D. Liet al. Ceramics International 30(2004)213-217 4. Conclusion [6 H. Katsuki, Y. Hirata, Coat of alumina sheet with needle-like mullite, J Ceram Soc. Jpn. 98(1990)1114-1119 The fracture behavior of LSB was quite different from [7 J. She. T. Inoue, K. Ueno. Multilayer Al203/SiC ceramics wit hat of MS. Ms fractured catastrophically, while LSB S roved mechanical behavior, Ceram. Int. 20(2000)1771- showed a non-catastrophic failure behavior. Due to the [8 N.P. Padture, D.C. Pender, S. Wuttiphan, B.R. Lawn, In situ deflection, branching and delamination of the transverse processing of silicon carbide layer structures. J. Am. Ceram Soc cracks at the Sic/Bn interfaces, the indentation 78(11)(1995)3160-3162. strengths of LSB were observed to be insensitive to the [9 W.J. Clegg, K. Kendall, N.M. Alford, A simple way to make increases in the indentation load. indicative of excellent tough ceramics, Nature(London)347(1990)455-461 [0 w.J. Clegg, The fabrication and failure of laminar ceramic com- damage resistance, compared with Ms. Furthermore, a posites. Acta Metall. Mater. 40(11)(1992)3085-3093 rising R-curve behavior was demonstrated from ISB test. [11] H Liu, B.R. Lawn, S M. Hsu, Hertzian contact response of tailored silicon nitride multilayers, J Am Ceram Soc. 79(4)(1996)1009 [12 H. Liu, S.M. Hsu, Fracture behavior of multilayer silicon nitrid boron nitride ceramics, J. Am. Ceram. Soc. 79(9)(1996)2452- Acknowledgements [ T Ohji, Y Shigeaki, T Miyaji The authors wish to acknowledge State Key labora of multilayered silicon nitride, J. Am. Ceram. Soc. 80(4)(1997) tory for Mechanical Behavior of Materials for financial 991-994. nd technical support [14 GJ. Yuan, Y.M. Luo, D M. Chen, Selection of interfacial layer of laminated silicon carbide matrix composites, J. Chinese Ceram Soc. 29(3)(2001)226-231(in Chinese) [5 F. Rebillat, A. Guette, L. Espitalier, Oxidation resistance of References nly crystallised Bn interphase, J. Eur. Ceram Soc. 18(1998)1809-1819. [P Sarkar, X. Haung, P.S. Nicholson, Structural ceramic [16 S K. Lee, S. Wuttiphan, C.J. Fairbanks, Role of microstructure- minates by electrophoretic deposition, J. Am. Ceram Soc. strength properties in ceramics: I, effect of crack size on toug es,J.Am. Ceram.Soc.80(9)(1997)2367-2381 []D B. Marshall, J.J. Ratto, F.F. Lange, Enhanc [7R F. Cook, Direct observation and analysis of indentation toughness in layered microcomposites of Ce-ZrO2 and AlO3, acking in glass and ceramics, J. Am. Ceram Soc. 73(1990) J.Am. Ceram.Soc.74(12)(1991)29792987. 3J. Requena, R Moreno, J.S. Moya, Alumina and alumina/zirco- [18]GT. Antis, A critical evaluation of indentation techniques for ia multilayer composites obtained by slip casting, J. Am. Ceram. neasuring fracture toughness-direct crack measurements. J. Am Soc.72(8)(1989)151l-1513 Ceram.Soc.64(2)(1981)533 (K.P. Plucknett, C.H. Caceres, C. Hughers, D.S. Wilkinson, Pro- [19] D B. Marshall, T Noma, A.G. Evans, A simple method for deter cessing of tape-cast laminates prepared from fine alumina/zir ning elastic-modulus-to-hardness ratios using Knoop indenta nia powders, J Am Ceram Soc. 77(8)(1994)2145-2153 n measurements, J Am Ceram Soc. 65(10)(1982)175-176. 5C. Russo, M.P. Harmer, H M. Chan, G.A. Miller, Design of [20]R F. Cook, Microstructure-strength properties in ceramics: e laminated of crack size on toughness, J. Am. Ceram. Soc. 68(11)(1 ness,J.Am. Ceram.Soc.75(12)(1992)3396-3400 604615.4. Conclusion The fracture behavior of LSB was quite different from that of MS. MS fractured catastrophically, while LSB showed a non-catastrophic failure behavior. Due to the deflection, branching and delamination of the transverse cracks at the SiC/BN interfaces, the indentation strengths of LSB were observed to be insensitive to the increases in the indentation load, indicative of excellent damage resistance, compared with MS. Furthermore, a rising R-curve behavior was demonstrated from ISB test. Acknowledgements The authors wish to acknowledge State Key Labora￾tory for Mechanical Behavior of Materials for financial and technical support. References [1] P. Sarkar, X. Haung, P.S. Nicholson, Structural ceramic micro￾laminates by electrophoretic deposition, J. Am. Ceram. Soc. 75 (10) (1992) 2907–2909. [2] D.B. Marshall, J.J. Ratto, F.F. Lange, Enhanced fracture toughness in layered microcomposites of Ce-ZrO2 and Al2O3, J. Am. Ceram. Soc. 74 (12) (1991) 2979–2987. [3] J. Requena, R. Moreno, J.S. Moya, Alumina and alumina/zirco￾nia multilayer composites obtained by slip casting, J. Am. Ceram. Soc. 72 (8) (1989) 1511–1513. [4] K.P. Plucknett, C.H. Caceres, C. Hughers, D.S. Wilkinson, Pro￾cessing of tape-cast laminates prepared from fine alumina/zirco￾nia powders, J. Am. Ceram. Soc. 77 (8) (1994) 2145–2153. [5] C.J. Russo, M.P. Harmer, H.M. Chan, G.A. Miller, Design of laminated ceramic composite for improved strength and tough￾ness, J. Am. Ceram. Soc. 75 (12) (1992) 3396–3400. [6] H. Katsuki, Y. Hirata, Coat of alumina sheet with needle-like mullite, J. Ceram. Soc. Jpn. 98 (1990) 1114–1119. [7] J. She, T. Inoue, K. Ueno, Multilayer Al2O3/SiC ceramics with improved mechanical behavior, Ceram. Int. 20 (2000) 1771– 1775. [8] N.P. Padture, D.C. Pender, S. Wuttiphan, B.R. Lawn, In situ processing of silicon carbide layer structures, J. Am. Ceram. Soc. 78 (11) (1995) 3160–3162. [9] W.J. Clegg, K. Kendall, N.M. Alford, A simple way to make tough ceramics, Nature (London) 347 (1990) 455–461. [10] W.J. Clegg, The fabrication and failure of laminar ceramic com￾posites, Acta Metall. Mater. 40 (11) (1992) 3085–3093. [11] H. Liu, B.R. Lawn, S.M. Hsu, Hertzian contact response of tailored silicon nitride multilayers, J. Am. Ceram. Soc. 79 (4) (1996) 1009. [12] H. Liu, S.M. Hsu, Fracture behavior of multilayer silicon nitride/ boron nitride ceramics, J. Am. Ceram. Soc. 79 (9) (1996) 2452– 2457. [13] T. Ohji, Y. Shigegaki, T. Miyajima, Fracture resistance behavior of multilayered silicon nitride, J. Am. Ceram. Soc. 80 (4) (1997) 991–994. [14] G.J. Yuan, Y.M. Luo, D.M. Chen, Selection of interfacial layer of laminated silicon carbide matrix composites, J. Chinese Ceram. Soc. 29 (3) (2001) 226–231 (in Chinese). [15] F. Rebillat, A. Guette, L. Espitalier, Oxidation resistance of SiC/SiC micro and minicomposites with a highly crystallised Bn interphase, J. Eur. Ceram. Soc. 18 (1998) 1809–1819. [16] S.K. Lee, S. Wuttiphan, C.J. Fairbanks, Role of microstructure￾strength properties in ceramics: I, effect of crack size on tough￾ness, J. Am. Ceram. Soc. 80 (9) (1997) 2367–2381. [17] R.F. 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