Cu14Al4.5FeNi合金等离子涂层边界润滑摩擦磨损特性

新型铜基模具材料的脆性比较大，导致了材料加工费用高、安装难，影响新型铜基模具材料在工业中的应用，这些问题可以通过热喷涂的办法来解决。采用等离子喷涂方法在45号钢表面制取Cu14Al4.5FeNi喷涂层，20#边界润滑条件下，与Cu14Al4.5FeNi合金进行摩擦性能及耐磨性对比试验。利用XRD分析喷涂层及合金的相结构，SEM和EDS 等技术分析合金与喷涂层表面组织及磨损形貌。结果表明, 等离子喷涂层由于快冷抑制了共析（α+γ2）相，组织均匀细化，晶粒中的γ2相和晶内析出的k相使合金及涂层硬化。边界润滑条件下，Cu14Al4.5FeNi合金及其喷涂层的磨损方式以磨粒磨损和黏着磨损为主。在低载荷条件下，喷涂层表现出了比Cu14Al4.5FeNi合金更加优越的耐磨性能；在高载荷条件下（压力大于等于6.4 MPa），喷涂层的摩擦系数和磨损量增加。因此铁基体上等离子喷涂Cu14Al4.5FeNi铜合金粉末涂层可以替代低载荷摩擦环境下的Cu14Al4.5FeNi合金。

Tribological Property of Cu14Al4.5FeNi Bronze and Its Plasma Sprayed Coating

The expense and difficulty of machining novel aluminum bronze blocks in some zones of dies and the difficulty of installing due to the brittleness of the blocks can be solved by using the aluminum bronze coating.Cu14Al4.5FeNi coating was prepared on a 45# carbon steel substrate by plasma spraying.Friction and wear of the coating and Cu14Al4.5FeNi alloy under boundary lubrication regime in a 20# engine oil were comparativelly investigated in a reciprocating sliding mode.Scanning electron microscopy,energy di...