A device for loading gas and gas mixtures into precious metal
sample capsules for use in high-pressure high-temperature instrumentation
is now commercially available.
The original design of this device was conceived by Boettcher
et. al (American Mineralogist, Volume 74, page 1383-1384, 1989)
for their studies of the solubility of various gases (Ar, Xe,
Kr, N2, C02), in silicate melts. The device uses a standard laboratory
vacuum line to evacuate air from the capsule and solid sample,
thereby purging airborne contaminates from the system. Through
regulation of the gas flow, precise quantities of pure gas or
of gas mixtures are loaded into the sample capsule. Traditionally,
many gas substances were loaded as liquids or as solid compounds
that volatilized or decayed at temperature to release the desired
gas phase. Such methods were labor intensive, often inaccurate,
and commonly introduced unwanted elements and ubiquitous water
to the system. This device allows gas phases to be easily utilized
in high-pressure, high-temperature experimentation.
Accommodates 2mm, 3mm, 5mm, and 7mm OD sample capsules. Devices
for custom capsule sizes made by special order.
Accurately loads gas pressure up to 80 bars for 0.127mm (0.005in)
capsule wall thickness and up to 100 bars for 0.2mm (0.008in)
capsule wall thickness.
Includes gas-loading device with air and vacuum valve and
vise with crimping and rubber bumper jaws.
User provides vacuum, gas cylinder with regulator, capsule
material, and welder.