Sir, Perhaps my paper (Reiber 1994) is not easy to understand, but all five "flaws" suggested by Prof. Ohman are misunderstandings. There are some demanding mathematical and physical-chemical differential equations involved, which are not easy for the reader untrained in biophysics to understand. I will present a background discussion and then comment on the "flaws". There is disagreement about...

Abstract Loss of mechanical integrity due to thermal aging and subsequent spallation the ceramic top layer is one dominant failure mechanisms in barrier coating systems. In order predict avoid such failure, a strain-based lifetime assessment model presented for novel double-layer system. The investigated system consists gadolinium zirconate on yttria-stabilized zirconia prepared by atmospheric ...

The objective of this study was to mimic the microstructure of MCrAlY coatings sprayed using HVOF (High Velocity Oxy-Fuel) processes by using an Air Plasma Spray (APS) process in order to improve oxidation and spallation life of MCrAlY APS coatings. Figure 1 shows the typical microstructures obtained when spraying bond coats using the (a) HVOF process, and (b) the APS process. The microstructur...

Gadolinium zirconate (GZ) is an attractive material for thermal barrier coatings (TBCs). However, a single layer GZ coating has poor cycling life compared to Yttria Stabilized Zirconia (YSZ). In this study, Solution Precursor High Velocity Oxy-Fuel (SP-HVOF) spray was used produce double GZ/YSZ TBC and the performance with YSZ TBC. The temperature behaviour of solution precursor studied, splat ...

Thermal barrier coating (TBC) systems are coating systems containing a metallic bond coat and a ceramic top coat. TBCs are used in gas turbines for thermal insulation and oxidation resistance. Life prediction of TBCs is important as high-temperature exposure degrades the coatings through mechanisms such as thermal fatigue and the formation and growth of thermally grown oxides (TGOs). This thesi...