预热对制备SHS陶瓷内衬钢管的影响

详细信息

INFLUENCES OF PREHEATING TEMPERATURE ON CERAMIC-LINED PIPES BY GRAVITATIONAL-THERMIT SHS METHOD

摘要: 采用重力分离SHS法制备陶瓷内衬钢管，研究了预热温度对SHS反应过程和内衬管质量的影响。实验发现，粉末和管材预热都有助于SHS反应和提高复合管质量。粉末预热温度过低，内衬管表面不光滑且存在大量气孔，复合管力学性能低；粉末预热温度过高，添加剂CrO₃提前分解，SHS反应变慢，反应进行到最后阶段多余铁水和陶瓷不能从管内流出，使管头堵塞或内径变细，甚至造成废品。在本实验条件下，粉末烘干湿度为120℃，烘干时间4小时内衬管质量最佳。
- SHS陶瓷内衬管 /
- 预热温度
Abstract: The ceramic-lined pipes had been produced by gravitational-thermit SHS method. The influences of preheating temperature on SHS reaction and quality of ceramic surface had been investigated. It was found that preheating powder and pipes benefited the SHS reaction and the quality of ceramic lined pipes. When preheating temperatur was too low, the ceramic surface was knotty and had a lot of pores, and the machnical properties of ceramic lined pipes were poor. When the preheating temperature was too high, the SHS reaction velocity was slow for the breakdown of CrO₃ additive. Meanwhile, the unncessary melted iron and ceramic solidified in the pipes in stead of flowing out. The quality of ceramic lined pipes was the best when the powder heaed at 120℃ for 4h.
- SHS ceramic lined pipes /
- preheating temperature