为提高粉煤灰基莫来石的力学性能,以透辉石为烧结助剂,低温条件下采用无压烧结法制得了致密高强的莫来石.通过对莫来石线收缩率、体积密度、抗折强度、孔结构的测试,并借助X射线衍射、显微镜观察、扫描电镜微观分析等方法,研究了不同烧结温度时透辉石掺量对莫来石性能和结构的影响.结果表明:烧结温度为1400℃、透辉石掺量为8％时制得的莫来石性能最佳.此时,莫来石试样的线收缩率、体积密度和抗折强度最大,分别为13.3％ 、2.88 g/cm3和160.6 MPa;试样的显气孔率仅为2.5％,莫来石试样致密程度高.透辉石在高温(≥1250℃)下熔融成液相,不但可填补莫来石烧结形成的孔洞,提高了试样结构的致密性,且有利于莫来石液相烧结,促进莫来石晶相的形成,莫来石晶相由细针状发育成短柱状,晶粒交叉生长,形成致密高强的粉煤灰基莫来石.
参考文献
| [1] | H S TRIPATHI;A GHOSH;M K HALDER .Microstructure and properties of sintered mullite developed from Indian bauxite[J].Bulletin of Materials Science,2012(4):639-643. |
| [2] | H. Pooladvand;S. Baghshahi;B. Mirhadi;A. R. Souri;H. Arabi .Effect of MgO and CaO on Transformation of Andalusite to Mullite[J].Journal of Materials Engineering and Performance,2012(8):1637-1644. |
| [3] | 杨强,黄剑锋,杨婷,曹丽云,吴建鹏.络合溶胶-凝胶法制备不同形貌的莫来石微晶[J].人工晶体学报,2011(03):630-634,638. |
| [4] | 叶昌,张海峰,陈思思.利用粉煤灰富集氧化铝制备莫来石工艺研究[J].中国陶瓷,2010(09):35-37,52. |
| [5] | 贾启辉 .利用粉煤灰和铝粉合成多孔莫来石的研究[D].天津大学,2010. |
| [6] | HongGee Kim;Olivier Gillia;Didier Bouvard .A phenomenological constitutive model for the sintering of alumina powder[J].Journal of the European Ceramic Society,2003(10):1675-1685. |
| [7] | Yingchao Dong;Xuyong Feng;Xuefei Feng .Preparation of low-cost mullite ceramics from natural bauxite and industrial waste fly ash[J].Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics,2008(1/2):599-606. |
| [8] | Yingchao Dong;Stuart Hampshire;Jian-er Zhou .Sintering and characterization of flyash-based mullite with MgO addition[J].Journal of the European Ceramic Society,2011(5):687-695. |
| [9] | 李世慧 .粉煤灰基多孔莫来石陶瓷的性能优化及低温烧结[D].天津大学,2011. |
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