田兴达,李涌泉,王存喜,梁国栋.DZ125合金表面Cr-Al-Y涂层抗高温氧化性能及摩擦性能[J].表面技术,2023,52(9):170-177.
TIAN Xing-da,LI Yong-quan,WANG Cun-xi,LIANG Guo-dong.High Temperature Oxidation Resistance and Friction Properties of Cr-Al-Y Coating on DZ125 Alloy[J].Surface Technology,2023,52(9):170-177 |
| DZ125合金表面Cr-Al-Y涂层抗高温氧化性能及摩擦性能 |
| High Temperature Oxidation Resistance and Friction Properties of Cr-Al-Y Coating on DZ125 Alloy |
| 投稿时间：2022-09-02 修订日期：2022-11-12 |
| DOI：10.16490/j.cnki.issn.1001-3660.2023.09.013 |
| 中文关键词: DZ125合金 Cr-Al-Y涂层 高温氧化 氧化膜 耐磨性 磨损率 |
| 英文关键词:DZ125 Cr-Al-Y coating high temperature oxidation oxide film wear resistance wear rate |
| 基金项目:国家自然科学基金(51961003，52161009);宁夏自然科学基金(2020AAC02025) |
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| 中文摘要: |
| 目的 提高DZ125合金的抗高温氧化性能和耐磨性。方法 采用包埋渗技术在DZ125合金表面制备Cr-Al-Y涂层，分析Cr-Al-Y涂层经高温氧化后的组织结构和相组成，对比研究涂层与基体的摩擦行为。结果 Cr-Al-Y涂层具有多层组织结构，经高温氧化100 h后，涂层的平均质量损失量仅为0.85 mg/cm2。由于在高温氧化过程中Cr-Al-Y涂层形成了连续致密的Al2O3和Cr2O3氧化膜，随着氧化温度的升高，涂层表面的氧化速率增大，导致氧化产物剥落，并出现表面缺陷。Cr-Al-Y涂层的摩擦因数明显低于DZ125基体的摩擦因数，DZ125合金的摩擦因数约为0.45，Cr-Al-Y涂层的摩擦因数约为0.2。在摩擦过程中，DZ125合金发生了犁削磨损和磨粒磨损，涂层表面发生了磨粒磨损。结论 该涂层具有优异的抗高温氧化性能，连续致密的Al2O3氧化膜和Cr2O3氧化膜能够有效阻挡氧化性气氛与基体直接接触，从而降低氧化速率。Cr-Al-Y涂层的摩擦因数明显低于DZ125基体的摩擦因数，在磨损过程中涂层表面的氧化膜能有效阻挡GGr15球与基体发生直接接触式对磨，并且形成的Al2O3和Cr2O3起到了润滑相的作用，从而减小了摩擦因数，降低了磨损率，提高了合金的耐磨性。 |
| 英文摘要: |
| In order to improve the high temperature oxidation resistance and wear resistance of DZ125 alloy, Cr-Al-Y coating was prepared on the surface of DZ125 alloy by pack cementation technology. The microstructure and phase composition of Cr-Al-Y coating after high temperature oxidation were analyzed and the friction behavior between the coating and the substrate was compared. The results showed that the prepared Cr-Al-Y coating had a multi-layer structure. The Cr-Al-Y coating of DZ125 prepared by embedding infiltration at 1 050 ℃ for 2 h had a multilayer structure. The outer layer was composed of Ni3Cr2 and Al2O3, the middle layer was composed of Ni3Cr2 and a small amount of Ni3Al, and the inner layer was composed of Ni3Al and the average weight loss of the coating was only 0.85 mg/cm2 after 100 hours of high temperature oxidation. During the high temperature oxidation process, the Cr-Al-Y coating formed continuous and dense Al2O3 and Cr2O3 oxide films. The Al element in the coating was accelerating outward diffusion, forming a new oxide film, and then repairing the oxide film. This process intensified the oxidation rate of the coating surface. With the increase of oxidation temperature, the oxidation rate of the coating surface intensified, resulting in the peeling of oxidation products and surface defects. The friction coefficient of Cr-Al-Y coating was obviously lower than that of DZ125 substrate. The friction coefficient of DZ125 alloy was about 0.45. The friction coefficient of Cr-Al-Y coating was about 0.2. The friction coefficient increased gradually with the wear time. After 15 minutes of wear, the friction coefficient of the coating tended to be stable, and the friction coefficient was about 0.25. Ploughing wear and abrasive wear occurred on DZ125 alloy during the friction process, while abrasive wear occurred on the coating surface. The high temperature oxidation kinetic curve of Cr-Al-Y coating showed a law of weight increase firstly and weight loss later. Cr-Al-Y coating showed a stable oxidation rate. The coating had excellent high temperature oxidation resistance. The continuous and dense Al2O3 oxide film and Cr2O3 oxide film could effectively block the direct contact between the oxidizing atmosphere and the substrate, thus reducing the oxidation rate. The friction coefficient of Cr-Al-Y coating was significantly lower than that of DZ125 substrate, mainly because the oxide film on the coating surface could effectively prevent the direct contact abrasion between GGr15 ball and substrate during the wear process, and the Al2O3 and Cr2O3 formed also acted as lubricating phases, thus reducing the friction coefficient and the wear rate and improving the wear resistance of the alloy. The overall oxidation degree of the coating surface was relatively low, while the iron content was high. The main reason was that during the sliding process, the oxide film could effectively prevent the direct contact between the GGr15 ball and the alloy substrate, and the friction pair only contacted the surface. At the same time, the small protrusions on the surface reduced the contact area of the two friction pairs and the friction coefficient. The wear marks on the surface of DZ125 alloy were oxidized, and the black phase structure was oxidized seriously, thus reducing the wear rate during the friction process and improving the wear resistance of the coating. |
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