MICROSTRUCTURE AND TRIBOLOGICAL PROPERTIES OF Ti BORIDED BY ELECTRON BEAM EVAPORATION TECHNIQUE

KARA G., PÜRÇEK G., ATASOY Y., BACAKSIZ E.

JOURNAL OF THE BALKAN TRIBOLOGICAL ASSOCIATION, cilt.21, sa.1, ss.24-37, 2015 (SCI-Expanded) identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 21 Sayı: 1
  • Basım Tarihi: 2015
  • Dergi Adı: JOURNAL OF THE BALKAN TRIBOLOGICAL ASSOCIATION
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.24-37
  • Anahtar Kelimeler: titanium, bonding, friction and wear, electron beam evaporation technique, microstructure, SOLID-STATE DIFFUSION, TITANIUM-ALLOYS, WEAR BEHAVIOR, SURFACE, GROWTH, KINETICS, LAYERS, PERFORMANCE, MODEL
  • Karadeniz Teknik Üniversitesi Adresli: Evet

Özet

In this work, boron was deposited on commercially pure titanium (grade-2) samples using electron beam evaporation (EBE) technique at various temperatures and time intervals. Scanning electron microscope (SEM) and X-ray diffraction (XRD) analyses indicated that surface structure of bonded samples were comprised of monolithic titanium diboride (TiB2) layer on the top and TiB whiskers towards the substrate. It was revealed that bonding by EBE resulted in a hard adhered surface structure after annealing especially at 900 C for 24 h. Dry wear test together with micro-indentation study were performed after morphological analyses of boride layers. Bonding at 900 degrees C for 24 h brought about a significant improvement in wear resistance of Ti, especially under low loads. The bonded surface exhibited higher wear resistance along with higher friction coefficient as compared to as-received one under the same conditions.