Abstract
Monolithic B4C ceramics and B4C-CNT composites were prepared by spark plasma sintering (SPS). The influence of particle size, heating rate, and CNT addition on sintering behavior, microstructure and mechanical properties were studied. Two different B4C powders were used to examine the effect of particle size. The effect of heating rate on monolithic B4C was investigated by applying three different heating rates (75, 150 and 225 °C/min). Moreover, in order to evaluate the effect of CNT addition, B4C-CNT (0.5-3 mass%) composites were also produced. Fully dense monolithic B4C ceramics were obtained by using heating rate of 75 °C/min. Vickers hardness value increased with increasing CNT content, and B4C-CNT composite with 3 mass% CNTs had the highest hardness value of 32.8 GPa. Addition of CNTs and increase in heating rate had a positive effect on the fracture toughness and the highest fracture toughness value, 5.9 MPa m1/2, was achieved in composite with 3 mass% CNTs.
| Original language | English |
|---|---|
| Pages (from-to) | 8936-8944 |
| Number of pages | 9 |
| Journal | Ceramics International |
| Volume | 41 |
| Issue number | 7 |
| DOIs | |
| Publication status | Published - 1 Aug 2015 |
Bibliographical note
Publisher Copyright:© 2015 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
Funding
This work was partially supported by Ministry of Science, Industry and Technology, Industrial Thesis (SANTEZ) programme (Project number: STZ.946.2011-2 ) and Scientific Research Project Funds of Istanbul Technical University (Project number: 37130 ). The authors thank H. Dincer for his contribution in SPS studies, H. H. Sezer and T. T. Alpak for SEM studies.
| Funders | Funder number |
|---|---|
| Ministry of Science, Industry and Technology, Industrial Thesis | |
| SANTEZ | STZ.946.2011-2 |
| Istanbul Teknik Üniversitesi | 37130 |
Keywords
- BC
- CNT
- Fracture toughness
- Spark plasma sintering