摘要
为实现堇青石相的低温合成,采用粒度为≤0.044 mm的煅烧高岭土、粒度为≤0.074 mm的烧结镁砂和d_(50)=2.6μm的二氧化硅微粉为主要原料,以分析纯的氧化锆和氧化镧为烧结助剂,以聚乙烯醇PVA溶液为结合剂,按照堇青石理论配比,在60 MPa压力下成型为φ30 mm×30 mm的试样,干燥、煅烧后制备了堇青石多孔陶瓷。研究了烧结助剂氧化锆添加量(外加质量分数为0、8%)、氧化镧添加量(外加质量分数分别为0、0.2%、0.4%、0.6%、0.8%)和煅烧温度(分别为1200、1250及1300℃)对堇青石多孔陶瓷常温物理性能、物相组成和显微结构的影响。结果表明:1)在1300℃下,当试样中引入8%(w)氧化锆和0.6%(w)氧化镧时,试样的物理性能较优;2)氧化锆和氧化镧共掺杂可在显气孔率变化较小的情况下,提高试样的力学性能,且促进堇青石相的生成;3)氧化锆和氧化镧共掺杂可一定程度上降低堇青石相的合成温度,提高试样的综合性能。
To achieve the low temperature synthesis of cordierite,according to its theoretical ratio,porous cordierite ceramics were prepared using calcined kaolin(≤0.044 mm),sintered magnesia(≤0.074 mm)and silica micropowder(d_(50)=2.6μm)as main raw materials,analytically pure zirconia and lanthana as sintering aids,and polyvinyl alcohol(PVA)solution as the binder,pressing to samples ofφ30 mm×30 mm at 60 MPa,drying and calcining.The effects of the extra additions of zirconia(0 and 8%,by mass)and lanthana(0,0.2%,0.4%,0.6%and 0.8%,by mass)and calcination temperatures(1200,1250 and 1300℃)on the cold physical properties,phase composition and microstructure of the porous cordierite ceramics were studied.The results show that:(1)the sample fired at 1300℃and introduced with 8%zirconia and 0.6%lanthana shows good physical properties;(2)the co-doping of zirconia and lanthana can improve the mechanical properties of the sample while maintaining the apparent porosity,and promote the formation of cordierite;(3)the co-doping of zirconia and lanthana can reduce the synthesis temperature of cordierite and improve the comprehensive performance of the sample.
作者
张会
柴倩
张红
王艺兴
郝晨曦
王星雨
Zhang Hui;Chai Qian;Zhang Hong;Wang Yixing;Hao Chenxi;Wang Xingyu(Huaqing College,Xi’an University of Architecture and Technology,Xi’an 710043,Shaanxi,China)
出处
《耐火材料》
CAS
北大核心
2024年第2期99-103,共5页
Refractories
基金
陕西省教育厅专项科研计划项目(23JK0523)
陕西省大学生创新创业训练计划项目创新训练项目(S202313679005)。
