Getters are widely used as pumps in high-vacuum systems and tubes, and for the purification of gases. They are classified in two categories:
Non-evaporable getters are primarily used for incandescent lamps, high-pressure discharge lamps, metal halide lamps and other industrial applications. These getters are also used to maintain the necessary vacuum in metal vacuum applications.
As of their high reactivity, metal powders such as zirconium and titanium, when heated are able to directly absorb gaseous impurities present within evacuated or inert-gas volumes, without requiring evaporation.
Evaporable getters are used in order to create and maintain a high vacuum in cathode ray tubes (CRTs) for television sets and computer monitors. Other current applications of evaporable getters include low pressure discharge lamps and fluorescent displays.
Our barium is particularly well suited as evaporable getter material because it has a low vapor pressure at the working temperatures of the CRTs, low-pressure discharge lamps, and fluorescent displays, and is very reactive towards undesired gases, such as oxygen, nitrogen, hydrogen, carbon dioxide, water vapor, even removing residues of inert gases by inclusion.
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