Effect of microstructure on the adhesion strength of TiBx coating on Ti6Al4V substrate. Issue 4 (15th February 2021)

• Record Type: Journal Article
• Authors: Wu, Bi; Gao, Siyang; Xue, Weihai; Li, Shu; Duan, Deli
• Is Part Of: Ceramics international. Volume 47:Issue 4(2021)
• Page Start: 5019
• Page End: 5027
• Publication Date: 2021-02-15
• Subjects: Titanium diboride -- Magnetron sputtering -- Microstructure -- Adhesion strength -- High-speed rubbing; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2020.10.078
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: TiB x coatings were deposited on Ti6Al4V and Si (100) wafer substrates by D.C. magnetron sputtering with various target-to-substrate distances (T.S. distances) from 50 mm to 200 mm. The influence of T.S. distance on the microstructure, hardness and adhesion strength of TiB x coatings and Ti6Al4V substrate system was investigated. Results showed that the microstructure of TiB x coatings transformed from dense to fibre columnar grain with the increase in T.S. distance, whilst the hardness decreased from 20.9 GPa to 9.4 GPa. The Rockwell-C indentation adhesion strength grade was also improved from HF6 to HF1. An adhesion evaluation factor G, which is related to the mechanical properties and the microstructure of TiB x coating, is proposed based on the test results. The adhesion strength increased with G, which corresponded well with the results of indentation test. The high-speed rubbing test with a sliding speed of 300 m/s was performed to check the Al-adhesion resistance of the TiB x coating against Al–hBN seal coating.