Effect of the ZrO2 Content on the Strength Characteristics of the Matrix Material of Cdiamond–(WC–Co) Composites Synthesized by Spark Plasma Sintering

IF 1.2 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Journal of Superhard Materials Pub Date : 2024-07-08 DOI:10.3103/S1063457624030079

B. T. Ratov, E. Hevorkian, V. A. Mechnik, N. A. Bondarenko, V. M. Kolodnitskyi, T. O. Prikhna, V. E. Moshchil, V. P. Nerubaskyi, A. B. Kalzhanova, R. U. Bayamirova, A. R. Togasheva, M. D. Sarbopeeva

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Abstract—For structurally homotypical specimens different in the ZrO₂ content from the (94WC–6Co) + ZrO₂ matrix material used in diamond-containing С_diamond–(WC–Co) composites formed by spark plasma sintering, the dependences of the relative density ρ_rel, the ultimate strength under compression R_cm and bending R_bm, the microhardness Н_V, and the fracture toughness K_Iс on the zirconia content have been established. The addition of 6 wt % zirconia to the WC–6Co composite leads to an increase in the relative density from 0.948 to 0.990, the ultimate compression strength R_cm from 4950 ± 110 to 5600 ± 120 MPa, the ultimate bending strength R_bm from 1935 ± 80 to 2660 ± 115 MPa, and the fracture toughness K_Iс from 13.8 ± 0.71 to 16.9 ± 0.76 MPa m^0.5 at a slight decrease in hardness (from 15.9 ± 0.72 to 15.1 ± 0.33 GPa). Such values are caused by the decrease of main WC phase grains in size with tetragonal t-ZrO₂ phase transformation and, correspondingly, by the growing role of transformation strengthening mechanism and the active action of inner mechanical compressive microstresses. When the ZrO₂ additive to the WC–6Co composite is increased to 10%, the parameters ρ_rel, R_cm, R_bm, and K_Iс are gradually decreased. At the same time, the material at the indentor imprint edge begins to destruct, and crack propagate in a chaotic way. It has been revealed that the properties ρ_rel, R_cm, R_bm, and K_Ic are worsened at a zirconia nanopowder content above 6 wt % in the WC–Co composite due to the formation of agglomerates during the mixing of components, their separation under sintering, and the formation of micropores and microcracks.

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ZrO2 含量对火花等离子烧结法合成的金刚石-（WC-Co）复合材料基体材料强度特性的影响

摘要-对于火花等离子烧结形成的含金刚石的Сdiamond-（WC-Co）复合材料中使用的 (94WC-6Co) + ZrO2 基体材料中不同 ZrO2 含量的结构同型试样，确定了相对密度 ρrel、压缩极限强度 Rcm 和弯曲极限强度 Rbm、显微硬度 НV 和断裂韧性 KIс 与氧化锆含量的关系。在 WC-6Co 复合材料中添加 6 wt % 的氧化锆会使相对密度从 0.948 增加到 0.990，极限压缩强度 Rcm 从 4950 ± 110 兆帕增至 5600 ± 120 兆帕，极限弯曲强度 Rbm 从 1935 ± 80 兆帕增至 2660 ± 115 兆帕，断裂韧性 KIс 从 13.8 ± 0.71 兆帕增至 16.9 ± 0.76 兆帕 m0.5，而硬度略有下降（从 15.9 ± 0.72 GPa 降至 15.1 ± 0.33 GPa）。出现这种值的原因是随着四方 t-ZrO2 相变，主要的 WC 相晶粒尺寸减小，相应地，转变强化机制的作用和内部机械压缩微应力的积极作用也越来越大。当 WC-6Co 复合材料中的 ZrO2 添加剂增加到 10% 时，参数 ρrel、Rcm、Rbm 和 KIс 逐渐减小。同时，压痕边缘的材料开始破坏，裂纹以混乱的方式扩展。研究表明，当氧化锆纳米粉体在 WC-Co 复合材料中的含量超过 6 wt % 时，ρrel、Rcm、Rbm 和 KIc 的性能会恶化，这是因为在成分混合过程中会形成团聚体，在烧结过程中会分离，并且会形成微孔和微裂纹。

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来源期刊

Journal of Superhard Materials MATERIALS SCIENCE, MULTIDISCIPLINARY-

CiteScore

1.80

自引率

66.70%

发文量

审稿时长

2 months

期刊介绍： Journal of Superhard Materials presents up-to-date results of basic and applied research on production, properties, and applications of superhard materials and related tools. It publishes the results of fundamental research on physicochemical processes of forming and growth of single-crystal, polycrystalline, and dispersed materials, diamond and diamond-like films; developments of methods for spontaneous and controlled synthesis of superhard materials and methods for static, explosive and epitaxial synthesis. The focus of the journal is large single crystals of synthetic diamonds; elite grinding powders and micron powders of synthetic diamonds and cubic boron nitride; polycrystalline and composite superhard materials based on diamond and cubic boron nitride; diamond and carbide tools for highly efficient metal-working, boring, stone-working, coal mining and geological exploration; articles of ceramic; polishing pastes for high-precision optics; precision lathes for diamond turning; technologies of precise machining of metals, glass, and ceramics. The journal covers all fundamental and technological aspects of synthesis, characterization, properties, devices and applications of these materials. The journal welcomes manuscripts from all countries in the English language.