摘要
采用重力分离ＳＨＳ技术结合旋转工艺制备了陶瓷内衬复合弯管，在添加ＳｉＯ２的基础上，重点研究了ＮａＦ添加剂对复合弯管合成过程及组织性能的影响。研究发现，ＮａＦ以Ｎａ３ＡｌＦ６冰晶石结构和Ｎａ２ＳｉＯ３单斜结构存在于陶瓷枝晶晶界上，并因“成分过冷”，使陶瓷枝晶细密；在铝热燃烧过程中ＮａＦ作为稀释剂存在，降低燃烧温度和蔓延速率；在陶瓷凝固过程中，ＮａＦ通过降低熔体结晶温度和熔体动力粘度而促使陶瓷致密。
The curved ceramic lined pipes have been produced by gravitational separation SHS method in combination with rotating technology. Based on SiO 2 addition the influences of NaF additive on synthesis process, structure and properties of curved pipes have been investigated. It is obtained that NaF in the form of Na 3AlF 6 cryolite structure and Na 2SiO 3 monocline structure exist at the boundary of ceramic dendrite with tight fineness because of constituent undercooling. Acting as a diluent during thermite combustion process, NaF will reduce the combustion temperature and propagation rate; During ceramic solidification NaF promotes ceramic densification through reducing crystallization temperature and dynamic viscosity of the melts.
出处
《特种铸造及有色合金》
CAS
CSCD
北大核心
1999年第1期4-7,共4页
Special Casting & Nonferrous Alloys
基金
军械工程学院科研基金
