Preparing nano-crystalline rare earth doped WC/Co powder by high energy ball milling

Liu, Sha; Huang, Zelan; Liu, Gang; Yang, Gui-bin

doi:10.1016/j.ijrmhm.2005.10.001

Cited by 53 publications

(13 citation statements)

References 4 publications

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“…The obtained alloys were compared with those developed via liquid phase sintering and it was found that denser and harder alloys resulted from MA process compared to liquid processing. the addition of a rare earth was beneficial in reducing crystallite size further (after Liu et al [34]).…”

Section: Synthesis Of Cemented Carbides Using Mechanical Alloyingmentioning

confidence: 99%

“…Replacing VC by Cr 3 C 2 induced further improvement in hardness but with no enhancement in grain growth reduction. As for the role of adding different impurities to the WC-Co mixture to obtain a nanocrystalline hardmetals, it was investigated elsewhere [34] and found that small addition of rare earth oxides (1.5 wt.% of Y 2 O 3 -La 2 O 3 -CeO 2 ) was effective in refining the grain size of WC/Co powder by two times following MA for 25 hrs compared to the undoped alloys…”

Section: Synthesis Of Cemented Carbides Using Mechanical Alloyingmentioning

confidence: 99%

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The Synthesis of Nanostructured WC‐Based Hardmetals Using Mechanical Alloying and Their Direct Consolidation

Al-Aqeeli

Saheb

Laoui

et al. 2014

Journal of Nanomaterials

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Tungsten carbide- (WC-) based hardmetals or cemented carbides represent an important class of materials used in a wide range of industrial applications which primarily include cutting/drilling tools and wear resistant components. The introduction and processing of nanostructured WC-based cemented carbides and their subsequent consolidation to produce dense components have been the subject of several investigations. One of the attractive means of producing this class of materials is by mechanical alloying technique. However, one of the challenging issues in obtaining the right end-product is the possible loss of the nanocrystallite sizes due to the undesirable grain growth during powder sintering step. Many research groups have engaged in multiple projects aiming at exploring the right path of consolidating the nanostructured WC-based powders without substantially loosing the attained nanostructure. The present paper highlights some key issues related to powder synthesis and sintering of WC-based nanostructured materials using mechanical alloying. The path of directly consolidating the powders using nonconventional consolidation techniques will be addressed and some light will be shed on the advantageous use of such techniques. Cobalt-bonded hardmetals will be principally covered in this work along with an additional exposure of the use of other binders in the WC-based hardmetals.

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Section: Synthesis Of Cemented Carbides Using Mechanical Alloyingmentioning

confidence: 99%

Section: Synthesis Of Cemented Carbides Using Mechanical Alloyingmentioning

confidence: 99%

The Synthesis of Nanostructured WC‐Based Hardmetals Using Mechanical Alloying and Their Direct Consolidation

Al-Aqeeli

Saheb

Laoui

et al. 2014

Journal of Nanomaterials

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“…The rare-earth doped cemented carbides have being investigated and developed for mass production. Many researches [7][8][9] on doped compositions and contents, addition approaches, processing scheme, strengthening mechanism, microstructure and mechanical properties of rare-earth doped cemented carbides have been done according to the processing techniques. The current trends on strengthening mechanisms of rare-earth doped cemented carbides could be that the solid solution contents of (W,Ti)C or WC in Co binder are slightly increased, and the addition of rare-earth can increase the contents of α-Co binder with fcc structure, and the addition of rare-earth could slightly decrease the grain sizes of WC/Co alloys.…”

Section: Rare Earth Elementsmentioning

confidence: 99%

Grain growth inhibitors in cemented carbide application

Jiang¹,

Zhu²

2015

Proceedings of the 2015 2nd International Workshop on Materials Engineering and Computer Sciences

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The crystal grain of the cemented carbides can occurs in the process of sinteing of cemented carbides. Relational researches prove that appended inhibitors can prevent the growing of crystals in cemented carbides effectively. In recent years, appended Inhibitors in cemented carbides are studied at home and abroad. The inhibiting mechanism of the crystal grain growth inhibitor in cemented carbides and their methods to dope, and influencing factor on the inhibitory effect of the crystal grain growth inhibitor were summarized in this paper. Meanwhile, Transited metal carbides , Rare earth, Sulfur and Phosphorus, Copper and Molybdenum which were used crystal grain growth inhibitors and their effect on the prosperities of the alloy are introduced .Finally introduced the crystal growth inhibitor compound increase, the new the preparation , the new development of inhibitor.

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“…The most successful method to control the WC grain growth is the addition of less than 1 wt% of inhibitors, such as TaC, ZrC, VC, Cr 3 C 2 , NbC, Y 2 O 3 or TiC, to WC-Co powder mixtures. This is useful for protection from any oxidation [7,[14][15][16], inhibits heterogeneous grain growth and increases the hardness [16,17].…”

Section: Introductionmentioning

confidence: 99%

“…It has been reported that the addition of small amounts of REE element oxides to WC-Co enhances the wettability of Co and WC, refines the grains, controls the uneven grain growth and allows the formation of η phase in the cemented carbides [26]. Furthermore, the addition of 1.5 wt% REE oxides (Y 2 O 3 , La 2 O 3 -CeO 2 ) to WC-10%Co cemented carbides produced a much finer grain size and better mechanical properties [16]. The addition of Y 2 O 3 and NbC to WC-Co alloys improves the hardness and fracture toughness of the ultrafine WC-Co alloys [7].…”

Section: Introductionmentioning

confidence: 99%

The Development of WC-Based Composite Tools for Friction Stir Welding of High-Softening-Temperature Materials

Ahmed

Barakat

Mohamed

et al. 2021

Metals

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This work presents a detailed investigation for the effect of Y2O3 and Ni additions on the densification behavior, microstructural evolution and mechanical properties of a WC-Co-TaC-NbC composite. With the aim of obtaining WC-based composites with improved fracture toughness, to be used in severe conditions of high-temperature deformation, different concentrations of Y2O3 were incorporated with and without 5 wt% Ni addition. The consolidated composites were characterized using density measurement, XRD, SEM, hardness, fracture toughness, transverse rupture strength and compression testing. Fully dense composites were obtained through the applied consolidation regime of cold compaction and sintering at 1450 °C for 1.5 h under vacuum with a relative density up to 97%. The addition of 2.5 wt% Y2O3 to the base WC composite increased the relative density and then slightly decreased with the increase of the Y2O3 content. The addition of 5 wt% Ni to the base composites significantly increased the relative density to 97%. The XRD results indicated the existence of the Co3W3C η-phase after sintering, and the intensity of its peaks was reduced with the addition of 5 wt% Ni. The microstructure of the consolidated composites consisted of three phases: WC, Co3W3C and Y2O3. The area fraction of the Y2O3 phase increased as its weight fraction increased. In terms of the fracture toughness, the transverse-rupture strength (TRS) and the compressive strength were significantly improved by the addition of 5 wt% Ni with the 2.5 wt% Y2O3. Accordingly, this composition was used to manufacture the tools for the friction stir welding of the high-softening-temperature materials, which was successfully used for 25 plunges and about 500 cm of butt joints in nickel-based and carbon–steel alloys.

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Preparing nano-crystalline rare earth doped WC/Co powder by high energy ball milling

Cited by 53 publications

References 4 publications

The Synthesis of Nanostructured WC‐Based Hardmetals Using Mechanical Alloying and Their Direct Consolidation

The Synthesis of Nanostructured WC‐Based Hardmetals Using Mechanical Alloying and Their Direct Consolidation

Grain growth inhibitors in cemented carbide application

The Development of WC-Based Composite Tools for Friction Stir Welding of High-Softening-Temperature Materials

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