A novel core‐shell structured ultra‐coarse <scp>WC</scp>‐Co composite powders prepared by fluidized bed chemical vapor deposition

Zhang, Lei; Xin, Fengxia; Du, Zhan; Xiang, Maoqiao; Yang, Yafeng; Zhu, Qingshan

doi:10.1111/jace.16076

Cited by 11 publications

(11 citation statements)

References 25 publications

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“…The temperature had a significant influence on the cohesion force. When the FBCVD temperature is higher than Tammann temperature, the particles will be easily agglomerated together . The deposition temperatures in the present study were all higher than the Tammann temperature of Ni (590°C) .…”

Section: Discussionmentioning

confidence: 54%

“…Regarding to the fluidization process of particles, most of the defluidization was caused by the particle agglomeration . The adhesion of particles during the FBCVD process was controlled by the cohesion force and collision force . When the cohesion force is bigger than the collision one, the particles will adhere together to form big agglomerates and the defluidization will occur.…”

Section: Discussionmentioning

confidence: 99%

“…Alternatively, fluidized bed chemical vapor deposition (FBCVD) is an economic approach to make core‐shell powder, which exposes each flowing WC particle into the gaseous reactive precursors to form a deposition layer on its surface without any pretreatment like coarsening, sensitization, and activation . This has been successfully used to coat Ni on SiC and Al 2 O 3 particles and Co on WC particles with excellent uniformity . However, with the increasing amount of metal particles deposited on the ceramic particles, they could stick together to cause defluidization .…”

Section: Introductionmentioning

confidence: 99%

“…This has been successfully used to coat Ni on SiC and Al 2 O 3 particles and Co on WC particles with excellent uniformity . However, with the increasing amount of metal particles deposited on the ceramic particles, they could stick together to cause defluidization . Accordingly, the deposition would be terminated.…”

Section: Introductionmentioning

confidence: 99%

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Enabling the low‐cost preparation of core‐shell WC–Ni powder by developing a non‐noble metal‐based catalytic

Zhang

Xin

et al. 2019

J Am Ceram Soc

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A novel method of incorporating fluidized bed chemical vapor deposition (FBCVD) with electroless plating was developed to effectively prepare the core‐shell structured high‐Ni‐content WC–Ni composite powders. FBCVD offered a unique approach to decorating Ni particles on WC particles. The small Ni particle acted as an active catalyst to effectively produce high‐Ni‐content composite powders in the subsequent electroless plating process. The particle size and quantity of decorated Ni particle determined the electroless plating rate. FBCVD pretreatment temperature and time had a conflicting influence on obtaining both the fine size and large quantity of deposited Ni particles. For the conditions tested, the maximum electroless plating rate of 2.93 mg/g/min was obtained using an optimal FBCVD pretreatment at 750°C for 5 minutes, corresponding to a 0.11 wt. % Ni deposition and 50 nm particle size.

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Section: Discussionmentioning

confidence: 54%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Enabling the low‐cost preparation of core‐shell WC–Ni powder by developing a non‐noble metal‐based catalytic

Zhang

Xin

et al. 2019

J Am Ceram Soc

Self Cite

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“…The parameters of the fluidized bed reactor and the experimental procedure of the deposition process were described in the literature 17 . The only difference was the deposition time (range from 1‐7 minutes) and the gas flow rate of the process of FBCVD.…”

Section: Methodsmentioning

confidence: 99%

Utilizing the autocatalysis of Co to prepare low‐cost WC‐Co powder for high‐performance atmospheric plasma spraying

Zhang

Yue

et al. 2020

J Am Ceram Soc

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A novel method of incorporating fluidized bed chemical vapor deposition (FBCVD) with electroless plating was developed to effectively prepare the core-shell structured WC-Co composite powders. The Co nanoparticles decorated on the surface of WC particles by FBCVD acted as active catalysts for the subsequent electroless plating process. The particle size and quantity of the decorated Co particles determined the electroless plating rate but the particle size played more important role. For the conditions tested, the maximum electroless plating rate of 2.34 mg/g/min was obtained by using an optimal FBCVD pretreatment at 750°C for 3 minutes. WC-12Co composite powders with a commercial composition widely used for atmospheric plasma spraying (APS) were efficiently prepared. The composite powders exhibited excellent suitability for APS by forming a homogenous CoW -C ternary liquid stream. The APS coating is not only well-bonded with the substrate but also consisted of hard nonequilibrium Co 3 W 3 C and W 2 C phases with a uniform distribution. Both remarkably improved the hardness and tribological properties of the APS coating.

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Fluidization and Application of Carbon Nano Agglomerations

Chen,

Jiang,

Zhu

et al. 2023

Advanced Science

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Carbon nanomaterials are unique with excellent functionality and diverse structures. However, agglomerated structures are commonly formed because of small‐size effects and surface effects. Their hierarchical assembly into micro particles enables carbon nanomaterials to break the boundaries of classical Geldart particle classification before stable fluidization under gas‐solid interactions. Currently, there are few systematic reports regarding the structural evolution and fluidization mechanism of carbon nano agglomerations. Based on existing research on carbon nanomaterials, this article reviews the fluidized structure control and fluidization principles of prototypical carbon nanotubes (CNTs) as well as their nanocomposites. The controlled agglomerate fluidization technology leads to the successful mass production of agglomerated and aligned CNTs. In addition, the self‐similar agglomeration of individual ultralong CNTs and nanocomposites with silicon as model systems further exemplify the important role of surface structure and particle‐fluid interactions. These emerging nano agglomerations have endowed classical fluidization technology with more innovations in advanced applications like energy storage, biomedical, and electronics. This review aims to provide insights into the connections between fluidization and carbon nanomaterials by highlighting their hierarchical structural evolution and the principle of agglomerated fluidization, expecting to showcase the vitality and connotation of fluidization science and technology in the new era.

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A novel core‐shell structured ultra‐coarse WC‐Co composite powders prepared by fluidized bed chemical vapor deposition

Cited by 11 publications

References 25 publications

Enabling the low‐cost preparation of core‐shell WC–Ni powder by developing a non‐noble metal‐based catalytic

Enabling the low‐cost preparation of core‐shell WC–Ni powder by developing a non‐noble metal‐based catalytic

Utilizing the autocatalysis of Co to prepare low‐cost WC‐Co powder for high‐performance atmospheric plasma spraying

Fluidization and Application of Carbon Nano Agglomerations

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