Abstract A method of coating an electrical conductor with an insulating material comprising the steps of dispersing a finely ground micronitic mineral powder such as magnesium-aluminum silicate or potassium-aluminum silicate in a solution of a binder agent the concentration of which is adjusted so that each particle of the powder will be ultimately coated with only a thin skin of the binder agent, drying the dispersion so as to evaporate the solvent and establish a meallike powder in which the individual binder coated particles do not adhere to each other, and then applying the dried binder-coated particles to the electrical conductor. An after-heat treatment of the coated electrical conductor is utilized to cement the particles together and in the case of a hardenable binder, such as an epoxy resin, to harden it. Drying of the dispersion can be effected by the spray drying technique in which all of the solvent is evaporated prior to particle impingement, or by using a rotating drum. Application of the dried binder-coated particles can be effected by an electrophoresis bath technique, or by the suspension method, or by electrostatic spraying.
Inventors
👤 Walter Meier
👤 Franz Knapp
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-11-03 16:21
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/002; H01B3/006
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
136 words
The method as claimed in claim 1 and which includes the further steps of preparing the metallic conductor by pickling and rinsing, placing said prepared metallic conductor into a grounded electrophoresis bath which is kept in motion to prevent sedimentation and which consists of a conglomerate-free suspension of the binder coated mineral particles with a dispersion medium in which the binder coating does not dissolve, swell or coagulate, passing an electrical current through the bath and electrical conductor to cause the binder coated mineral particles to be deposited on the electrical conductor to the desired thickness, removing the coated electrical conductor from the bath and rinsing, and then subjecting the coated electrical conductor to a heating treatment to cement the binder coated particles together, and in the case of a hardenable binder to harden the same.
Claim 2
Dependent Claim
132 words
The method as defined in claim 2 wherein said pickling step for said electrical conductor is carried out in concentrated nitric acid and which includes the steps of rinsing out the nitric acid with water, immersing the rinsed electrical conductor in a 1 percent tartaric solution, and finally rinsing with fully desalted water, wherein said electrophoresis bath consists of a dispersion of 2,000 grams of the binder coated mineral particles in 20 liters of fully desalted water, has a pH value of about 7.0 and a conductivity of about 600 Mu S and is maintained at at temperature of about 30* C., wherein a current density of at most 0.1 ampere/cm.2 is maintained in the bath, and wherein the after heating treatment is carried out at a temperature of about 150* C.