Diffusion welding of heaters made of molybdenum disilicide

Conclusions

It has been established that with diffusion welding in a vacuum and under optimal conditions, a physical interface is completely absent between the welded materials, i.e., the structure of the welding zone does not differ from the structure of the starting molybdenum disilicide. The porosity is 2.1%. The size of the pores varies from 2 to 70μ, and the zone of the welded bond of molybdenum disilicide is equal in strength to the base material.

Tests under industrial conditions showed that the molybdenum disilicide heater, welded by diffusion welding in a vacuum, worked on a par with those imported, and lasted 3000 h at a temperature of 1650–1700°C.

As a result of developing and introducing the new technology of producing molybdenum disilicide heating rods, the Moscow Hard Alloys Combine has obtained a great economic saving, of the order of 350,000 rubles in 1961–1962.