ISO 4821:2022 PDF

Plain bearings — Dynamic adhesion test method for DLC coated parts under lubricated condition

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Title (English):

ISO 4821:2022

Plain bearings — Dynamic adhesion test method for DLC coated parts under lubricated condition

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 13
Publication date:: May 18, 2022
Edition:: ISO IS 4821 edition 1 version 1
ICS:: 21.100.10

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Description (English):

This document specifies a procedure to measure the adhesion strength of diamond-like carbon (DLC) coatings specified in ISO 20523 by detecting acoustic emission signals using ball-on-disk method under the lubricated condition. DLC is normally coated on metal or ceramic. The test results are not applicable when the DLC coated parts operate in an unlubricated environment.

Technical details

Technical committee: ISO/TC 123/SC 7 - Special types of plain bearings
SKU: ISO 4821:2022

Abstract

Overview

ISO 4821:2022 - Plain bearings - Dynamic adhesion test method for DLC coated parts under lubricated condition - specifies a laboratory procedure to evaluate adhesion strength of diamond-like carbon (DLC) coatings) by detecting acoustic emission (AE) during a ball-on-disk test under lubricated conditions. The method targets DLC films (typically applied to metal or ceramic substrates) and is intended for quality control and comparative evaluation; results are not applicable for unlubricated service environments.

Key topics and technical requirements

Test principle: Ball-on-disk sliding contact with AE monitoring to detect DLC delamination (sharp AE signal increases).
Specimens:
- Ball: diameter 9.525 mm, material 100Cr6 (per ISO 683-17), recommended grade equivalent to G28 or better, hardness HRC 62–67.
- Disk: thickness ≥ 2.5 mm, DLC film thickness 0.1 μm to 10 μm, test diameter ≥ 28 mm, flatness and parallelism within 0.02 mm (ISO 1101), surface roughness

Related standards

Mentioned in the description and other ISO standards

Overview

Key topics and technical requirements

Test principle: Ball-on-disk sliding contact with AE monitoring to detect DLC delamination (sharp AE signal increases).
Specimens:
- Ball: diameter 9.525 mm, material 100Cr6 (per ISO 683-17), recommended grade equivalent to G28 or better, hardness HRC 62–67.
- Disk: thickness ≥ 2.5 mm, DLC film thickness 0.1 μm to 10 μm, test diameter ≥ 28 mm, flatness and parallelism within 0.02 mm (ISO 1101), surface roughness

ISO 4821:2022 PDF

Technical details

Abstract

Overview

Key topics and technical requirements

Related standards

Abstract

Overview

Key topics and technical requirements

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