GB/T 42539-2023 Active National standards

GB/T 42539-2023 Rolling bearings—Ceramic bearings balls—Determination of the strength by notched ball test

Publish Date: 2023-05-23 Implement Date: 2023-12-01 For services related to genuine standard inquiry, procurement, translation, and other related services in China, please Contact Us

Basic Information

Standard Code: GB/T 42539-2023

Standard Type: National standards

Standard Status: Active

is_force_gb: no

CCS Name: Rolling bearings

ICS Name: Rolling bearings

Publish Date: 2023-05-23

Implement Date: 2023-12-01

Pages: 28 pages

Scope

This document specifies the method for determining the strength of finished ceramic balls for bearings with a diameter of 3 mm to 50 mm. Ceramic balls are preferably made of silicon nitride (Si3N4).
Note 1: The requirements for silicon nitride material of pretreated ceramic balls are given in ISO 26602. The requirements for finished silicon nitride ceramic balls are given in ISO 3290-2.
Note 2: Other methods for determining the strength of ceramic balls can be found in the references.
The Poisson's ratio has a slight impact on the results of the strength test. Therefore, when calculating, including the typical silicon nitride ceramics used as bearing rolling bodies, the Poisson's ratio of the materials used ranges from 0.15 to 0.35.
This test can also be used for ceramic balls made of other ceramic materials, but the pre-factors in this document may not be applicable.
Note 3: ISO 17561 gives a method for determining the Poisson's ratio of isotropic materials.
Due to the brittle fracture of ceramic materials (influenced by defects), the test results of a group of nominally identical samples may vary significantly.
Note 4: ISO 20501 gives further methods for statistical analysis.