Influences of Metal Fluoride on Curved Ceramic Lined Pipes by Gravitational Separation SHS Method

Du Xinkang  Zhao Zhongmin  Ye Minghui  Wang Jianjiang

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Influences of Metal Fluoride on Curved Ceramic Lined Pipes by Gravitational Separation SHS Method
Issue 1, (1999)
Published： 1999 ，
DOI：

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[1]杜心康,赵忠民,叶明惠,王建江.金属氟化物对SHS陶瓷内衬复合弯管的影响[J].特种铸造及有色合金,1999(01):5-8.

Du Xinkang Zhao Zhongmin Ye Minghui Wang Jianjiang. Influences of Metal Fluoride on Curved Ceramic Lined Pipes by Gravitational Separation SHS Method. [J]. Special Casting & Nonferrous Alloys (1).(1999)
[1]杜心康,赵忠民,叶明惠,王建江.金属氟化物对SHS陶瓷内衬复合弯管的影响[J].特种铸造及有色合金,1999(01):5-8. DOI：

Du Xinkang Zhao Zhongmin Ye Minghui Wang Jianjiang. Influences of Metal Fluoride on Curved Ceramic Lined Pipes by Gravitational Separation SHS Method. [J]. Special Casting & Nonferrous Alloys (1).(1999) DOI：

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。

Abstract

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.

关键词

SHS方法陶瓷内衬复合弯管金属氟化物

Keywords

SHS MethodCurved Ceramic Lined PipesMetal Fluoried

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