ISO 26423:2009

Name: ISO 26423:2009 — Fine ceramics (advanced ceramics, advanced technical ceramics) — Determination of coating thickness by crater-grinding method
SKU: ISO 26423:2009
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Fine ceramics (advanced ceramics, advanced technical ceramics) — Determination of coating thickness by crater-grinding method

Название (английский):

ISO 26423:2009

Fine ceramics (advanced ceramics, advanced technical ceramics) — Determination of coating thickness by crater-grinding method

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 15
Дата публикации:: 12 января 2009 г.
Издание:: ISO IS 26423 edition 1 version 1
ICS:: 81.060.30

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Full version27 000 ₽Read online 24h1 200 ₽Read online 72h1 800 ₽

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Цена:27 000 ₽

Описание (английский):

ISO 26423:2009 specifies a method for the determination of the thickness of ceramic coatings by a crater grinding method, which includes the grinding of a spherical cavity and subsequent microscopic examination of the crater. Because of the uncertainty introduced into the measurement of crater dimensions, the test is not suitable for use where the surface roughness of the coating and/or substrate exceeds 20 % of the coating thickness.

Abstract

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Стандарты, упомянутые в описании

Overview

ISO 26423:2009 specifies the crater-grinding method for determining the thickness of ceramic coatings on fine/advanced ceramics (advanced technical ceramics). The method produces a spherical crater by rotating a ball wetted with an abrasive slurry against the coated surface. Coating thickness is calculated from measured crater dimensions and the ball radius. Note: the test is not suitable when surface roughness of the coating or substrate exceeds 20% of the coating thickness.

Key topics and requirements

Principle: grind a spherical cavity with a rotating ball and abrasive slurry, then examine crater geometry microscopically to find the coating–substrate interface.

Mandatory conditions:

Adequate optical contrast between coating and substrate (or use SEM/etching).
Smooth, flat specimens (local radius of curvature criteria given in the standard).
Clean specimen and ball preparation (e.g., ultrasonic cleaning).

Test parameters (to be selected/recorded):

Ball diameter, contact load, sliding speed, abrasive type and concentration, slurry feed rate, test duration.
Example parameters: 25 mm ball, 0.25 N load, 100 r/min, 1 µm diamond in ethanol (1:4), 20 drops/min, 5 min (typical for 3–5 µm hard coatings).

Measurements:

Measure outer (D) and inner (d) crater diameters (or X and Y projections), using calibrated imaging.
At least five measurements to assess repeatability.

Calculations:

Preferred formula for thickness: h = (D^2 − d^2) / (8 r), or simplified forms h = (X·Y)/(2 r) for small penetrations.
Can be applied to multilayers by selecting appropriate crater circles.

Uncertainty & errors:

Main error sources: crater dimension uncertainty, deviations from circularity, mismatch between crater and ball radii.
Standard includes annexes on error sources and uncertainty estimation.

Reporting:

Reports should follow ISO/IEC 17025 requirements and include test parameters, results, uncertainty, and micrographs with calibrated scale.

Applications and users

Useful for quality control, process monitoring and R&D of coated ceramic components, cutting tools, wear-resistant parts, and functional thin films on ceramics.

Typical users: ceramic manufacturers, coatings suppliers, materials testing laboratories, tribology labs, and tooling engineers seeking an accessible, reproducible method to measure coating thickness on advanced ceramics.

Related standards

ISO 18452 - Step height method (alternative thickness measurement using profilometry)

ISO 3290-1 - Specification for bearing balls (used as grinding balls)

ISO/IEC 17025 - Laboratory competence and reporting requirements

Keywords: ISO 26423:2009, crater-grinding method, fine ceramics, coating thickness, advanced ceramics, measurement uncertainty, abrasive slurry, ball diameter, microscopic examination.

ISO 26423:2009

Abstract

Похожие стандарты

Overview

Key topics and requirements

Applications and users

Related standards

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