Tribological properties of nanostructured and conventional WC–Co coatings deposited by plasma spraying

Zhu, Yingchun; Yukimura, Ken; Ding, Chuanxian; Zhang, Pingyu

doi:10.1016/s0040-6090(01)00805-7

Cited by 177 publications

(97 citation statements)

References 31 publications

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“…The nanoscale microstructure can be retained in the coatings despite the high temperatures and melting involved in forming a dense coating. Plasma spraying [393][394][395][396][397][398][399] and HVOF spraying [400][401][402][403] of nanostructured feedstock powders of metals or ceramics proved to be potential methods to form nanocrystalline coatings. The HVOF method is preferred to plasma spraying because of its higher droplet velocity and lower thermal energy levels, yielding denser structure, and higher bond strength between the coating and the substrate.…”

Section: Thermal Sprayed Coatingsmentioning

confidence: 99%

Nanocrystalline materials and coatings

Tjong

Chen

2004

Materials Science and Engineering: R: Reports

832

345

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In recent years, near-nano (submicron) and nanostructured materials have attracted increasingly more attention from the materials community. Nanocrystalline materials are characterized by a microstructural length or grain size of up to about 100 nm. Materials having grain size of $0.1 to 0.3 mm are classified as submicron materials. Nanocrystalline materials exhibit various shapes or forms, and possess unique chemical, physical or mechanical properties. When the grain size is below a critical value ($10-20 nm), more than 50 vol.% of atoms is associated with grain boundaries or interfacial boundaries. In this respect, dislocation pile-ups cannot form, and the Hall-Petch relationship for conventional coarse-grained materials is no longer valid. Therefore, grain boundaries play a major role in the deformation of nanocrystalline materials. Nanocrystalline materials exhibit creep and super plasticity at lower temperatures than conventional micro-grained counterparts. Similarly, plastic deformation of nanocrystalline coatings is considered to be associated with grain boundary sliding assisted by grain boundary diffusion or rotation. In this review paper, current developments in fabrication, microstructure, physical and mechanical properties of nanocrystalline materials and coatings will be addressed. Particular attention is paid to the properties of transition metal nitride nanocrystalline films formed by ion beam assisted deposition process. #

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Section: Thermal Sprayed Coatingsmentioning

confidence: 99%

Nanocrystalline materials and coatings

Tjong

Chen

2004

Materials Science and Engineering: R: Reports

832

345

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“…From the data it is affirm that the clay understudy mainly belong to smectite group of clay with general formula of C 0. 5 4 .…”

Section: Resultsmentioning

confidence: 99%

“…There is a tremendous interest in research on nanostructure materials in recent years due to their superior sportive, chemical, thermal and mechanical properties [1][2][3][4][5][6] . Nanostructure materials are enjoying popularity in catalyst preparations.…”

Section: Introductionmentioning

confidence: 99%

Influence of Some Intercalations on Activation of Pre-Baked Clay

Ahmad

Ullah

2009

J. Chil. Chem. Soc.

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We report on the influence of temperature, mixing ratio and holding time of NaOH & KOH intercalations on the surface area, micropore volume and micropore width of pre-baked clay samples. Pore size & surface area analyzer was used to measure the surface area, micropore volume and average pore width using Dubinin-Radushkevich (DR) method. A meaning full effect was observed when the temperature was increased from ambient up to 150 o C in case of both intercalating agents. Increasing temperature beyond 150 o C caused a decline in surface area generation even up to 750 o C. The results also show that mixing ratio has a positive effect on the porosity and the micropore surface area increases as the mixing ratio increases in case of both intercalating agents. The influence of holding time shows two different trends. In case of NaOH, the porosity increases as the time increases while in case of KOH, the porosity decreases as the time increases. SEM, EDX and XRD studies were also performed. The results show effective insertion of the sodium and potassium into the clay matrix thereby causing generation of porosity.

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“…For example, plasma spraying has been investigated by several researchers to deposit nanostructured ceramic coatings such as WC, Cr 3 C 2 , Al 2 O 3 -TiO 2 , and ZrO 2 . [1][2][3][4][5][6] However, the use of plasma spraying to fabricate a bulk, freestanding nanostructured Al 2 O 3 component has rarely been reported in the literature. In this study, freestanding, net-shape nanostructured Al 2 O 3 structures were fabricated using plasma-spray forming.…”

Section: Introductionmentioning

confidence: 99%