摘要
采用２．４５ＧＨｚ，５ｋＷ功率源的多模腔微波烧结装置对１５％（按质量计，下同）ＺｒＯ＿２（２．５％（ｍｏｌ）Ｙ＿２Ｏ＿３）＋８５％Ａｌ＿２Ｏ＿３的ＺＴＡ陶瓷的微波加热烧结特性，显微结构和力学性能作了较系统的研究，并与常规烧结进行比较。通过合理的保温结构设计和良好的腔体负载阻抗匹配实现了微波快速烧结。实验发现：在多模腔中ＺＴＡ陶瓷坯体经微波加热约３０ｍｉｎ至１５４０℃保温２０ｍｉｎ（共约５０ｍｉｎ），其密度可达到理论密度的９９．０％，远少于常规烧结时间（１７ｈ），且烧结温度有一定降低。性能测试与扫描电镜分析结果表明：与常规的无压烧结相比，微波烧结ＺＴＡ试样内部晶粒细小，均匀度好，力学性能亦有一定改善。
Zirconia toughened alumina(ZTA)cerarnics with a composition of 15%(in mass)ZrO_2(2.5%(mol)Y_2O_3)+85%(in mass)Al_2O_3 was sintered by microwave in a multi-mode cavity of 2.45GHz and 5kW.The rnicrowave heating process,microstructure and mechanical properties of sintered specimen were also com-pared with those of the specimen sintered in routine,Rapid sintering and densification were realized by adjusting appropriate insulation plotting and critical impedance matching in the resonant cavity. A relative density up to 99.0% theoretical can be obtained under the microwave processing for 30 min up to 1540℃.Sintering time is significantly reduced and sintering temperature is lower than that in routine sintering.The property tests and SEM analysis show that the microwave sintered ZTA have higher fracture toughness,fine and more uniform grain size when compared to those in the routine sintered.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
1995年第1期7-13,共7页
Journal of The Chinese Ceramic Society
基金
国家自然科学基金
关键词
氧化锆
增韧
氧化铝陶瓷
微波烧结
烧结
陶瓷
zirconia toughened alumina ceramics,microwave sintering,multimode resonant cavity
