BS ISO 21714:2018 pdf download

BS ISO 21714:2018 pdf download.Fine ceramics (advanced ceramics, advanced technical ceramics) — Test method for determining density of ceramic coatings
1 Scope
This document specifies a testing method for determining the density of thick ceramic coatings at ambient temperature using the Archimedes method. Methods for test piece preparation, test modes,data collection and density calculation are addressed.
This document applies to ceramic coatings with a thickness > 0,1 mm including thermal barrier coatings, wear-resistance coatings and other thick coatings on metal or ceramic substrates.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 3611, Geometrical product specifications (GPS) — Dimensional measuring equipment: Micrometers for external measurements — Design and metrological characteristics
ISO 18754, Fine ceramics (advanced ceramics, advanced technical ceramics) — Determination of density and apparent porosity
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at http://www.electropedia.org/
3.1 volume
apparent solid volume, the sum of the respective volumes of the solid material
3.2 density
apparent solid density, the ratio of the mass of the dry material to its apparent solid volume
4 Principle
The density of ceramic coating on a substrate is determined by comparing the densities of the coated and uncoated sample, under the precondition that the interface between the coating and the substrate is continuous and without a debonding zone. The density of the ceramic coating is obtained from three parameters: i) the density of the uncoated substrate (ρ S ); ii) the equivalent density of the coated sample ( ρ ); and iii) the ratio of the dry weight of the substrate to that of the coated sample (k = m s /m). The values of ρ and ρ are determined by the Archimedes method according to ISO 18754, and they are related to the density of the coating via a unique formula.
5 Apparatus
5.1 Density testing apparatus
The apparatus for density tests shall conform to the requirements of ISO 18754.
5.2 Dimension measuring device
A vernier calliper with a precision of 0,02 mm according to ISO 3611 shall be used to measure the overall dimensions of the sample. The thickness of the coating and the substrate shall be measured by using an optical or electronic microscope with a magnification of 1 000 times or more.