(太原理工大學 表面工程研究所，太原 030024)
摘 要: 對QBe1.9銅合金進行雙輝等離子滲Ti及后續(xù)離子氮化復合處理，在其表面制備TiN(Ti2N)/Ti合金層以改善其摩擦磨損性能。采用掃描電鏡、能譜、輝光放電光譜儀、X射線衍射儀等手段觀察分析Ti-N復合滲合金層的組織、成分及相結構，對合金層硬度及導電性進行了分析，并利用往復球盤摩擦磨損試驗機研究QBe1.9基材及其Ti-N復合滲后的摩擦磨損性能。結果表明：經(jīng)過Ti-N復合處理后，在QBe1.9銅合金表面形成厚度為27 μm的復合滲層，該滲層包括表面富TiN(Ti2N)合金層和Ti-Be-Cu擴散過渡層；QBe1.9銅合金經(jīng)Ti-N復合滲后，表面硬度達964 HV，比基材的硬度明顯提高；摩擦因數(shù)和比磨損率分別僅為未處理基材的30%和1.38%，達到減摩耐磨效果。表面高硬氮化物的形成是Ti-N復合滲改善QBe1.9銅合金表面性能的主要原因。
關鍵字: QBe1.9銅合金；等離子滲Ti；離子氮化；導電性；摩擦；磨損
（Research Institute of Surface Engineering, Taiyuan University of Technology, Taiyuan 030024, China）
Abstract:The plasma titanizing and plasma nitriding were applied in QBe1.9 alloy to improve its wear resistance. The microstructure, concentration and phase structure were studied by SEM, SED, GDOES and XRD. The hardness, electrical conductivity and tribological property by reciprocating ball-on-disk test after Ti-N duplex treatment were investigated as well. The results show that, after plasma titanizing and nitriding treatments, a modified layer with thickness of 27 μm forms on QBe1.9 surface, which contains surface TiN(Ti2N)-rich layer and Ti-Be-Cu diffusing layer beneath. The surface hardness after Ti-N duplex treatment reaches 964 HV, higher than that of untreated QBe1.9. The average friction coefficient and wear rate of Ti-N duplex-treated QBe1.9 alloy are only 30% and 1.38% of those of the untreated QBe1.9 alloy, showing good combination of antifriction and wear resistance. The improved properties of QBe1.9 alloy effectively after Ti-N complex treatment is attributed to the hard TiN(Ti2N) forming on the surface.
Key words: QBe1.9 alloy; double glow plasma alloying; plasma nitriding; conductivity; friction; wear
