The materials and their application technologies were developed to protect the structures from high-temperature environmental effects.
The thin-layer TPC for protection of launch vehicle external surfaces based on water polyurethane dispersions, micro spheres, fire retarders and other additives. The basic methods of applying liquid mixtures of external thermal-protective coating on articles to be protected is pneumatic spraying.
Characteristics of External Thermal-Protective Coating
|
Density, g/cm3 |
0.4-0.55 |
|
Working thickness of coating, mm |
0.5-18.0 |
|
Breaking tensile strength, MPa |
2.0 |
|
Heat conductivity factor, W /(m´К) |
0.1 |
|
Specific heat capacity, kJ (kg´К) |
1.6 |
|
Initial breaking temperature, °С |
230 |
|
Maximal breaking (ablation) temperature, °С |
600 |
The ceramic-metal thermal-protective coating is intended to protect the liquid rocket engine turbine blading section and is a mixture based on glass, metal and silicon. It is highly resistant to practically all aggressive media. It is characterized by high strength, wearability, hardness, low density and stability of mechanical properties in wide temperature range. It is applied on the surface to be protected in the form of slurry mass with subsequent heat treatment.
Operating Conditions of Ceramic-Metal Coating
|
Excessive content of oxygen in high-temperature generator gas, % (by mass) |
98-99 |
|
Gas temperature, °С |
85 to 600 |
|
Gas pressure, kgf/cm2 |
100¸500 |
|
Gas velocity, m/s |
50¸515 |
|
Permissible operating temperature, °С |
-155 to +900 |
The internal thermal-protective coating was developed on the basis of calendered rubber mixtures and is intended to protect engine case from thermal effects during solid propellant products combustion. It is manufactured by method of layer-by-layer facing with subsequent polymerization in article.
Characteristics of Internal Thermal-Protective Coating
|
Density, not more, g/cm3 |
1.06 |
|
Heat conductivity factor, not more (W/kg´К) |
0.244 |
|
Specific heat capacity, not less, J /(kg´К) |
0.35 |
back to the catalog
