当前位置: X-MOL 学术Trans. Indian Ceram. Soc. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Spark Plasma Sintering of Silicon Carbide with Al2O3 and CaO: Densification Behavior, Phase Evolution and Mechanical Properties
Transactions of the Indian Ceramic Society ( IF 1.2 ) Pub Date : 2018-10-02 , DOI: 10.1080/0371750x.2018.1521304
Ummen Sabu 1 , Bhaskar Majumdar 2 , Bhaskar P. Saha 3 , Dibakar Das 1
Affiliation  

ABSTRACT Liquid phase sintering (LPS) often yield an amorphous grain boundary region which deteriorates the high temperature properties of the sintered ceramics and thus ceramists prefer to obtain a crystalline grain boundary after LPS. This paper deals with LPS of silicon carbide ceramics to near theoretical density, understanding the densification behavior, evolution of gehlenite phase and subsequent evaluation of their mechanical properties. High density SiC ceramics were fabricated from sub- micrometre α-SiC powders with the aid of refractory phase forming metal oxide additives by spark plasma sintering. Sintering temperature and holding time at peak temperature were varied to study their effect on densification and mechanical properties. Density of the sintered ceramics reached ∼97% at 1800°C. Microstructural features and crack propagation mode were studied using scanning electron microscopy. XRD analysis confirmed the presence of crystalline gehlenite phase in the sintered samples. Hardness, fracture toughness and flexural strength of the sintered ceramics were determined by standard test procedures. GRAPHICAL ABSTRACT

中文翻译:

碳化硅与 Al2O3 和 CaO 的火花等离子体烧结:致密化行为、相变和机械性能

摘要 液相烧结 (LPS) 通常会产生非晶晶界区域,这会降低烧结陶瓷的高温性能,因此陶艺家更喜欢在 LPS 后获得晶界。本文将碳化硅陶瓷的 LPS 处理到接近理论密度,了解致密化行为、钙黄长石相的演变以及随后对其机械性能的评估。高密度 SiC 陶瓷是由亚微米 α-SiC 粉末在耐火相形成金属氧化物添加剂的帮助下通过放电等离子烧结制成的。改变烧结温度和峰值温度下的保持时间以研究它们对致密化和机械性能的影响。烧结陶瓷的密度在 1800°C 时达到 97%。使用扫描电子显微镜研究了微观结构特征和裂纹扩展模式。XRD 分析证实在烧结样品中存在结晶钙黄长石相。烧结陶瓷的硬度、断裂韧性和弯曲强度通过标准测试程序确定。图形概要
更新日期:2018-10-02
down
wechat
bug