Improvement in anti-flaking properties of DLC-Si coatings and applications to forming die

Y. Tsuchiya, K. Dohda, K. Kitamura

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Improvement of not only lubricity but also the quality of die materials is desired in the fields where the difficult-to-form materials such as aluminum, stainless steel and high tensile steel sheets are formed. Aluminum is also difficult-to-form material because of its seizure property. Recently DLC(Diamond Like Carbon) which has quite low friction is used and VC coating by TRD(Thermo-reactive Deposition and Diffusion) process is reevaluate in forming high intensity materials. But it is entirely inadequate to adopt the evaluating methods for characteristics of exfoliation resistance. The method used most widely is the scratch test. However, practical limit is not clear to use for judging method of selecting coatings. Therefore the damage behavior accompanies the scratch of various coatings is observed and evaluated in conditions of some kinds of base metal, difference of hardness and the coating thickness. Through these observations the DLC-Si coating, which Toyota Central R & D Labs., Inc. developed, is evaluated to have superior adhesion performance. And the some metal forming type tribo-tests are conducted. The results of these tests are as follows; 1) DLC-Si coating has good anti-flaking property with preprocessing and coated on hard base metal. 2) DLC-Si coating shows the lowest friction coefficient in some metal forming tribo-tests under wide range sliding velocity and shows good anti-galling property in backward extrusion test. This shows DLC-Si coating is suitable for many metal forming dies.

Original languageEnglish (US)
Title of host publication9th International Conference on Technology of Plasticity, ICTP 2008
PublisherHanrimwon Publishing Co.
Pages1717-1722
Number of pages6
StatePublished - Jan 1 2008
Event9th International Conference on Technology of Plasticity, ICTP 2008 - Gyeongju, Korea, Republic of
Duration: Sep 7 2008Sep 11 2008

Other

Other9th International Conference on Technology of Plasticity, ICTP 2008
CountryKorea, Republic of
CityGyeongju
Period9/7/089/11/08

ASJC Scopus subject areas

  • Polymers and Plastics

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