Features Structure of the Сdiamond‒(WC‒Co)‒ZrO2 Composite Fracture Surface as a Result of Impact Loading

IF 1.2 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Journal of Superhard Materials Pub Date : 2023-11-13 DOI:10.3103/S1063457623050088

B. T. Ratov, V. A. Mechnik, N. A. Bondarenko, V. M. Kolodnitskyi, E. S. Gevorkyan, V. P. Nerubaskyi, A. G. Gusmanova, B. V. Fedorov, N. A. Kaldibaev, M. T. Arshidinova, V. G. Kulych

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Abstract—

The effect of the addition of ZrO₂ micropowder (in the range from 0 to 10%) on the structural changes of the hard alloy matrix in the area of fracture as a result of impact loading of a sample of composite diamond-containing material (DCM) 25С_diamond–70.5WC‒4.5Co wt % was studied, formed by the method of spark plasma sintering in the temperature range from 20 to 1350°С at a pressure of 30 MPa for 3 min. It was found that in the DCM sample without ZrO₂ additive, the structure of the hard alloy matrix has the appearance characteristic of brittle fracture, which is evidenced by the smooth relief of the fracture surface. In this case, the destruction of the DCM sample occurs by chipping of the components of the hard alloy matrix, which leads to a decrease in its wear resistance. The introduction of the ZrO₂ additive in the amount of 4% into the composition of DCM causes a change in the structure of the fracture surface. On the fracture surface of the carbide matrix of the DCM sample, nanopores with a structural size of ~100–500 nm are formed as a result of viscous (pitting) fracture. At the same time, in addition to the formation of dimples on the fracture surface of the hard alloy matrix, a highly developed relief is simultaneously formed on the surface of the diamond grain, which is evidence of improved diamond retention and increased wear resistance of the composite. With a further increase to 10% of the ZrO₂ additive in the DCM composition, a more pronounced microrelief with the presence of deep dimples and microcracks is formed on the fracture surfaces of the hard alloy matrix and diamond grain. It is proposed to use the type of relief of the fracture surface of sintered DCM samples during impact fracture at room temperature as an assessment of the characteristics of the strength of diamond retention.

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冲击载荷作用下Сdiamond - (WC-Co) - zro2复合材料断口结构

摘要效应的氧化锆超细粉(范围从0到10%)的结构性变化硬质合金领域的矩阵骨折由于复合diamond-containing样品材料的冲击荷载(DCM) 25С钻石- 70.5 - 4.5 wc - co wt %进行了研究,由火花等离子烧结的方法在温度范围从20到1350°С30 MPa的压力为3分钟。这是发现在DCM样本没有锆添加剂,硬合金基体的组织具有脆性断裂的外观特征，断口表面的光滑起伏证明了这一点。在这种情况下，DCM样品的破坏是由于硬质合金基体成分的切屑，导致其耐磨性下降。在DCM中加入4%的ZrO2添加剂后，断口组织发生了变化。在DCM试样的碳化物基体断口处，由于黏性(点蚀)断裂，形成了结构尺寸为~100 ~ 500nm的纳米孔。同时，在硬质合金基体断口处除了形成韧窝外，金刚石晶粒表面也同时形成高度发达的浮雕，表明复合材料的金刚石固位改善，耐磨性提高。当DCM成分中ZrO2添加量进一步增加到10%时，硬质合金基体和金刚石晶粒断口处形成了更明显的微形变，出现了深韧窝和微裂纹。提出用烧结DCM试样在室温冲击断裂时断口的起伏类型来评价金刚石保留强度的特征。

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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.