A start-up company is designing the external tiles for a reusable orbital launch vehicle
CHEMISTRY · Multi-part · AP · Chemistry · Properties of Substances and Mixtures · Properties of Substances and Mixtures
Problem
A start-up company is designing the external tiles for a reusable orbital launch vehicle. During atmospheric re-entry the tile surface briefly reaches 1600 °C, but the aluminum alloy frame behind the tile must remain below 350 °C to maintain structural integrity. Each tile must also withstand rapid temperature cycling, low Earth-orbit micrometeoroid impacts, and occasional exposure to hydrazine-based rocket fuel. The engineering team has narrowed their options to three commercial solids: • Type Z ultra-low-density silica aerogel (molecular solid reinforced by SiO2 network) • Hot-pressed silicon carbide, SiC (covalent network solid) • Monel K-500 nickel-copper alloy (metallic solid) Additional information is provided:| Property | Silica Aerogel | SiC | Monel K-500 |
|---|---|---|---|
| Melting point (°C) | 1200 (softens) | >2700 | 1300 |
| Thermal conductivity at 25 °C (W·m⁻¹·K⁻¹) | 0.017 | 120 | 22 |
| Compressive strength (MPa) | 1.2 | 390 | 965 |
| Surface hardness (Mohs) | 2 | 9.5 | 3.5 |
| Chemical reactivity with hydrazine | None observed | None observed | Rapid corrosion |
| Cost (USD · m⁻² @ 1 cm thick) | 310 | 540 | 220 |