Hardening of surface of medical instrument by laser pulse optical discharge using methods of mathematical experimental planning

Abstract

The purpose of this work is to study the effect of a nanosecond laser pulsed optical discharge on the properties of the surface of medical instrument steel. As a result of the work done, a scheme was developed for hardening materials and alloys, based on the local thermal effect of the shock wave of a laser pulsed discharge, which is distributed at supersonic speed in the atmosphere. The impact of a pulsed laser with a frequency of 5 to 20 Hz, with a duration of 10 ns, with a single pulse energy of 150 to 300 mJ was carried out on the surface of a metal scalpel. Using mathematical planning methods based on a full factorial experiment, it was obtained that the maximum hardness (600 HV) of the surface of a medical instrument is achieved in the mode E = 0,225 mJ and F = 5 Hz.