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研究了氢爆碎 (hydrogen decrepitation,HD)过程中不同合金及合金表面状态的吸氢速率和吸氢量 ,并采用 X射线衍射、扫描电镜等手段研究 HD粉加热去氢过程中放氢规律和粉体微观形貌的变化。结果表明氢爆碎的吸氢速度和吸氢量与钕铁硼合金铸锭表面的活性有关 ,表面新鲜、活性大的合金铸锭氢爆碎的时间短、效率高。合金中存在足够的富 Nd相 ,是室温氢爆碎过程得以进行的前提条件。将 HD粉加热处理时 ,随加热温度的升高 ,氢不断释放出来 ,到10 73K时磁粉中氢的质量分数已降低到 1.5× 10 - 5,氢气基本释放。生产中可以将 HD粉经 5 2 3～ 72 3K加热放氢 1h后再进行磁场成型 ,以减少氢气对 HD粉体成型取向度的影响
The hydrogen absorption rates and hydrogen absorption capacities of different alloys and alloy surfaces during hydrogen decrepitation (HD) process were studied. The hydrogen desorption and dehydrogenation processes were studied by X-ray diffraction and scanning electron microscopy. Powder morphology changes. The results show that the hydrogen decrepitation hydrogen absorption rate and the amount of hydrogen absorption and NdFeB alloy ingot surface activity is related to the surface of the fresh, large active alloy ingots hydrogen explosion short time, high efficiency. The presence of sufficient Nd-rich phase in the alloy is a prerequisite for the hydrogen burst at room temperature. The HD powder heat treatment, with the heating temperature increases, hydrogen is continuously released, to 10 73K when the mass fraction of hydrogen in the magnetic powder has been reduced to 1.5 × 10 - 5, the basic release of hydrogen. HD powder production can be heated by 5 2 3 ~ 72 3K 1h hydrogen after the magnetic field forming, in order to reduce the impact of hydrogen on HD powder forming degree of orientation