Evaluation of TiB2 coatings in cold forming of aluminium
2012 (English)In: Surface Engineering, ISSN 0267-0844, Vol. 28, no 7, 517-525 p.Article in journal (Refereed) Published
Aluminium alloy parts are often formed using cold forming. The transfer of aluminium to the tool is a major problem in these operations. TiB2 has low reactivity with aluminium and has shown promising results in other forming tests. Here, cold forming is simulated in equipment comprising a TiB2 coated tool cylinder and an aluminium cylinder in sliding contact. The coated surfaces are prepared to two surface finishes, and the aluminium cylinders were prelubricated or unlubricated respectively. The test is focused on friction level and number of contacts to reach a threshold friction level. The aluminium surface pretreatment was found to be the most important factor; lubrication lowers the friction significantly. The tool surface finish is also important; polishing lowers and stabilises the friction. The TiB2 coating offered 20‐30% better galling performance than the uncoated steel. However, this improvement was far from that of the best available diamond-like carbon coatings.
Place, publisher, year, edition, pages
2012. Vol. 28, no 7, 517-525 p.
Engineering and Technology
Research subject Engineering Science with specialization in Materials Science
IdentifiersURN: urn:nbn:se:uu:diva-167056DOI: 10.1179/1743294412Y.0000000017ISI: 000307963500009OAI: oai:DiVA.org:uu-167056DiVA: diva2:480629