Silicon nitride coating on titanium to enable titanium-ceramic bonding

✍ Scribed by Wang, Russell R. ;Welsch, Gerhard E. ;Monteiro, Othon

• Publisher: John Wiley and Sons
• Year: 1999
• Tongue: English
• Weight: 564 KB
• Volume: 46
• Category: Article
• ISSN: 0021-9304
• DOI: 10.1002/(sici)1097-4636(199908)46:2<262::aid-jbm16>3.0.co;2-1

✦ Synopsis

Failures that occur in titanium-ceramic restorations are of concern to clinicians. The formation of poorly adhering oxide on titanium at dental porcelain sintering temperatures causes adherence problems between titanium and porcelain, which is the main limiting factor in the fabrication of titanium-ceramic restorations. To overcome this problem a 1-m thick Si 3 N 4 coating was applied to a titanium surface using a plasma-immersion implantation and deposition method. Such a coating serves as an oxygen diffusion barrier on titanium during the porcelain firings. The protective coating was characterized in the as-deposited condition and after thermal cycling. Cross sections of Ti/ Si 3 N 4 -porcelain interface regions were examined by various electron microscopy methods and by energy dispersive analysis of X-rays to study the Si 3 N 4 film's effectiveness in preventing titanium oxidation and in forming a bond with porcelain. The experiments have shown that this Si 3 N 4 coating enables significant improvement in Ti-ceramic bonding.