耐火与石灰 ›› 2020, Vol. 45 ›› Issue (6): 1-4.

• 综述 •    下一篇

烧成温度对刚玉-尖晶石浇注料性能与显微结构的影响

谢国锋  崔庆阳  侯耀仲  郭东方   

  1. 洛阳利尔耐火材料有限公司, 洛阳471000
  • 出版日期:2020-12-10 发布日期:2021-03-12

Effect of firing temperature on properties and microstructure of corundum-spinel castable

Xie Guofeng  Cui Qingyang  Hou Yaozhong  Guo Dongfang   

  1. LuoYang LIER Refractories Co.,Ltd., Luoyang 471000, China
  • Online:2020-12-10 Published:2021-03-12

摘要:

以板状刚玉、白刚玉、烧结镁铝尖晶石、活性α-Al2O3微粉和铝酸钙水泥为主要原料,制备了刚玉-尖晶石浇注料,研究了不同烧成温度对刚玉-尖晶石浇注料物理性能与显微结构的影响。结果表明:经1 400 ℃烧成后,开始形成部分CA6晶体,随着烧成温度的升高,CA6晶体大量生成并发育长大,穿插在气孔中形成连续网络结构,试样结构逐渐变得致密,基质结合得以加强,试样的断裂方式逐渐由沿晶断裂转变为穿晶断裂,其常温强度与高温强度不断提高,热震稳定性得到改善。1 550 ℃烧后的试样其高温强度最高,热震稳定性最佳。1 400~1 450 ℃以CA6晶体的生成为主,试样烧后表现为膨胀;1 500~1 550 ℃以烧结作用为主,试样烧后表现为收缩,1 550 ℃烧后收缩率较大,达到0.25%。

关键词: 刚玉-尖晶石浇注料, 烧成温度, CA6晶体, 物理性能

Abstract:

The corundum-spinel castable was prepared by using tabular alumina, white fused alumina,sintered magnesia-alumina spinel,active α-Al2O3 micropowder and calcium aluminate cement as main raw materials.The effects of different firing temperature on the physical properties and microstructure of corundum-spinel castable were studied.The results show that part of CA6 crystals begin to form after firing at 1 400  ℃.With the increase of firing temperature,a large number of CA6 crystals form and grow up,interspersing in the pores to form a continuous network structure.The continuous network structure makes the sample become dense and strengthens the combination of the matrix,and makes the fracture mode of the sample gradually change from intergranular fracture to transgranular fracture,so that CMOR ,HMOR and the thermal shock stability of the sample become continuously improved.After firing at 1 550  ℃,the HMOR of the sample is the highest and the thermal shock stability is the best.After firing at 1 400  ℃ to 1 450  ℃,the formation of CA6 crystal is dominant,and the sample shows expansion after firing; after firing at 1 500  ℃ to 1 550  ℃,the sintering is dominant,and the sample shows shrinkage after firing.After firing at 1 550  ℃,the shrinkage of the sample reached 0.25%.

Key words: Corundum-spinel castable, Firing temperature, CA6 crystal, Physical properties

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