Surface finish and mechanical strength of dense alumina

Tomba, A.G; Cavalieri, A.L.

doi:10.1016/s0025-5408(00)00311-1

Cited by 8 publications

(4 citation statements)

References 7 publications

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“…The machined surfaces were previously analyzed 5,6 by SEM, surface roughness, and residual stresses measurements. The main observations are given below.…”

Section: (2) Characterizationmentioning

confidence: 99%

“…Both C and F materials were tested in specific mechanical and thermal shock conditions, which produced similar equibiaxial stress distributions on the surface of the disk. [5][6][7] Namely, the fracture strength was evaluated in biaxial flexure, employing a ball on discontinuous ring fixture (ball diameter, 8.04 Ϯ 0.02 mm; ring diameter, 19.50 Ϯ 0.1 mm) in a servohydraulic testing machine (Model 8502, Instron Corp., Danvers, MA) at a displacement rate of 0.05 mm/min. The fracture strengths ( F ) were higher for the C specimens (296 Ϯ 59 MPa (fifteen specimens)) than for the F specimens (220 Ϯ 66 MPa (twenty specimens)).…”

Section: (3) Mechanical and Thermal Shock Testsmentioning

confidence: 99%

“…7 The influence of the machined surface features (microstructure, surface roughness, and residual stresses) on these properties was analyzed elsewhere. [5][6][7]…”

Section: (3) Mechanical and Thermal Shock Testsmentioning

confidence: 99%

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Fracture Analyses of Alumina Subjected to Mechanical and Thermal Shock Biaxial Stresses

Tomba-Martinez

Cavalieri

2002

Journal of the American Ceramic Society

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7600) Mar del Plata, ArgentinaDisks of commercial alumina were fabricated by slip casting and sintering. Two surface finishes were performed: coarse (denoted as "C") using a 70 grit diamond wheel and fine (denoted as "F") with 120 and 320 grit SiC papers. The machined surfaces were analyzed by SEM, profilometry, and residual stresses measurements. The fracture strength was evaluated in biaxial flexure, and the thermal shock resistance was tested by cooling with a high-velocity air jet. The fracture of the specimens under both conditions was studied analyzing crack patterns and fracture surfaces in relation to the surface machining and type of loading, i.e., mechanical and thermal stresses.

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“…The machined surfaces were previously analyzed 5,6 by SEM, surface roughness, and residual stresses measurements. The main observations are given below.…”

Section: (2) Characterizationmentioning

confidence: 99%

Section: (3) Mechanical and Thermal Shock Testsmentioning

confidence: 99%

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Fracture Analyses of Alumina Subjected to Mechanical and Thermal Shock Biaxial Stresses

Tomba-Martinez

Cavalieri

2002

Journal of the American Ceramic Society

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“…However, its high fragility and low strength restricted its application in the weight-bearing parts in the human body, so the selective addition of second-phase particles and whiskers as well as other methods were adopted to improve its mechanical properties. Xu Shuhua and Huang Chuanyong also made studies on the microstructures and properties of HA-ZrO 2 composite materials [7,8]. For the past few years, artistic and non-toxic all-ceramic restoration with superior biocompatibility has become a research frontier and the development direction of the Prosthetic Dentistry.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigations of Mechanical Characteristics and Tribological Mechanisms of Nanometric Zirconia Dental Ceramics

Li¹

2011

TOMSJ

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This study was focused on the experimental investigations about mechanical characteristics and tribological mechanisms of nanometric zirconia dental ceramics. A universal mechanical testing machine was used to test the threepoint flexural strength and the fracture toughness. A microhardness tester was used to test the Vickers hardness of the test specimens. An MRH-3 digital-display high-speed ring-on-block tribometer was used for frictional wear experiments. A PGI800 coarseness profiling instrument was used to test the width and the length of the grinding defects on specimen surfaces. An S-3500N SEM was employed in the microscopic observation of the surface morphology after the abrasion. Results indicates that the flexural strength of the test specimens 890MPa, the fracture toughness 6Mpa.m 1/2 , the Vickers hardness 1240MPa, the linear contraction 21%, and the apparent porosity 0.32%. Moreover, the frictional factor and the wear rate of nanometric ZrO 2 ceramics decreased significantly under identical working and frictional conditions compared with ZrO 2 . The wear mechanism of nanometric ZrO 2 ceramics was micromachining and plastic deformation while the wearing mechanism of ZrO 2 ceramics was brittle fracture and abrasive wear.

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