A novel method for metal–diamond composite coating deposition with cold spray and formation mechanism

Abstract

Rocco (2016) A novel method for metal-diamond composite coating deposition with cold spray and formation mechanism. Scripta Materialia, 115 . pp. 10-13. ISSN 1359-6462 Access from the University of Nottingham repository: http://eprints.nottingham.ac.uk/38904/1/Diamond%20Paper-Revised%20v3-accepted %20version.pdf The version presented here may differ from the published version or from the version of record. If you wish to cite this item you are advised to consult the publisher's version. Please see the repository url above for details on accessing the published version and note that access may require a subscription.

Advanced diamond-reinforced metal matrix composites via cold spray: Properties and deposition mechanism

“…In our previous work, even higher value of 56 wt.% was obtained by the EDS 188 measurements. However, it is rather safe not to attribute the difference to a change in deposition efficiency 189 as the higher value was obtained from coating fracture (i.e., not polished) surfaces [34]. In the previous cold …”

“…Diamond-reinforced metal matrix composites (DMMC) are novel materials in which the metallic phase 33 acts as a binder (yielding the DMMC deformable and machinable), while the reinforcement diamond phase 34 helps to improve the material properties. Currently, the common ways to fabricate bulk DMMC are powder techniques for producing bulk DMMC, these thermal spray techniques also require high working 42 temperatures and the films/coatings therefore potentially face identical problems (in particular, 43 graphitization of the diamond content [17]).…”

“…In order to avoid the 70 disadvantages and problems associated with using the conventional pre-mixed or ball-milled feedstock, a 71 novel copper-clad diamond powder (and its mixture with copper powder) was used as the feedstock to 72 fabricate the coatings instead. In the previous work, this copper-clad diamond powder has been proven to 73 significantly increase the diamond contents in the coating [34]. As the base material, copper was selected 74 due to its ease of deposition and high deposition efficiency, allowing it to be an excellent binder in the MMC The annotation of the produced coatings as well as the respective feedstock information and cold spray 91 deposition conditions are provided in Table 1.…”

“…9c, the diamond phase observed a frequent cracking, producing 245 small diamond shards surrounding the parent particles. In such cases, bonding occurred between the thin 246 copper claddings only and the coating was formed through the fractured diamond sub-particles uniformly 247 dispersing into the metal phase [34]. Following the coating microstructure analysis, the following deposition mechanisms are suggested 252 herein.…”

Effect of spray angle on Ni particle deposition behaviour in cold spray

“…Such investigation is of great importance for a better understanding of the bonding mechanism between coating and substrate. For example, Aldwell et al [25] observed the fracture morphology and impact morphology of deposited particle by using cavitation test, which gave some important insight into bonding features. Chen et al [24] successfully observed the dimple-like fractures on contact surface of deposited particle which is detached from substrate by a tensile test machine.…”