A large proportion of IC blades and vanes require to have the complex silica ceramic cores removed post casting. The principle method used is autoclave leaching.

This paper will present an explanation of the process and will describe the stages of the process using experimental data taken from a development unit at LBBC Technologies. This unit is used for process development and customer trials.

In particular, the paper will provide descriptions of

• the importance of safety
• the use and re-use of NaOH or KOH
• impact of varying the key parameters of temperature and pressure
• process control and optimisation

It will also explain how the equipment operates and is used by the IC industry.

LBBC Technologies have supplied over 50 core leaching autoclave systems over the last 25 years and have worked with the leading engine manufacturers throughout the world. Their systems are recognised as the preferred choice of equipment for the removal of complex silica based ceramic cores.

Howard Pickard is the Managing Director of LBBC Technologies. He has been with the company over 20 years and is the fifth generation of his family to hold this position.