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Structure and mechanical properties of zirconium diboride‐based ceramics produced by the spark plasma sintering.

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Bibliographic Details
Title:	Structure and mechanical properties of zirconium diboride‐based ceramics produced by the spark plasma sintering.
Authors:	Melakh, Liudmyla¹ (AUTHOR) liudmyla.melakh@taltech.ee, Vedel, Dmytro² (AUTHOR), Juhani, Kristjan¹ (AUTHOR), Tarraste, Marek¹ (AUTHOR), Traksmaa, Rainer¹ (AUTHOR), Viljus, Mart¹ (AUTHOR)
Source:	International Journal of Applied Ceramic Technology. Feb2026, Vol. 23 Issue 1, p1-7. 7p.
Subjects:	Zirconium boride, Sintering, Mechanical behavior of materials, Additives, Hardness, Fracture toughness, Microstructure
Abstract:	This article investigates the impact of second‐phase additives on the structure and mechanical properties of zirconium diboride (ZrB2)‐based ceramic materials. The materials obtained were characterized by X‐ray diffraction, scanning electron microscopy, and Vickers hardness (HV) analysis. As a result, in the temperature range of 1800–2000°C, dense ceramic materials with a fine‐grained structure and uniform distribution of secondary phases were obtained. Additives such as molybdenum disilicide (MoSi2), silicon carbide (SiC), molybdenum carbide (Mo2C), and tungsten carbide (WC) lowered the sintering temperature compared to the sintering of pure ZrB2. HV measured at loads from 1 to 20 kg showed a weak dependence of hardness on the load. Maximum hardness values were achieved for the three‐component ceramics ZB2 + 15 vol.% SiC + 5 vol.% Mo2C and ZB2 + 15 vol.% SiC + 5 vol.% WC (HV20 = 18.68 GPa and 19.33 GPa, respectively) due to increased density of the materials and small grain sizes. The addition of 15 vol.% MoSi2 leads to an increase in the fracture toughness (5.04 MPa*m1/2) and grain boundary strength (0.58 GPa). This points to the formation of grain boundary states with increased strength (σf = 0.48 GPa). [ABSTRACT FROM AUTHOR]
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Database:	Engineering Source

Description
Abstract:	This article investigates the impact of second‐phase additives on the structure and mechanical properties of zirconium diboride (ZrB2)‐based ceramic materials. The materials obtained were characterized by X‐ray diffraction, scanning electron microscopy, and Vickers hardness (HV) analysis. As a result, in the temperature range of 1800–2000°C, dense ceramic materials with a fine‐grained structure and uniform distribution of secondary phases were obtained. Additives such as molybdenum disilicide (MoSi2), silicon carbide (SiC), molybdenum carbide (Mo2C), and tungsten carbide (WC) lowered the sintering temperature compared to the sintering of pure ZrB2. HV measured at loads from 1 to 20 kg showed a weak dependence of hardness on the load. Maximum hardness values were achieved for the three‐component ceramics ZB2 + 15 vol.% SiC + 5 vol.% Mo2C and ZB2 + 15 vol.% SiC + 5 vol.% WC (HV20 = 18.68 GPa and 19.33 GPa, respectively) due to increased density of the materials and small grain sizes. The addition of 15 vol.% MoSi2 leads to an increase in the fracture toughness (5.04 MPa*m1/2) and grain boundary strength (0.58 GPa). This points to the formation of grain boundary states with increased strength (σf = 0.48 GPa). [ABSTRACT FROM AUTHOR]
ISSN:	1546542X
DOI:	10.1111/ijac.70131