Chemical Industry and Engineering Progress ›› 2020, Vol. 39 ›› Issue (S1): 200-205.DOI: 10.16085/j.issn.1000-6613.2020-0335

• Materials science and technology • Previous Articles     Next Articles

Promoting law and mechanism of TiO2 addition on sintering of CaAl4O7 refractory

Xueliang YIN1(), Heli MA1, Changwei GONG1, Chengwu DU1(), Tingquan HAN2   

  1. 1.School of Metallurgy, Liaoning Institute of Science and Technology, Benxi 117000, Liaoning, China
    2.Iron-making Plant of Benxi Iron & Steel (Group) Co. , Ltd. , Benxi 117000, Liaoning, China
  • Received:2020-03-09 Online:2020-06-29 Published:2020-05-20
  • Contact: Chengwu DU

TiO2促进CaAl4O7材料烧结规律及其机理

尹雪亮1(), 马贺利1, 宫长伟1, 杜成武1(), 韩廷全2   

  1. 1.辽宁科技学院冶金工程学院,辽宁 本溪 117000
    2.本钢集团炼铁厂,辽宁 本溪 117000
  • 通讯作者: 杜成武
  • 作者简介:尹雪亮(1980—),男,讲师,博士,研究方向为化工材料。E-mail:yxliang1007@163.com
  • 基金资助:
    辽宁省教育厅项目(L2019lkyjc-03);辽宁科技学院博士启动基金(1810B04);国家级大学生创新创业训练计划(201911430066);辽宁科技学院大学生创新创业训练计划(202011430079);辽宁省科技厅省博士科研启动基金(2020)

Abstract:

In order to adapt the demands for the lightweight, economic and functional materials, CA2 material was prepared by two steps reaction and sintering of mixture powders method after the mixture powders of Al2O3 and CaCO3 was pre-sintering at 1200℃ for 2h and sintering at 1600℃ for 1h by addition of TiO2 micro powder, and the promoting law and mechanism of TiO2 addition on sintering of thisrefractory was discussed.The results showed that the added Ti4+ dissolves to CA2 by substituting Al3+, which effectively promotes the lattice distortion of CA2 and increases the Al3+ vacancies, and then effectively improves the sintering activity of CA2, accelerates intercrystalline mixing and diffusion in the sintering process, thus the sintering of CA2 is effectively promoted. At the same time, the excess TiO2 reacts with the exsolution of Al2O3 to form the Al2TiO5 further fills the pores and promots the sintering densification of CA2. Based on the above factors, the sintering densification behavior of CA2 material is synergistically promoted. As a result, the dense microstructure is obtained, with the apparent porosity decreases from 12.7% to 4.7% and the bulk density increases from 2.51g/cm3 to 2.65g/cm3 after firing at 1600℃ for 1h by addition of 2%TiO2, and a texture microstructure of CA2 phases is prepared.

Key words: CA2, lightweight, TiO2 addition, synthesis, sintering, activation, chemical processes

摘要:

为了适应材料轻量化、经济化以及功能化的发展需要,以Al2O3和CaCO3粉末为主要原料,TiO2为添加剂,采用固相烧结法,经1200℃预烧2h-1600℃烧结1h后,制备了CA2材料,并考察了TiO2促进该材料烧结规律及其机理。结果表明,添加TiO2中的Ti4+离子在烧结过程中通过取代Al3+离子固溶入了CA2相中,有效地促进了CA2相的晶格畸变,增加了Al3+离子空位,提高了CA2相的活性,加速了离子混淆与扩散,从而有效地促进了CA2相的烧结,同时超过固溶极限过量的TiO2与脱溶的Al2O3反应生成Al2TiO5新相,填塞气孔,进一步促进了烧结致密化。综上因素,CA2材料的致密化被有效促进。当TiO2的添加量为1%时,显气孔率已由未添加时的12.7%下降到4.7%,体积密度已由未添加时的2.51g/cm3上升到2.65g/cm3,可制得显微结构交织分布的致密CA2材料。

关键词: 二铝酸钙, 轻量化, TiO2添加, 合成, 烧结, 活化, 化学过程

CLC Number: 

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