Effects of ZrB2 contents on the mechanical properties and thermal shock resistance of B4C–ZrB2 ceramics. (15th April 2015)

• Record Type: Journal Article
• Authors: He, Rujie; Jing, Li; Qu, Zhaoliang; Zhou, Zhili; Ai, Shigang; Kai, Wei
• Is Part Of: Materials & design. Volume 71(2015:Jul.)
• Page Start: 56
• Page End: 61
• Publication Date: 2015-04-15
• Subjects: Carbide boride -- Ceramics -- Microstructure -- Mechanical properties -- Thermal shock resistance; Materials -- Periodicals; Engineering design -- Periodicals; Matériaux -- Périodiques; Conception technique -- Périodiques; Electronic journals; 620.11
• DOI: 10.1016/j.matdes.2015.01.002
• Languages: English
• ISSNs: 0264-1275

Abstract

Highlights: ZrB2 promoted the densification of B4 C based ceramics during hot pressing. The Vickers hardness, flexural strength and fracture toughness were analyzed. BZ3 ceramic had the best thermal shock resistance for engineering applications. Abstract: B4 C–ZrB2 ceramics with different ZrB2 contents were fabricated using hot-pressing technique. The introduction of ZrB2 greatly promotes the sintering process, and all B4 C–ZrB2 samples achieve full densification. With the ZrB2 content increasing from 10 to 40 vol.%, the Vickers hardness ranges from 28.8 to 34.6 GPa, the flexure strength ranges from 233.3 to 523.4 MPa, and the fracture toughness ranges from 6.0 to 7.0 MPa m 1/2, respectively. The thermal shock properties of B4 C–ZrB2 ceramics were also investigated using water quenching method. The critical thermal shock temperature difference (Δ Tc ) for B4 C–10 vol.% ZrB2, B4 C–20 vol.% ZrB2, B4 C–30 vol.% ZrB2 and B4 C–40 vol.% ZrB2 ceramics are 293.5, 337.5, 365.4 and 373.5 °C, respectively. Considering the ceramic should maintain a relatively high initial strength, B4 C–30 vol.% ZrB2 is found to exhibit the optimal thermal shock behavior.