摘要
sialon陶瓷因其具有优异的高温机械性能而受到了广泛的关注。它主要有α和β两种晶体结构,一般认为,β-sialon为长棒状,具有较高的断裂韧性,而α-sialon为等轴状,具有较高的硬度,但断裂韧性较低。近些年来,很多学者展开了α-sialon陶瓷增韧技术的研究,一方面是通过材料组分设计、选用不同的烧结助剂及调整烧结工艺等,制备出具有长棒状晶粒形貌的高强、高断裂韧性的α-sialon陶瓷,另一方面是通过掺杂第二相制成复合陶瓷来增加其韧性,使其能作为切削工具用于铸铁、镍基等高温合金的有效加工,拓宽了α-sialon陶瓷的应用领域。本文对长棒状α-sialon陶瓷的制备、复合α-sialon陶瓷的制备及其高温抗氧化性能性能及性能影响因素进行了综述。
Sialon ceramics have attracted intensive attention due to their excellent mechanical properties.There are two main phases which areα-sialon andβ-sialon.It’s generally accepted thatβ-sialon grains have elongated shapes with high fracture toughness,whereasα-sialon can only form equiaxed grains with high hardness but low fracture toughness.In recent years,technologies to toughenα-sialon ceramics have been studied.One way is to obtain elongatedα-sialon grains by designing material compositions,using different sintering additives,adjusting sintering process etc.Another way is to fabricate composite ceramics by doping the second phase.Thus,α-sialon ceramics with high hardness and fracture toughness can be used as cutting tools for effective machining of cast iron and nickle-based super alloys,which broadens their application fields.The methods to fabricate elongatedα-sialon ceramic andα-sialon composite ceramic,high thermal oxidation resistance properties and their influence factors were reviewed in this article.
作者
范德蔚
薛彦
邱联昌
王旭
Fan De-wei;Xue Yan;Qiu Lian-chang;Wang Xue(Ganzhou Achteck Tool Technology Co.,Ltd,Ganzhou 341000,China)
出处
《佛山陶瓷》
2022年第5期17-22,共6页
Foshan Ceramics
