焼結過程での反応で生成したFe_5Si_3粒子分散Si_3N_4の摺動及び機械的性質

概要

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Aiming at the development of Si_3N_4 based ceramics with low frictional coefficient, Fe_5Si_3-particles-dispersed Si_3N_4 ceramics were fabricated from a mixture of powders containing Fe_3O_4, Si_3N_4 and sintering additives. Microstructure, frictional and mechanical properties were investigated of the obtained ceramics, and it was confirmed that Fe_3O_4 consumed and granular Fe_5Si_3 phase generated with in the Si_3N_4 matrix by the reaction of Fe_3O_4 with other components during sintering. Sintered bodies were densified and high strength of 900 MPa was obtained, when the amount of Fe_3O_4 addition was less than 10 mass%. Whereas Fe_3O_4 addition exceeded 20 mass%, the strength fell off remarkably due to agglomerated Fe_5Si_3 and big pores. Moreover,the 10 mass% Fe_3O_4 added Si_3N_4 showed the lowest frictional coefficient. According to data of heat of immersion and contact angle measurement, this result was interpreted as being provided by the lubricant film formed on the ceramic surface.
社団法人日本セラミックス協会の論文
2002-10-01