Thermal properties and performance of carbon fiber‐based ultra‐high temperature ceramic matrix composites (C_f‐UHTCMCs)

Abstract

The thermophysical properties of carbon fiber‐based ultra‐high temperature ceramic matrix composites have been determined to aid designers who need these properties when considering using the composites in ultra‐high temperature aerospace applications. The coefficient of thermal expansion (CTE) and thermal diffusivity of the composites were measured parallel and perpendicular to the ply direction; the thermal conductivity was measured using the laser‐flash method and the heat capacity calculated from the relationship between the thermal diffusivity, density, and thermal conductivity. Both the CTE and thermal conductivity showed higher values across the ply and increased with increasing temperature as expected, whilst the thermal diffusivity showed higher values parallel to the ply and increased smoothly with temperature. In addition, two different but related oxyfuel torch tests, based on oxyacetylene and oxypropane, were used to evaluate the thermo‐ablation behavior of the composites. The tests showed how good the composites were at withstanding the ultra‐high temperatures, high heat fluxes, and gas velocities involved.

Advances in ultra-high temperature ceramics, composites, and coatings

“…A better solution to toughen the UHTCs is to introduce continuous fibers into their matrix. Continuous fiber-reinforced UHTC matrix composites (UHTCMCs) overcome the inherent brittleness and poor thermal shock resistance of bulk UHTCs [20][21][22][23]. Compared to the traditional aerospace composites of C or SiC matrices, the UHTCMCs seek to provide higherwww.springer.com/journal/40145 temperature capability and enhanced ablation resistant performance.…”

Microstructural regulation, oxidation resistance, and mechanical properties of Cf/SiC/SiHfBOC composites prepared by chemical vapor infiltration with precursor infiltration pyrolysis

“…Continuous carbon fiber (or carbon fiber perform) reinforced ceramic matrix composites have the excellent properties, such as low density [15], high toughness [16], high strength, and high reusability [17], especially the toughening property [18], which help to solve the inherent brittleness of ceramic materials [19]. It not only improves the thermal shock resistance of ceramic materials, but also maintains the inherent high-temperature stability and low thermal expansion coefficient of ceramic materials [8].…”

“…However, due to the low reaction activity of carbon fiber and the damage of carbon fiber in a high-temperature oxidation environment, the interface bonding performance between continuous fiber-reinforced phase and the ceramic matrix will be reduced, and the excellent characteristics of continuous carbon fiber cannot be brought into full play. The coating will reduce the area of carbon fiber exposed to oxygen atmosphere, thus improving the oxidation resistance of the composites Therefore, chemical vapor deposition (CVD), chemical vapor infiltration (CVI), and hydrothermal methods can be used to prepare coatings on carbon fiber surface [1,17,20]. The types of coatings include C coating [21], BN coating [22], SiC coating [23,38], etc.…”

Microstructural Regulation, Oxidation Resistance and Mechanical Properties of Cf/SiC/SiHfBOC Composites Prepared By Chemical Vapor Infiltration With Precursor Infiltration Pyrolysis

“…At present, a variety of precursor ceramics have been synthesized, such as SiBOC [11]、SiZrOC [12]、SiHfOC [12]、 SiAlOC [13]、SiBCN [14]、SiHfBOC [3]、SiBCNZr [14], etc. Continuous carbon fiber (or carbon fiber perform) reinforced ceramic matrix composites have excellent properties, such as low density [15], high toughness [16], high strength, and high reusability [17], especially the toughening property [18], which helps to solve the inherent brittleness of ceramic materials [19]. It not only improves the thermal shock resistance of ceramic materials but also maintains the inherent high-temperature stability and low thermal expansion coefficient of ceramic materials [8].…”

“…However, due to the low reaction activity of carbon fiber and the damage of carbon fiber in a hightemperature oxidation environment, the interface bonding performance between continuous fiberreinforced phase and the ceramic matrix will be reduced, and the excellent characteristics of continuous carbon fiber cannot be brought into full play. The coating will reduce the area of carbon fiber exposed to oxygen atmosphere, thus improving the oxidation resistance of the composites Therefore, Chemical vapor deposition (CVD), chemical vapor infiltration (CVI), and hydrothermal methods can be used to prepare coatings on carbon fiber surface [1,17,20]. The types of coatings can include C coating [21], BN coating [22], SiC coating [23], etc.…”