添加镁橄榄石颗粒对镁质中间包涂料性能的影响
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摘要
为了降低中间包用耐火材料的成本并节约资源,以马钢生产的市售镁质中间包涂料为基础,添加20%(w)的烧结或不烧镁橄榄石颗粒(3～1 mm)替代同粒度的烧结镁砂制成含镁橄榄石的镁质中间包涂料,并研究了该涂料经1 500℃保温3 h热处理后的常温物理性能、抗渣侵蚀性能和显微结构。结果表明:添加烧结镁橄榄石颗粒的中间包涂料的体积密度高于不添加镁橄榄石颗粒的,且显气孔率降低,常温抗折强度和耐压强度较不加镁橄榄石颗粒的略有降低;添加不烧镁橄榄石颗粒的体积密度和强度略低于不加镁橄榄石颗粒的;静态抗渣试验显示,无论是否含有镁橄榄石颗粒,三种中间包涂料均以渗透侵蚀为主,其抗渣侵蚀能力基本相当。
This work aims at reducing the cost of refractories for tundish and saving energy. A forsteritecontaining tundish coating was prepared on the basis of a commercially available magnesia tundish coating from Masteel by adding 20 mass% calcined or unburned forsterite particles( 3-1 mm) to substitute for the sintered magnesite of the same particle size. The cold physical properties,slag resistance,and microstructure of the coating hot treated at 1 500 ℃ for 3 h were studied. The results show that the tundish coating with calcined forsterite particles has higher bulk density,lower apparent porosity,slightly lower cold modulus of rupture and cold crushing strength than that without forsterite particles; the bulk density and strength of the coating with unburned forsterite particles are slightly lower than those of the coating without forsterite particles; the static slag resistance test shows that the three tundish coatings have basically the same slag corrosion resistance whether containing forsterite particles or not; the permeation corrosion is dominant.
This work aims at reducing the cost of refractories for tundish and saving energy. A forsteritecontaining tundish coating was prepared on the basis of a commercially available magnesia tundish coating from Masteel by adding 20 mass% calcined or unburned forsterite particles( 3-1 mm) to substitute for the sintered magnesite of the same particle size. The cold physical properties,slag resistance,and microstructure of the coating hot treated at 1 500 ℃ for 3 h were studied. The results show that the tundish coating with calcined forsterite particles has higher bulk density,lower apparent porosity,slightly lower cold modulus of rupture and cold crushing strength than that without forsterite particles; the bulk density and strength of the coating with unburned forsterite particles are slightly lower than those of the coating without forsterite particles; the static slag resistance test shows that the three tundish coatings have basically the same slag corrosion resistance whether containing forsterite particles or not; the permeation corrosion is dominant.
引文
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[14]丁军,邓承继,祝洪喜,等.以Na2SO4介质制备镁橄榄石轻质材料的性能研究[J].耐火材料,2013,47(5):358-361.
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[16]田晨,何志军,张军红,等.橄榄石作为熔剂用于烧结生产的理论研究[J].烧结球团,2016,41(6):5-10+47.
[2]窦刚,李友胜,李胜,等.含石灰石的镁橄榄石质中间包涂料的性能研究[J].耐火材料,2010,44(2):108-110.
[3]魏军从,张连进,姜乐,等.镁橄榄石加入量对镁质浇注料性能的影响[J].耐火材料,2014,48(4):282-284+287.
[4]陈勇,于景坤,甘明亮.镁橄榄石对中间包镁质干式料性能的影响[J].耐火材料,2012,46(1):28-30.
[5]马青花,闫芳,曾广娅,等.中间包用镁橄榄石质涂抹料的研制与使用[J].耐火材料,2010,44(4):315-316.
[6]余超,祝洪喜,邓承继,等.镁橄榄石、矾土、石英砂合成堇青石的工艺研究[J].耐火材料,2015,49(6):432-434+445.
[7]王杏,董喆,王君君,等.镁源种类对熔盐法合成镁橄榄石的影响[J].耐火材料,2017,51(2):140-142.
[8]张小军,祝洪喜,邓承继,等.熔盐法制备镁橄榄石轻质保温隔热材料的物相及性能[J].机械工程材料,2015,39(2):26-29.
[9]宋云飞,彭玮科,祝洪喜,等.Na Cl-Na2CO3熔盐介质中制备的镁橄榄石多孔材料的气孔分形特征[J].功能材料,2016,47(S1):193-197+202.
[10]ZHU H X,DUAN H J,YUAN W J,et al.Mechanism of the carbothermal synthesis of Mg Al2O4-Si C refractory composite powders by forsterite,alumina and carbon black[J].Ceram Eng Sci Proc,2014,34(8):105-110.
[11]丁军,邓承继,祝洪喜,等.镁橄榄石多孔隔热材料的制备与机理研究[J].稀有金属材料与工程,2013,42(1):901-904.
[12]丁军,邓承继,祝洪喜,等.熔盐介质法制备轻质材料的熔盐回收再利用[J].陶瓷学报,2016,37(4):123-127.
[13]丁军,邓承继,祝洪喜,等.熔盐介质中制备镁橄榄石轻质材料的机理[J].硅酸盐通报,2012,31(1):129-133.
[14]丁军,邓承继,祝洪喜,等.以Na2SO4介质制备镁橄榄石轻质材料的性能研究[J].耐火材料,2013,47(5):358-361.
[15]DUAN H J,ZHU H X,LIANG P F,et al.Synthesis of Mg Al2O4-SiC-C refractory powders by using forsterite,alumina and carbon black[J].Adv Mater Res,2012,399-401:838-841.
[16]田晨,何志军,张军红,等.橄榄石作为熔剂用于烧结生产的理论研究[J].烧结球团,2016,41(6):5-10+47.