公开(公告)号：US11085097B2

公开(公告)日：2021-08-10

申请号：US16327884

申请日：2017-08-31

Applicant: Xi'an University of Technology

Inventor： Yang Xu ,  Guojun Yan ,  Baojian Liu

IPC: C21D9/40 ,  C21D1/32 ,  C22C37/06 ,  C22C37/10 ,  C22C37/08 ,  F16C33/66 ,  B22D11/14 ,  C21D1/20 ,  C22C33/08 ,  C22C37/04

Abstract: A self-lubricating rolling bearing is provided. The chemical compositions in the inner rings and the outer rings of bearing are 3.4-3.7% C, 2.7-2.9% Si, 0.3-0.5% Mn, 0.3-0.5% Cr, ≤0.05% S, ≤0.05% P, 0.03-0.045% Residual Mg, and the remainder Fe. The total percent of the chemical compositions is 100%. The material for the inner and outer rings of the rolling bearing introduced in the invention is austempered ductile iron (ADI). In the microstructure of ADI, the diameter of the graphite nodules is less than 0.02 mm, the number of graphite spheres per square millimeter is more than 400, and the microstructure of the metal matrix in the ADI can be showed clearly only when it is observed on the microscope with a magnification more than 500. Eventually, the self-lubricating rolling bearings are made from the ADI.