A novel in situ synthesis of SiBCN-Zr composites prepared by a sol-gel process and spark plasma sintering

Yang Miao, Zhihua Yang, Bin Liang, Quan Li, Qingqing Chen, Dechang Jia, Yi Bing Cheng, Yu Zhou

Research output: Contribution to journalArticleResearchpeer-review

6 Citations (Scopus)

Abstract

In the work reported here, SiBCN amorphous powders were first prepared by a mechanical alloying technique, employing cubic silicon, graphite and hexagonal boron nitride powders as raw materials. Zirconia was then introduced via sol-gel methods. The resulting powder composite was then consolidated via SPS sintering. The SPS sintering sample was evaluated using XRD, SEM and TEM. XRD reveals a chemical transformation wherein amorphous BN(C) and ZrO2 form the primary ZrC and ZrB2 phases after SPS processing along with SiC and BN(C). Thereafter ZrC reacts with BN(C) completely to form ZrB2. The reaction starts at the temperature of 1500 °C and is complete at the temperature of 1900 °C. The fracture toughness of the sintered composites reaches 4.9 ± 0.2 MPa m1/2 due to the presence of the laminated structure of the BN(C) phase.

Original languageEnglish
Pages (from-to)12739-12744
Number of pages6
JournalDalton Transactions
Volume45
Issue number32
DOIs
Publication statusPublished - 2016

Cite this