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1. (WO2017155584) PHOSPHORESCENT FERRO-MAGNETIC PARTICLE FORMULATION AND METHOD OF NON-DESTRUCTIVE TESTING THEREWITH

Pub. No.:    WO/2017/155584    International Application No.:    PCT/US2016/067801
Publication Date: Fri Sep 15 01:59:59 CEST 2017 International Filing Date: Wed Dec 21 00:59:59 CET 2016
IPC: C09K 11/88
C09K 11/77
C09K 11/00
B82Y 30/00
C07D 251/60
C09D 133/08
C08L 77/00
C08F 20/06
C08F 18/04
C09C 3/10
C09K 11/02
G01N 27/82
Applicants: ILLINOIS TOOL WORKS INC.
Inventors: KILTY, Shawn Michael
Title: PHOSPHORESCENT FERRO-MAGNETIC PARTICLE FORMULATION AND METHOD OF NON-DESTRUCTIVE TESTING THEREWITH
Abstract:
A dispersion of particles is provided that each contain at least one ferromagnetic domain and at least one phosphor domain having a stimulation wavelength, a glow persistence of at least 5 seconds and a visible wavelength emission. A polymeric resin that is transmissive of the stimulation wavelength and the visible wavelength emission coats the ferromagnetic and phosphor domains to define each particle size. A method of non-destructively inspecting a test article applies a dispersion of these particles to a surface of the test article. A magnetic field is then induced including the test article. The surface of the test article is exposed to incident energy adapted to stimulate phosphorescence of the dispersion of particles. With the incident energy exposure ceased, the position of the dispersion of particles on the surface of the test article is imaged. An inspection system for non-destructively inspecting a test article is also provided.