短切硅酸铝纤维增强硅溶胶型壳的抗弯强度及高温自重变形

为了提高熔模铸造硅溶胶型壳的性能,向涂料中添加硅酸铝纤维制备纤维增强熔模铸造型壳试样。对不同纤维加入量条件下所获得的纤维增强型壳试样的常温及焙烧后抗弯强度、高温自重变形量的变化规律进行研究,并利用SEM观察型壳试样断口形貌。结果表明：随硅酸铝纤维加入量从0.2%~1.0%（质量分数,下同）变化,其常温抗弯强度显著增大,高温自重变形量减小;纤维加入量为1.0%时,试样的常温抗弯强度较未增强的试样提高了47%,而高温自重变形减少约50%。采用0.2%~1.0%的硅酸铝纤维增强后,复合型壳焙烧后强度至少提高39%。断口SEM形貌观察分析结果表明,纤维增强硅溶胶型壳试样受力破坏失效主要由于硅溶胶凝胶膜...

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Bibliographic Details
Published in材料工程 Vol. 43; no. 7; pp. 56 - 61
Main Author 吕凯 刘向东 王浩 冯华 李艳芬
Format Journal Article
LanguageChinese
Published 内蒙古工业大学材料科学与工程学院,呼和浩特,010051 2015
Subjects
抗弯强度
熔模铸造
硅酸铝纤维
纤维增强型壳
高温自重变形
高温自重变形
aluminum silicate fiber
fiber-reinforced shell
硅酸铝纤维
纤维增强型壳
抗弯强度
熔模铸造
investment casting
high-temperature self-loaded deformation
bending strength
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ISSN1001-4381
1001-4381
DOI10.11868/j.issn.1001-4381.2015.07.010

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Summary:为了提高熔模铸造硅溶胶型壳的性能,向涂料中添加硅酸铝纤维制备纤维增强熔模铸造型壳试样。对不同纤维加入量条件下所获得的纤维增强型壳试样的常温及焙烧后抗弯强度、高温自重变形量的变化规律进行研究,并利用SEM观察型壳试样断口形貌。结果表明：随硅酸铝纤维加入量从0.2%~1.0%（质量分数,下同）变化,其常温抗弯强度显著增大,高温自重变形量减小;纤维加入量为1.0%时,试样的常温抗弯强度较未增强的试样提高了47%,而高温自重变形减少约50%。采用0.2%~1.0%的硅酸铝纤维增强后,复合型壳焙烧后强度至少提高39%。断口SEM形貌观察分析结果表明,纤维增强硅溶胶型壳试样受力破坏失效主要由于硅溶胶凝胶膜的断裂、硅酸铝纤维拔出、断裂及脱粘等综合作用所致。
Bibliography:11-1800/TB
LYU Kai,LIU Xiang-dong,WANG Hao,FENG Hua,LI Yan-fen （School of Materials Science and Engineering, Inner Mongolia University of Technology, Hohhot 010051 ,China）
In order to improve the strength of silicon sol shell for investment casting process,short fibers of aluminum silicate were mixed into the slurries.The flexural strength of green shell,fired strength and self-loaded deformation at elevated temperature were investigated and the fracture surface of shell samples were observed by SEM.The results show that as content of aluminum silicate fibers increases from 0.2%to 1.0%（mass fraction,same as below）,the green strength of shell specimens is increased and the self-loaded deformation at elevated temperature is decreased.The shell specimen reinforced with 1.0% fibers addition reaches the highest green strength,an increase of 47% than the shell specimen unreinforced with fibers,and the self-loaded deformation at elevated temperature has a decrease of about 50%.The fired strength of shell sample with t
ISSN:1001-4381
1001-4381
DOI:10.11868/j.issn.1001-4381.2015.07.010