High-velocity oxy-fuel spraying of ceramics

High-velocity oxy-fuel spraying can be used for the manufacture of oxide-ceramic coatings which offer advantages over the utilisation of alternative spraying procedures in relation to the porosity, the tendency to microcracking and the oxygen loss. Technically mature equipment for flexible spraying of either fine powder or suspension feedstock has been developed. In order to be able to exploit the full potential of HVOF suspension spraying, it is still necessary to optimise suspensions in relation to their properties including their stability and reproducibility and to develop and establish procedures for the suitable characterisation of these properties.