| dc.description.abstract | Thermally sprayed coatings allows to increase base surface functionality and add parameters,
which base material did not had before. This feature opens the door to the
application and design improvements in leading developments of aircraft, spacecraft, automotive,
biomedical, marine and offshore industries. In this research, the main object
is thermally sprayed SiC coatings with modified SiC powder feedstock. Two different
powder preparation techniques are compared in order to optimize the nano-layer, which
surrounds and protects the spray powder. It allows thermally challenging particles could
reach the substrate surface without decomposing.
The main scope of the work is to analyse how powder feedstock preparation technique
influence end product properties. SiC coatings are sprayed with plasma thermal spraying
gun variating the spray properties. The XRD cross analysis of powder feedstock and
SiC coatings were conducted, revealing, that SiC particles are delivered to the substrate
resulting in high crystallinity of SiC particles.
Afterwards, the thermal oxidation tests in TGA device were carried out. The weight
loss after 30 min holding in 1200C, showed 6.5% to 8.5% weight loss. Tribological tests
were carried out in three different conditions, with 440C stainless steel, WC-Co and SiC
carbide counterparts. Morphology of the coatings were analysed with SEM, EDS and
Confocal microscopy. Some of the test results, especially in regards of chemical analysis,
are protected by confidentiality agreement with Seram Coatings AS . | en |
