▎ 摘　　要

NOVELTY - Method for preparing uniform temperature graphite tube, involves (a) performing dynamic oxidation treatment on the surface of the graphite tube, immersing the graphite tube in a dynamically flowing strong acid oxidation solution and oxidizing for 10-30 minutes, where the strong acid oxidizing solution is a sulfuric acid solution of compound (A) and compound (B), (b) cleaning with deionized water, spraying the inner wall with graphene oxide solution to form a film with a thickness of less than 100 nm, (c) drying, sintering at 300 degrees C for 1 hour and placing in a high-temperature furnace at 1600 degrees C and raising the temperature to 2000 degrees C, (d) centrifugally spraying the inner wall with graphene microsphere infrared radiation coating, drying and graphitizing. USE - The method is useful for preparing uniform temperature graphite tube in a graphite furnace. ADVANTAGE - The graphite tube has effect of preventing escape, ensures uniform temperature in furnace, and solves the problem that the high-temperature protective coating is easy to volatilize and cause pollution. DETAILED DESCRIPTION - Method for preparing uniform temperature graphite tube, involves (a) performing dynamic oxidation treatment on the surface of the graphite tube, immersing the graphite tube in a dynamically flowing strong acid oxidation solution and oxidizing for 10-30 minutes, where the strong acid oxidizing solution is a sulfuric acid solution of compound (A) and compound (B), where the compound (B) is an oxide, the compound (A) is a high oxide or peroxide of compound (B), the volume-to-mass ratio of sulfuric acid to compound (A) is 60 ml:(1-0.1) g, and the mass ratio of compound (A) and compound (B) is 1:2-1:5, (b) cleaning with deionized water, spraying the inner wall with graphene oxide solution to form a film with a thickness of less than 100 nm, where the size of the graphene oxide in the graphene oxide solution is 10-100 um, the dispersion coefficient is above 0.6, and the concentration is 10 ug/ml to 1 mg/ml, (c) drying, sintering at 300 degrees C for 1 hour and placing in a high-temperature furnace, raising the temperature to 1600 degrees C at 5 degrees C/minute, maintaining for 4 hours at 1600 degrees C, and raising the temperature to 2000 degrees C at 20 degrees C/minute, (d) centrifugally spraying the inner wall with graphene microsphere infrared radiation coating, drying and graphitizing at 3000 degrees C by raising the temperature to 500 degrees C at 5 degrees C/minute, maintaining for 2 hours, then raising the temperature to 1300 degrees C at 5 degrees C/minute, maintaining for 4 hours at 1300 degrees C, and raising the temperature to 3000 degrees C at 20 degrees C/minute and maintaining for 1 hour, where the thickness of the infrared radiation coating does not exceed 100 nm, and the coating is a mixture of wrinkled graphene microspheres and graphitizable polymer oligomers. The graphite tube comprises a graphite tube body and a temperature uniform coating on the inner wall of the graphite tube.