了多孔材料的常温耐压强度和高温抗折强度(1400℃保温0.5 h), 还能改善材料的透气性能; 继续增加纯铝酸钙水泥的加入量, 多孔材料的上述性能降低。当纯铝酸钙水泥添加量(质量分数)为3%时, 试样常温耐压强度为33.6 MPa, 高温抗折强度为6.2 MPa, 达西渗流系数及非达西渗流系数分别为2.54×10^-10 m²和1.46×10^-6 m。
- 多孔材料 /
- 原位生成 /
- 六铝酸钙 /
- 力学强度 /
- 透气性能
Abstract: To balance the contradiction of mechanical strength and air permeability of porous corundum materials, the calcium hexaluminate was in-situ synthesized in the porous materials by using pure calcium aluminate cement as the calcium source. The effects of in-situ synthesized calcium hexaluminate on the microstructure, phase composition, and mechanical properties of the porous corundum materials were investigated. The results show that, the plate-like calcium hexaluminate particles can be in-situ synthesized in the specimens added with pure calcium aluminate cement after treated at 1700 for 3 h. When the mass fraction of pure calcium℃aluminate cement is no more than 3%, the in-situ synthesized calcium hexaluminate not only improves the cold compressive strength and the high-temperature bending strength (1400℃×0.5 h) of the porous material, but also improves the air permeability of specimens. With further increase of pure calcium aluminate cement additions, the above properties of the specimens turn to a reversed trend. The cold compressive strength of specimen added with 3% pure calcium aluminate cement by mass is 33.6 MPa, the highest high-temperature bending strength is 6.2 MPa, and the Darcian permeability and non-Darcian permeability constant are 2.54×10^-10 m²and 1.46×10^-6 m, respectively.
- porous materials /
- in-situ synthesis /
- calcium hexaluminate /
- mechanical strength /
- air permeability

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图 1 1700 ℃保温3 h烧成试样的X射线衍射分析

Figure 1. X-ray diffraction analysis of samples treated at 1700 ℃ for 3 h (C0~C7)

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图 2 烧成试样扫描电子显微形貌：（a）C0；（b）C1；（c）C3；（d）图（c）中Ca元素能谱分析；（e）C5；（f）C7

Figure 2. SEM morphology of the sintering specimens: (a) C0; (b) C1; (c) C3; (d) energy spectrum analysis of Ca in Fig. 2(c); (e) C5; (f) C7

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图 3 C7试样显微形貌（a）及其局部放大图（b）

Figure 3. SEM morphology of C7 (a) and the higher magnification micrograph (b)

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图 4 添加不同纯铝酸钙水泥试样的孔径分布：（a）气孔分布频率^[13]；（b）累积孔径分布

Figure 4. Pore size distribution of the specimens added with different pure calcium aluminate cement: (a) pore frequency distribution^[13]; (b) cumulative distribution of pore diameter

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图 5 各试样压力损失与气体流速曲线图^[13]（a）及其局部放大图（b）

Figure 5. Relationship between the pressure loss and airflow rate of specimens added with different pure calcium aluminate cement at room temperature^[13] (a) and the partial enlarged detail (b)

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表 1 烧成试样的物理性能

Table 1. Physical properties of the sintering specimens

试样编号	线变化率/ %	体积密度/ (g·cm^-3)	显气孔率/ %	耐压强度/ MPa	高温抗折强度/ MPa
C0	-0.43 ± 0.03	2.74 ± 0.01	27.8 ± 0.1	32.1 ± 1.1	5.8 ± 0.3
C1	-0.36 ± 0.02	2.74 ± 0.02	27.1 ± 0.2	34.0 ± 0.7	6.0 ± 0.2
C3	-0.31 ± 0.03	2.71 ± 0.02	27.5 ± 0.2	33.6 ± 0.6	6.2 ± 0.2
C5	-0.19 ± 0.02	2.69 ± 0.01	27.8 ± 0.1	24.5 ± 1.5	5.8 ± 0.3
C7	-0.05 ± 0.01	2.67 ± 0.02	28.4 ± 0.3	22.8 ± 2.0	5.4 ± 0.5

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表 2 图 3（b）中各微区能谱分析结果

Table 2. Energy spectrum analysis of each zones in Fig. 3(b)

图 3（b）能谱选区	原子数分数/ %
图 3（b）能谱选区	Al	O	Ca
1	39.12	57.73	3.15
2	39.94	58.76	1.31
3	39.98	60.02	—

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表 3 渗流曲线基于Forchheimer’s方程的拟合结果

Table 3. Polynomial fitting results of Forchheimer's equation

试样编号	k₁ / (×10^-10m²)	k₂ / (×10^-6m)	R²
C0	2.27	1.41	0.9998
C1	2.40	1.42	0.9998
C3	2.54	1.46	0.9998
C5	2.51	1.45	0.9999
C7	2.23	1.40	0.9998

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