ISO 4821:2022

Name: ISO 4821:2022 — Plain bearings — Dynamic adhesion test method for DLC coated parts under lubricated condition
SKU: ISO 4821:2022
Price: 25 EUR
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Plain bearings — Dynamic adhesion test method for DLC coated parts under lubricated condition

Название (английский):

ISO 4821:2022

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

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 13
Дата публикации:: 18 мая 2022 г.
Издание:: ISO IS 4821 edition 1 version 1
ICS:: 21.100.10

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Цена:25 €

Описание (английский):

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.

Abstract

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 < 0.02 μm Ra (ISO 21920-2), substrate hardness recommended ≥ HRC 60 or 700 HV.
Apparatus:
- Ball-on-disk rig capable of loads up to 5 kN and speeds of at least 100 min⁻¹.
- Oil bath or circulation lubrication with temperature control (example: maintain oil within ±2 °C of set temperature at 80 °C).
- AE sensor range recommended 10 kHz to 1 000 kHz (see ISO 12713), sensor mounting via AE sensor holder contacting the upper frame to pick up events through the ball assembly.
- AE amplifier with filtering and a universal counter or acquisition system allowing adjustable trigger threshold and cumulative AE event logging.
Procedure highlights: Pre-treatment of specimens, stepwise loading while monitoring AE events, repeatability requirements, and post-test observations (disk and ball inspection, optional friction force measurement).

Practical applications and users

Who uses it: automotive OEMs, bearing and engine component manufacturers, DLC coating suppliers, materials and tribology test labs, and QA/ R&D teams evaluating coating adhesion.
Use cases:
- Routine quality control of DLC-coated plain bearings and sliding engine parts (e.g., valve lifters, piston rings).
- Comparative screening of coating processes, substrates, or lubricant effects before full-scale engine tests.
- Correlating lab-scale adhesion performance with engine-test results (see Annex A and Annex B for positioning and correlation examples).

Related standards

ISO 20523 (DLC coating specifications)
ISO 683-17 (bearing steels)
ISO 1101 (geometrical tolerancing)
ISO 21920-2 (surface texture)
ISO 12713 (AE sensor guidance)

ISO 4821:2022 provides a standardized, cost-effective lab method combining ball-on-disk tribology and AE detection to assess DLC coating adhesion under lubricated, engine-relevant conditions.

Технические детали

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

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