Properties of multicomponent layers produced on high speed steel by combined nitriding and PACVD methods under glow discharge conditions

Abstract
A prospective line in the development of thermo-chemical treatments under glow discharge conditions is to work out new techniques of producing multicomponent layers such as e.g. combined plasma nitriding and PACVD technique with the use of organic compounds. These layers permit widening the application range of treated parts since they improve their useful properties. The paper specifies the conditions under which the composite layers of the nitrided + Ti(NCO) type can be produced on high speed steel using a gaseous atmosphere of the organic titanium compound Ti(OC₃H₇)₄ nitrogen and hydrogen and discusses the influence of the carbon and oxygen contents in the Ti(N_xC_yO_z layer on its properties such as hardness and wear resistance. The composite layers of the nitrided + Ti(NCO) type have a good resistance to frictional wear. The chemical composition of these layers can be controlled. This new processes can be performed during a sole technological operation in a conventional equipment designed for glow discharge assisted techniques.