Heat treatment of electromagnetic shielding composition
AssigneeChomerics, Inc.
InventorWen-Shian V. Tzeng
Life of this patent
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Abstract
Aluminum silicon alloys are used as cores for highly conductive metal coated particles to be incorporated in resins for use as electromagnetic interference shielding. High temperature processing conditions are used after coating of the particles to improve internal and external corrosion resistance of gaskets and filled resins into which the particles are incorporated for shielding use.
Claims16
A method of forming electrically conductive particles for use as a conductive filler in a resin matrix for electromagnetic shielding use said method comprising,
- heating an aluminum-silicon-alloy core silver plated particle for from about 2 to about 8 hours at a temperature range from about 150.degree. C. to about 300.degree. C.
A method of treating particles to improve corrosion resistance properties of said particles both internally and externally when they are mixed with a resin matrix to form a shielding material,
- said particles being aluminum core particles having a layer of an electrically conductive material,
- said method comprising treating said particles at a temperature of from about 300.degree. C. to about 600.degree. C. for a time period at least sufficient to reach a temperature within the desired range to enhance corrosion resistant properties of said particles.
A method of treating aluminum silicon core particles having an outer layer of electrically conductive metals to improve corrosion resistant properties of said particle both internally and externally, when they are mixed with a resin matrix to form an EMI shielding material,
- said method comprising heating said particles to cause phase transformation of the aluminum silicon core causing spheriodization of originally dendritic precipitates in the core.
Dependencies are inferred from the claim text.