Measuring and testing – Sampler – sample handling – etc. – With heating or cooling
Patent
1981-03-23
1983-06-28
Goldstein, Herbert
Measuring and testing
Sampler, sample handling, etc.
With heating or cooling
374 17, G01N 2504
Patent
active
043899048
ABSTRACT:
A method and apparatus for preparing and studying samples of materials supercooled and solidified in a containerless, low-gravity environment in bulk form is disclosed which includes an enclosure 10 in which a containerless environment is provided in which a sample specimen 52 is positioned. Method contemplates heating the specimen 52 in the containerless environment, dropping the specimen melt through the tube 12 wherein it cools by radiation, and alternately backfilling the tube 12 with an inert gas whereby the specimen melt cools by both radiation and convection during its free fall. During the free fall, the sample is in a containerless, low-gravity environment which will enhance supercooling in the sample and prevent sedimentation and thermal convection influences. The sample will continue to supercool until nucleation occurs which is detected by silicon photovoltaic detectors. The sample will solidify after nucleation and be completely solid before entering the detachable catcher. The amount of supercooling of the specimen can be measured by knowing the cooling ratio and determining the time for nucleation to occur.
REFERENCES:
patent: 2795819 (1957-06-01), Lezberg et al.
patent: 3173288 (1965-03-01), Davis et al.
patent: 3173289 (1965-03-01), Davis
patent: 3496760 (1970-02-01), Pozniak
patent: 3963812 (1976-06-01), Schlienger
patent: 4313745 (1982-02-01), Lovelace
Lacy et al., "Containerless Undercooling and Solidification in Drop Tubes" in Journal of Crystal Growth, vol. 5, 1981, pp. 47-60.
Katz Lester
Lacy Lewis L.
Nisen Daniel B.
Rathz Thomas J.
Robinson Michael B.
Beumer J. H.
Goldstein Herbert
Manning J. R.
The United States of America as represented by the Administrator
Wofford, Jr. L. D.
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