摘要
通过热压注法制备了石英纤维增强的氧化硅基陶瓷型芯,随着石英纤维含量增加,陶瓷型芯气孔率和溶蚀性呈现出指数型增长;型芯的弯曲强度和抗蠕变性能都呈现出先增强后减弱的变化趋势。石英纤维与基体间的界面,在裂纹偏转和纤维拔出过程中吸收能量,使型芯表现出较高的弯曲强度;石英纤维在碱液中活性较高,因此保留了氧化硅基陶瓷型芯良好的溶蚀性。石英纤维含量为6%时,陶瓷型芯表现出了很好的综合性能,显气孔率为34.1%,常温和1550℃的弯曲强度分别为28.5 MPa和21.8 MPa,高温蠕变为0.26 mm,溶蚀率为0.62 g/min,很好地满足了高温合金浇注对型芯的要求。
Silica-based ceramic cores reinforced by silica fibers were manufactured by injection moulding.With increased contents of silica fibers,the porosity and the leaching rate showed exponential increased,and the flexural strength and creep resistance was falling after firstly climbing.The fiber/matrix interface demanded energy in microcrack deflection and fiber pull-out,and resulted in high flexural strength.Besides,attributed to the activity of silica fibers in alkali solution,the superior leachability was retained in the silica-based ceramic cores.The ceramic cores with 6%silica fibers displayed excellent properties,such as apparent porosity of 34.1%,flexural strength of 28.5 MPa at room temperature and 21.8 MPa at 1550℃,creep deformation of 0.26 mm and leaching rate of 0.53 g/min,which well meet the requires for superalloys casting.
作者
牛书鑫
许西庆
李鑫
杨小薇
王增利
石振梅
许亮
周悍坤
陈鑫
NIU Shuxin;XU Xiqing;LI Xin;YANG Xiaowei;WANG Zengli;SHI Zhenmei;XU Liang;ZHOU Hankun;CHEN Xin(Science and Technology on Advanced High Temperature Structural Materials Laboratory,Beijing Institute of Aeronautical Materials,Beijing 100095,China;School of Materials Science&Engineering,Chang'an University,Xi'an 710061,China)
出处
《中国陶瓷》
CAS
CSCD
北大核心
2020年第9期31-35,共5页
China Ceramics
基金
陕西省自然科学基金(2019JQ-694)。
关键词
陶瓷型芯
纤维
气孔率
弯曲强度
溶蚀性
Ceramic cores
Fiber
Porosity
Flexural strength
Leaching rate
