Preparation of Calcium Hexaluminate using Al2O3 and White Beach Sand from Western Australia
Calcium hexaluminate (CA6) is valued as a new high-temperature insulation materials because of its high stability,high melting point and low thermal conductivity properties.In this paper,chemical analysis and XRD were used to investigate the composition of the white beach sand mineral from Perth coast of Western Australia,which was consisted of carbonate.White beach sand as calcium source and industrial alumina as aluminum source respectively were used to synthesize CA6 at 1550 ℃-1650 ℃ for 3 h.Effects of different amounts of alumina and sintering temperature on synthesis of calcium hexaluminate were studied.The results showed that synthetic CA6 was shaped in platelet crystalline.The main phase of the samples with decreasing or increasing 5%,10% and 15% alumina around theoretical ratio were CA6.The porosity of the samples obtained was about 53%.The bending strength of sample of theoretical ratio was up to 7.73 MPa.Sintering temperature from 1500 ℃ to 1650 ℃ was not conductive to the improvement of apparent porosity of CA6 materials.
CA6 white beach sand industrial alumina Sintering temperature
Chunyan Zeng Zhaohui Huang Juntong Huang Yan Li Youguo Xu Shuai Yi Minghao Fang Yan-gai Liu
School of Materials Science and Technology,China University of Geosciences(Beijing),Beijing 100083,P.R.China
国际会议
The Seventh China International Conference on High-Performance Ceramics (第七届先进陶瓷国际研讨会(CICC-7))
厦门
英文
940-944
2011-11-04（万方平台首次上网日期，不代表论文的发表时间）