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超声纳米晶表面改性后 Cr₃C₂–NiCr 涂层的硬度与划痕后表面形貌
HARDNESS AND POST-SCRATCH SURFACE MORPHOLOGY OF Cr₃C₂–NiCr COATINGS AFTER ULTRASONIC NANOCRYSTAL SURFACE MODIFICATION
Journal of Surface Engineering and Coating Technology
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UNSM处理Cr3C2-NiCr涂层硬度样品依赖，参数缺
AI理解
要点 UNSM 处理 DS 与 HVOF 沉积 Cr₃C₂–NiCr 涂层：DS 硬度 820–970 HV、HVOF 546–1165 HV，最优参数分别为 20N/20µm 与 30N/30µm；划痕后形貌呈不均匀对比，未建立划痕抗力排序。
能不能用 涉及热喷涂涂层（DS/HVOF）的后处理工艺（UNSM），对热喷涂产线有直接参考价值。摘要给出 UNSM 参数（20/30 N、20/30 µm）与硬度测试条件（300 mN/10s），但未给 DS/HVOF 喷涂参数与涂层厚度，无法完整复现工艺窗口。
存疑
- 缺工艺：DS/HVOF喷涂参数与涂层厚度未给
- 划痕形貌观察为定性证据，未单独区分UNSM损伤，未建立划痕抗力排序
中文摘要
考察了经超声纳米晶表面改性（UNSM）的 Cr₃C₂–NiCr 涂层的硬度与划痕后表面形貌，涉及爆炸喷涂（DS）和超音速氧燃料（HVOF）沉积。每条沉积路线评估四种处理样品，静载为 20 和 30 N，振动振幅为 20 和 30 µm。仪器化硬度在 300 mN 载荷、10 s 保载时间下测量。DS 样品硬度值为 820–970 HV，而 HVOF 样品覆盖更宽的 546–1165 HV 范围。最高值记录于 20 N/20 µm 条件下的 DS-T1 和 30 N/30 µm 条件下的 HVOF-T4。划痕测试后采集的 SEM 视场显示，两个涂层系列均存在不均匀表面对比和裂纹状不连续。这些观察为测试后的表面状态提供了定性证据，但未单独区分 UNSM 造成的损伤，也未建立划痕抗力排序。六个处理样品的平均摩擦系数作为补充观察报告。结果表明硬度响应具有样品依赖性，并强调需要将局部力学性能与表面完整性一起评估。
查看英文摘要
The hardness and post-scratch surface morphology of Cr₃C₂–NiCr coatings subjected to ultrasonic nanocrystal surface modification (UNSM) were examined for detonation-sprayed (DS) and high-velocity oxy-fuel (HVOF) deposits. Four treated samples per deposition route were evaluated at static loads of 20 and 30 N and vibration amplitudes of 20 and 30 µm. Instrumental hardness was measured at a load of 300 mN with a dwell time of 10 s. The DS samples exhibited hardness values of 820–970 HV, whereas the HVOF samples covered the wider range of 546–1165 HV. The highest values were recorded for DS-T1 at 20 N/20 µm and HVOF-T4 at 30 N/30 µm. SEM fields acquired after scratch testing showed heterogeneous surface contrast and crack-like discontinuities in both coating series. These observations provide qualitative evidence of the post-test surface condition but do not isolate damage caused by UNSM or establish a ranking of scratch resistance. Available mean friction coefficients are reported as supplementary observations for six treated samples. The results demonstrate a sample-dependent hardness response and emphasize the need to assess local mechanical properties together with surface integrity.
摘要中给出的工艺参数
| 其他 | UNSM静载20/30N、振幅20/30µm；硬度测试300mN载荷/10s保载 |
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原文依据
查看原文依据
- The hardness and post-scratch surface morphology of Cr₃C₂–NiCr coatings subjected to ultrasonic nanocrystal surface modification (UNSM) were examined for detonation-sprayed (DS) and high-velocity oxy-fuel (HVOF) deposits.
- The DS samples exhibited hardness values of 820–970 HV, whereas the HVOF samples covered the wider range of 546–1165 HV.
- These observations provide qualitative evidence of the post-test surface condition but do not isolate damage caused by UNSM or establish a ranking of scratch resistance.