Materials for steam gasification of coal with HTR heat

After a survey of the technical realization of steam gasification with nuclear heat, materials testing and development of suited materials are carried out for heat transfer from the core of the nuclear reactor and design of a gas generator. In a fluidized bed of steam gasification equipment, known heat resisting alloys have shown different oxidation mechanisms. Silicon and carbon favour the oxidation of grain boundaries. In alloys with Co, W, Mo, Al and Ti internal oxidation partly combined with oxidation of the grain boundaries takes place. During the testing period of 1,000 hours there is no indication of carburization, sulphidation and attack by hydrogen or ash in all tested alloys. Erosion seems to be negligible. It should be possible to develop alloys with sufficient heat resisting and creep rupture strength