Unprecedented simultaneous enhancement in damage tolerance and fatigue resistance of zirconia/Ta composites

Abstract

Dense (>98 th%) and homogeneous ceramic/metal composites were obtained by spark plasma sintering (SPS) using ZrO2 and lamellar metallic powders of tantalum or niobium (20 vol.%) as starting materials. The present study has demonstrated the unique and unpredicted simultaneous enhancement in toughness and strength with very high flaw tolerance of zirconia/Ta composites. In addition to their excellent static mechanical properties, these composites also have exceptional resistance to fatigue loading. It has been shown that the major contributions to toughening are the resulting crack bridging and plastic deformation of the metallic particles, together with crack deflection and interfacial debonding, which is compatible with the coexistence in the composite of both, strong and weak ceramic/metal interfaces, in agreement with predictions of ab-initio calculations. Therefore, these materials are promising candidates for designing damage tolerance components for aerospace industry, cutting and drilling tools, biomedical implants, among many others.

Current state‐of‐the‐art and future perspectives of the three main modern implant‐dentistry concerns: Aesthetic requirements, mechanical properties, and peri‐implantitis prevention

“…Recently, Smirnov et al have developed a new zirconium dioxide–tantalum (ZrO 2 –Ta) ceramic–metal composite, or biocermet, with an unprecedented combination of high toughness, strength, damage tolerance, and fatigue resistance. The field of modern dentistry could take advantage of this biocermet's mechanical properties, using it for screw‐retained restorations, for example, to extend the lifetime of dental implants.…”

“…Gibbs et al 74 measured the occlusal force produced during chewing and swallowing for humans under normal conditions and found that the average force applied at cusp is calculated to be 242 N. The fatigue limit was determined as the stress at which no failure occurred in two million cycles (N f = 2 × 10 6 cycles), which represents 4 years of simulated function if the daily masticatory number per day is estimated to be 1400 cycles. 74 Recently, Smirnov et al 75,76 have developed a new zirconium dioxide-tantalum (ZrO 2 -Ta) ceramic-metal composite, or biocermet, with an unprecedented combination of high toughness, strength, damage tolerance, and fatigue resistance. The field of modern dentistry could take advantage of this biocermet's mechanical properties, using it for screw-retained restorations, for example, to extend the lifetime of dental implants.…”

Direct Ink Writing Technology (3D Printing) of Graphene-Based Ceramic Nanocomposites: A Review

“…Thanks to these properties, ceramics are used in multifunctional applications such as biomedical engineering, electronics, aerospace, chemical industry, and machinery [2]. Note that the advantage of ceramics over other materials is the ability to obtain predetermined characteristics by changing the raw materials composition and the production technology [3][4][5][6][7][8]. Commonly, raw materials are composed by mixtures of ceramic powders with or without binders and additives, and these mixtures are used to form green bodies with desired simple shape by different forming methods as dry pressing, slip casting, injection molding, gel casting, tape casting, extrusion and others [9,10].…”

The influence of hydrojet surface processing on the adhesive strength of wear-resistant coatings deposited on a metal-cutting tool of oxynitride ceramics

“…It is well known that insufficient fracture toughness becomes a reason for microcracks formation and propagation on the surface of ceramic cutting tools [1][2][3]. One of the most effective methods to increase reliability of the ceramic tools is to deposit thin-film wearresistant coatings by physical vapor deposition (PVD) technique [4,5].…”