基于灰色系统理论的高铝砖孔结构与强度的相关性
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摘要
采用灰色关联理论对烧成高铝砖内部孔结构与其抗折和抗压强度的相关性进行了研究。采用扫描电子显微镜、压汞仪和万能强度试验机等对高铝砖显微结构、孔结构参数和强度进行表征,结果表明:高铝砖的体积密度沿砖的压制方向上密下疏,材料显气孔率由上到下逐渐增大。显气孔率增大时,先是小孔径(<10μm)量增加,然后小孔增量消失,稍大孔径(10~15μm)量增加。小孔比例增加有利于材料抗折强度增大,其中1~10μm的孔所占比例对抗折强度影响更大。大孔径比例增加,材料的常温强度下降;材料的抗折强度与材料内部的小孔比例以及孔的复杂程度关联系数较大,而材料的抗压强度与材料内部大孔所占比例的关联系数更大。
Influence of pore structure of alumina brick on its modulus of rupture(MOD) and cold crushing strength(CCS) at room temperature was investigated based on the grey system theory. The pore structure of specimens was characterized by scanning electron microscopy, mercury intrusion porosimetry(MIP) and universal strength test, respectively. The results show that the alumina brick appears inhomogeneous, and the bulk density decreases and the apparent porosity increases along the pressing direction. The content of micro pores with the sizes of <10 μm first increases, and then the content of greater pores with the sizes of 10~(–15) μm increases. The micro pores disappear when the apparent porosity increases. The existence of micro pores favors the MOR, especially for the pores with the sizes of 1–10 μm. Also, the increase of greater pores content affects the MOD and the CCS negatively. The correlation coefficients between the MOR and the content of micro pores and between the CCS and the content of greater pores are greater than other pore structure parameters.
Influence of pore structure of alumina brick on its modulus of rupture(MOD) and cold crushing strength(CCS) at room temperature was investigated based on the grey system theory. The pore structure of specimens was characterized by scanning electron microscopy, mercury intrusion porosimetry(MIP) and universal strength test, respectively. The results show that the alumina brick appears inhomogeneous, and the bulk density decreases and the apparent porosity increases along the pressing direction. The content of micro pores with the sizes of <10 μm first increases, and then the content of greater pores with the sizes of 10~(–15) μm increases. The micro pores disappear when the apparent porosity increases. The existence of micro pores favors the MOR, especially for the pores with the sizes of 1–10 μm. Also, the increase of greater pores content affects the MOD and the CCS negatively. The correlation coefficients between the MOR and the content of micro pores and between the CCS and the content of greater pores are greater than other pore structure parameters.
引文
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[3]张明,卢裕杰,杨强.准脆性材料的破坏概率与强度尺寸效应[J].岩石力学与工程学报,2010,29(9):1782–1789.ZHANG Ming,LU Yujie,YANG Qiang.Chin J Rock Mech Eng(in Chinese),2010,29(9):1782–1789.
[4]杨康,王志刚,刘昌明.基于细观损伤力学的耐火材料单轴压缩非线性力学行为研究[J].工程力学,2014,31(7):199–202.YANG Kang,WANG Zhigang,LIU Changming.Eng Mech(in Chinese),2014,31(7):199–202.
[5]李楠,顾华志,赵惠忠.耐火材料学[M].北京,冶金工业出版社,2010:88–90.
[6]邓聚龙.灰色系统理论教程[M].武汉:华中理工大学出版社,1990:428.
[7]赵晶,代贺渊,张长福.基于灰关联的混凝土耐久性分析[J].低温建筑技术,2013,35(8):145–148.ZHAO Jing,DAI Heyuan,ZHANG Changfu.Low Temp Constr Technol(in Chinese),2013,35(8):145–148.
[8]冯庆革,卢凌寰,杨绿峰.混凝土孔径分布与强度关系的灰色系统研究[J].广西大学学报(自然科学版),2007,32(3):255–258.FENG Qingge,LU Linghuan,YANG Lvfeng.J Guangxi Univ:Nat Sci Ed)(in Chinese),2007,32(3):255–258.
[9]方斌祥,朱伯铨,李享成,等.刚玉质浇注料孔径分布及其与强度的定量关系[J].耐火材料,2009,43(6):412–416.FANG Binxiang,ZHU Boquan,LI Xiangcheng,et al.Refractories(in Chinese),2009,43(6):412–416.
[10]朱伯铨,方斌祥,李享成,等.气孔结构参数对耐火浇注料性能影响的研究进展[J].耐火材料,2010,44(1):63–66.ZHU Boquan,FANG Binxiang,LI Xiangcheng,et al.Refractories(in Chinese),2010,44(1):63–66.
[11]宋云飞,邓承继,祝洪喜,等.基于灰色系统理论的多孔镁橄榄石材料气孔特性与耐压强度的相关性[J].硅酸盐学报,2016,44(6):896–900.SONG Yunfei,DENG Chengji,ZHU Hongxi,et al.J Chin Ceram Soc,2016,44(6):896–900.
[12]李永鑫,陈益民,贺行洋,等.粉煤灰–水泥浆体的孔体积分形维数及其与孔结构和强度的关系[J].硅酸盐学报,2003,31(8):774–779.LI Yongxin,CHEN Yimin,HE Xingyang,et al.J Chin Ceram Soc,2003,31(8):774–779.
[13]喻乐华,欧辉,段庆普.掺珍珠岩水泥石孔分形维数及其与孔结构、强度的关系[J].材料科学与工程学报,2007,25(2):201–204.YU Lehua,OU Hui,DUAN Qingpu.J Mater Sci Eng(in Chinese),2007,25(2):201–204.
[14]郭伟,秦鸿根,陈惠苏,等.分形理论及其在混凝土材料研究中的应用[J].硅酸盐学报,2010,38(7):1362–1368.GUO Wei,QIN Honggen,CHEN Huisu,et al.J Chin Ceram Soc,2010,38(7):1362–1368.
[15]刘立营,王秀峰,章春香,等.分形理论及其在无机材料研究中的应用[J].陶瓷,2008(6):22–25.LIU Liying,WANG Xiufeng,ZHANG Chunxiang,et al.Ceramic(in Chinese),2008(6):22–25.
[16]全国耐火材料标准化技术委员会.耐火材料标准汇编.上册[M].4版,北京:中国标准出版社,2010.
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[18]张成库,李慧雯,邵红.高铝砖产生裂纹的原因简析及改善措施[J].山东冶金,2015(1):15–17.ZHANG Chengku,LI Huiwen,SHAO Hong.Shangdong Met(in Chinese),2015(1):15–17.
[19]张玉涛,王德明,仲晓星.煤孔隙分形特征及其随温度的变化规律[J].煤炭科学技术,2007,35(11):73–76.ZHANG Yutao,WANG Deming,ZHONG Xiaoxing.Coal Sci Technol(in Chinese),2007,35(11):73–76.
[20]王少华,邓承继,张小军,等.镁橄榄石隔热材料孔体积分形维数特征[J].硅酸盐学报,2015,43(3):351–357.WANG Shaohua,DENG Chengji,ZHANG Xiaojun,et al.J Chin Ceram Soc,2015,43(3):351–357.