Fabrication and mechanical properties of α-Al2O3 whisker reinforced cu-graphite matrix composites

Tan, Wenyue; Jiang, Xiaosong; Shao, Zhang; Sun, Huilan; Song, Tingfeng; Luo, Zhiping

doi:10.1016/j.powtec.2020.07.105

Cited by 31 publications

(4 citation statements)

References 31 publications

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“…Graphite addition in copper matrix causes a substantial improvement in tribological performance of copper. The copper graphite composites can be prepared by numerous fabrication techniques [10][11][12]. Many researchers have used powder metallurgy techniques to form these composites.…”

Section: Introductionmentioning

confidence: 99%

“…Varol et al [10] used flake PM to fabricate Cu nanocomposite using nano graphite, carbon nanotubes and graphene nanosheets and compared effect of content of each reinforcement relative to each other for hardness, density and electrical conductivity. Madavali et al [11] investigated the changes in copper powders with varying milling time and different milling atmosphere and concluded that at initial stage of milling the powder morphology transformed from spherical to flat due to simultaneous deformation of powders and cold welding between them [14]. Kai et al [12] compared the conventional PM and Flake PM to form B 4 C/Al composite and showed in case of Flake PM B 4 C particles were uniformly distributed in milled powders and in final composite along with improvement in mechanical properties and also a decrease in defects like cracks and pores in the composite formed is seen [15].…”

Section: Introductionmentioning

confidence: 99%

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Correlating topographical characteristics of relaxed layer to tribology in Cu-Gr-TiC composite system

Ankit¹,

Gautam²,

Singh³

et al. 2023

Surf. Topogr.: Metrol. Prop.

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The copper graphite composites are often being applied as bearing materials in various industries. In present investigation, the correlation between the topographical characteristics of relaxed layer to tribology in Cu-Gr-TiC composite system has been investigated. For this purpose, the flake powder metallurgy approach was used to fabricate Cu-Gr-TiC composites and the tribology of these composites was studied under lubricating (synthetic SAE20W40 motor oil) condition. Variable loads of 10 N-70 N, sliding velocities were 0.75 m/s-3 m/s, and sliding distances of 2000 m-8000 m were the test parameters for sliding wear of composites under lubricating conditions. The worn surfaces were examined using SEM and EDS while topographical parameters were studied by AFM. The other properties like mechanical and physical properties were also studied for the sintered samples to better correlate the overall results of surface topography and tribology. The tests depict the successful fabrication of the composites. The composite having 4.5wt.% TiC particles exhibit maximum hardness and least wear and CoF under lubricating environment. The results of a sliding wear test conducted under lubrications revealed that rise in the concentration of nano TiC particles in the matrix improves the composite's tribological performance. The mechanism of wear for pure copper sample is abrasion whereas for TiC particle reinforced composite is smooth ploughing and delamination. The surface topographical parameters that are average surface roughness, area peak to valley height and skewness depicted less roughness values and better load bearing capacity for 4.5wt% TiC reinforced Cu-Gr sample.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Correlating topographical characteristics of relaxed layer to tribology in Cu-Gr-TiC composite system

Ankit¹,

Gautam²,

Singh³

et al. 2023

Surf. Topogr.: Metrol. Prop.

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“…Although Al2O3 is highly biocompatible and wear-resistant, it possesses low flexural strength and toughness (Marti, 2000). In order to enhance its mechanical properties, two composite materials have been developed by incorporating a second phase (Jang et al, 1995;Öksüz and Özer, 2017) or embedding whisker (Tan et al, 2020) into an Al2O3 matrix.…”

Section: Introductionmentioning

confidence: 99%

Sert Doku Uygulamaları İçin Makro Gözenekli Alüminyum Oksit-Bor Karbür Seramikleri

ÖKSÜZ

2023

Recep Tayyip Erdoğan Üniversitesi Fen Ve Mühendislik Bilimleri Dergisi

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Bu çalışma, dünya çapında yaygın bir klinik problem olan sert doku defektlerinin tedavisi için yüksek kaliteli biyoseramik köpüklerin geliştirilmesine odaklanmaktadır. Bu deneysel çalışmada, biyomedikal alanlarda kullanılması hedeflenen karbür (B4C) ilaveli α-alüminyum oksit (Al2O3) seramikler replika yöntemi ile yüksek gözenekli olarak üretilmiş ve karakterize edilmiştir. Ekonomik polimer model malzeme olarak kullanılan açık gözenekli, 30 ppi gözenek boyutunda poliüretan süngerlerin termogravimetrik (TGA) ve diferansiyel termal analizleri (DTA) ile termal özelikleri belirlenmiştir. Yüksek sıcaklıkta sinterlenerek elde edilen, farklı B4C oranları içeren Al2O3 esaslı seramik köpükler homojen, yüksek gözenekli ve birleştirici gözenek mikroyapısında olduğu yüksek alan emisyon tabancalı taramalı elektron mikroskobu (FEG-SEM) ile detaylı olarak incelenmiştir. X-ışınları (XRD) analizleri ile B4C’nin yapı içerisinde varlığı ve faz değişimleri doğrulanmıştır. Yapısında ağırlıkça % 0, % 3 ve % 5 B4C içeren sinterlenmiş seramik köpüklerin basma mukavemeti değerleri sırasıyla 1,92 MPa, 2,05 MPa ve 2,38 Mpa olarak ölçülmüştür. Canlı ortamlarda kullanılacak biyomalzemelerin oluşturacağı biyolojik cevabın önceden değerlendirilmesi amacıyla yapılan in vitro testlerde tatmin edici sonuçlar elde edilmiştir. Hücre canlılığı deneyleri, Al2O3 esaslı seramik köpüklere B4C ilavesinin sert doku defektlerinde önemli bir avantaj olan hücre proliferasyonunu desteklediğini göstermiştir.

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“…During the intermediate and final stages, the microstructure is represented as channel-like interconnected porosity along the grain boundaries towards isolated pores and closed porosity. In addition, the mechanisms that contribute to densification in the intermediate and final stages of the sintering process are grain boundary diffusion and volume diffusion: diffusion is from the grain boundary to the pore surface (Figure3mass transport mechanism number 3 and 4b, respectively) (MUNIR;ANSELMI-TAMBURINI;OHYANAGI, 2006;SONG; ZHANG, 2006; GRAPHENE et al., 2009).…”

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confidence: 99%

Caracterizações microestrutural, mecânica e tribológica do cobre e compósitos de cobre-Al2O3 obtidos por spark plasma sintering.

Castillo¹

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Fabrication and mechanical properties of α-Al2O3 whisker reinforced cu-graphite matrix composites

Cited by 31 publications

References 31 publications

Correlating topographical characteristics of relaxed layer to tribology in Cu-Gr-TiC composite system

Correlating topographical characteristics of relaxed layer to tribology in Cu-Gr-TiC composite system

Sert Doku Uygulamaları İçin Makro Gözenekli Alüminyum Oksit-Bor Karbür Seramikleri

Caracterizações microestrutural, mecânica e tribológica do cobre e compósitos de cobre-Al2O3 obtidos por spark plasma sintering.

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