Abstract
Our goal is to develop a structural ceramic for high-temperature applications in which silicon carbide-based materials (SiCs) are used as matrix composites. The potential of SiCs to deposit a mixture of SiC and zirconium diboride (ZrB2) plasma spray coating is analyzed. To deposit thermal barrier layers containing up to 50 vol.% SiC, a high-pressure plasma spray (HPPS) process was used. Although the SiC cannot be deposited by thermal spray, a mixture of SiC and zirconium diboride (ZrB2) was deposited because these two compounds form a eutectic phase at a temperature below SiC decomposition. The preference was two different forms, 3 mm and 1 mm, of graphite substrates with different thickness values. A comparison of the morphology of SiC-ZrB2 coatings before and after thermal treatment was performed by applying heat to the surface of a gas torch and traditional furnace between 800 °C and 1200 °C. The growth of the oxide scale was calculated with X-ray diffraction (XRD), scanning electron microscopy (SEM)/energy dispersive X-ray analysis (EDX), transmission electron microscopy (TEM), and density. The oxide scale consists of a SiO2 layer with ZrO2 groups. The findings indicate a greater potential for the studied material in protecting against high-temperature oxidation and in a wide variety of aerospace applications.
Highlights
Because of their many uses, ultra-high-temperature ceramics (UHTCs) are considered highly significant, for example, for use in spacecraft applications and wall defense shields in nuclear reactors [1,2]
Superalloys have shown promising results in applications with ultra-high temperatures, but they have shown some restrictions regarding their usage in certain temperatures—working best at about 1400 ◦ C to 1600 ◦ C—which has spurred the search for an alternative
We propose the creation of a microstructure coating that will advance plasma spraying technology in Ceramic matrix composites (CMCs) applications and protect against high temperature oxidation
Summary
Because of their many uses, ultra-high-temperature ceramics (UHTCs) are considered highly significant, for example, for use in spacecraft applications and wall defense shields in nuclear reactors [1,2]. Ceramic materials with high chemical, mechanical, and thermal strength can be used at extremely high temperatures. In these applications, high temperatures and a highly reactive and flowing atmosphere (e.g., O, O2 ) are used for the materials. The potential candidates for the material must be mechanically, chemically, and thermally stable. Some ceramic materials have shown good features that meet the needs of these applications in thermal protection systems, but these materials have fallen short. Ceramic matrix composites (CMCs) have shown promising properties for their application with high fracture resistance (over ceramic materials) and increased number of manufacturing techniques in these types of applications [5,6,7,8].
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