Phase stability and mechanical properties of Al2O3-cBN composites prepared via spark plasma sintering

Klimczyk, Piotr; Wyzga, Piotr; Cyboroń, Jolanta; Laszkiewicz-Łukasik, Jolanta; Podsiadło, Marcin; Cygan, S.; Jaworska, L.

doi:10.1016/j.diamond.2020.107762

Cited by 25 publications

(15 citation statements)

References 20 publications

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“…The optimization of sintering temperature was made for each composition. Similarly, as in the report [21], the values of density and Young's modulus formed the preliminary criteria for the assessment of the consolidation degrees of the sintered compacts. We found interesting differences in SPS sintering behavior of pure Al 2 O 3 -ZrO 2 oxide-matrix in comparison to the sintering behavior of the Al 2 O 3 -ZrO 2 -cBN composites, Figure 1.…”

Section: Resultsmentioning

confidence: 93%

“…According to the results illustrated in Figure 1, the addition of cBN to Al 2 O 3 -ZrO 2 matrix resulted in a decrease in sintering temperature. What is interesting is that this phenomenon has not been observed for composites having only one oxide in the matrix (Al 2 O 3 -cBN or ZrO 2 -cBN), [21].…”

Section: Resultsmentioning

confidence: 99%

“…Very recently, Klimczyk et al [21] investigated the sintering behavior, phase composition, microstructure characteristics, and mechanical properties of Al 2 O 3 -cBN based composites with an addition of TiN and ZrO 2 , prepared by SPS. According to the results, Young's modulus of the systems sintered at different temperatures provides indirect, qualitative information on the cB→hBN transition, which seems to be even more sensitive than XRD analysis.…”

Section: Introductionmentioning

confidence: 99%

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Micro/Nano Indentation Testing of Spark Plasma Sintered Al2O3 + ZrO2 + cBN Ceramics

et al. 2021

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Al2O3 + 30 vol% ZrO2 matrix composites with 20 and 30 vol% cBN have been prepared with the optimized processing route, using spark plasma sintering (SPS) at temperatures of 1400 °C and 1250 °C. The influence of cBN addition on the microstructure characteristics, micro/nanohardness, elastic modulus, and crack-extension resistance of the composites and their constitutions have been investigated using scanning electron microscopy (SEM), statistical analyses of the individual grain size and micro/nanoindentation methods. The matrix consists of alumina and zirconia grains with grain sizes/diameter of approximately 220 and 160 nm with approximately 1.9 μm cBN grains in the Al2O3 + ZrO2 + cBN composites. The microhardness is slightly increasing with cBN addition from 16.2 to 17.1 GPa and the crack-extension resistance from 3.72 to 4.29 MPa.m1/2. The toughening mechanisms are in the form of crack deflection, crack branching, and crack bridging. The nanohardness and indentation modulus of the matrix are approximately 30 and 420 GPa, and the cBN grains 70 and 777 GPa, respectively.

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Section: Resultsmentioning

confidence: 93%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Micro/Nano Indentation Testing of Spark Plasma Sintered Al2O3 + ZrO2 + cBN Ceramics

et al. 2021

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“…Notably, good improvements in fracture toughness, of about 1.5 MPa•m 1/2 on average over that of Al 2 O 3 , are observed in the case of composites sintered with cBN. Crack deflection on cBN grains is identified as the main toughening mechanism of the materials investigated (Klimczyk et al 2020).…”

Section: Fast/sps Technique-history and Developmentmentioning

confidence: 99%

Spark Plasma Sintering/Field Assisted Sintering Technique as a Universal Method for the Synthesis, Densification and Bonding Processes for Metal, Ceramic and Composite Materials

Laszkiewicz-Łukasik¹,

Putyra²,

Klimczyk³

et al. 2021

J. Appl. Mater. Eng.

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This paper presents the technology of powder sintering by the spark plasma sintering method, also known as the field assisted sintering technique. The mechanisms, compared to other sintering techniques, advantages of this system, applied modifications and the history of the development of this technique are presented. Spark Plasma Sintering (SPS) uses uniaxial pressing and pulses of electric current. The direct flow of current through the sintered material allows high heating rates to be reached. This has a positive effect on material compaction and prevents the grain growth of sintered compact. The SPS mechanism is based on high-energy spark discharges. A low-voltage current pulse increases the kinetics of diffusion processes. The SPS temperature is up to 500 °C lower than the sintering temperature using conventional methods. The phenomena that occur during sintering with the Field Assisted Sintering Technology (FAST)/SPS method give great results for consolidating all types of materials, including those which are nonconductive. This method is used, among others, in relation to metals, alloys and ceramics, including advanced and ultra-high-temperature ceramics. Due to the good results and universality of this method, in recent years it has been developed and often used in research institutions, but also in industry.

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“…This results in restrictions in geometry and costs. Therefore different attempts were carried out to produce cBN-based ceramic composites, to find sintering conditions for manufacturing at low pressure and evaluating the properties of these composites with cubic boron nitride [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 ].…”

Section: Introductionmentioning

confidence: 99%

Thermal Stability of TiN Coated Cubic Boron Nitride Powder

et al. 2021

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Wear-resistant, super hard ceramic composites based on cubic boron nitride (cBN) are of great interest to industry. However, cBN is metastable under sintering conditions at normal pressure and converts into the soft hexagonal BN (hBN). Therefore, efforts are being made to avoid this process. Besides short sintering times, the use of coated cBN-particles is a way to minimize this process. Therefore, the thermal stability of TiN coated cBN powders in high purity argon and nitrogen atmospheres up to temperatures of 1600 °C was investigated by thermogravimetry, X-ray phase analysis, scanning electron microscopy and Raman spectroscopy. The TiN coating was prepared by the atomic layer deposition (ALD)-method. The investigations showed that the TiN layer reacts in Ar at T ≥ 1200 °C with the cBN and forms a porous TiB2 layer. No reaction takes place in nitrogen up to temperatures of 1600 °C. Nevertheless, the 20 and 50 nm thin coatings also undergo a recrystallization process during heat treatment up to temperatures of 1600 °C.

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Phase stability and mechanical properties of Al2O3-cBN composites prepared via spark plasma sintering

Cited by 25 publications

References 20 publications

Micro/Nano Indentation Testing of Spark Plasma Sintered Al2O3 + ZrO2 + cBN Ceramics

Micro/Nano Indentation Testing of Spark Plasma Sintered Al2O3 + ZrO2 + cBN Ceramics

Spark Plasma Sintering/Field Assisted Sintering Technique as a Universal Method for the Synthesis, Densification and Bonding Processes for Metal, Ceramic and Composite Materials

Thermal Stability of TiN Coated Cubic Boron Nitride Powder

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