耐火材料 ›› 2025, Vol. 59 ›› Issue (4): 330-336.DOI: 10.3969/j.issn.1001-1935.2025.04.010

• 生产应用 • 上一篇    下一篇

含纳米CaCO3的刚玉-尖晶石浇注料显微结构及抗热震性能的研究

谭丹, 王景然, 张锦化, 倪月娥, 韩兵强   

  1. 武汉科技大学 先进耐火材料全国重点实验室 湖北武汉 430081
  • 收稿日期:2024-12-18 发布日期:2025-08-18
  • 通讯作者: 王景然,女,1986年生,博士,副教授。E-mail:wangjingran@wust.edu.cn
  • 作者简介:谭丹:女,1999年生,硕士研究生。E-mail:2919265483@qq.com
  • 基金资助:
    国家自然科学基金项目(51802235);湖北省科学技术厅2023年科技人才服务企业项目(2023DJC087);双碳背景下轻质耐火材料多功能化关键技术与应用基础研究(2021CSA075)。

Microstructure and thermal shock resistance of corundum-spinel castables containing nano-CaCO3

Tan Dan, Wang Jingran, Zhang Jinhua, Ni Yue’e, Han Bingqiang   

  1. First author's address:State Key Laboratory of Advanced Refractories,Wuhan University of Science and Technology,Wuhan 430081,Hubei,China
  • Received:2024-12-18 Published:2025-08-18

摘要: 以烧结刚玉、α-Al2O3微粉、90MA尖晶石微粉、铝酸钙水泥、电熔镁砂细粉为原料制备刚玉-尖晶石浇注料,经1 100、1 600 ℃保温3 h热处理。研究了纳米CaCO3外加量(外加质量分数分别为0、0.5%、1.0%、1.5%和2.0%)对刚玉-尖晶石浇注料显微结构、力学性能及抗热震性能的影响。结果表明:在保持各组浇注料流动性一致的情况下,随着纳米CaCO3加入量的增加,浇注料用水量逐渐增加,显气孔率逐渐增大,体积密度逐渐降低。纳米CaCO3受热分解后与基质中Al2O3原位反应生成CA2和CA6等铝酸钙相,能够提高浇注料经1 100 ℃热处理后的常温抗折强度和耐压强度,但经1 600 ℃热处理后的常温抗折和耐压强度逐渐降低。添加纳米CaCO3能够改善浇注料的抗热震性能,纳米CaCO3最佳外加量(w)为1.5%。

关键词: 纳米CaCO3, 刚玉-尖晶石浇注料, 抗热震性能, 六铝酸钙

Abstract: Corundum-spinel castables were prepared using sintered corundum,α-Al2O3 micropowder,90MA spinel micropowder,calcium aluminate cement,and fine fused magnesia powder as raw materials,then heat-treated at 1 100 and 1 600 ℃ for 3 h.The effects of nano-CaCO3 extra-additions (0,0.5%,1.0%,1.5%,and 2.0%,by mass,respectively) on the microstructure,mechanical properties,and thermal shock resistance of the corundum-spinel castables were investigated.The results show that under the condition of maintaining the consistent flowability among all groups of castables,with the nano-CaCO3 extra-addition increasing,the water consumption of castables gradually increases,the apparent porosity gradually rises,and the bulk density gradually decreases.After thermal decomposition,nano-CaCO3 in situ reacts with Al2O3 in the matrix to form calcium aluminate phases such as CA2 and CA6,which can improve the cold modulus of rupture (CMOR) and the cold crushing strength (CCS) of the castables after heat treatment at 1 100 ℃,but the CMOR and the CCS of the castables after heat treatment at 1 600 ℃ gradually decrease.Nano-CaCO3 can improve the thermal shock resistance of the castables,and the optimal nano-CaCO3 extra-addition is 1.5%.

Key words: nano-CaCO3, corundum-spinel castables, thermal shock resistance, calcium hexaluminate

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