摘要
本文介绍一种氧化物陶瓷超快速烧结的新方法.用放电等离子烧结的方法对Al2O3、Y-TZP、YAG、Al2O3-ZrO2和莫来石等各种氧化物粉体进行了超快速烧结,采用2~3min升温到1200℃以上,不保温或保温2min,然后迅即在3min之内冷却至600℃以下的烧结温度,得到了直径为20mm的晶粒细、致密度高、力学性能好的烧结样品.对用化学共沉淀法自制的20mol%Al2O3-ZrO2(3Y)纳米粉体分别在1170~1500℃之间的7个不同温度下进行放电等离子烧结,升温速率为200℃/min,保温2min后;迅即在3min之内强制冷却至600℃以下.1350℃以上烧结得到的样品密度已接近理论密度,1250℃以上烧结得到的样品的断裂韧性K1c都大于6MPam1/2放电等离子超快速反应烧结所得到的ZrO2-莫来石复相陶瓷致密度高、力学性能好,ZrO2晶粒在莫来石基体中分布均匀,XRD结果表明,在1530℃烧结的样品中,已找不到ZrsiO4痕迹,说明在如此快速的烧结条件下;反应烧结已经可以完成.
The SPS (Spark Plasma Sintering) Process is a new materials synthesis procussing techllology recently developed by Sumitomo Coal Mining Co.Ltd.. Japan. Some oxides such as Al2O3, Y-TZP,YAG, Al2O3-ZrO2 and Mullite were successfully superfast densified by SPS under the conditions of heating rate as high as 600℃/min, no keeping time at the sintering temperatures above 1200℃,and thed fast cooling to 600℃ within 3 minutes. The superfast sintering samples show high densities, fine inicrostructures and excellent mechanical properties. The fracture toughness K1c of 20mol% Al2O3-ZrO2 (3Y) samples sinterse by SPS at> 1250℃ for 2 min is higher than 6MPa.m1/2.The reaction sintering of ZrO2- mullitc could be completed by SPS at 1530℃ for 3 min.
出处
《无机材料学报》
SCIE
EI
CAS
CSCD
北大核心
1998年第1期18-22,共5页
Journal of Inorganic Materials
关键词
氧化物陶瓷
放电
等离子
烧结
superfast densification, spark plasma sintering, oxide ceramics