Electricity: measuring and testing – Determining nonelectric properties by measuring electric...
Patent
1985-05-06
1986-07-15
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Determining nonelectric properties by measuring electric...
164 41, 266 99, 377 12, G01N 2702
Patent
active
046008802
ABSTRACT:
The invention provides a new method and apparatus for the detection of non-conductive particulates in molten metals, such as aluminum, gallium, zinc and lead, that can be liquified and drawn into a suitable refractory container. The passage into the container is of very small diameter (about 300 micrometers for aluminum) and it forms part of a current path between two electrodes carrying a current of about 1 to 500 amperes. The path is surrounded by liquid metal which forms an effective Faraday cage screening the path, enabling the passage of a particulate of about 15 micrometers or larger to produce a voltage pulse between the electrodes of greater than 5 microvolts, which is detectable above the inevitable background noise, which is of about that value. The size of the pulse gives an indication of the particle size and appropriate measurement and sampling electronically of the pulses gives a rapid evaluation (less than 3 minutes) of the particle size distribution, giving the operator an opportunity of deciding immediately whether or not further cleansing of the metal is required.
REFERENCES:
patent: 3259842 (1966-07-01), Coulter et al.
patent: 3921006 (1975-11-01), Pontigny
patent: 3963984 (1976-06-01), Coulter
patent: 4413810 (1983-11-01), Tenberg et al.
van der Plaats et al, "Size Determination of Conductive Particles with a Coulter Counter", Particle Size Analysis 1981, Loughborough Univ. of Technology, Sep. 21-24, 1981, published 1982, pp. 209-215.
Simensen et al, "Analysis of Intermetallic Particles in Aluminum by Dissolution of the Sample in Butanol", Fresenius Zeichnung fur Anal. Chem., 1984, pp. 286-292.
Simensen, C. J., "Sedimentation Analysis of Inclusions in Aluminum and Magnesium", Metallurgical Transactions B, vol. 12B, Dec. 1981.
Simensen et al, "Analysis of Inclusions in Aluminum by Dissolution of the Samples in Hydrochloric/Nitric Acid", Fresenius Zeichnung fur Anal. Chem. 308, 1981, pp. 11-16.
Particle Data, Inc., advertising flyer for ELZONE 112, Oct. 1982, pp. 1-4.
Doutre Don A.
Guthrie Roderick I. L.
Eisenzopf Reinhard J.
Limca Research Inc.
O'Shea Kevin D.
LandOfFree
Apparatus for the detection and measurement of particulates in m does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Apparatus for the detection and measurement of particulates in m, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus for the detection and measurement of particulates in m will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1742787