Comparative tribological and adhesion studies of some titanium-based ceramic coatings

Helena Ronkainen, Kenneth Holmberg, Kevin Fancey, Allan Matthews, Bernd Matthes, Erhard Broszeit

Research output: Contribution to journalArticleScientificpeer-review

4 Citations (Scopus)

Abstract

In this work different evaluation methods for thin hard coatings were studied in three laboratories. Different coatings and test equipment were used. An agreement on the procedure for testing and data appraisal was made.
The results obtained in the different laboratories varied depending on the test procedure used.
Two test methods, ball crater and scratch test, yielded smaller variations in the results, whereas the hardness measurements and pin-on-disc tests had larger variations, although in the former case these were within the standard deviations of the readings.

It is clear from this work that tests performed in different laboratories cannot be used for comparison purposes, unless strict agreement is reached on the exact test procedure and on the basis of interpretation of the results.
Even tests carried out under nominally identical conditions in one laboratory can in some cases give a spread in performance, since many variables, such as friction coefficient, wear rate and hardness, are not intrinsic materials properties and can statistically vary.
It is thus important to devise standardized test methods, and in all cases to quote the standard deviations on data.
Original languageEnglish
Pages (from-to)888-897
JournalSurface and Coatings Technology
Volume43-44
Issue numberPart 2
DOIs
Publication statusPublished - 1990
MoE publication typeA1 Journal article-refereed

Fingerprint

ceramic coatings
Ceramic coatings
Titanium
adhesion
Adhesion
titanium
Hardness
Hard coatings
Materials properties
standard deviation
Wear of materials
hardness
Friction
Coatings
coatings
Testing
test equipment
craters
coefficient of friction
balls

Cite this

Ronkainen, Helena ; Holmberg, Kenneth ; Fancey, Kevin ; Matthews, Allan ; Matthes, Bernd ; Broszeit, Erhard. / Comparative tribological and adhesion studies of some titanium-based ceramic coatings. In: Surface and Coatings Technology. 1990 ; Vol. 43-44, No. Part 2. pp. 888-897.
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Comparative tribological and adhesion studies of some titanium-based ceramic coatings. / Ronkainen, Helena; Holmberg, Kenneth; Fancey, Kevin; Matthews, Allan; Matthes, Bernd; Broszeit, Erhard.

In: Surface and Coatings Technology, Vol. 43-44, No. Part 2, 1990, p. 888-897.

Research output: Contribution to journalArticleScientificpeer-review

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AU - Ronkainen, Helena

AU - Holmberg, Kenneth

AU - Fancey, Kevin

AU - Matthews, Allan

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AU - Broszeit, Erhard

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PY - 1990

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AB - In this work different evaluation methods for thin hard coatings were studied in three laboratories. Different coatings and test equipment were used. An agreement on the procedure for testing and data appraisal was made. The results obtained in the different laboratories varied depending on the test procedure used. Two test methods, ball crater and scratch test, yielded smaller variations in the results, whereas the hardness measurements and pin-on-disc tests had larger variations, although in the former case these were within the standard deviations of the readings.It is clear from this work that tests performed in different laboratories cannot be used for comparison purposes, unless strict agreement is reached on the exact test procedure and on the basis of interpretation of the results. Even tests carried out under nominally identical conditions in one laboratory can in some cases give a spread in performance, since many variables, such as friction coefficient, wear rate and hardness, are not intrinsic materials properties and can statistically vary. It is thus important to devise standardized test methods, and in all cases to quote the standard deviations on data.

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