Composition dependence of the abrasive properties of fused niobium carbide powder

Samsonov, G. V.; Stepanchuk, A. N.; Pritulyak, A. S.; Shlyuko, V. Ya.; Adamovskii, A. A.

doi:10.1007/bf00804077

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“…Vickers hardness of grains under a 9.8 N load was 22.3 ± 1.6 GPa for TiB 2 and 19.8 ± 0.4 GPa for NbB 2 , respectively, which is consistent with the hardness measurements of the individual ceramics bulks . Furthermore, it should be noted that NbC carbide, possess one of the highest abrasive ability among transition‐metal carbides of group IV and V . Hence, it is thought that NbB 2 may have similar properties compared to TiB 2 , since specimen with highest TiB 2 content had the higher number of the voids after polishing.…”

Section: Resultssupporting

confidence: 79%

Fracture and property relationships in the double diboride ceramic composites by spark plasma sintering of TiB₂ and NbB₂

et al. 2019

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Bulk titanium diboride-niobium diboride ceramic composites were consolidated by spark plasma sintering (SPS) at 1950°C. SPS resulted in dense specimens with a density exceeding 98% of the theoretical density and a multimodal grain size ranging from 1 to 10 μm. During the SPS consolidation, the pressure was applied and released at 1950 and 1250°C, respectively. This allowed obtaining a twophase composite consisting of TiB 2 and NbB 2 . For these ceramics composites, we evaluated the flexural strength and fracture toughness and room and elevated temperatures. Room-temperature strength of thus produced bulks was between 300 and 330 MPa, at 1200°C or 1600°C an increase in strength up to 400 MPa was observed. Microstructure after flexure at elevated temperatures revealed the appearance of the needle-shape subgrains of NbB 2 , an evidence for ongoing plastic deformation. TiB 2 -NbB 2 composites had elastic loading stress curves at 1600°C, and at 1800°C fractured in the plastic manner, and strength was ranged from 300 to 450 MPa. These data were compared with a specimen where a (Ti, Nb)B 2 solid solution was formed during SPS to explain the behavior of TiB 2 -NbB 2 ceramic composites at elevated temperatures. K E Y W O R D Scomposite, elevated temperature strength, flexural strength, niobium diboride, titanium diboride

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Section: Resultssupporting

confidence: 79%

Fracture and property relationships in the double diboride ceramic composites by spark plasma sintering of TiB₂ and NbB₂

et al. 2019

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show abstract

Composition dependence of the abrasive properties of fused niobium carbide powder

Cited by 1 publication

References 1 publication

Fracture and property relationships in the double diboride ceramic composites by spark plasma sintering of TiB₂ and NbB₂

Fracture and property relationships in the double diboride ceramic composites by spark plasma sintering of TiB₂ and NbB₂

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Composition dependence of the abrasive properties of fused niobium carbide powder

Cited by 1 publication

References 1 publication

Fracture and property relationships in the double diboride ceramic composites by spark plasma sintering of TiB2 and NbB2

Fracture and property relationships in the double diboride ceramic composites by spark plasma sintering of TiB2 and NbB2

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Fracture and property relationships in the double diboride ceramic composites by spark plasma sintering of TiB₂ and NbB₂

Fracture and property relationships in the double diboride ceramic composites by spark plasma sintering of TiB₂ and NbB₂