Effects of micro/nano CeO2 on the microstructure and properties of WC-10Co cemented carbides

Cai, Huang; Jing, Wenwen; Guo, Shengda; Liu, Lei; Ye, Ying; Yan, Weiping; Wu, Yunxuan; Wang, Shuilong; Huang, Xing; Zhang, Jianbo

doi:10.1016/j.ijrmhm.2020.105432

Cited by 27 publications

(19 citation statements)

References 40 publications

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“…The diffraction peak of Co of samples 5 and 7 are also shifted slightly. It indicates that additions of Al 2 O 3 , La 2 O 3 and CeO 2 can inhibit the transformation from fcc‐Co to hcp‐Co, which is consistent with the previous study 30,38 …”

Section: Resultssupporting

confidence: 92%

“…Besides, W or W 2 C phase could react with C to form WC at 1100°C 35 . There are no diffraction peaks of Al 2 O 3 , La 2 O 3 , Y 2 O 3 and CeO 2 in XRD patterns of the samples because of the detection limit of XRD analysis 30 . The expanded XRD patterns in the 2 θ range of 43.5°–45° were shown on the right side of Figure 3B.…”

Section: Resultsmentioning

confidence: 98%

“…Furthermore, compared with alloy 1 (.80 μm), the grain size of WC in alloy 5 (.65 μm), alloy 6 (.71 μm) and alloy 7 (.62 μm) has also been significantly refined after adding rare‐earth oxides, due to the following reasons 41,42 : rare‐earth oxides were not only pinned around the WC grains, which hindered the dissolution–precipitation process of the WC grains, but also dispersed at the grain boundaries of the WC grains to inhibit the migration of the WC grain boundary. In addition, previous studies had shown that adding small amount of rare‐earth oxides could improve the wetting ability of Co to WC grains, refine WC grains and control the uneven grain growth 30,43,44 …”

Section: Resultsmentioning

confidence: 99%

“…The XRD patterns of the powders and sintered samples are shown in Figure 3 35 There are no diffraction peaks of Al 2 O 3 , La 2 O 3 , Y 2 O 3 and CeO 2 in XRD patterns of the samples because of the detection limit of XRD analysis. 30 The expanded XRD patterns in the 2θ range of 30,38 The SEM patterns of the in situ synthesized powders with various additives are shown in Figure 4. From Figure 4, powders of different compositions exhibit similar spherical submicron-sized particles.…”

Section: Phase Composition and Microstructuresmentioning

confidence: 99%

“…The results indicated that replacing some part of Co with Al 2 O 3 (WC-3 wt% Co-3 wt% Al 2 O 3 ) led to higher strength, hardness and fracture toughness. Huang et al 30 studied the effects of different sizes of CeO 2 on the performance of WC-10Co, and the results showed that the refining effect of nano-CeO 2 was better than that of micron sized CeO 2 . Qu et al 31 investigated the effects of trace amount of CeO 2 addition on the comprehensive properties of WC-A1 2 O 3 composites.…”

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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Section: Resultssupporting

confidence: 92%

Section: Resultsmentioning

confidence: 98%