Microstructure and Properties of Porous CMCs Prepared by HIPing the Pyrolyzed ZrO₂/ Si / Phenol Resin Composite

Abstract:

A novel two-step process was used to investigate the microstructure and properties of porous CMCs prepared by HIPing the pyrolyzed composites of commercially available ZrO2 (TZ- 3YS), silicon powders and phenolic resin. In the first step, preforms with 70, 80 and 90 mass % of ZrO2 powders were prepared by the pyrolysis of ZrO2 / Si / Phenol Resin composites at 850 oC in vacuum. And, then the pyrolyzed preforms were HIPed at 1400 oC for 30 minutes in Argon atmosphere under a pressure of 50 MPa to fabricate the porous CMCs, in the second step. XRD analyses suggested the formation of β-SiC in the composites below the melting point of silicon. SEM photographs showed that spherical pores of several μm in diameter were uniformly distributed in the matrices of composites and crystals of β-SiC with facets were observed in the pores. EDS analyses showed that the crystals were composed of Si and C with 1 : 1 atomic ratio suggesting that crystal are SiC. The maximum hardness (13.78 GPa) was achieved from the composite with 90 mass % ZrO2, which is more than that of bulk hardness of ZrO2 (10-12 GPa).

• Periodical: Materials Science Forum (Volumes 561-565)
• Pages: 747-750
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.561-565.747
• Online since: October 2007
• Authors: Muhammad Akhtar Sharif, Hidekazu Sueyoshi
• Keywords: Ceramic Matrix Composite (CMC), Hot Isostatic Pressing (HIP), Microstructure, Vickers Microhardness, β-SiC

References

[1] Byong-Taek Lee, Rajat Kanti Paul, Chi-Woo Lee and Hai-Doo Kim: Materials Letters Vol. 61.

[11] (2007), p.2182.

[2] Muhammad Akhtar Sharif, Yuzo Nakamura and Hidekazu Sueyoshi: Transactions of the Materials Research Society of Japan, Vol. 31.

[4] (2006), p.845.

[3] Asit Kumar Gain, Jae-Kil Han, Hee-Dong Jang and Byong-Taek Lee: Surface and Coating Technology Vol. 201.

[3] (2006), p.519.

[4] Toshihiro Isobe, Takahiro Tomita, Yoshikazu Kameshima, Akira Nakajima and Kiyoshi Okada: Journal of the European Ceramic Society Vol. 26.

[6] (2006), p.957.

[5] Sumin Zhu, Shuqiang Ding, Hong'an Xi, Qin Li and Ruoding Wang: Ceramics International Vol. 33.

[1] (2007), p.115.

[6] Carmen Galassi: Journal of the European Ceramic Society Vol. 26.

[14] (2006), p.2951.

[7] Noriko Bamaba, Yong-Ho Choa, Tohru Sekino and Koichi Nihara: Journal of the European Ceramic Society Vol. 23 (2003), p.773.

[8] P. Mogilevsky and A. Zangvil: Materials science and engineering A Vol. 262.

[1] (1999), p.16.

[9] Guo-Qiang Jin and Xiang-Yun Guo: Microporous and Mesoporous Materials Vol. 60[1-3] (2003), p.207.

[10] K. A. Trick and T. E. Saliba: Carbon Vol. 33.

[11] (1995), p.1509.

[11] Limin Shi, Hongsheng Zhao, Yinghui Yan, Ziqiang Li and Chunhe Tang: Powder Technology Vol. 169.

[2] (2006), p.71.

[12] Marco Antônio Schiavon, Eduardo Radovanovic and Inez Valéria Pagotto Yoshida: Powder Technolog Vol. 123[2-3] (2002), p.232.