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氧化铝微粉加入量对低碳镁碳砖性能的影响 被引量:13

Influence of alumina micropowder on properties of low carbon MgO-C brick
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摘要 以电熔镁砂、石墨、金属Al和氧化铝微粉为主要原料,热塑性酚醛树脂为结合剂,制备了w(C)<5%的低碳镁碳砖试样,研究了氧化铝微粉加入量(其质量分数分别为0、3%、5%、7%、9%)对低碳镁碳砖的常温物理性能、抗热震性和抗氧化性的影响。结果表明:(1)随着氧化铝微粉加入量的增加,低碳镁碳砖试样的体积密度、常温强度和高温强度均先升高后降低,显气孔率则先降低后升高;抗热震性和抗氧化性随微粉加入量的增加呈先改善后变差的趋势;其中,微粉加入量为5%的低碳镁碳试样综合性能最好。(2)低碳镁碳砖试样性能的改善主要是由于加入的氧化铝微粉和MgO在高温下原位反应生成连续分布的尖晶石,增强了基质的陶瓷结合;但氧化铝微粉加入量过大时,由于大量原位反应引起材料产生过大的体积膨胀,会导致基质结构疏松,从而恶化镁碳砖的性能。 Low carbon MgO-C brick with 5% C was prepared using fused magnesia,graphite,Al micropowder,and alumina micropowder as main starting materials,and thermosetting phenolic resin as binder.Influence of alumina micropowder additions(0,3%,5%,7%,and 9%)on cold physical properties,thermal shock resistance,and oxidation resistance of low carbon MgO-C brick was investigated.The results show that:(1)with alumina micropowder addition increasing,bulk density,cold and hot strength,thermal shock resistance and oxidation resistance of the low carbon MgO-C brick are first enhanced and then declined,apparent porosity first decreases and then increases.The optimum addition of micropowder is 5%;(2)the improvement of properties is attributed to formed continuous spinel by in-situ reaction of alumina micropowder and MgO at high temperature,which strengthens ceramic bonding of matrix.Excessive alumina micropowder is detrimental to the properties for the formation of in-situ spinel leads to the excessive volume expansion and loose matrix of low carbon MgO-C specimens.
出处 《耐火材料》 CAS 北大核心 2010年第2期89-91,99,共4页 Refractories
基金 河南省杰出人才创新基金资助项目(0621001400)
关键词 氧化铝微粉 低碳镁碳砖 抗热震性 抗氧化性 原位尖晶石 Alumina micropowder Low carbon magnesia carbon brick Thermal shock resistance Oxidation resistance In-situ spinel
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  • 1李再耕,王战民,叶国田.不定形耐火材料中的原位反应与相组成设计[J].耐火材料,2002,36(6):311-317. 被引量:10
  • 2Zhang S, Marriott N J, Lee W E. Thermochemistry and microstructures of MgO-C refractories containing various antioxidants[ J]. Journal of the European Ceramic Society,2001,21 (8) :1 037 -1 047.
  • 3Bavand-Vandchali M, Sarpoolaky H, Golestani-Fard F, et al. Atmosphere and carbon effects on microstructure and phase analysis of in situ spinel formation in MgO-C refractories matrix [ J ]. Ceramics International ,2009,35 ( 2 ) : 861 - 868.

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