Influence of chromium diboride on the oxidation resistance of ZrB2-MoSi2 and ZrB2-SiC ceramics

Grigoriev, O. N.; Neshpor, I. P.; Vedel, D. V.; Mosina, T. V.; Silvestroni, Laura

doi:10.1016/j.jeurceramsoc.2020.12.036

Cited by 21 publications

(6 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…More shrinkage was observed for (Ti 0.9 Cr 0.1 )B 2 ceramics compared to the nominally pure TiB 2 ceramic, considering also the slope of the curves, which was consistent with the higher measured relative density of the (Ti 0.9 Cr 0.1 )B 2 ceramic, as shown in Table 2. In comparison to a previous study, 13 the present results indicated that Cr additions promoted the densification of TiB 2 ceramics presumably due to a change in densification kinetics caused by the solid solution effect 17,18 …”

Section: Resultscontrasting

confidence: 46%

“…In comparison to a previous study, 13 the present results indicated that Cr additions promoted the densification of TiB 2 ceramics presumably due to a change in densification kinetics caused by the solid solution effect. 17,18 The synthesized TiB 2 and (Ti 0.9 Cr 0.1 )B 2 powders had similar particle sizes of about 0.4 ± 0.1 μm, as shown in Figure 2A,C. The fine particle size of the starting powder mixtures and mild vacuum promoted BCTR at lower temperatures, thus resulting in fine particle size after BCTR 16 .…”

Section: Resultsmentioning

confidence: 79%

See 1 more Smart Citation

Superhard single‐phase (Ti,Cr)B₂ ceramics

Fahrenholtz

Hilmas

et al. 2022

J Am Ceram Soc.

View full text Add to dashboard Cite

A nominally pure and dense (Ti0.9Cr0.1)B2 ceramic was produced by spark plasma sintering of powders synthesized by boro/carbothermal reduction of oxides. The synthesized powders were a single phase and had an average particle of 0.4 ± 0.1 μm and an oxygen content of 1.2 wt%. Average Vickers hardness values of the resulting ceramics increased from 25.9 ± 0.8 GPa at a load of 9.81 N, to 46.3 ± 0.8 GPa at a load of 0.49 N. Compared to the nominally pure TiB2 ceramic obtained under the same processing conditions, the (Ti0.9Cr0.1)B2 ceramic had higher values under the same load due to the finer average grain size (2.4 ± 1.0 μm), higher relative density, and solid solution hardening. The results indicated that the Cr addition promoted densification, suppressed grain growth, and improved the hardness of TiB2 ceramics. This is the first report for dense and single‐phase (Ti,Cr)B2 ceramics as superhard materials.

show abstract

Section: Resultscontrasting

confidence: 46%

Section: Resultsmentioning

confidence: 79%

Superhard single‐phase (Ti,Cr)B₂ ceramics

Fahrenholtz

Hilmas

et al. 2022

J Am Ceram Soc.

View full text Add to dashboard Cite

show abstract

“…Boride additives, including TaB 2 , YB 4 , TiB 2 , CrB 2 , HfB 2 , etc. [28][29][30][31][32][33][34][35][36] could promote densification, inhibit grain growth, and increase hardness but hardly improve the oxidation resistance of the composite. Silicide additives [37][38][39][40][41][42][43][44][45][46][47][48][49] such as ZrSi 2 and MoSi 2 can significantly improve the oxidation resistance of composites, increase fracture toughness, and reduce sintering temperature, so they are considered excellent additives.…”

Section: Introductionmentioning

confidence: 99%

“…Many other additives besides SiC were also introduced into diboride‐based ceramics. Boride additives, including TaB 2 , YB 4 , TiB 2 , CrB 2 , HfB 2 , etc 28–36 . could promote densification, inhibit grain growth, and increase hardness but hardly improve the oxidation resistance of the composite.…”

Section: Introductionmentioning

confidence: 99%

Effects of refractory metal additives on diboride‐based ultra‐high temperature ceramics: A review

Meng

Fang

Wang³

et al. 2023

Int J Applied Ceramic Tech

View full text Add to dashboard Cite

Diboride-based ultra-high temperature ceramics (UHTCs) are a special class of ceramics with excellent comprehensive properties, which have extensive potential applications in extreme environments. However, their practical applications are limited, mainly due to the poor fracture toughness and thermal shock resistance. Refractory metals have high melting points, good ductility, and high toughness, which have huge potential to improve the properties of diboridebased ceramics. As a special class of additives, they have been adopted to promote densification, improve microstructure, and properties. However, diboride-based ceramics containing refractory metals have not received adequate attention due to relatively weak practical effects on property improvement. The present review highlights the progress and existing problems of transition metal diborides with refractory metal additives, including W, Ta, Mo, Nb, Hf, V, Cr, and Zr, focusing mainly on the microstructure change and property improvements, followed by challenges and possible future development strategies.

show abstract

“…The addition of TiB 2 was coupled with the concomitant introduction of another functionalizing TM to compensate for the decrease in oxidation behaviour that accompanies TiO 2 formation. In this respect, CrB 2 was selected based on its oxide's melting point, its capability to promote densification [18] and to increase the hardness of ZrB 2 [8], and its ability to retard oxidation [19,20]. Furthermore, if included in the major boride solid solution, Cr may assume a metallic nature and remain encapsulated in the oxide once the ceramic is exposed to oxidation (Fig.…”

Section: Introduction mentioning

confidence: 99%

Multi-phase (Zr,Ti,Cr)B ₂ solid solutions: Preparation, multi-scale microstructure, and local properties

Silvestroni¹,

Gilli²,

Sangiorgi³

et al. 2023

Journal of Advanced Ceramics

View full text Add to dashboard Cite

Multi-phase ceramics based on ZrB 2 , TiB 2 and doped with CrB 2 and SiC were prepared by powder metallurgy and hot pressing to explore the possibility of obtaining multi-scale microstructures by super-saturation of complex (Zr,Ti,Cr)B 2 solid solutions. Core-shell structures formed in TiB 2 grains, whereas ZrB 2 appeared to form a homogeneous solid solution with the other metals. Precipitation of nano-inclusions within both micron-sized borides was assessed by transmission electron microscopy and thermodynamics elucidated the preferential formation of boride inclusions due to the specific sintering atmosphere. In addition, atomic size factors explicated the precipitation of CrB 2 nano-particles into ZrB 2 -rich grains and of ZrB 2 nano-particles into TiB 2 -rich grains. The hardness of the constituent phases measured by nanoindentation ranged from 36 to 43 GPa.

show abstract

Influence of chromium diboride on the oxidation resistance of ZrB2-MoSi2 and ZrB2-SiC ceramics

Cited by 21 publications

References 18 publications

Superhard single‐phase (Ti,Cr)B₂ ceramics

Superhard single‐phase (Ti,Cr)B₂ ceramics

Effects of refractory metal additives on diboride‐based ultra‐high temperature ceramics: A review

Multi-phase (Zr,Ti,Cr)B ₂ solid solutions: Preparation, multi-scale microstructure, and local properties

Contact Info

Product

Resources

About

Influence of chromium diboride on the oxidation resistance of ZrB2-MoSi2 and ZrB2-SiC ceramics

Cited by 21 publications

References 18 publications

Superhard single‐phase (Ti,Cr)B2 ceramics

Superhard single‐phase (Ti,Cr)B2 ceramics

Effects of refractory metal additives on diboride‐based ultra‐high temperature ceramics: A review

Multi-phase (Zr,Ti,Cr)B 2 solid solutions: Preparation, multi-scale microstructure, and local properties

Contact Info

Product

Resources

About

Superhard single‐phase (Ti,Cr)B₂ ceramics

Superhard single‐phase (Ti,Cr)B₂ ceramics

Multi-phase (Zr,Ti,Cr)B ₂ solid solutions: Preparation, multi-scale microstructure, and local properties