▎ 摘　　要

NOVELTY - A composite magnetic material comprises 15-20 pts. wt. iron oxide, 5-10 pts. wt. boron oxide, 0.5-1.5 pts. wt. bismuth oxide, 0.2-0.8 pt. wt. alumina, 2-10 pts. wt. cobalt oxide, 2-5 pts. wt. graphene, 12-20 pts. wt. polyamide, 25-35 pts. wt. calcium carbonate 10-15 pts. wt. carbonic acid, 10-15 pts. wt. silica, 15-20 pts. wt. silica, 0.5-1.5 pts. wt. molybdenum dioxide, 8-15 pts. wt. epoxy resin, 1-5 pts. wt. dispersant, 2-12 pts. wt. binder, 0.5-0.8 pt. wt. copper, and 0.5-0.8 pt. wt. magnesium. USE - Composite magnetic material. ADVANTAGE - The material has high magnetic conductivity, high temperature stability, corrosion resistance, good elasticity and stretchability, and high mechanical strength. DETAILED DESCRIPTION - Composite magnetic material comprises 15-20 pts. wt. iron oxide, 5-10 pts. wt. boron oxide, 0.5-1.5 parts bismuth oxide, 0.2-0.8 pt. wt. alumina, 2-10 pts. wt. cobalt oxide, 2-5 pts. wt. graphene, 12-20 pts. wt. polyamide, 25-35 pts. wt. calcium carbonate 10-15 pts. wt. carbonic acid, 10-15 pts. wt. silica, 15-20 pts. wt. silica, 0.5-1.5 pts. wt. molybdenum dioxide, 8-15 pts. wt. epoxy resin, 1-5 pts. wt. dispersant, 2-12 pts. wt. binder, 0.5-0.8 pt. wt. copper, and 0.5-0.8 pt. wt. magnesium. The magnetic material is prepared by grinding above raw materials into average particle diameter of 10-20 mu m, putting in mixer, mixing for 30-60 seconds, frying until temperature reaches 170-200 degrees C, adding 5-9 wt.% phosphoric acid dilute solution for surface treatment, roasting, adding 3-6 wt.% epoxy resin, continuously roasting to dry; and drying and pressing, magnetic core annealing, introducing mixed gas of hydrogen and nitrogen into heat treatment furnace, and treating at 550 degrees C for 2 hours.