GCr15 bearing steel ball surface intensified ion injection technology

Abstract

Disclosed is an ion implantation process for reinforcing bearing steel ball surface of GCr15 by using nitrogen and titanium as implantation elements which are implanted by employing a linear-beam high-current double-element ion implanter. The invention employs monoenergetic mode with implantation energy of 100KeV (kilo electron volt). Titanium is implanted and then nitrogen is implanted, implantation dose is controlled within 2.0 to 3.0*10 17 Ti+2.0 to 3.0 *10 17 N, linear ion beams are implanted in a steel ball with a curved surface, steel balls with different diameters produce different refraction effects, thereby the implantation dose needs to be adjusted within the implantation dose range according to the real sizes and properties of the steel balls, ensuring the concentration of nitrogen ion implanted on the surface of the steel ball over 18%, the concentration of titanium ion over 10% and uniformity over 85%. The employment of the implantation process is capable of guaranteeing the depth, concentration and uniformity of ion implantation of the surface of the steel ball, and thereby the steel ball surface has the advantages of relatively high hardness, relatively good corrosion resistance and abrasion resistant properties, relatively long endurance life and relatively high reliability.

Description

technical field [0001] The invention belongs to the technical field of heat treatment, and in particular relates to an ion implantation process for strengthening the surface of GCr15 bearing steel balls. Background technique [0002] Steel balls are key components of bearings, and their quality directly affects the service life and reliability of bearings. According to relevant data, in the bearing fatigue failure, due to the steel ball fatigue accounted for more than 20%, so improving the fatigue life of the steel ball is very important to improve the life and reliability of the bearing. [0003] The failure analysis of rolling bearings shows that the failure of the bearing mainly occurs on its working surface and sub-surface layer. As far as high-precision bearings are concerned, the failure form is mainly surface damage, including micro-pitting, corrosion, wear, and surface fatigue. damage and plastic deformation. Applying modern surface analysis technology to study the...

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Problems solved by technology

Domestic research on ion implantation of bearing steel is mostly limited to the implantation process of the sample surface, and the surface ion implantation process of GCr15 bearing steel balls with large surface curvature and special shape has not been reported yet.