Improved sliding wear-resistance of alumina with sub-micron grain size: A comparison with coarser grained material

Roy, R Singha; Guchhait, H.; Chanda, Abhra; Basu, Debabrata; Mitra, M.K.

doi:10.1016/j.jeurceramsoc.2007.02.205

Cited by 52 publications

(30 citation statements)

References 26 publications

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“…Microstructural control by means of dopants and processing techniques can improve the mechanical properties of alumina-wear for example 16 . Thus, suppression of grain growth plays a crucial role.…”

Section: Resultsmentioning

confidence: 99%

“…Alumina is a typical engineering ceramic 1,5-7 used in structural applications 7 ; automotive, aerospace, biomedical, and ballistic applications 8 ; and cutting tools 9 . Many studies have shown the influence of microstructure on the mechanical behavior of alumina, and most of them were focused on the effects of grain size [10][11][12][13][14][15][16][17] . A fine-grained microstructure 3,10,11 and narrow range of particle size distribution often result in an improvement of the mechanical behavior of alumina 10,11 .…”

Section: Introductionmentioning

confidence: 99%

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Effect of LZSA Glass-Ceramic Addition on Pressureless Sintered Alumina. Part II: Mechanical Behavior

et al. 2017

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This work aims to evaluate the influence of a Li 2 O-ZrO 2 -SiO 2 -Al 2 O 3 (LZSA) glass-ceramic on the mechanical behavior of alumina. Composites were prepared from alumina with three different particle sizes and 7 to 21 vol% of an LZSA glass-ceramic composition (11.6Li 2 O-16.8ZrO 2 -68.2SiO 2 -3.4Al 2 O 3 ,). Specimens were obtained by uniaxial pressing. The optimum sintering temperature and holding time were found to be different for each composite. Structural characterization (bulk density and crystalline phases); mechanical characterization (flexure strength, elastic modulus, fracture toughness, and fracture energy); and microstructural analyses were carried out. Fine-grained alumina-based composite containing 21 vol% of glass-ceramic (1470 ºC and 3 h holding time, 2.0% porosity) showed a fracture toughness of 4.93 MPa·m 0.5 , an elastic modulus of 210 GPa, a fracture energy of 57 J·m -2 , and a flexural strength of 170 MPa, in very good agreement with values reported by the literature. An increase of 37-177% in the fracture energy due to 21 vol% LZSA addition in the alumina was achieved for the range of grain size obtained in this work. Even though the final composition included a glassy component, the observed mechanical properties confirmed the effectiveness of the crystalline phases that were formed from LZSA glass-ceramic in reducing the propagation of cracks. The results showed that the addition of the LZSA glass-ceramic improved the mechanical properties of alumina.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of LZSA Glass-Ceramic Addition on Pressureless Sintered Alumina. Part II: Mechanical Behavior

et al. 2017

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“…However, the suppression of grain growth also plays a crucial role. For example, the grain size has been considered as the main microstructural aspect related to the mechanical properties of alumina 11,12 . In this sense, two-step sintering has been successfully used to obtain dense alumina at low temperatures while suppressing grain growth at the end of sintering 13,14 .…”

Section: Introductionmentioning

confidence: 99%

Effect of LZSA Glass-Ceramic Addition on Pressureless Sintered Alumina. Part I: Grain Growth

et al. 2017

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The aim of this study was to evaluate the effect of an 11.6Li 2 O-16.8ZrO 2 -68.2SiO 2 -3.4Al 2 O 3 (LZSA) glass ceramic on the grain growth of alumina obtained by pressureless sintering. Three contents of the LZSA glass ceramic (7, 15, and 21 vol%; mean particle size of 1.52 µm) and three types of alumina (mean particle sizes of 0.5, 1.7, and 2.8 µm) were used. The powder compositions were formed by cold pressing. The samples (5 mm × 5 mm × 13 mm) were sintered in an optical dilatometer. The grain size and morphology were evaluated by scanning electron microscopy. The results show that elongated alumina particles were obtained for the investigated composites compared with pure alumina because of the LZSA addition. The grain growth of alumina was less pronounced at higher LZSA contents. High relative densities were obtained for higher LZSA contents at lower temperatures and holding times compared with pure alumina.

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“…Th e sophisticated industry and technology [5][6][7] require higher and higher assumption against to mechanical properties, such as hardness [8][9][10][11][12][13], strength [14][15][16][17][18][19][20], wear resistance [21][22][23][24], toughness [25,26] and dynamic strength [27][28][29]. Till today several types of ceramic materials and ceramic matrix composites (CMC) are develop with excellent mechanical properties, with high values of mechanical strength and hardness, but most of these materials have microstructures with relatively large crystals, having high rigidness and strong inclination to nick, pitting and rigid fractures.…”

Section: Introductionmentioning

confidence: 99%

Mechanical stress relaxation in hetero-modulus, hetero-viscous complex ceramic materials

Gömze¹,

Gömze²

2010

Epitoanyag-JSBCM

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Hetero-modulus, hetero-viscous complex materials have several advantages in accordance to mechanical and thermal properties comparing with the traditional ceramics and ceramic matrix composites. In this paper the authors examined in details the high speed collision processes between flying metallic objects and ceramics, such as α-Si 3 N 4 , β-Si 3 N 4 , Si 2 ON 2 , SiAlON, AlN and 3Al 2 O 3 2SiO 2 reinforced alumina matrix hybrid materials, as well as their rheo-mechanical structures and properties. Understanding the high speed collision process, material structures, rheological properties of such a complex hybrid material, the authors in this paper mathematically describe the mechanical shear stress and its relaxation during and after high speed collisions in α-Si 3 N 4 , β-Si 3 N 4 , Si 2 ON 2 , SiAlON, AlN and 3Al 2 O 3 2SiO 2 reinforced alumina matrix composites. The dynamic strength of the developed and examined corundum matrix complex materials was tested through collision with high density metallic flying bodies, with speed higher than 900 m/sec and described in works [27,29,42]. Analytical methods applied in this research were scanning electron microscopy, X-ray diffraction and energy dispersive spectrometry. Digital image analysis was applied to microscopy results, to enhance the results of transformation.

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Improved sliding wear-resistance of alumina with sub-micron grain size: A comparison with coarser grained material

Cited by 52 publications

References 26 publications

Effect of LZSA Glass-Ceramic Addition on Pressureless Sintered Alumina. Part II: Mechanical Behavior

Effect of LZSA Glass-Ceramic Addition on Pressureless Sintered Alumina. Part II: Mechanical Behavior

Effect of LZSA Glass-Ceramic Addition on Pressureless Sintered Alumina. Part I: Grain Growth

Mechanical stress relaxation in hetero-modulus, hetero-viscous complex ceramic materials

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