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加弧辉光离子Ni-Cr共渗层相结构的研究 总被引:2,自引:0,他引:2
采用加弧辉光离子渗金属技术 ,实现了在不同含碳量的普通碳钢表面的Ni Cr共渗 ,对共渗的合金元素 (Ni、Cr、C)分布进行了测定 ,并通过X射线衍射分析及透射电镜分析 ,研究了Ni Cr共渗层的相组成。结果表明 ,普通碳钢表面的Ni Cr共渗层均以γ (Fe,Ni)相为主 (固溶有Cr) ;45和T8钢共渗层在γ相基体上分布着碳化物 (Cr2 3 C6和Cr7C3 ) 3种碳钢在共渗层与基体过渡区均为合金珠光体 (α相和 (Fe,Cr) 3 C)结构 相似文献
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Applying a novel method of arc-glow plasma depositing, a 2 lain-thick coating with 12 sub-layers of TiN and CrN was deposited alternately on the surface of magnesium alloy AZglD to improve its wear resistance. The wear behavior was investigated by test of ball on disc sliding. The composition and microstructure of the coating were also analyzed by means of X-ray diffraction (XRD) and glow discharge spectrum (GDS), and the morphology of TiN-CrN film was surveyed through scanning electronic microscopy (SEM) and atom force microscopy (AFM).The adhesion strength between film and matrix was evaluated by ways of stick-peeling test. The surface micro-hardness of the coating is above HK0.011 433, and the specific wear ratio of specimens coated with TiN-CrN films tested decreases greatly compared to that of the bare metal. 相似文献
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介绍一种新的表面合金化技术-加弧辉光离子渗金属技术以及其基本原理和实验装置。列举了碳钢试样加弧辉光离子渗钛处理,并对其渗层显微组织、合金成分及相组成进行了分析讨论;采用数学处理方法计算了钛在γ-Fe中的扩散系数,讨论了扩散系数与合金元素浓度的关系。 相似文献
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镁合金微弧氧化陶瓷膜的微观结构、相成分和耐腐蚀性能 总被引:7,自引:1,他引:6
为获得耐腐蚀性优良的镁合金表面膜层,在含5 g/L硅酸钠、2 g/L磷酸钠和1 g/L氢氧化钠的复合溶液中,用自制设备对AZ91D镁合金进行了微弧氧化.利用扫描电镜和X射线衍射分析了AZ91D 镁合金表面微弧氧化陶瓷膜的表面形貌、截面结构和相组成.结果表明:AZ91D 微弧氧化陶瓷膜由疏松层和致密层组成,疏松层陶瓷膜疏松,厚度较大,且存在一些孔洞;致密层陶瓷膜与基体金属结合紧密,陶瓷膜主要由MgO,Mg2SiO4,Mg3(PO4)2和MgAl2O4组成.在3.5%的NaCl溶液中,微弧氧化陶瓷膜的自腐蚀电位为-1 390 mV,而镁合金基体的为-1 540 mV,表明经微弧氧化处理后AZ91D 镁合金的耐蚀性有较大提高. 相似文献