硅粉加入量对碳纤维增强铝碳耐火材料显微结构和强度的影响
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摘要
以电熔白刚玉、石墨、硅粉和碳纤维为主要原料,通过固定刚玉细粉和硅粉总含量(29%),改变硅粉加入量(0~20%)制得了六组碳纤维增强铝碳耐火材料。采用XRD、SEM及EDS等研究了硅粉加入量对不同温度处理后材料物相组成、显微结构及强度的影响。结果表明:(1)220℃热处理后,硅粉含量低于8%时,抗折耐压强度变化不大;硅粉的含量高于8%时,抗折与耐压强度均降低。(2)1400℃热处理后,当硅粉含量从0增加到8%时,耐压强度与抗折强度均得到明显改善。而当硅粉量进一步增加时,试样出现裂纹,强度显著下降。(3)综合考虑,硅粉的最佳加入量为8%,此时经220℃、1400℃热处理后材料具有最好的抗折强度及耐压强度。
Carbon fiber reinforced alumina-carbon refractories containing different silicon powder content( 0-20%) were prepared by using fused white corundum as aggregate,and graphite,carbon fiber,corundum powder as matrix,and silicon powder as additive,fixed total mass percentage( 29%) of white corundum powder and silicon powder. The phase compositions,microstructures and strengths of samples heated at different temperature were analyzed by the XRD,SEM and EDS. The results demonstrate that:( 1) When the heating temperature is 220 ℃,with an increase of silicon powder content from 0 to 8%,the compressive and flexural strengths change little; whereas,with an increase of silicon powder content from 8% to 20%, the compression and flexural strengths are reduced.( 2) When the heating temperature is 1400 ℃,with an increase of silicon powder content from 0 to 8%,the compressive and flexural strengths are significantly improved; with a further increase of silicon powder content,some cracks appeare on the surface of the samples,and then the strength decrease sharply.( 3) The most appropriate mode is a sample containing 8% silicon powder,which has optimal performance after heated at 220 ℃ and 1400 ℃.
Carbon fiber reinforced alumina-carbon refractories containing different silicon powder content( 0-20%) were prepared by using fused white corundum as aggregate,and graphite,carbon fiber,corundum powder as matrix,and silicon powder as additive,fixed total mass percentage( 29%) of white corundum powder and silicon powder. The phase compositions,microstructures and strengths of samples heated at different temperature were analyzed by the XRD,SEM and EDS. The results demonstrate that:( 1) When the heating temperature is 220 ℃,with an increase of silicon powder content from 0 to 8%,the compressive and flexural strengths change little; whereas,with an increase of silicon powder content from 8% to 20%, the compression and flexural strengths are reduced.( 2) When the heating temperature is 1400 ℃,with an increase of silicon powder content from 0 to 8%,the compressive and flexural strengths are significantly improved; with a further increase of silicon powder content,some cracks appeare on the surface of the samples,and then the strength decrease sharply.( 3) The most appropriate mode is a sample containing 8% silicon powder,which has optimal performance after heated at 220 ℃ and 1400 ℃.
引文
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[2]Fan H B,Li Y W.Microstructures and mechanical properties of Al2O3-C refractories with silicon additive using different carbon sources[J].Materials Science and Engineering A,2010,528:3177-3185.
[3]刘国齐,王金相,杨彬,等.Si粉和Al粉对N2保护热处理铝碳耐火材料性能和显微结构的影响[J].耐火材料,2005,39(4):241-245.
[4]方磊,李亚伟,金胜利,等.硅粉粒度和含量对烧成Al2O3-Zr O2-C材料强度与结构的影响[J].耐火材料,2007,41(3):183-187.
[5]Randall M.German,Sintering Theory and Practice[M].John&Sons,1996:181-183.
[6]郭巍,安胜利.二茂铁的加入对铝碳耐火材料性能的影响[J].硅酸盐通报,2007,26(5):1011.
[7]郭巍,安胜利.纳米碳催化剂对铝碳耐火材料抗氧化性能的影响[C].第六届材料科学与图像科技学术会议,包头,2007.第六届材料科学与图像科技学术会议论文集,北京:中国体视学与图像分析,2007:232-236.
[8]Matsuo Y,Tanaka M,Yoshitomi J,et al.Effect of the Carbon Nanofiber Addition on the Mechanical Properties of Mg O-C Brick[C].Congress ProceedingsofUNITECR’11,Kyoto,Japan,2011.
[9]罗三峰.稀土氧化物与碳纤维对铝碳耐火材料性能的影响[D].武汉:武汉科技大学,2007.
[10]贺福,王茂章主编.碳纤维及其复合材料[M].北京:科学出版社,1995,9.
[11]张红,李楠,鄢文.碳纤维添加量对铝碳耐火材料强度、抗氧化性及显微结构的影响[J].耐火材料,2014,48(2):106-110.
[12]贾素秋,谷卫俊,贾淑艳,等.用稻草和硅粉合成碳化硅晶须[J].稀有金属材料工程,2014,43(1):76-79.
[13]梁峰.纳米炭材料对Al2O3-C耐火材料结构和性能的影响[D].武汉:武汉科技大学,2013.