The boriding process in CoCrMo alloy: Fracture toughness in cobalt boride coatings

Campos-Silva, I.; Bravo-Bárcenas, D.; Çi̇menoǧlu, Hüseyin; Figueroa-López, U.; Flores-Jiménez, M.; Meydanoğlu, Onur

doi:10.1016/j.surfcoat.2014.07.092

Cited by 43 publications

(18 citation statements)

References 23 publications

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“…Also, the fracture toughness value of hot-pressed TiB 2 -2.5 wt.% MoSi 2 composites was reported as about 6 MPa.m 1/2 [61]. Dissimilar to the composite structures, the fracture toughness data of the Co 2 B coatings obtained using the Vickers depth-sensing microindentation technique was in the range of 4.6-5.4 MPa.m 1/2 [64]. Considering the reported fracture thoughness values for different types of boride-related materials, the measured values for the N5-2CoPS and N5-5CoPS samples in this investigation can be evaluated as high enough to be obtained via powder metallurgy and cold pressing/pressureless sintering with the use of Co additive.…”

Section: Mechanical Properties Of the Sintered Productsmentioning

confidence: 93%

Effect of sintering techniques on the microstructure and mechanical properties of niobium borides

Balcı

Ağaoğulları

Muhaffel

et al. 2016

Journal of the European Ceramic Society

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a b s t r a c tThis study reports on the consolidation of niobium boride powders by cold pressing/pressureless sintering (PS, with or without Co addition) and spark plasma sintering (SPS) techniques. Niobium boride powders (containing NbB, Nb 3 B 4 and NbB 2 phases) which were mechanochemically synthesized from Nb 2 O 5 , B 2 O 3 and Mg blends and purified by HCl leaching were used as precursor material. The effects of different sintering techniques on the consolidation behaviour, microstructure, densification rate and mechanical properties (microhardness, wear characteristics, elastic modulus, indentation response and fracture toughness) of the bulk products were investigated. PS with Co addition resulted in superior properties than those yielded after PS without Co addition and SPS. Bulk niobium boride products having relative density of 93-98%, microhardness of 24-28 GPa, wear volume loss of 2.8-4.5 × 10 −4 mm 3 , elastic modulus of 508-552 GPa and fracture toughness of 4.05-4.74 MPa m 1/2 were obtained by Co (2 or 5 wt.%) activated PS at 1500 • C.

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Section: Mechanical Properties Of the Sintered Productsmentioning

confidence: 93%

Effect of sintering techniques on the microstructure and mechanical properties of niobium borides

Balcı

Ağaoğulları

Muhaffel

et al. 2016

Journal of the European Ceramic Society

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“…Vickers indentations were prepared on the cross section of the coating with a load of 30 kg and dwell time of 15 s using a HBRV-187.5 Vickers-hardness, and morphologies of indentations were observed using S-3400 scanning electron microscope equipped (SEM). Base on fracture mechanics theories of indentation, the driving force for crack propagation was caused by the load pressure, so fracture toughness of the coatings was evaluated by observing the length of the indentation crack which acted as an indirect evaluation [31][32][33][34]. To ensure the reliability of the results, the standard sample was used for the calibration before testing, and fracture toughness of the coating was evaluated by using multiple measurements way to accomplish.…”

Section: Mechanical Properties Testmentioning

confidence: 99%

Mechanical properties and toughening mechanism of TiB2/NiTi reinforced titanium matrix composite coating by laser cladding

Lin

Liu

et al. 2015

Materials & Design

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“…Boron has also been used in CoCrMo alloys for coatings in boronizing processes at high temperatures (~1000 • C) in which metallic borides are formed at the surface. Mechanical properties and fracture toughness of these coatings have been studied with microindentation techniques [16,17]. It has been reported that boronizing improved the wear resistance of CoCrMo alloys due to the high surface hardness achieved during the process [18,19].…”

Section: Introductionmentioning

confidence: 99%

Influence of Boron Addition on the Microstructure and the Corrosion Resistance of CoCrMo Alloy

Hernández-Rodríguez

Laverde-Cataño

Lozano

et al. 2019

Metals

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Cobalt-based alloys are extensively used in orthopedic applications for joint replacements due to their wear and corrosion resistance. Corrosion, however, is often associated with fatigue failure in these orthopedic devices. In this study, the effect of boron addition on the corrosion behavior of CoCrMo alloys was studied using linear polarization resistance, potentiodynamic polarization curves, electrochemical impedance spectroscopy, and cyclic voltammetry. The samples were analyzed under as-cast and heat treatment conditions after 21 days of immersion in phosphate-buffered saline (PBS) solution at 37 °C. The boron addition increased the particle content, while the heat treatment promoted enlargement and even distribution of the precipitates throughout the structure. The corrosion resistance was improved by both boron and heat treatments. The best performance was observed for a heat-treated alloy having a very small amount of boron, which had an increased resistance to corrosive attack. Such behavior was attributed to the homogenized microstructure achieved by boron and heat treatment that helped to form a stable passive layer of chromium oxide which endured the 21 days of immersion.

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The boriding process in CoCrMo alloy: Fracture toughness in cobalt boride coatings

Cited by 43 publications

References 23 publications

Effect of sintering techniques on the microstructure and mechanical properties of niobium borides

Effect of sintering techniques on the microstructure and mechanical properties of niobium borides

Mechanical properties and toughening mechanism of TiB2/NiTi reinforced titanium matrix composite coating by laser cladding

Influence of Boron Addition on the Microstructure and the Corrosion Resistance of CoCrMo Alloy

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