Preparation and performance of ultrafine grained WC-10Co alloys with added La2O3

Li, Jianfeng; Cheng, Jigui; Wei, Bangzheng; Chen, Pengqi

doi:10.1016/j.ceramint.2018.11.071

Cited by 41 publications

(11 citation statements)

References 23 publications

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“…Thus, the fracture toughness of the alloy is improved 38 . Li et al 33 . investigated the microstructure and mechanical properties of the WC–10Co alloy with different La 2 O 3 contents.…”

Section: Resultsmentioning

confidence: 99%

“…Thus, the fracture toughness of the alloy is improved. 38 Li et al 33 investigated the microstructure and mechanical properties of the WC-10Co alloy with different La 2 O 3 contents. When the La 2 O 3 content was .8 wt%, the grain refinement effect was the best, with the average grain size of WC of about 275 nm.…”

Section: Density and Mechanical Propertiesmentioning

confidence: 99%

“…Dong et al 32 found that the properties of WC-α-Al 2 O 3 could be strengthened by an appropriate addition of Y 2 O 3 or CeO 2 as an inhibitor, because the addition of rare earth elements reduced the surface activation energy in sintering process and increased the degree of densification of the material. Li et al 33 prepared ultrafine grained WC-10Co alloys with the addition of La 2 O 3 and found when the La 2 O 3 content is .8 wt%, the Rockwell hardness and fracture toughness of the alloy reached 91.8 HRA and 13.44 MPa m 1/2 , respectively.…”

Section: Introductionmentioning

confidence: 99%

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Effects of oxide addition on structure and properties of WC–10Co cemented carbide obtained by in situ synthesized powder

Deng

Wang

Zhang

2022

Int J Applied Ceramic Tech

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Combining spray drying and in situ synthesized technology, WC–10Co cemented carbide with uniform composition was prepared by vacuum sintering. The effects of Al2O3 and additions of different rare‐earth oxides (La2O3, Y2O3 and CeO2) on the microstructure and mechanical properties of WC–10Co were investigated. As the Al2O3 content increased from .5 to 2 wt%, the hardness of the sintered sample increased, whereas the relative density and fracture toughness decreased. Compared with the addition of .5 wt% Al2O3, the WC–10Co alloy with .5 wt% rare‐earth oxides had higher hardness. In addition, compared with the alloy without an inhibitor (.80 μm), after adding .5 wt% Al2O3, La2O3, Y2O3 and CeO2, the WC grain sizes were reduced to .73, .65, .71 and .62 μm, respectively, which indicated that the addition of Al2O3 and rare‐earth oxides could refine WC grain during sintering. Among these additives, CeO2 had the best effect. With the addition of .5 wt% CeO2, the hardness and the fracture toughness increased from 1299 to 1710 HV30 and from 16.18 to 18.90 MPa m1/2, respectively.

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“…Thus, the fracture toughness of the alloy is improved 38 . Li et al 33 . investigated the microstructure and mechanical properties of the WC–10Co alloy with different La 2 O 3 contents.…”

Section: Resultsmentioning

confidence: 99%

Section: Density and Mechanical Propertiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effects of oxide addition on structure and properties of WC–10Co cemented carbide obtained by in situ synthesized powder

Deng

Wang

Zhang

2022

Int J Applied Ceramic Tech

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“…The main characteristics of the WC-Co-NbC-TaC, Y 2 O 3 and Ni powders are given in Table 1. [30] investigated the effect of mixing different amounts of La2O3 with WC-10%Co and then conducted the consolidation using microwave sintering. They reported that the addition of an appropriate amount of La2O3 can suppress WC grain growth and narrow the grain size distribution.…”

Section: Experimental Work 21 Materialsmentioning

confidence: 99%

“…Yang et al [29] prepared WC-8 Co composite powders doped with Y 2 O 3 by the wet chemical method and conducted the consolidation using by SPS at 1200 • C, 1250 • C and 1300 • C. They reported that the comprehensive performance of WC-8%Co cemented carbide doped with Y 2 O 3 was best at the sintering temperature of 1250 • C, with a hardness of 19.64 GPa and a fracture toughness of 11.97 MPa m 1/2 . Li et al [30] investigated the effect of mixing different amounts of La 2 O 3 with WC-10%Co and then conducted the consolidation using microwave sintering. They reported that the addition of an appropriate amount of La 2 O 3 can suppress WC grain growth and narrow the grain size distribution.…”

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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Tungsten Carbides

Shabalin

2022

Ultra-High Temperature Materials IV

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Preparation and performance of ultrafine grained WC-10Co alloys with added La2O3

Cited by 41 publications

References 23 publications

Effects of oxide addition on structure and properties of WC–10Co cemented carbide obtained by in situ synthesized powder

Effects of oxide addition on structure and properties of WC–10Co cemented carbide obtained by in situ synthesized powder

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

Tungsten Carbides

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