ISO 19207:2016 溶射—押し込みによる接着強度の分類方法 | ページ 2

Foreword

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The committee responsible for this document is ISO/TC 107, Metallic and other inorganic coatings.

Introduction

Adhesion of coatings specified here is required for three reasons:

• for selection of coating material and spray method;
• for quality assurance of thermal spraying;
• for product design and performance assessment of coatings.

This International Standard provides the classification method of adhesive strength for thermal spray coatings by using Vickers hardness testing machine generally and widely used. In the present test method, a pyramidal Vickers diamond indenter is indented with test force at the interface of coatings. When the test force exceeds the threshold value corresponding to the adhesive strength, an interfacial crack is generated. Accordingly, it is possible to evaluate the adhesive strength of coatings by the test force applied as discrete values when using conventional Vickers testing machine. This International Standard classifies the adhesive strength, called adhesion index, evaluated from the maximum indentation force without visible cracking and can be also applied to evaluate coatings with a high adhesive, such as cermet coatings. The present test method can be applied to sprayed coatings if the crack initiated by the indentation can be observed by using optical microscope.

The maximum indentation force does not therefore require much more effort in the experimental procedure and can describe the property of system combination (substrate chemistry, pre-preparation/roughness of substrate surface, coating chemistry and spraying related coating properties), provided the measurements are obtained carefully in line with the methods proposed in this International Standard. This International Standard recommends good practice to minimize levels of uncertainty in the measurement process. The procedure has been validated through underpinning technical work within the round robin test programme conducted by the Subcommittee on Standard Development, Japan Thermal Spray Society.

1 Scope

This International Standard specifies the classification method of adhesive strength for thermal spray coatings at room temperature by using Vickers hardness testing machine. This International Standard classifies the adhesive strength, called adhesion index, evaluated from the maximum indentation force without visible cracking, and it is applicable for relative dense metal coatings, ceramic coatings and cermet coatings. This International Standard can be used within comparison within each coating system.

The indentation method is not recommended for very thin and very porous coatings and also for the coating system with lower cohesion strength than adhesion strength. It is recommended that this test method can be applied for a coating of which porosity is less than approximately 15 %.

2 Normative references

The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 14917, ISO 14923 and the following apply.

Bibliography