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本文研究了添加直径为0.08mm、长度为2mm、添加量0～16wt%、等原子比的NiTi合金短纤维对Ti(C,N)基金属陶瓷组织和性能的影响,试样采用粉末冶金的方法制备,采用OM、XRD、SEM等对其进行分析。结果表明,压制成型时,随着NiTi短纤维加入量的增加,原料的流动性逐渐变差,导致压成的素坯的致密度降低;在烧结过程中,由于大部分Ni形成Ni-Co固溶体或被蒸发,因此大部分NiTi合金的原子比被破坏,烧结时液态的NiTi会填充试样内部的空隙,由于素坯的致密度较低,液相不能完全填充,导致在冷却后金属陶瓷中出现了许多孔洞,且随着NiTi合金短纤维加入量的增加,金属陶瓷的孔洞逐渐增加,其致密度和抗弯强度也随着下降。
In this paper, the effects of addition of NiTi alloy staple fibers with the diameter of 0.08mm, the length of 2mm, the additive amount of 0-16wt% on the microstructure and properties of Ti (C, N) -based cermets were investigated. The samples were made by powder metallurgy Methods of preparation, using OM, XRD, SEM and other analysis. The results show that with the increase of NiTi short fiber addition, the flowability of the raw material becomes worse, resulting in the decrease of the compact density of the pressed green body. In the sintering process, most of Ni forms Ni-Co solid solution Or evaporated. Therefore, the atomic ratio of most NiTi alloys is destroyed. During sintering, NiTi in the liquid state fills the voids in the sample. Due to the lower density of the green body, the liquid phase can not be completely filled, Many holes appeared. With the increase of NiTi alloy short fiber, the porosity of cermets increased gradually, and the density and flexural strength decreased as well.