Study On The High-Temperature Regular Internation Of Cerium Iron And Arsenic

Rare earth resources are important strategically advantageous resources in China.In recent years,the research on the application of rare earth elements has received much attention;however,there are few studies on the interaction between cerium and iron and arsenic at high temperatures at home and abroad.Arsenic is enclosed in industrial pure iron cylinders according to a specific atomic ratio?Ce:As=1.0:2.5?1.0:4.0?,and is heated to the design temperature?1173K?1323K?according to the established procedure and kept warm for a certain time?0h?50h?to prepare samples.Using metallographic microscope,X-ray diffractometer,thermal field emission scanning electron microscope and other instruments for analysis,the purpose is to study the effect of cerium and arsenic atomic ratio,experimental temperature and?The results show that when the atomic ratio of cerium and arsenic is1.0:2.5?1.0:4.0,the temperature is 1173K?1323K and the temperature is kept between 0h?50h,the high-temperature products of rare earth cerium,iron and arsenic are mainly binary compound Ce As and eutectic compound Fe₂As With the ternary compound Ce₁₂Fe_57.5As₄₁.The atomic ratio of cerium and arsenic is 1.0:2.5?1.0:4.0,and the microstructure uniformity of the high-temperature interaction product of the sample is different.When the atomic ratio of cerium and arsenic is equal to 1.0:2.5,the microstructure of the sample is generally the most uniform.When the temperature is between 1173K and 1273K,the microstructure of the sample gradually becomes more uniform with the increase of temperature,but when the temperature is increased to 1323K,a large amount of iron diffuses into the sample,and the entire sample lining is close to the lining of the cylinder itself.The distribution of microstructures has also become messy.From 0h to 50h,the uniformity of the phase structure with the extension of the constant temperature time showed a trend of first increasing and then decreasing,and the most uniform at 20h of heat preservation;the most uniform distribution of microstructures with each micro contrast was that the atomic ratio of cerium and arsenic was 1.0:2.5 When the experimental temperature T is 1273K and the heat preservation t is 20h.The formation of compound Ce₁₂Fe_57.5As₄₁depends on the compound Ce As and Fe₂As.The diffusion of iron in the sample increases with increasing temperature,As mainly forms Fe₂As with Fe to achieve diffusion,while the diffusion between Ce and Fe is a non-reactive diffusion and there is no two-phase coexistence zone.