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Y. Li et al. /Materials Research Bulletin 37(2002)1401-1409 1409 large aspect ratio of h-bn grains and the fine microstructure owing to inhibition of matrix Al2O3 grain growth by nano-sized h-Bn dispersions ()The observed excellent machinability derived from the cleavage of the h-BN crystals beneath the cutting tools, and the weak interfaces between Al2O matrix and the h-Bn were caused by thermal expansion mismatch. The machinability of the materials maybe also connected with the decrease of Vickers hardness Acknowledgments The authors wish to thank the National Natural Science Foundation of China(No 50072017) for financial support and the State Key Laboratory for Mechanical Behavior of Materials for their technical support. References [1] G Launay, G. Brayet, F. Thevenot, J Mater. Sci. Lett. 5(1986)940 [2] Y.L. Li, G. Qiao, Z Jin, J Inorg. Mater. 16(2)(2001)207, (in Chinese) [3] T. Uno, T Kasuga, S Nakayama, A.J. Ikushima, J. Am. Ceram Soc. 76(2)(1993)539. [4] M.W. Baroum, T El-Raghy, J. Am. Ceram Soc. 79(7)(1996)1953 [5]K Suganuma, G. Sasaki, T. Fujuta, M. Okumura, K. Niihara, J. Mater. Sci. 28(1993)1175 6 T Kusunose, K Niihara, Chem Ind 51(8)(1998)1221, (in Japanese) [7] T. Kusunose, Y.H. Choa, T. Sekino, K Niihara, Ceram. Trans.: Innovative Proc /Synth. Ceram, Glasses, Composites Il(1999)443 [8] R.T. Paine, C K Narula, Chem. Rev. 90(1)(1990)73 [9] Z.H. Jin, J.Q. Gao, GJ. Qiao, Engineering Ceramic Materials, Xi'an Jiaotong University Press, Xian, 2000, 198-202 pp (in Chinese). [11 T. Kusunose, Newly Developed Silicon Nitride Based Nanocomposites with Multiple Functionality, Doctor Thesis, Osaka University, 1999, p. 55(in Japanese). [12] W.S. Coblenz, D. Lewis Ill, J. Am. Ceram Soc. 71(12)(1988)1080. [13] D. Lewis, R. P Ingel, WJ. McDonough, R w. Rice, Ceram. Eng. Sci. Proc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