Hydrogen embrittlement is a process by which hydride-forming metals become brittle, even fracture due to the penetration of hydrogen gas, and mechanical strength of relevant material will dramatically decrease because of hydrogen embrittlement. People have been studying how to prevent hydrogen embrittlement for over the past several decades.
Hydrogen gas has been widely used in powder making process of NdFeB magnet. The main phase and Nd-rich phase of NdFeB casting piece will generate lattice expansion after absorbed hydrogen, hence cause the integranular fracture and transgranular fracture, finally lead to the pulverization.
The hydrogen embrittlement mechanism of NdFeB magnet is same as its powder making process. The finished NdFeB product also does not work well together with hydrogen, and that is why the magnet is not recommended in the hydrogen atmosphere. The disintegration process will be highly accelerated under the elevated temperature and pressure.
The hydrogen embrittlement mechanism of NdFeB magnet is same as its powder making process. The finished NdFeB product also does not work well together with hydrogen, and that is why the magnet is not recommended in the hydrogen atmosphere. The disintegration process will be highly accelerated under the elevated temperature and pressure.
