ISO 4821:2022
Plain bearings — Dynamic adhesion test method for DLC coated parts under lubricated condition
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
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
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
Технические детали
- Технический комитет
- ISO/TC 123/SC 7 - Special types of plain bearings
- SKU
- ISO 4821:2022
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