新闻资讯
AZ91D镁合金等离子喷涂Ni-Al/陶瓷涂层的组织和性能
发布人：上海艾荔艾金属材料有限公司www.shailiai.com
更新时间：2015-10-13
以Ni-Al为粘结层，在AZ91D镁合金基体上等离子喷涂Ni-Al/Al2O3、Ni-Al/Al2O3-13%TiO2 (Ni-Al/AT13)、Ni-Al/Al2O3-20%TiO2(Ni-Al/AT20)复合涂层及Ni-Al/Al2O3/Al2O3-13%TiO2/Al2O3-20%TiO2 (Ni-Al/Al2O3/AT13/AT20) 梯度涂层，利用SEM、EDS和XRD分析涂层的微观组织特征，通过硬度、拉伸和热震实验研究涂层硬度、结合强度和抗热震性能，并与直接喷涂Al2O3、AT20的涂层进行比
AZ91D镁合金等离子喷涂Ni-Al/陶瓷涂层的组织和性能Microstructure and properties of Ni/Al/ceramic coatings plasma-sprayed on AZ91D magnesium alloy
以Ni-Al为粘结层，在AZ91D镁合金基体上等离子喷涂Ni-Al/Al2O3、Ni-Al/Al2O3-13%TiO2 (Ni-Al/AT13)、Ni-Al/Al2O3-20%TiO2(Ni-Al/AT20)复合涂层及Ni-Al/Al2O3/Al2O3-13%TiO2/Al2O3-20%TiO2 (Ni-Al/Al2O3/AT13/AT20) 梯度涂层，利用SEM、EDS和XRD分析涂层的微观组织特征，通过硬度、拉伸和热震实验研究涂层硬度、结合强度和抗热震性能，并与直接喷涂Al2O3、AT20的涂层进行比较。结果表明：Ni-Al粘结层因“自粘结”效应与基体形成较为致密并具有冶金结合的界面，且与Al2O3、AT13和AT20陶瓷层互有渗透、交叉和啮合，涂层致密性及结合力大为提高，表现出优良的抗热震性能。Al2O3涂层主要由亚稳态γ-Al2O3组成，AT20涂层以Al2O3和Al2TiO5为主。镁合金表面喷涂Al2O3陶瓷层后硬度大幅提高，由于加入TiO2，AT13和AT20涂层的硬度略低于Al2O3涂层的。Ni-Al/Al2O3-TiO2复合陶瓷的涂层结合强度高于Ni-Al/Al2O3单一陶瓷涂层的，而Ni-Al/ Al2O3/AT13/AT20梯度涂层的结合强度比Ni-Al/AT20涂层的更高。
By means of plasma spraying, Ni-Al/Al2O3, Ni-Al/Al2O3-13%TiO2 (Ni-Al/AT13) and Ni-Al/Al2O3-20%TiO2(Ni-Al/AT20) composite coatings as well as Ni-Al/Al2O3/Al2O3-13%TiO2/Al2O3-20% TiO2 (Ni-Al/Al2O3/AT13/AT20) gradient coating were fabricated on the AZ91D magnesium alloy with Ni-Al as the base coating. The microstructure characteristics of the coatings were investigated by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) and X-ray diffractometry (XRD). The hardness, bonding strength and thermal shock properties of the coatings were evaluated by microhardness, tensile and thermal shock tests. The coatings with Ni-Al as the base coating were compared with Al2O3 and AT20 coatings without Ni-Al. The results show that denser interface with metallurgical bonding forms between Ni-Al and AZ91D substrate due to Ni-Al base coating’s self adhesive effect. Ni-Al coating can interpenetrate into, cross and gear with Al2O3, AT13 and AT20 coatings, thus remarkably improving the compactness, bonding strength and resistance to thermal shock. Al2O3 coating is mainly composed of metastable γ-Al2O3 while AT20 coating mainly consists of Al2O3 and Al2TiO5. After plasma sprayed with Al2O3 coating, the surface hardness of AZ91D alloy increases evidently. The hardness of AT13 as well as AT20 coatings is slightly lower than that of Al2O3 coating because of the addition of TiO2. The bonding strength of Ni-Al/Al2O3-TiO2 composite ceramic coating is higher than that of Ni-Al/Al2O3 single ceramic coating and Ni-Al/Al2O3/AT13/AT20 gradient coating shows high bonding strength than Ni-Al/AT20 coating.
以上资料由上海艾荔艾金属材料有限公司提供，欢迎新老客户来电洽购。
本文来自上海艾荔艾金属材料有限公司http://www.shailiai.com，转载请注明出处。