Toughening Effect of ZrB_2 in Al_2O_3-ZrB_2 Nanocomposite Ceramics
Wang Xiaomin1; La Peiqing1; Wang Bingjun2; Yang Guolai1
Source Publication稀有金属材料与工程
AbstractThe Al_2O_3-ZrB_2 nanocomposite ceramics were prepared and the mechanical properties of the process parameters effect were studied. The results show that for various applied sintering temperatures of Al_2O_3 ceramics, a maximum Vickers hardness of 18 970 MPa and high reliability are attained at 1500 °C and at atmosphere sintering. The fracture toughness is (5.20.3) MPa·m~(1/2). In addition, the sample is not well densified at the sintering temperature. Scanning electron microscopy (SEM) shows that fine ZrB_2 particles disperse and are pinned at grain boundaries to inhibit grain boundary movement effectively. While larger ZrB_2 particles distribute between A1_2O_3 particles uniformly and occupy Al_2O_3 particles growing space to hinder the matrix grains, which greatly promote the densification of the ceramic and improve the microstructure. 20% ZrB_2/Al_2O_3 composite ceramics exhibit a relative density above 98% at (450 °C, Vickers hardness of 18 070 MPa, and fracture toughness of (6.70.2) MPa·m~(1/2) Fracture morphology indicates that trans-granular fracture occurs in the nanocomposite ceramic with high toughness.
Keywordatmospheric sintering nano alumina ceramic nanocomposite ceramics toughening
Indexed ByCSCD
WOS Research AreaEngineering
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Document Type期刊论文
Affiliation1.Lanzhou University of Technology, State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou, Gansu 730050, China
2.Qinghai University, Xining, Qinghai 810016, China
First Author AffilicationLanzhou University of Technology
First Signature AffilicationLanzhou University of Technology
Recommended Citation
GB/T 7714
Wang Xiaomin,La Peiqing,Wang Bingjun,et al. Toughening Effect of ZrB_2 in Al_2O_3-ZrB_2 Nanocomposite Ceramics[J]. 稀有金属材料与工程,2016,45(7):1714-1718.
APA Wang Xiaomin,La Peiqing,Wang Bingjun,&Yang Guolai.(2016).Toughening Effect of ZrB_2 in Al_2O_3-ZrB_2 Nanocomposite Ceramics.稀有金属材料与工程,45(7),1714-1718.
MLA Wang Xiaomin,et al."Toughening Effect of ZrB_2 in Al_2O_3-ZrB_2 Nanocomposite Ceramics".稀有金属材料与工程 45.7(2016):1714-1718.
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