Abstract
Cr-C deposits were electroplated on a pure Cu substrate in a Cr+3-based plating bath. After electroplating, the Cr-C deposits with and without a Cu substrate were flame-heated for 2 s to increase their hardness. Experimental results show that the hardness and crack density of a flame-heated Cr-C deposit were strongly affected by the Cu-substrate thickness. The hardness of as-plated Cr-C deposit with a Cu substrate increased from 750 to 1600 Hv after flame heating, while a low hardness value of 970 Hv was detected from the flame-heated Cr-C deposit without a Cu substrate. Increase in hardness values of flame-heated Cr-C deposits is attributed to precipitation of crystalline diamond membranes. Fully crystalline diamond-like membranes were found in the flame-heated Cr-C deposit with a Cu substrate; while semi-crystalline diamond-like membranes were detected in the flame-heated deposit without a Cu substrate. The constraint effect of the Cu substrate induced a high internal tension stress in the Cr-C deposit during and after flame heating, leading to widening through-deposit cracks and increasing the deposit hardness.
| Original language | English |
|---|---|
| Pages (from-to) | 2-7 |
| Number of pages | 6 |
| Journal | Vacuum |
| Volume | 120 |
| DOIs | |
| State | Published - 01 10 2015 |
Bibliographical note
Publisher Copyright:© 2015 Elsevier Ltd. All rights reserved.
Keywords
- Diamond-like phase
- Hardness
- Microstructure
- Trivalent chromium ions
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