Study on Usage Principle of Dilute on Ceramic-lined Compound Pipes Prepared by Gravitational SHS Method
The Al2O3/Fe compound pipes were prepared by gravitational separation self-propagation high-temperature synthesis method.The effect of two kinds of dilute SiO2 and CaF2 on the quality of ceramic layer was studied in detail.The results show that the effect of SiO2 on the ceramic layer is much bigger than that of CaF2 and the excess SiO2 addition significantly increase porosity of ceramic layer at bottom of compound pipe.Appropriate content of adding SiO2 alone was less than 2%,and CaF2 content was 2%~8%.The compound addition has better effect,but SiO2 content should not more than that of CaF2,and ceramic layer density can reach up to 3.910 g·cm-3 with 4%SiO2 and 4%CaF2 addition.