CAJ | 학술논문

为提高钛合金表面耐磨性能，运用电火花沉积技术在TC11钛合金表面原位反应沉积TiN强化层，研究N2流量对强化层显微组织和摩擦学性能的影响。结果表明：当N2流量过小时，强化层厚度较薄，主要由Ti2N、α-Ti、TiO和TiN等相组成，电火花快速放电导致基体表面产生的熔池急速冷凝，使得亚稳态Ti2N相保留在强化层中；当N2流量过大时，强化层微裂纹和孔洞等缺陷较多；而当N2流量适中时，强化层主要由TiN等物相组成，且致密均匀(50~55μm)，平均显微硬度达HV0.21165.2，是TC11钛合金基体的3.4倍。当N2流量适中时，TiN强化层的耐磨性能最好，此时其磨损质量为0.4 mg，是TC11基体的2/9，其主要磨损机理为微观切削磨损和多次塑变磨损。
위제고태합금표면내마성능，운용전화화침적기술재TC11태합금표면원위반응침적TiN강화층，연구N2류량대강화층현미조직화마찰학성능적영향。결과표명：당N2류량과소시，강화층후도교박，주요유Ti2N、α-Ti、TiO화TiN등상조성，전화화쾌속방전도치기체표면산생적용지급속냉응，사득아은태Ti2N상보류재강화층중；당N2류량과대시，강화층미렬문화공동등결함교다；이당N2류량괄중시，강화층주요유TiN등물상조성，차치밀균균(50~55μm)，평균현미경도체HV0.21165.2，시TC11태합금기체적3.4배。당N2류량괄중시，TiN강화층적내마성능최호，차시기마손질량위0.4 mg，시TC11기체적2/9，기주요마손궤리위미관절삭마손화다차소변마손。
In order to improve the tribological properties of titanium alloys, the in-situ TiN coatings were prepared by electrospark deposition (ESD) on the surface of TC11 titanium alloy. The effects of nitrogen flux on the microstructure and tribological properties of TiN coatings were investigated. The results show that the coating is relative thin when the nitrogen flux is small and mainly consists of Ti2N,α-Ti, TiO and TiN phases, and the metastable phase of Ti2N is developed due to the rapid solidification of ESD. While in excessive nitrogen flux condition, many micro-cracks and holes might be generated in the coating. In moderate nitrogen flux, the coating is mainly composed of TiN phase, and is dense and uniform (50?55 μm). The average hardness is HV0.2 1165.2, which is 3.4 times that of the TC11 substrate. The TiN coatings prepared in moderate nitrogen flux perform the best wear resistance. The wear loss of the coating is 0.4 mg, which is 2/9 that of the TC11 substrate. The main wear mechanisms of the coatings are micro-cutting wear accompanied by multi-plastic deformation wear.