introduction
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ISO 23737-2021 “Methods for evaluating wear and friction properties of fine ceramics (advanced ceramics, advanced technical ceramics) thin films under wet and dry conditions”
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This document was prepared by the ISO/TC 206 Technical Committee on Fine Ceramics.
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introduce
Fine ceramic films are used in a variety of applications, such as sensors, actuators or other micromechanical components; Display element; Memory element; Recording media; Optical components; Packaging film; As well as films and glass for buildings and vehicles. In the industrial application of fine ceramic films, wear resistance is an important index for evaluation. The wear resistance of fine ceramic films is greatly affected by the ambient humidity and the humidity history of the films. Fine ceramic films are also used in different humidity environments, requiring criteria for evaluating wear resistance and coefficient of friction over a wide humidity range. The standards published to date for wear resistance testing only assume a temperature environment of 23 °C and a relative humidity of 50%; The thickness of the film to be measured is also relatively large, several to 10μm. These test procedures are not suitable for evaluating the wear resistance of fine ceramic films with thickness up to approximately 1 µm and applied to electronic and optical devices because the wear resistance of small indentation loads is affected by relative humidity in the test environment, i.e. the mechanism used in the wear testing of fine ceramic films with small indentation loads is strongly affected by the relative humidity of the test environment. Therefore, the wear test of fine ceramic films should be carried out under the specified relative humidity conditions. This document provides measurement methods that help to accurately evaluate the wear resistance of fine ceramic films in dry and high humidity environments, such films can be up to about 1 µm thick and deposited on thin substrates or organic polymer films. The purpose of this document is to promote industrial development through the rapid dissemination of these measurement methods.
ISO 23737-2021 “Methods for evaluating wear and friction properties of fine ceramics (advanced ceramics, advanced technical ceramics) thin films under wet and dry conditions”
1 Scope of Application
This document specifies a method for testing the wear resistance and friction coefficient of fine ceramic films in dry and high humidity environments, where such films may be up to approximately 1 µm thick and deposited on a substrate or base, including thin or very thin organic polymer film substrates.
2 Normative reference documents
When the following documents are referenced in the text, some or all of them constitute the requirements of this document. For dated references, only the cited version applies. For undated citations, a new version of the referenced document (including any revisions) applies.
ISO 3274, Geometric Product Specification (GPS) – Surface texture: profiling method – Nominal characteristics of contact (stylus) instruments
ISO 13565-1, Geometric Product Specification (GPS) – Surface texture: section method Surfaces with layered functional properties – Part 1: filtration and general measurement conditions
ISO 13565-2, Geometric Product Specification (GPS) – Surface texture: Section method Surfaces with layered functional properties – Part 2: Characterization of height using linear material ratio curves
ISO 20507, Fine ceramics (Advanced ceramics, advanced Technical ceramics) – Vocabulary
ISO 23737-2021 “Methods for evaluating wear and friction properties of fine ceramics (advanced ceramics, advanced technical ceramics) thin films under wet and dry conditions”
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 20507 and the following apply.
3.2 Friction Force
The resistance exerted on a relative body when objects in contact move or tend to slide against each other
3.3 Friction coefficient
The dimensionless ratio of friction to applied normal force
3.4 Wear Test
Tests to evaluate the friction and wear characteristics caused by sliding contact motion
Note 1: In a narrow sense, the term “wear test” refers to the process by which wear occurs on the specimen as a result of sliding motion; In a broad sense, it means processes such as sample preparation, wear formation, friction coefficient measurement, and evaluation of wear tracks and wear parts formed on inverse materials.
ISO 23737-2021 “Methods for evaluating wear and friction properties of fine ceramics (advanced ceramics, advanced technical ceramics) thin films under wet and dry conditions”
3.5 Drying Chamber
A sealed container for removing moisture from the specimen surface while the specimen is kept in a vacuum
3.6 Relative Humidity
The ratio of partial pressure of water vapor to saturated vapor pressure at a given temperature
3.7 Dry air
Air with a dew point of −60 °C or lower at an absolute pressure of 101.3 kPa
3.8 Dry Nitrogen
Nitrogen with a dew point of −60 °C or less at an absolute pressure of 101.3 kPa
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