SiC WHISKER-TOUGHENED ALUMINIUM NITRIDE CERAMICS
来源期刊：Journal Of Wuhan University Of Technology Materials Science Edition1993年第1期
论文作者：李凝芳
文章页码：1 - 12
摘 要：<正> Aluminium nitride ceramics containing 15—30 w/o of SiC whiskers can be sintered tofull density（by hot pressing at 1800℃）using2—3 w/o of Y2O3 additions.The whiskersincrease the toughness and strength of thecomposite,KICincreasing from 2.8 to about5.0 and flexural strength increasing by 30—50%.However,the whiskers must be welldispersed and if the dispersion is notsatisfactory,toughness may increase but thestrength decreases.The hot-pressingtemperature can be reduced by up to 100℃ ifY（NO3）3 .5H2O is used as the sinteringadditive instead of Y2O3,but some oxidation ofthe AIN occurs during heating.Isopropan-2-01 is a better dispersing agent thancyclohexane,but again some oxidation of theAIN does occur.The best sample prepared during this work contained 20 w/o of SiC whiskers and 2 w/oY2O3 added as Y（NO3）3.5H2O and mixed inisopropanol.This exhibited a mean strength of453MPa（maximum 522MPa,measured bydisc flexure）and a fracture toughness of5.5MPam1/2.
李凝芳
摘 要：<正> Aluminium nitride ceramics containing 15—30 w/o of SiC whiskers can be sintered tofull density（by hot pressing at 1800℃）using2—3 w/o of Y2O3 additions.The whiskersincrease the toughness and strength of thecomposite,KICincreasing from 2.8 to about5.0 and flexural strength increasing by 30—50%.However,the whiskers must be welldispersed and if the dispersion is notsatisfactory,toughness may increase but thestrength decreases.The hot-pressingtemperature can be reduced by up to 100℃ ifY（NO3）3 .5H2O is used as the sinteringadditive instead of Y2O3,but some oxidation ofthe AIN occurs during heating.Isopropan-2-01 is a better dispersing agent thancyclohexane,but again some oxidation of theAIN does occur.The best sample prepared during this work contained 20 w/o of SiC whiskers and 2 w/oY2O3 added as Y（NO3）3.5H2O and mixed inisopropanol.This exhibited a mean strength of453MPa（maximum 522MPa,measured bydisc flexure）and a fracture toughness of5.5MPam1/2.
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