Fabrication and characterization of TiB2-TiC-Co wear-resistant coatings on AZ91D magnesium alloy
Fabrication and characterization of TiB2-TiC-Co wear-resistant coatings on AZ91D magnesium alloy
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AZ91D镁合金TiB2-TiC-Co耐磨涂层的制备及表征
DOI：
10.1016/j.surfcoat.2019.02.090
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发表时间：
2019-04
影响因子：
5.4
通讯作者：
Xueqiang Cao
中科院分区：
文献类型：
--
作者：
Jiagen Shen;Binlin Zou;Shujuan Dong;Xiaolong Cai;Xueqiang Cao
以Co-Ti-B4 C体系自蔓延高温合成（SHS）粉末为原料，采用常压等离子喷涂（APS）技术在AZ 91 D镁合金基体上制备了TiB 2-TiC-Co金属陶瓷涂层。为了提高金属陶瓷涂层与基体的结合稳定性，采用化学镀和APS相结合的方法制备了Ni-P/NiCrAlY中间层。研究了SHS产物和涂层的显微结构和相组成。讨论了金属陶瓷涂层的显微组织与磨损性能之间的关系。结果表明，中间层能有效地防止镁合金基体的氧化和烧蚀，并能与基体和金属陶瓷涂层紧密结合。三层涂层的拉伸破坏主要发生在NiCrAlY层与Nisingle粘结剂P层的界面处，结合强度为21.4 ± 3.2MPa。具有不同晶粒尺寸的TiB 2-TiC的两种金属陶瓷涂层由于其分别约1059和1018 HV的高硬度而为基底提供了良好的耐磨性。此外，由更细的陶瓷颗粒组成的金属陶瓷涂层具有更致密和均匀的结构，这导致磨损率和摩擦系数显着降低。金属陶瓷涂层对氧化铝球的磨损机制是硬质相剥落和微切削磨粒磨损的混合。
TiB2-TiC-Co cermet coatings were fabricated on AZ91D Mg alloy substrate by atmospheric plasma spraying (APS) using the powders produced by self-propagating high-temperature synthesis (SHS) from Co-Ti-B4C system. In order to improve the bonding stability between cermet coating and substrate, the interlayer of Ni-P/NiCrAlY was prepared by the combination of electroless and APS methods. Microstructure and phase composition of the SHS products and coatings were investigated. Correlation between microstructure and wear properties of the cermet coatings was discussed. The results showed that the interlayer prevented Mg alloy substrate from oxidation or ablation, and bonded tightly to both the substrate and cermet coating. The tensile failure of triple-layer coatings was mainly located at the interface between the NiCrAlY layer and Nisingle bondP layer, with the bonding strength of 21.4 ± 3.2 MPa. The two cermet coatings with different grain sizes of TiB2-TiC provided good wear resistance for substrates owing to their high hardness of about 1059 and 1018 HV,respectively. Moreover, the cermet coating composed of finer ceramic particles exhibited a more compact and uniform structure, which led to a significant reduction in wear rate and friction coefficient. The wear mechanisms of cermet coatings against alumina-ball counterpart were a mix of exfoliation of hard phases and abrasive wear by micro-cutting.
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影响因子：
4.4
作者：
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通讯作者：
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采用环保无氟镀液在 AZ91D 镁合金上进行双层 Ni-B/Ni-P 涂层的化学沉积和表征
影响因子：
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通讯作者：
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影响因子：
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作者：
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