Page 20 - 《摩擦学学报》2020年第5期

第 5 期 胡华民, 等: 横向交变载荷下TiCN/MoS 2 涂层螺栓的防松性能研究 575

表 1 M12螺栓参数 显变化，但与复合涂层螺母配合时，螺纹表面的磨损
Table 1 The parameters of M12 bolts 区域由中部转变为牙顶处，其原因是高预紧力下复合
Parameters Specification
涂层螺栓/螺母接触更紧密，而与无涂层螺母配合时螺
Minor diameter of screw thread，d 1 /mm 10.106
纹表面损伤区域未发生转变.
Pitch diameter of screw thread，d 2 /mm 10.863
图8示出了预紧力优化条件下复合涂层螺栓与复
Nominal diameter of screw thread，d/mm 12.000
Half angle of screw thread profile，α 30° 合涂层螺母、无涂层螺母配合时螺纹表面形貌的
Pitch of screw thread，P/mm 1.750
SEM照片和EDX成分. 从图8(a)可以看出，复合涂层螺
0.211
Friction coefficient between uncoated bolt/nut threads，μ t
Friction coefficient between composite coated bolt/nut 栓/螺母配合时，螺纹表面出现明显剥落现象，其磨损
0.120
机制为疲劳磨损. 从图8(b)可以看出，复合涂层螺栓/
threads，μ t
Friction coefficient between composite coated bolt/uncoated
0.174 无涂层螺母配合时，螺纹表面呈现明显的剥落现象，
nut threads，μ t
并伴随细小的犁沟现象，说明其存在疲劳磨损和磨粒

1 mm 1 mm

(a) Composite coated bolt/nut (b) Composite coated bolt/uncoated nut
Fig. 7 OM morphologies of composite coated bolt thread surfaces under equivalent preload
图 7 等效预紧力下复合涂层螺栓螺纹OM形貌

MoS Point A
O
C Fe Ti
A Ti Fe Fe
Ti Point B
Counts
B
CO Ti
MoS
C MoS Point C
O
C Fe Ti Ti Fe Fe
200 μm 50 μm 0 1 2 3 4 5 6 7 8
Energy/keV
(a) Composite coated bolt/nut

Ti Point A
A
C O MoS Ti Ti
Counts
B Ti Point B
C C O MoS Ti Fe
MoS Point C
O
C Fe Ti Ti Fe
200 μm 50 μm 0 1 2 3 4 5 6 7 8
Energy/keV
(b) Composite coated bolt/uncoated nut
Fig. 8 SEM micrographs and EDX results of composite coated bolt thread surfaces under the optimized preload
图 8 预紧力优化后复合涂层螺栓螺纹形貌的SEM照片和EDX成分分析