添加硼化钙对镁钙碳耐火材料抗氧化性能的影响
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摘要
以CaB6作为抗氧化添加剂,采用TGA、XRD、显气孔率测定等方法,研究了CaB_6对MgO-CaO-C耐火材料抗氧化性能和其他性能的影响规律,研究结果表明:添加CaB_6能显著提高MgO-CaO-C耐火材料的抗氧化性能和结构致密性;CaB_6与O_2开始反应温度约为700℃;并确定CaB_6的合理添加量为4%左右;1500℃烧后试样的氧化区域和未氧化区域之间有一个致密氧化层存在,阻止了耐火材料中碳的氧化,其成分主要是含钙硼酸盐。
Calcium hexaboride (CaB_6) was added to MgO-CaO-C refractories as anti-oxidant and its behaviors on improving the oxidation resistance and other properties was investigated with thermal gravimetric (TG) furnace, X-ray diffraction (XRD) and apparent porosity as well as other properties. The results showed that the oxidation resistance of MgO-CaO-C refractories was effectively improved by addition of CaB_6 and the compactness of the refractories was improved. The added CaB_6 began to react with oxygen at ~ 700℃. The suitable adding amount of CaB_6 was about 4%. In addition, after heating at 1500 °C, an obvious oxide layer consisted of vitreous calcium bearing borates were formed between the unoxidized zone and the oxidized zone.
Calcium hexaboride (CaB_6) was added to MgO-CaO-C refractories as anti-oxidant and its behaviors on improving the oxidation resistance and other properties was investigated with thermal gravimetric (TG) furnace, X-ray diffraction (XRD) and apparent porosity as well as other properties. The results showed that the oxidation resistance of MgO-CaO-C refractories was effectively improved by addition of CaB_6 and the compactness of the refractories was improved. The added CaB_6 began to react with oxygen at ~ 700℃. The suitable adding amount of CaB_6 was about 4%. In addition, after heating at 1500 °C, an obvious oxide layer consisted of vitreous calcium bearing borates were formed between the unoxidized zone and the oxidized zone.
引文
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[12] S Q ZHENG,G H MIN,Z D ZOU,et al.High Temperature Oxidation of Calcium Hexaboride Powders [J].Materials Letters,2004,58:2586-2589．
[2] DEGAWA T.Some Properties and Application of Calcia Ceramics [J].Seramikkusu,1988,23 (11) :1052-1055．
[3] WEI Y,LI N,KUANG J C,et al.Desulfurization and Dephosphorization of Molten Iron in Basic Refractories [J].Inter Ceram,2002,51 (3) :200-205．
[4] EWAIS,MEMADMONHAMED.Carbon Based Refractories [J].Ceram.Soc.Jpn.,2004,112 (10) :517-532．
[5] YAMAGUCHI A.Carbon Containing Complex Refractories [J].Kizoku,1994,64 (11) :52-152．
[6] YAMAGUCHI A.Behaviors of SiC and Al Added to Carbon Containing Refractories [J].Taikabutsu Overseas,1984,4 (3) :14-18．
[7] YAMAGUCHI A.Thermalchemical Analysis for Reaction Process of Aluminium and Aluminium-compounds in Carbon-containing Refractories [J].Taikabutsu Oversea,1987,7 (2) :11-16．
[8] MATSUSHITA J,KIYOTAKA.Oxidation of Calcium Boride at High Temperature [J].Journal of Materials Synthesis and Processing,1998,6 (6) :407-410．
[9] HANAGIRI S,HARADA T,ASO S,et al.Effects of the Addition of Metal and CaB6 to Magnesia Carbon Bricks for Converter [J].Taikabutu,1992,44:490-498．
[10] 叶方保,RIGAUD M.含硼添加剂对白云石碳耐火材料抗氧化与抗侵蚀性的影响[J].耐火材料,1999,33(2) :61-66．
[11] 叶方保,钟焰,RIGAUD M.含碳耐火材料用硼化物添加剂[J].耐火材料,1997,31(5) :297-301．
[12] S Q ZHENG,G H MIN,Z D ZOU,et al.High Temperature Oxidation of Calcium Hexaboride Powders [J].Materials Letters,2004,58:2586-2589．