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摘要: 通过改变MoS2（质量分数1.0%~2.0%）和石墨（质量分数0~1.0%）的成分比例，在一定滑动线速度下，测量青铜基含油轴承承受压强的极限值，研究MoS2和石墨含量对青铜基含油轴承的力学性能和摩擦性能的影响。结果表明：在不加入石墨的情况下，随着MoS2含量的增加，含油轴承的负荷×线速度（pv）极限值降低，其中青铜-1MoS2（MoS2质量分数1.0%）含油轴承极限pv值最高，达到2.940 MPa·m·s-1；在同时加入石墨和MoS2的情况下，随着石墨含量的增加，含油轴承的摩擦因数降低，其中青铜-1MoS2/-1石墨（MoS2质量分数1.0%，石墨质量分数1.0%）含油轴承摩擦因数最低，为0.038；石墨能够改善含油轴承的摩擦性能，但是会大幅度降低其力学性能。Abstract: By changing the contents of MoS2 (mass fraction 1.0%~2.0%) and graphite (mass fraction 0~1.0%), the bearing pressure limit value of bronze oil bearing at the certain sliding linear velocity was measured, the effects of MoS2 and graphite contents on the mechanical and frictional properties of bronze oil bearing were studied. The results show that, the limit value of load×linear velocity (pv) for the oil bearings decreases with the increase of MoS2 content without graphite addition, and the bronze-1MoS2 (1.0%MoS2, mass fraction) oil bearing has the highest pv value of 2.940 MPa·m·s-1. In the case of adding graphite and MoS2 at the same time, the friction coefficient of the oil bearing decreases with the increase of the graphite content, and the bronze-1MoS2-1graphite (1.0%MoS2 and 1.0%graphite, mass fraction) oil bearing has the lowest friction coefficient of 0.038. Graphite can improve the friction properties of oil bearings, but it may greatly reduce the mechanical properties of oil bearings.
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Key words:
- bronze /
- oil bearing /
- friction /
- molybdenum disulfide /
- graphite
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图 1 未添加石墨、添加不同质量分数MoS2的轴承试样腐蚀前后的显微组织形貌：(a)青铜-1MoS2(MoS2质量分数1.0%)；(b)青铜-1.5MoS2(MoS2质量分数1.5%)；(c)青铜-2MoS2(MoS2质量分数2.0%)；(d)腐蚀后青铜-1MoS2；(e)腐蚀后青铜-1.5MoS2；(f)腐蚀后青铜-2MoS2
Figure 1. Microstructures of the bearing samples without graphite and with MoS2 in different mass fractions before and after corrosion: (a) bronze-1MoS2 (MoS2 mass fraction of 1.0%); (b) bronze-1.5MoS2 (MoS2 mass fraction of 1.5%); (c) bronze-2MoS2 (MoS2 mass fraction of 2.0%); (d) bronze-1MoS2 after corrosion; (e) bronze-1.5MoS2 after corrosion; (f) bronze-2MoS2 after corrosion
图 2 含质量分数1.0%MoS2且添加不同质量分数石墨的轴承试样腐蚀前后显微组织形貌：(a)青铜-1MoS2(不含石墨)；(b)青铜-1MoS2-0.5石墨(石墨质量分数0.5%)；(c)青铜-1MoS2-1石墨(石墨质量分数1.0%)；(d)腐蚀后青铜-1MoS2；(e)腐蚀后青铜-1MoS2-0.5石墨；(f)腐蚀后青铜–1MoS2-1石墨
Figure 2. Microstructures of the bearing samples with 1.0% MoS2 and graphite in different mass fractions before and after corrosion: (a) bronze-1MoS2 (without graphite); (b) bronze-1MoS2-0.5graphite (graphite mass fraction of 0.5%); (c) bronze-1MoS2-1graphite (graphite mass fraction of 1.0%); (d) bronze-1MoS2 after corrosion; (e) bronze-1MoS2-0.5graphite after corrosion; (f) bronze-1MoS2- 1graphite after corrosion
图 3 试样成分对轴承含油率的影响
Figure 3. Effect of the sample composition on the bearing oil content
图 4 试样成分对轴承硬度(a)和压溃强度(b)的影响
Figure 4. Effect of the sample composition on the hardness (a) and crushing strength (b) of bearings
图 5 试样成分对轴承极限pv值(a)和摩擦因数(b)的影响
Figure 5. Effect of the sample composition on the limit pv value (a) and friction coefficient (b) of bearings
图 6 7#试样的压坯、烧结样品和摩擦样品表面的X射线衍射图谱
Figure 6. XRD patterns of the compacted, sintered, and friction surfaces of 7# samples
图 7 在线速度为0.5 m·s-1条件下摩擦失效试样表面的扫描电子显微形貌和元素面分布能谱分析：(a)1#试样；(b)7#试样
Figure 7. SEM images and EDS analysis of the failure specimen surface by friction at the linear velocity of 0.5 m·s-1: (a) sample 1#; (b) sample 7#
表 1 铜基含油轴承主要成分含量(质量分数)
Table 1. Main composition of the bronze oil bearing
% 序号 Cu–10Sn MoS2 石墨 硬脂酸锌 1# 余量 1.0 0 0.6 2# 余量 1.5 0 0.6 3# 余量 2.0 0 0.6 4# 余量 1.0 0.5 0.6 5# 余量 1.5 0.5 0.6 6# 余量 2.0 0.5 0.6 7# 余量 1.0 1.0 0.6 8# 余量 1.5 1.0 0.6 9# 余量 2.0 1.0 0.6 
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