Al_2O_3纤维对SiO_2基陶瓷型芯的烧缩阻滞  

Effect of Al_2O_3 fiber on shrinkage blocking of SiO_2 matrix ceramic core

作　　者：芦刚[1] 于航 严青松[1] 饶文杰[1] 郭振华 

机构地区：[1]南昌航空大学轻合金加工科学与技术国防重点科学实验室,南昌330063

出　　处：《复合材料学报》2018年第1期168-172,共5页Acta Materiae Compositae Sinica

基　　金：航空科学基金(2015ZE56015)

摘　　要：向SiO_2基体粉料中添加Al_2O_3纤维,采用热压注法制备Al_2O_3/SiO_2陶瓷型芯。分析Al_2O_3纤维含量对陶瓷型芯性能的影响。研究结果表明:Al_2O_3纤维含量对Al_2O_3/SiO_2陶瓷型芯的线收缩率、体积密度和抗弯强度均有较大的影响。当Al_2O_3纤维含量大于1wt%时,Al_2O_3/SiO_2陶瓷型芯的线收缩率大幅度降低,稳定在0.335%左右,体积密度随之降低,稳定在1.790g·cm-3左右;当Al_2O_3纤维含量为1wt%时,陶瓷型芯抗弯强度达最大值20.48 MPa。分析了Al_2O_3纤维对Al_2O_3/SiO_2陶瓷型芯烧结收缩的阻滞作用机制。Al2O3 fiber was added into the SiO2 matrix powder,and the Al2O3/SiO2 ceramic core was prepared by hot-pressing method.The effects of Al2O3 fiber content on the properties of Al2O3/SiO2 ceramic core were analyzed.The results indicate that the mass fraction of Al2O3 fiber has a great influence on the linear shrinkage,bulk density and flexural strength of Al2O3 fiber/SiO2 ceramic core.When the content of Al2O3 fiber is more than 1 wt%,the linear shrinkage of the Al2O3/SiO2 ceramic core decreases to 0.335%,the volume density of the core decreases,and it is stable at 1.790 g·cm-3;When the Al2O3 fiber mass fraction is 1 wt%,the flexural strength of the core reaches the maximum value of 20.48 MPa.The mechanism of Al2O3 fiber on the sintering shrinkage of Al2O3/SiO2 ceramic core was analyzed.

关 键 词：AL2O3纤维 Al2O3/SiO2 陶瓷型芯 石英玻璃 烧结收缩 

分 类 号：TQ174.75[化学工程—陶瓷工业]