VAPOR-DEPOSITED COATING FOR ELECTRICAL CONTACTS

SHEHDEH JODEHDEPARTMENT OF CHEMISTRY

AN-NAJAH NATIONAL UNIVERSITYNABLUS- PALESTINE

OBJECTIVESTO EXPLORE NEW COATING STRUCTURES AND COMPOSITION CREATED BY PVD FOR LOW FRICTION, GOOD WEAR RESISTANCE, LOW CONTACT RESISTANCE AND HIGH TEMPERATURE ELECTRICAL CONTACT APPLICATION

INTRODUCTIONTODAY, THERE ARE ABOUT 1500 ELECTRICAL TERMINALS IN EACH AUTOMOBILE.

TO ENSURE RELIABLE ELECTRICAL CONTACTS, VARIOUS COATINGS ARE APPLIED TO THE CONNECTORS

MOST CONNECTORS USED IN AUTOMOBILES THESE DAYS ARE ELECTROPLATED WITH TIN(Sn).

AS THE UNDER HOOD SPACE BECOMES MORE COMPACT AND AN INCREASING NUMBER OF SENSORS ARE MOUNTED CLOSE TO THE ENGINE, THE COATINGS ARE REQUIERED TO FUNCTION AT 150 °C TO 200 °C IN THE UNDERHOOD ENVIRONMENT.

BASIC IDEASFRICTION COEFFICIENT,μ, ACCORDING TO THE THEORIES FOR ADHESION FORCE AND THAT FOR JUNCTION GROWTH, IS GIVEN BY:

µ = τ/P0

Τ= SHEAR STRENGTH,, P0= NORMAL STRENGTH

EXPERIMENTALEVAPORATION MATERIALS ARE 99.999% PURE AG AND 99.99% NI.

SAMPLE CLEANED BY ACETONE, METHANOL, AND SPUTTERED WITH 100 Ev Ar+ with a beam current density of 1 mA/cm2.

EPMA, AES, SEM, and XRD.