Spark Plasma Sintering of ZrB2-SiC-Based Ceramics Reinforced with Nano-Diamond

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Shahedi Asl Mehdi; Ahmadi Zohre

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Journal: JOURNAL OF ADVANCED MATERIALS AND TECHNOLOGIES Year:2019 | Volume:7 | Issue:4 Page(s): 59-73

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Title

Spark Plasma Sintering of ZrB2-SiC-Based Ceramics Reinforced with Nano-Diamond

Author(s)

Shahedi Asl Mehdi | Ahmadi Zohre | Issue Writer Certificate

Keywords

Spark plasma sinteringQ1

Zirconium diborideQ1

Silicon carbideQ2

Nano-diamondQ1

CharacterizationQ2

Abstract

In this research work, the effects of Nano-diamond addition on densification and mechanical properties of 25 vol% SiC reinforced ZrB2-based ultra-high temperature composites were studied. In this way, a ZrB2– SiC composite (as the baseline) and three ZrB2– SiC-based composites doped with different amounts of Nano-diamond additive (1, 2 and 3 wt% of matrix phase) were fabricated by Spark plasma sintering route. The sintering process was carried out at 1900 ° C for 7 min under 40 MPa. The addition of Nano-diamond, up to 2 wt%, has not significantly affected the densification process because the 0-2 wt% Nano-diamond reinforced samples reached their theoretical densities but the relative density of sample reinforced with 3 wt% diamond was less than 99%. The hardness of 0, 1, 2 and 3 wt% diamond reinforced ceramics were 19. 5, 23. 4, 24. 7 and 22. 2 GPa, respectively. All diamond reinforced samples were harder than the diamondfree one but the hardness slightly decreased by the addition of 3 wt% diamond. The fracture toughness linearly increased from 4. 3 MPa. m1/2 for diamond-free ceramic to 5. 8 MPa. m1/2 for3 wt% diamond reinforced sample. The sintering route was a reactive process as the Nano-diamond was transformed to the graphite during the sintering and/or converted to the in-situ formed ZrC and B4C phases through the removal of oxide impurities from the surfaces of raw materials.

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APA: Copy

Shahedi Asl, Mehdi, & Ahmadi, Zohre. (2019). Spark Plasma Sintering of ZrB2-SiC-Based Ceramics Reinforced with Nano-Diamond. JOURNAL OF ADVANCED MATERIALS AND TECHNOLOGIES, 7(4 ), 59-73. SID. https://sid.ir/paper/252451/en

Vancouver: Copy

Shahedi Asl Mehdi, Ahmadi Zohre. Spark Plasma Sintering of ZrB2-SiC-Based Ceramics Reinforced with Nano-Diamond. JOURNAL OF ADVANCED MATERIALS AND TECHNOLOGIES[Internet]. 2019;7(4 ):59-73. Available from: https://sid.ir/paper/252451/en

IEEE: Copy

Mehdi Shahedi Asl, and Zohre Ahmadi, “Spark Plasma Sintering of ZrB2-SiC-Based Ceramics Reinforced with Nano-Diamond,” JOURNAL OF ADVANCED MATERIALS AND TECHNOLOGIES, vol. 7, no. 4 , pp. 59–73, 2019, [Online]. Available: https://sid.ir/paper/252451/en

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