Ti, TiV, and TiZrAl Getters
For example, in thermally insulated pipes designed to supply hot fluid to a viscous oil reservoir, a Ti-Zr-Al getter is used. This getter has a low activation temperature, high sorption characteristics, and remains functional under dynamic and thermal cyclic loads for 5 to 10 years. The required quantity of getters for a device is determined by calculating the geometric parameters, gas content on the surfaces and in the material of the thermally insulated pipe, the sorption characteristics of the getter, and the system's lifespan.
Once getters are placed and fixed in vacuum devices, flasks, and thermally insulated pipes, the system is thoroughly vacuumed, and then the getter is activated by heating it to a certain temperature (activation temperature) while continuously vacuum pumping it. During the activation process, the gases sorbed on the getter surface are desorbed or chemisorbed into the gas absorber (getter), freeing up the adsorbent surface for the absorption of gases that enter the system after the pumping is stopped and the system is sealed.
Porous Ti and TiZrAl getters are shaped as dia.12x2.5 mm vacuum-sintered pellets.
For non-evaporable getter production POLEMA uses in-house made powders of such active materials as Ti, Ti-V and Ti-Zr-Al alloys with highly developed particle surface, excellent compressing and sintering characteristics.
Powders can also be used to make complex-shaped getters, for example, as sintered porous briquettes on a nickel band, or they are sputtered onto substrates as a porous layer of the required thickness.
TiZrAl getters used to equip thermally insulated pipes has an optimal combination of thermophysical, structural, and mechanical properties that ensure increased reliability of vacuum flasks in various climatic conditions throughout their entire service life.
You can contact our sales managers for more details at:
export_polema@metholding.com,
tel.: +7(4872)25-06-76.
TiZrAl Getter Structure
*Picture 1: TiZrAl getter sample surface topography.
*Picture 2: Distribution of Ti and Al in TiZrAl structure.
*Picture 3: Distribution of Ti and Zr in TiZrAl structure.
TiZrAl Sorption Characteristics
The recommended activation temperature is 350-400°C.
The specific maximum hydrogen sorption capacity (aspec ) at T=(200±20) °C and Pd=10-3 Pa:
aspec = (7.1±0.19) m3*Pa/g
Sorption rate for hydrogen (qsorp ) at Т=(200±20) °С: qsorp = 6,6 l/(sec*g)
Topographic studies and measurements of TiZrAl sorption characteristics by means of vacuum thermogravimetric analysis were carried out by the Research Institute of Microelectronics and Information and Measuring Equipment of the Moscow State Institute of Electronics and Mathematics named after A.N. Tikhonov.
Powders can also be used to make complex-shaped getters, for example, as sintered porous briquettes on a nickel band, or they are sputtered onto substrates as a porous layer of the required thickness.