THE MECHANISM CHARACTERIZATION AND THE PHYSIC OF DIAMOND-LIKE CARBON (DLC) COATING USING PLASMA ASSISTED CHEMICAL VAPOR DEPOSITION (PACVD) TECHNIQUES ON TOOL STEEL HSS SURFACE
Saifudin (a*), Viktor Malau (b), Bagiyo Condro Purnomo (a), Budi Waluyo (a)
(a) Automotive Engineering Department, Universitas Muhammadiyah Magelang, Magelang, Indonesia
(b) Jurusan Teknik Mesin dan Industri, Fakultas Teknik, Universitas Gadjah Mada Jl. Grafika No. 2, Yogyakarta 55281
*Corresponding author: saifudin[at]ummgl.ac.id
Abstract
HSS tool steel usually used on engineering aplication especially as cutters. This material has some weaknesses such as wear easily and corrosion, and that weaknesses can be reduce by giving certain coating on the surface. The purpose of this research is to know the effects of Diamond Like Carbon (DLC) coating and also quenching heating treatment and tempering to the characterization of physical and mechanism of the HSS steel surface. The physical characterization which will be elaborate is the micro structur, whether the mechanism characters which will be know are hardness and wear rate. HSS steel has chemical compotition variation (% mass) : 0,75-1,5 C; Co >12; V > 5; 4-4,5 Cr; 10-20 W and Mo. DLC coating uses Plasma Assisted Chemical Vapor Deposition (PACVD) techniques with coating duration variation (1,2,3,4,5 and 6 hours) on 300 temperature with pressure variation 1,0; 1,2; 1,4; 1,6; 1,8 and 2,0 mbar. DLC coating material get from methane gas or ethane which is streamed into fire with Argon (Ar). The surface hardness can be know using Vickers micro hardness tool, wear rate can be know using wear tool while the micro structure using optic microscop. The result of this research showed the variation of DLC coating hardness grade depends on coating time process and pressure variation. DLC coating with 4 hours coating process and 1,8 mbar pressure can reduce the surface hardness of HSS tool steel for 62% accompanied by ductile increasing.
Keywords: Tool steel; hardness; wear rate
Topic: Mechanical Engineering