热等静压烧结通常用来促进合金致密化和细化组织.本文尝试对Nd32.54DY0.5 Fe65.36Al0.6B1.0预烧结体分别进行热等静压烧结和常规烧结,旨在研究热等静压烧结能否促进Nd-Fe-B合金的致密化和晶粒细化.首次发现:高温热等静压烧结时,预烧结样品内的部分富Nd液相外流,在样品内形成空洞,被高压Ar气填充,造成样品不能收缩,磁体的密度比常规烧结磁体的低,力学性能明显恶化;且液相外流引起晶粒转动,导致取向度降低,最终磁体的剩磁和磁能积降低.
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