BS EN 1071-12:2010 Advanced technical ceramics. Methods of test for ceramic coatings. Reciprocating wear test
BS EN 1071-12 is a European Standard which describes a method for evaluating the wear of ceramic coatings by use of a reciprocating wear test whereby a flat or spherically ended pin is reciprocated, under load, against a flat plate.
Depending on the conditions being simulated, either the pin or plate or both may be coated with the material under test, with the other member of the couple being selected for its relevance to the system under evaluation. The method described is considered to be not suitable for evaluating fretting wear.
The method is intended for evaluating coatings with a thickness of more than 1 μm, though might also be used for testing thinner coatings.
The test may be carried out under either dry or lubricated conditions. However, the test is not designed for evaluating the properties of lubricants except insofar as they affect the wear behaviour of the materials being tested. Related methods for testing lubricants using reciprocating motion are given in the references.
Testing a materials couple under a range of loading conditions might provide information about the adhesive and/or cohesive strength of the coating, in addition to its wear behaviour.
Contents of BS EN 1071-12:
Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Significance and use
5 Principle
6 Apparatus and materials
6.1 Apparatus construction
6.1.1 General
6.1.2 Friction measurement
6.2 Operating environment
7 Preparation of test pieces
7.1 Substrate material and preparation
7.2 Coating deposition
7.3 Post-coating preparation
7.4 Cleaning
8 Test procedure
8.1 Selection of test conditions
8.2 Preliminary set-up
8.3 Wear test
8.4 Evaluation of wear
8.4.1 Preliminary inspection
8.4.2 Measurement of wear scars
8.5 Calculation of wear results
9 Repeatability and limits
10 Test report
Annex A (informative) Issues related to dynamic measurements in reciprocating wear testing
A.1 Resonant frequencies
A.2 Frequency response
A.3 Phase angle errors
A.4 Further guidance
Annex B (informative) Methods for the determination of coating properties likely to be relevant to
coating performance in a reciprocating wear test
B.1 Relevant properties
B.2 Phase composition and preferred orientation.
B.3 Residual stress
B.4 Hardness
Annex C (informative) Examples of common wear mechanisms
Annex D (informative) Determination of volume loss from the pin using profilometry
Annex E (informative) Determination of wear of coated plate by ball crater technique
Bibliography