Phase Composition, Structure and Properties of the Spark Plasma Sintered Ceramics Obtained from the Al12Mg17-B-Si Powder Mixtures

Nikitin, Pavel; Zhukov, Ilya; Matveev, Alexey; Соколов, С. Д.; Sachkov, V. I.; Vorozhtsov, Alexander

doi:10.3390/nano12111895

Cited by 3 publications

(2 citation statements)

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“…The properties of such materials based on ZrO 2 and ZrB 2 have been reported by Zhang et al [22] and Balak et al [23]. For the AlMgB 14 composites, the compositions with the addition of Cu [15], Al [16], Si [26], TiB 2 [27] are intensively studying along with the study of the possibility of brazing of the AlMgB 14 -based materials to the metallic base in order to combine high hardness and low frictional coefficient of the ceramic with high fracture toughness of metal [28].…”

Section: Discussionmentioning

confidence: 81%

Structure and flexural strength of the hot-pressed AlMgB₁₄ ceramic

Tkachev¹,

Nikitin²,

Zhukov³

et al. 2023

Phys. Scr.

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AlMgB14 materials were obtained by hot-pressing of the prereacted AlMgB14 powder. The phase composition, structure, hardness and flexural strength have been studied. The XRD studies shown that the phase composition of the obtained materials contains from 9 to 12 wt. % of the spinel MgAl2O4 phase except target AlMgB14-phase. The spinel content increases linearly with an increase in the hot-pressing temperature from 1400 °C to 1600 °C. It was found that the density of the studied materials non-linearly depends on the hot-pressing temperature. An increase in the hot-pressing temperature from 1400 °C to 1500 °C leads to an increase in the relative density of the samples from 84 % to 93 %, respectively. A further increase in the hot-pressing temperature to 1600 °C leads to a decrease in the relative density to 81 % due to the complication of the densification processes with an increase in the spinel content. An increase in the relative density from 81 % to 93 % leads to an increase in the flexural strength from 121 to 314 MPa and an increase in the Vickers microhardness from 5.1 to 7.9 GPa, respectively.

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Section: Discussionmentioning

confidence: 81%

Structure and flexural strength of the hot-pressed AlMgB₁₄ ceramic

Tkachev¹,

Nikitin²,

Zhukov³

et al. 2023

Phys. Scr.

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“…In combination with titanium diboride, materials based on AlMgB 14 demonstrate hardness reaching 46 GPa [ 2 ], which classifies AlMgB 14 –TiB 2 composite materials as superhard. As of yet, the main efforts of scientists have been directed at studying the influence of production methods (one-stage or two-stage sintering) and the composition of the initial mixture (ratio of initial elements, pre-reacted powders or mechanical mixture) on the structure, phase formation processes and properties of AlMgB 14 -based materials [ 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 ]. Today, it is traditionally considered that the best sintering methods for obtaining AlMgB 14 are spark plasma sintering and hot pressing of AlMgB 14 powder mixtures [ 2 , 14 , 15 , 16 , 17 , 21 , 22 , 23 ].…”

Section: Introductionmentioning

confidence: 99%

On the Tensile Strength of Spark Plasma Sintered AlMgB14 Ceramics

et al. 2022

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In this work, the structure, phase composition, hardness and tensile strength of the AlMgB14-based material obtained by spark plasma sintering (SPS) were investigated. According to the XRD results, the spark plasma sintered material contains 94 wt% AlMgB14 phase and 6 wt% spinel MgAl2O4. Analysis of the SEM images showed that the obtained AlMgB14 sample has a dense structure; the relative density of the sample is 98.6%. The average microhardness of the spark plasma sintered (SPSed) sample is 29 ± 0.88 GPa. According to the results of the Brazilian test, the tensile strength of AlMgB14 is 56 MPa. The fracture is characterized by a single straight tensile crack that divides the sample along the compression line into two halves. The type of fracture in the AlMgB14 sample can be characterized as a cleavage fracture due to crack growth occurring in accordance with the transcrystalline fracture. The tensile strength of the obtained material is in good agreement with the tensile strength of boride and oxide ceramics studied in other works.

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Advances in Electrical Discharge Machining of Insulating Ceramics

Grigoriev,

Volosova,

Okunkova

2023

Materials

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There are two main ways of carrying out the electrical discharge machining of the insulating ceramics: changing the electrical and chemical properties of ceramics due to additives in producing composites/nanocomposites and changing the electrical and chemical properties in the interelectrode gap. This review summarizes and analyzes the current data on the machinability in water suspension and hydrocarbons depending on the electrical properties of the ceramic composites and assisting means such as coating and powder. There are provided the existing approaches and original methods for solving the global problem of the electrical discharge machining of insulating ceramics, suggesting further development of the existing methods since, up to now, the experimental research is non-systemic. The dependencies of the machinability on the electrical properties of conductive ceramic composites, the specific electrical resistance of the assisting coating, and the assisting powder’s band gap and concentration for machining insulating ceramics are revealed. The higher the electrical conductivity, the higher the machinability of ceramic composites, and the lower the band gap, the higher the machinability for insulating ceramics. Two technological gaps were revealed in the powder’s concentration that can be a particular case of logarithmic decrement of attenuation. The proposed approach suggests using assisting powder with the lower band gap.

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Phase Composition, Structure and Properties of the Spark Plasma Sintered Ceramics Obtained from the Al12Mg17-B-Si Powder Mixtures

Cited by 3 publications

References 25 publications

Structure and flexural strength of the hot-pressed AlMgB₁₄ ceramic

Structure and flexural strength of the hot-pressed AlMgB₁₄ ceramic

On the Tensile Strength of Spark Plasma Sintered AlMgB14 Ceramics

Advances in Electrical Discharge Machining of Insulating Ceramics

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Phase Composition, Structure and Properties of the Spark Plasma Sintered Ceramics Obtained from the Al12Mg17-B-Si Powder Mixtures

Cited by 3 publications

References 25 publications

Structure and flexural strength of the hot-pressed AlMgB14 ceramic

Structure and flexural strength of the hot-pressed AlMgB14 ceramic

On the Tensile Strength of Spark Plasma Sintered AlMgB14 Ceramics

Advances in Electrical Discharge Machining of Insulating Ceramics

Contact Info

Product

Resources

About

Structure and flexural strength of the hot-pressed AlMgB₁₄ ceramic

Structure and flexural strength of the hot-pressed AlMgB₁₄ ceramic