The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 19, 1991
Filed:
Feb. 26, 1991
John H Perepezko, Madison, WI (US);
Mark K Hoffmeyer, Madison, WI (US);
Wisconsin Alumni Research Foundation, Madison, WI (US);
Abstract
The Droplet Emulsion Technique is used to produce droplets of bulk metal or metal alloys containing inoculant particles. Heterogeneous nucleation responses are then separated and identified with variances in inoculant chemistry, size, morphology, and surface conditions in the different droplets. Differential Thermal Analysis (DTA) is used to detect and to correlate thermal signals generated from as little as 50 droplets 75-100 .mu.m in size, allowing the separation of signals generated by a minor fraction of the total droplet population. Quenching treatments are used on the samples during thermal analysis to retain the original solidification microstructures produced from effective inoculation. Differences between droplet solidification microstructures preserved from the quenching treatments allow for visual identification of effective and ineffective inoculant particles. The factors controlling effective inoculation of solid include the chemistry, morphology, crystal structure, and surface conditions of inoculant particles which are identified by using analytical x-ray and electron microbeam techniques.