Ceramic Thermal Barrier Coating Materials

Institut für werkstoffe und verfahren der energietechnik forschungszentrum jülich gmbh d 52425 jülich germany.

Ceramic thermal barrier coating materials.

Although the common ysz ceramic materials can meet the thermophysical properties and phase stability requirements of the thermal barrier coating at around 1000 c ysz is unable to meet the needs. We are also experts in plasma spray processing and the production of high performance surface coatings and finishes. Search for more papers by this author. Thermal barrier coating tbc is a coating made of ceramic materials deposited on the surface of a high temperature resistant metal or superalloy.

Silica at the grain boundaries leads to changes in the size and shape of grains and it may dissolve y 2 o 3 from the ysz grain boundary regions. With increasing engine efficiency they can reduce metal. 2 ceramic thermal barrier coating materials. Author links open overlay panel w.

Zirconates with high melting points were investigated for application as materials for thermal barrier coatings at operating temperatures 1300 c. The silica impurity even as low as 1 wt in ysz coating has a strong detrimental effect on the thermal cycling life 44 45 in bulk zirconia based ceramics silica segregates to grain boundaries with excessive amounts collecting at triple points. We are specialists in heat management. The coating insulates the substrate material and lowers the substrate temperature.

For a given strain δε which is determined by the thermal expansion mismatch between coating and substrate and the relaxation at high temperatures the energy release rate is proportional to the d coat and inversely proportional to elastic modulus of the coating e coat and an additional factor n which is a function of the poisson s ratio ν. Some ceramic materials possessing low thermal conductivities have been used as thermal barrier coating tbc materials to increase turbine inlet temperatures since the 1960s.