In situ synthesis of WC–Co nanocomposite powder via core–shell structure formation

Lin, Hua; Tao, Bowan; Li, Qing; Li, Yanrong

doi:10.1016/j.materresbull.2012.07.038

Cited by 19 publications

(7 citation statements)

References 24 publications

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“…In order to address the homogeneity issue, a new type of Co‐coated WC composite powder with a core‐shell structure has been developed in the past few years 12‐16 . The traditional approach to making the core‐shell structured composite powder is electroless plating 14‐15 .…”

Section: Introductionmentioning

confidence: 99%

“…In order to address the homogeneity issue, a new type of Co-coated WC composite powder with a core-shell structure has been developed in the past few years. [12][13][14][15][16] The traditional approach to making the core-shell structured composite powder is electroless plating. [14][15] It was based on the autocatalytic reduction of metallic salt on the target surface to produce metal layers with uniform thickness.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

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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“…In order to resolve this issue, some researchers have attempted to make a core‐shell structured powder, i.e., the Co coated WC composite powder in the past few years . This type of powder keeps the original size of WC particles and has an excellent uniformity of Co. By sintering such a powder, the microstructure homogeneity and mechanical properties have been improved significantly .…”

Section: Introductionmentioning

confidence: 99%

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

Zhang

Xin

et al. 2018

J Am Ceram Soc

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The ultra‐coarse WC‐Co composite powders with a core‐shell structure were effectively prepared by fluidized bed chemical vapor deposition (FBCVD) using CoCl2 precursor. An excellent interfacial bonding was formed between WC and the deposited Co. Defluidization was the major barrier to depositing high‐Co‐content composite powders, which was caused by the adhesion of the deposited Co particles. Decreasing the deposition temperature reduced the cohesion force of the deposited Co particles, which was thus beneficial to preventing the defluidization. Increasing the WC particle size and the gas velocity increased the collision force and benefited the fluidization. The final Co contents were largely dependent on the deposition and fluidization behaviors. For the conditions tested, the optimal deposition temperature was 800°C while the minimum WC particle size suitable for FBCVD was 25 μm.

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“…In our previous work, a series of WC, WC-Co, and WC-Co-VC nano-sized powders was prepared using a core-shell structure precursor [11][12][13]. The precursor was synthesized using hydrothermal method, which adopts organics as carbon sources.…”

Section: Introductionmentioning

confidence: 99%

Application of Organic Carbon Sources in Preparing a Core-shell Structure

Zhou¹,

Lin²,

Qin³

et al. 2015

Proceedings of the 2nd International Conference on Green Materials and Environmental Engineering

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To synthesize a core-shell structure for preparing nano-sized WC powder, four kinds of organics were adopted as carbon sources and their carbonization characteristics were investigated. The results showed that organic type severely affected the structure and quality of the product. Using starch as carbon source, the carbonization with tungsten source were tightly contacted and formed a typical core-shell structure with a core that was 20-40 nm and a shell that was 10-20 nm in size. The formatting mechanism of the core-shell structure was also explored.

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In situ synthesis of WC–Co nanocomposite powder via core–shell structure formation

Cited by 19 publications

References 24 publications

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

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

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

Application of Organic Carbon Sources in Preparing a Core-shell Structure

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