Carbon-based composite materials (C/C

C/SiC) have high specific strength

high specific modulus

low density

low thermal expansion coefficient

corrosion resistance

thermal shock resistance

and are considered as one of the most promising high temperature structural materials. However

carbon-based composites generally begin to oxidize at 500 ℃

and have large porosity

which cannot achieve high pressure sealing

which greatly limits the application prospects ofcarbon-based composites. Under the environment of high temperature and high pressure air scour

ultra high temperature ceramic base protective coating can effectively inhibit carbon composite material (C/C

C/SiC) in the degradation of carbon composition. The melting point of hafnium carbide (HfC) is as high as 3890 ℃

which is the highest in the known single compound

the thermal conductivity is only 5.6 W/(m · K)

Vickers hardness is as high as 26 GPa

good ablative resistance

but also has low thermal conductivity

low oxygen diffusion coefficient

low surface vapor pressure. Oxidation resistant ablative coatings have been used as extremely heat resistant components such as rocket nozzles and nose cones. In this paper

the research background

basic properties

preparation technology

ablation mechanism and coefficient of thermal expansion are summarized. The current challenges of ultra temperature ceramic HfC coatings are pointed out

and the development trend of ultra temperature ceramic HfC coatings is forecasted.