A MnAl
alloy magnetic absorbing material provided by the invention comprises atoms in the following percentage: 37-72% of Mn and 28-63% of Al. The absorbing material is prepared by a method comprising the following steps: melting raw materials of
metal Mn and Al with purity no less than 99.50% under protection of
argon; carrying out uniformization treatment on cast ingots at 900-1100 DEG C in vacuum or under protection of
argon; milling the cast ingots; and carrying out
tempering heat treatment at 200-600 DEG C. The MnAl
alloy magnetic absorbing material has characteristics of small density, good
microwave absorption characteristics in
microwave band of 2-18 GHz, wide
frequency band of absorption, good
oxidation resistance,
corrosion resistance and temperature stability, does not contain strategic
metal elements like Co, Ni and rare earths, simple preparation technology, abundant raw materials and low price. Among the magnetic absorbing materials, the MnAl
alloy magnetic absorbing material provided by the invention is more suitable for preparation of
microwave absorption products with wide
frequency band of absorption, high absorbing efficiency, small
material density, good
oxidation resistance,
corrosion resistance and temperature stability, and low cost.