Microstructure and mechanical properties of Al2O3 - WC - Co composites obtained by spark plasma sintering

Azevêdo, Heytor V.S.B.; Raimundo, Rafael A.; Silva, David D.S.; Morais, Luís M.F.; Macedo, Daniel A.; Cavalcante, Danielle G.L.; Gomes, Uílame Umbelino

doi:10.1016/j.ijrmhm.2020.105408

Cited by 21 publications

(5 citation statements)

References 36 publications

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“…Sintering temperatures were from 20 °С up to 1000 °С. It is worth noting that the temperature and time of sintering are below the recently reported 1550 °C and 5 min [42], which indicates substantial savings and lays in accordance with optimisation of the sintering method named among the main measures to improve diamond composites [43].…”

Section: Methodsmentioning

confidence: 67%

Combined Effect of CrB<sub>2</sub> Micropowder and VN Nanopowder on the Strength and Wear Re-sistance of Fe‒Cu–Ni–Sn Matrix Diamond Composites

Ratov¹,

Мечник²,

Rucki³

et al. 2023

Adv. Sci. Technol. Res. J.

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The paper presents research results on the enhancement of diamond composites designed for tools application for mining industry, hard rocks cutting, able to withstand harsh conditions under heavy dynamical loads. In the present study, both CrB 2 micropowder and VN nanopowder additives were used in proportions up to 5 wt.% and 6 wt.%, respectively, together with the basic matrix composition of 51 wt.% Fe, 32 wt.% Cu, 9 wt.% Ni, and 8 wt.% Sn. Addition of both components, CrB 2 and VN, appeared to be advantageous in proportion of 2 wt.% and 4 wt.%, respectively. This composition exhibited the highest relative density of 0.9968, better than that without additives. Similarly, the highest values of compressive strength R cm and flexural strength R bm were reached for the composite with the same percentage of CrB 2 and VN. Compared to the composite with no addition of CrB 2 and VN, R cm improved by almost 70%, while R bm by 81%. Additionally, the abovementioned additives enhanced the ability of the matrix to prevent the diamond reinforcement from being torn out of the composite, which is very important under harsh working conditions of the cutting tools. The presence of CrB 2 micropowder and VN nanopowder promoted densification of the matrix and adhesion between the diamond grits and the Fe-Cu-Ni-Sn matrix.

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Section: Methodsmentioning

confidence: 67%

Combined Effect of CrB<sub>2</sub> Micropowder and VN Nanopowder on the Strength and Wear Re-sistance of Fe‒Cu–Ni–Sn Matrix Diamond Composites

Ratov¹,

Мечник²,

Rucki³

et al. 2023

Adv. Sci. Technol. Res. J.

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“…A preliminary study [17] indicated the feasibility of a modified SPS method for nanopowder consolidation, and further studies of the formation of Al 2 O 3 -WC composite structures were then undertaken. Application of a modified field-assisted sintering technique enabled reduction of temperatures and sintering time below the most recently reported 1550 • C and 5 min [18]. This study demonstrated that lower temperature and shorter sintering time prevented grain growth, providing good mechanical properties with substantial energy and time savings.…”

Section: Introductionmentioning

confidence: 70%

Analysis of the Electroconsolidation Process of Fine-Dispersed Structures Out of Hot Pressed Al2O3–WC Nanopowders

et al. 2021

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Fabrication of alumina–tungsten carbide nanocomposite was investigated. Characteristics of the densification and sintering were analyzed considering both the nano-size particle starting powders and the processing stages. Different heating rates were generated during densification and consolidation with a maximal load was applied only after a temperature of 1000 °C was reached. Due to the varying dominance of different physical processes affecting the grains, appropriate heating rates and pressure at different stages ensured that a structure with submicron grains was obtained. With directly applied alternating current, it was found that the proportion Al2O3 (50 wt.%)–WC provided the highest fracture toughness, and a sintering temperature above 1600 °C was found to be disadvantageous. High heating rates and a short sintering time enabled the process to be completed in 12 min, saving energy and time.

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“…Therefore, it is very necessary to improve the Fe-Cr alloy to make these alloys last longer in the scientific field of metallurgy. Recently there have been several techniques of strengthening metal matrices, such as alloying, precipitation strengthening, composites reinforcing, solid solution strengthening, and High energy milling may encourage the wettability of immiscible systems during the sintering, facilitate the interaction of component materials which also improve the strength [10][11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Fabrication and characterization of ZrO₂ reinforced Fe-20Cr alloy composites

Pandey

Singh²,

Singh

et al. 2023

Phys. Scr.

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The reinforcement effects of the ZrO2 and the wear and mechanical behaviour of (Fe,Cr)-based alloy composites were investigated. The (100-x) (Fe80Cr20) -(x) ZrO2 composites were fabricated via powder metallurgy. The iron-chromium and ZrO2 powders were efficiently milled and mixed in ball mill. In the Fe80Cr20 alloy, the effect was investigated by changing the ZrO2 composition by 5%, 10%, and 15%. The microstructure feature and consequent wear behaviour of iron and chromium alloys have been studied using the diversified alloy compositions, various sintering temperatures, and various substrates. The blended powder mixture was cold compacted and sintered at 1300°C. The scanning electron microscopy (SEM), elemental mapping, and X-ray diffraction techniques were utilized to assess the microstructural properties of the sintered composites. In addition, the mechanical properties such as hardness, flexural strength, and porosity were examined with variations in ZrO2 composites. The dry sliding wear tests with various normal loads and a constant sliding distance were used to find the composites wear behaviour. The composite containing 10% ZrO2 has shown the maximum flexural strength with 1470 MPa, and hardness 359.8 HV10, respectively, compared to 5% ZrO2 and 15% ZrO2. With a concentration of 10 wt.% ZrO2, the wear resistance is found to be significantly enhanced, while after 10 wt.% ZrO2, its properties deteriorate. In addition to having improved interfacial bonding, lower porosity, and microstructure uniformity, Fe-10

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Microstructure and mechanical properties of Al2O3 - WC - Co composites obtained by spark plasma sintering

Cited by 21 publications

References 36 publications

Combined Effect of CrB<sub>2</sub> Micropowder and VN Nanopowder on the Strength and Wear Re-sistance of Fe‒Cu–Ni–Sn Matrix Diamond Composites

Combined Effect of CrB<sub>2</sub> Micropowder and VN Nanopowder on the Strength and Wear Re-sistance of Fe‒Cu–Ni–Sn Matrix Diamond Composites

Analysis of the Electroconsolidation Process of Fine-Dispersed Structures Out of Hot Pressed Al2O3–WC Nanopowders

Fabrication and characterization of ZrO₂ reinforced Fe-20Cr alloy composites

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Microstructure and mechanical properties of Al2O3 - WC - Co composites obtained by spark plasma sintering

Cited by 21 publications

References 36 publications

Combined Effect of CrB<sub>2</sub> Micropowder and VN Nanopowder on the Strength and Wear Re-sistance of Fe‒Cu–Ni–Sn Matrix Diamond Composites

Combined Effect of CrB<sub>2</sub> Micropowder and VN Nanopowder on the Strength and Wear Re-sistance of Fe‒Cu–Ni–Sn Matrix Diamond Composites

Analysis of the Electroconsolidation Process of Fine-Dispersed Structures Out of Hot Pressed Al2O3–WC Nanopowders

Fabrication and characterization of ZrO2 reinforced Fe-20Cr alloy composites

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Fabrication and characterization of ZrO₂ reinforced Fe-20Cr alloy composites