Effect of sintering duration on the sliding‐wear resistance of 3Y‐TZP dental ceramics

Abstract

Zirconia doped with 3 mol% yttria (3Y‐TZP) is widely employed in prosthetic dentistry. The standard routine in the manufacture of prostheses involves subtractive machining of a commercial presintered block, followed by pressureless sintering up to full densification using one of the heat treatments indicated by the supplier, so as to obtain adequate strength. Usually, however, little information is provided on how these treatments affect the wear resistance. The present work therefore investigated how three sintering cycles of different durations recommended by a commercial supplier affected the microstructure and long‐term degradation in the form of sliding‐wear of the resulting 3Y‐TZP ceramics. It was found that the three cycles essentially resulted in the same wear behavior (ie, wear modes and mechanisms, as well as specific wear rate ~5·10–6 mm3/Nm). The results are analyzed within the framework of existing abrasive wear models, and implications for the manufacture of durable prostheses are discussed.

Microstructure performance enhancement of Si3N4 reinforced laser clad KF110 base composite coatings

“…APs were formed due to the enhancement of the solid/liquid interface energy and the low driving force of crystallization, retarding crystal nucleation/growth during a liquid cooling process under an action of the segregation of different atoms. The relative motions between the atoms were retarded due to the compact stacking structure of APs free of the dislocations, reinforcing this coating 31 . The micro‐hardness of this coating can be enhanced due to the anchoring/strengthening effect with the existence of NPs 32 .…”

“…The relative motions between the atoms were retarded due to the compact stacking structure of APs free of the dislocations, reinforcing this coating. 31 The micro-hardness of this coating can be enhanced due to the anchoring/strengthening effect with the existence of NPs. 32 The lattice distortions were noted in the middle coating (see Figure 2D).…”