An investigation into the removal of oxide films from molten A20X with the use of rotary impellor degassing

Greenwood, Thomas (2015). An investigation into the removal of oxide films from molten A20X with the use of rotary impellor degassing. University of Birmingham. M.Res.

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Abstract

This thesis investigates the effect of rotary degassing on the level of oxide film inclusions within an A20X melt and in turn their effect of the flow of A20X through ceramic foam filters. Oxide films have been shown to restrict metal flow through filters placed in running systems of castings causing incomplete and unpredictable filling of the mould cavity.

It was found that increasing the rotor speed and decreasing the gas flow rate of argon through the rotating impellor resulted in removal of oxide films from the melt. This is thought to be a result of the smaller bubble sizes and greater distribution of bubbles through the melt created by the increased rotation speed of the impellor.

It was also found that the use of argon purge gas did not remove significant amounts or grain refining TiB\(_2\) particles from the A20X melt.

Type of Work:

Thesis (Masters by Research > M.Res.)

Award Type:

Masters by Research > M.Res.

Supervisor(s):