Effect of Composite Sintering Aids on the Thermal and Mechanical Properties of Hot-Pressed Aluminum Nitride

Abstract:

The aim of this work was to determine the effect of composite additives on the thermal and mechanical properties of aluminum nitride (AlN) in detail. The composite system has not been studied in depth before. The hot-pressed AlN was prepared with Y₂O₃-Dy₂O₃-YF₃ and Y₂O₃-Dy₂O₃-CaO as the composite sintering additives. As the result, the thermal conductivities for the sintered body with two composite additives were 171 W/m.K and 152 W/m.K, respectively. The fracture toughness values calculated by the Evans & Clarkes’s equation for both of the samples were 2.34±0.09 MPa.m^1/2and 2.63±0.13 MPa.m^1/2 at 10 kg load. The toughness difference is the result of comprehensive effect of the grain size, the properties of the boundary phase, its distribution, and also the interactions between different phases.

• Periodical: Key Engineering Materials (Volumes 602-603)
• Pages: 561-564
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.602-603.561
• Online since: March 2014
• Authors: Jun Yu Fu, Shang Hua Wu, Yan Ling Cheng*, Chang Lu Fu, Ruo Jun Wu, Zhong Yong Lu
• Keywords: Aluminum Nitride (AlN), Composite Additives, Fracture Toughness, Hot-Pressed

References

[1] G.A. Slack, Nonmetallic crystals with high thermal conductivity, J. Phys. Chem. Solids. 34 (1973) 321-325.

[2] L.M. Sheppard, Aluminum nitride: a versatile but challenging material，Am. Ceram. Bull. 69 (1990) 1801-1803.

[3] G.A. Slack, R.A. Tanzilli, R.O. Pholand, J.W. Vandersande, The intrinsic thermal conductivity of AlN, J. phys. Chem. Solids 48 (1987) 641-647.

DOI: 10.1016/0022-3697(87)90153-3

[4] Pedro Sainz de Baranda, Arne K. Knudsen, Edwin Ruh, Effect of yttria on the thermal conductivity of Aluminum Nitride, J. Am. Ceram. Soc. 77 (1994) 1846-1850.

DOI: 10.1111/j.1151-2916.1994.tb07060.x

[5] Ran-Rong Lee, Development of high thermal conductivity Aluminum Nitride ceramic, J. Am. Ceram. Soc. 74 (1991) 2242-2249.

[6] Y. Kurokawa, H. Hamgauchi, Y. Shimada, Development of highly thermal conductivity AlN substrate by Green Sheet Technology, Proc. IEEE. 74 (1986) 412-418.

[7] G.M. Gross, H.J. Seifert, F. Aldinger, Thermodynamic Assessment and Experimental Check of Fluoride Sintering Aids for AlN, Journal of the European Society. 18 (1998) 871-877.

DOI: 10.1016/s0955-2219(97)00175-1

[8] Koji Watari, M.E. Brito, M. Toriyama, S. Kanzaki, Low-Temperature sintering and high thermal conductivity of YLiO2-Doped AlN Ceramics, J. Am. Ceram. Soc. 79 (1996) 1979-(1981).

DOI: 10.1111/j.1151-2916.1996.tb08024.x

[9] Liang Qiao, Heping Zhou, Kexin Chen, Renli Fu, Effect of Li2O on the low temperature sintering and thermal conductivity of AlN ceramics, Journal of the European Ceramic Society. 23 (2003) 1517-1524.

DOI: 10.1016/s0955-2219(02)00344-8

[10] Xueli Du, Mingli Qin, Akhtar Farid, Islam S. Humail, Xuanhui Qu, Study of rare-earth oxide sintering aid systems for AlN ceramics, Materials Science and Engineering A . 460-461 (2007) 471-474.

DOI: 10.1016/j.msea.2007.01.137

[11] T. Barrett Jackson, Anil V. Virkar, Karren L. More, High-Thermal-Conductivity Aluminum Nitride Ceramics: The Effect of Thermodynamic, Kinetic and Microstructural Factors, J. Am. Ceram. Sco. 80 (1997) 1421-1435.

DOI: 10.1111/j.1151-2916.1997.tb03000.x

[12] Anil V. Virkar, T. Barrett Jackson, Raymond A. Culter, Thermodynamic and kinetic effects of oxygen removal on the thermal conductivity of Aluminum Nitride, J. Am. Ceram. Soc. 72 (1989) 2031-(2042).

DOI: 10.1111/j.1151-2916.1989.tb06027.x

[13] Liang Qiao, Heping Zhou, Renli Fu, Thermal Conductivity of AlN ceramics sintered with CaF2 and YF3, Ceramics International. 29 (2003) 893-896.

DOI: 10.1016/s0272-8842(03)00033-6

[14] A.G. Evans, E.A. Charles, Fracture Toughness Determination by Indentation, J. Am. Ceram. Soc. 59 (1976).

[15] Pedro Sainz de Baranda, Arne K. Knudsen, Edwin Ruh, Effect of CaO on the thermal conductivity of Aluminum Nitride, J. Am. Ceram. Soc. 76 (1993) 1751-1760.

DOI: 10.1111/j.1151-2916.1993.tb06644.x

[16] K.T. Faber, A.G. Evans, Crack Deflection Processes—I. Theory, Acta Metall. 31 (1983) 565-576.

DOI: 10.1016/0001-6160(83)90046-9