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注凝成型制备氧化锆增韧氧化铝陶瓷 被引量:8

Fabrication of ZrO_2 Toughened Al_2O_3 Ceramic through Gelcasting Process
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摘要 采用低毒单体N,N-二甲基丙烯酰胺(DMAA)制备了氧化锆增韧氧化铝(ZrO2/Al2O3,ZTA)陶瓷,氧化铝与氧化锆的质量比为3∶1,浆料的固相体积分数为50 vol%。讨论了不同干燥方式对干燥速率以及坯体性能的影响,研究了不同成型温度对坯体性能的影响。通过研究发现,在湿热烘箱中干燥的坯体强度最高,成型温度应控制在65℃附近。通过对不同单体含量的坯体烧结后陶瓷性能的对比,发现单体的加入量为10wt%左右较好,通过与干压成型陶瓷性能的对比,发现注凝成型得到的陶瓷强度和韧性分别提高了42.2%和23.5%,达到640 MPa和6.3MPa.m1/2,通过扫描电镜图片分析发现,注凝成型制得的陶瓷结构更均匀。 ZTA(Zirconia toughened alumina)composite ceramics were prepared using a low-toxicity monomer N,N-dimethyl acrylamide(DMAA),mass ratio of Al2O3 to ZrO2 is 3∶1,the solid loading of suspension is 50 vol%.The effect of dehydration mode on the dehydration rate and property of green body were discussed.The effect of different polymerize temperature to the strength of green bodies were investigated.The result show that the green bodies dried in moist heat oven had the highest strength and the polymerize temperature should be hold on about 65 ℃.The properties of ZTA ceramics sintered with green bodies of different DMAA content had been compared,and the best DMAA content was 10wt%.By contrasting the mechanical properties of sintered bodies made by gelcasting and dry pressing,the bending strength and fracture toughness of the ceramics made by gelcasting increased about 42.2% and 23.5% than dry pressing,reaching 640 MPa and 6.3 MPa· m1/2,respectively.SEM images show that ceramics made by gelcasting have more uniform microstructure than dry pressing.
出处 《人工晶体学报》 EI CAS CSCD 北大核心 2012年第1期152-157,164,共7页 Journal of Synthetic Crystals
基金 江苏高校优势学科建设工程资助项目
关键词 DMAA ZTA 干燥方式 成型温度 抗弯强度 断裂韧性 DMAA ZTA dehydration mode polymerize temperature bending strength fracture toughness
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